Add xz decompression support
This adds xz decompression support from the kernel. Both compressing the barebox binary with xz and decompressing xz files on the commandline is supported. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
parent
2f81d316d2
commit
ccb2816477
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@ -582,6 +582,7 @@ choice
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prompt "default compression for in-barebox binaries"
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prompt "default compression for in-barebox binaries"
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default DEFAULT_COMPRESSION_NONE if PBL_IMAGE
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default DEFAULT_COMPRESSION_NONE if PBL_IMAGE
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default DEFAULT_COMPRESSION_LZO if LZO_DECOMPRESS
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default DEFAULT_COMPRESSION_LZO if LZO_DECOMPRESS
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default DEFAULT_COMPRESSION_XZ if XZ_DECOMPRESS
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default DEFAULT_COMPRESSION_GZIP if ZLIB
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default DEFAULT_COMPRESSION_GZIP if ZLIB
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default DEFAULT_COMPRESSION_LZ4 if LZ4_DECOMPRESS
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default DEFAULT_COMPRESSION_LZ4 if LZ4_DECOMPRESS
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default DEFAULT_COMPRESSION_BZIP2 if BZLIB
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default DEFAULT_COMPRESSION_BZIP2 if BZLIB
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@ -606,6 +607,10 @@ config DEFAULT_COMPRESSION_LZ4
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bool "lz4"
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bool "lz4"
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depends on LZ4_DECOMPRESS
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depends on LZ4_DECOMPRESS
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config DEFAULT_COMPRESSION_XZ
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bool "xz"
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depends on XZ_DECOMPRESS
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config DEFAULT_COMPRESSION_NONE
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config DEFAULT_COMPRESSION_NONE
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bool "no compression"
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bool "no compression"
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@ -82,6 +82,7 @@ $(obj)/%.s: $(obj)/% FORCE
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suffix_$(CONFIG_IMAGE_COMPRESSION_GZIP) = gzip
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suffix_$(CONFIG_IMAGE_COMPRESSION_GZIP) = gzip
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZO) = lzo
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZO) = lzo
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZ4) = lz4
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZ4) = lz4
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suffix_$(CONFIG_IMAGE_COMPRESSION_XZKERN) = xzkern
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suffix_$(CONFIG_IMAGE_COMPRESSION_NONE) = shipped
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suffix_$(CONFIG_IMAGE_COMPRESSION_NONE) = shipped
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# barebox.z - compressed barebox binary
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# barebox.z - compressed barebox binary
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@ -0,0 +1,271 @@
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/*
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* XZ decompressor
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*
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* Authors: Lasse Collin <lasse.collin@tukaani.org>
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* Igor Pavlov <http://7-zip.org/>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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#ifndef XZ_H
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#define XZ_H
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#ifdef __KERNEL__
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# include <linux/stddef.h>
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# include <linux/types.h>
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#else
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# include <stddef.h>
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# include <stdint.h>
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#endif
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/* In Linux, this is used to make extern functions static when needed. */
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#ifndef XZ_EXTERN
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# define XZ_EXTERN extern
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#endif
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#ifndef STATIC
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#define STATIC
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#endif
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/**
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* enum xz_mode - Operation mode
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*
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* @XZ_SINGLE: Single-call mode. This uses less RAM than
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* than multi-call modes, because the LZMA2
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* dictionary doesn't need to be allocated as
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* part of the decoder state. All required data
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* structures are allocated at initialization,
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* so xz_dec_run() cannot return XZ_MEM_ERROR.
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* @XZ_PREALLOC: Multi-call mode with preallocated LZMA2
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* dictionary buffer. All data structures are
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* allocated at initialization, so xz_dec_run()
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* cannot return XZ_MEM_ERROR.
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* @XZ_DYNALLOC: Multi-call mode. The LZMA2 dictionary is
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* allocated once the required size has been
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* parsed from the stream headers. If the
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* allocation fails, xz_dec_run() will return
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* XZ_MEM_ERROR.
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*
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* It is possible to enable support only for a subset of the above
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* modes at compile time by defining XZ_DEC_SINGLE, XZ_DEC_PREALLOC,
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* or XZ_DEC_DYNALLOC. The xz_dec kernel module is always compiled
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* with support for all operation modes, but the preboot code may
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* be built with fewer features to minimize code size.
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*/
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enum xz_mode {
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XZ_SINGLE,
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XZ_PREALLOC,
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XZ_DYNALLOC
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};
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/**
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* enum xz_ret - Return codes
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* @XZ_OK: Everything is OK so far. More input or more
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* output space is required to continue. This
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* return code is possible only in multi-call mode
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* (XZ_PREALLOC or XZ_DYNALLOC).
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* @XZ_STREAM_END: Operation finished successfully.
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* @XZ_UNSUPPORTED_CHECK: Integrity check type is not supported. Decoding
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* is still possible in multi-call mode by simply
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* calling xz_dec_run() again.
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* Note that this return value is used only if
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* XZ_DEC_ANY_CHECK was defined at build time,
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* which is not used in the kernel. Unsupported
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* check types return XZ_OPTIONS_ERROR if
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* XZ_DEC_ANY_CHECK was not defined at build time.
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* @XZ_MEM_ERROR: Allocating memory failed. This return code is
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* possible only if the decoder was initialized
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* with XZ_DYNALLOC. The amount of memory that was
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* tried to be allocated was no more than the
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* dict_max argument given to xz_dec_init().
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* @XZ_MEMLIMIT_ERROR: A bigger LZMA2 dictionary would be needed than
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* allowed by the dict_max argument given to
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* xz_dec_init(). This return value is possible
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* only in multi-call mode (XZ_PREALLOC or
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* XZ_DYNALLOC); the single-call mode (XZ_SINGLE)
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* ignores the dict_max argument.
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* @XZ_FORMAT_ERROR: File format was not recognized (wrong magic
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* bytes).
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* @XZ_OPTIONS_ERROR: This implementation doesn't support the requested
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* compression options. In the decoder this means
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* that the header CRC32 matches, but the header
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* itself specifies something that we don't support.
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* @XZ_DATA_ERROR: Compressed data is corrupt.
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* @XZ_BUF_ERROR: Cannot make any progress. Details are slightly
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* different between multi-call and single-call
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* mode; more information below.
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*
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* In multi-call mode, XZ_BUF_ERROR is returned when two consecutive calls
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* to XZ code cannot consume any input and cannot produce any new output.
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* This happens when there is no new input available, or the output buffer
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* is full while at least one output byte is still pending. Assuming your
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* code is not buggy, you can get this error only when decoding a compressed
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* stream that is truncated or otherwise corrupt.
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*
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* In single-call mode, XZ_BUF_ERROR is returned only when the output buffer
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* is too small or the compressed input is corrupt in a way that makes the
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* decoder produce more output than the caller expected. When it is
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* (relatively) clear that the compressed input is truncated, XZ_DATA_ERROR
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* is used instead of XZ_BUF_ERROR.
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*/
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enum xz_ret {
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XZ_OK,
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XZ_STREAM_END,
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XZ_UNSUPPORTED_CHECK,
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XZ_MEM_ERROR,
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XZ_MEMLIMIT_ERROR,
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XZ_FORMAT_ERROR,
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XZ_OPTIONS_ERROR,
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XZ_DATA_ERROR,
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XZ_BUF_ERROR
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};
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/**
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* struct xz_buf - Passing input and output buffers to XZ code
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* @in: Beginning of the input buffer. This may be NULL if and only
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* if in_pos is equal to in_size.
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* @in_pos: Current position in the input buffer. This must not exceed
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* in_size.
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* @in_size: Size of the input buffer
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* @out: Beginning of the output buffer. This may be NULL if and only
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* if out_pos is equal to out_size.
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* @out_pos: Current position in the output buffer. This must not exceed
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* out_size.
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* @out_size: Size of the output buffer
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*
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* Only the contents of the output buffer from out[out_pos] onward, and
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* the variables in_pos and out_pos are modified by the XZ code.
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*/
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struct xz_buf {
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const uint8_t *in;
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size_t in_pos;
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size_t in_size;
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uint8_t *out;
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size_t out_pos;
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size_t out_size;
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};
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/**
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* struct xz_dec - Opaque type to hold the XZ decoder state
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*/
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struct xz_dec;
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/**
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* xz_dec_init() - Allocate and initialize a XZ decoder state
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* @mode: Operation mode
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* @dict_max: Maximum size of the LZMA2 dictionary (history buffer) for
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* multi-call decoding. This is ignored in single-call mode
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* (mode == XZ_SINGLE). LZMA2 dictionary is always 2^n bytes
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* or 2^n + 2^(n-1) bytes (the latter sizes are less common
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* in practice), so other values for dict_max don't make sense.
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* In the kernel, dictionary sizes of 64 KiB, 128 KiB, 256 KiB,
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* 512 KiB, and 1 MiB are probably the only reasonable values,
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* except for kernel and initramfs images where a bigger
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* dictionary can be fine and useful.
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*
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* Single-call mode (XZ_SINGLE): xz_dec_run() decodes the whole stream at
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* once. The caller must provide enough output space or the decoding will
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* fail. The output space is used as the dictionary buffer, which is why
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* there is no need to allocate the dictionary as part of the decoder's
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* internal state.
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*
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* Because the output buffer is used as the workspace, streams encoded using
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* a big dictionary are not a problem in single-call mode. It is enough that
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* the output buffer is big enough to hold the actual uncompressed data; it
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* can be smaller than the dictionary size stored in the stream headers.
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*
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* Multi-call mode with preallocated dictionary (XZ_PREALLOC): dict_max bytes
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* of memory is preallocated for the LZMA2 dictionary. This way there is no
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* risk that xz_dec_run() could run out of memory, since xz_dec_run() will
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* never allocate any memory. Instead, if the preallocated dictionary is too
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* small for decoding the given input stream, xz_dec_run() will return
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* XZ_MEMLIMIT_ERROR. Thus, it is important to know what kind of data will be
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* decoded to avoid allocating excessive amount of memory for the dictionary.
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*
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* Multi-call mode with dynamically allocated dictionary (XZ_DYNALLOC):
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* dict_max specifies the maximum allowed dictionary size that xz_dec_run()
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* may allocate once it has parsed the dictionary size from the stream
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* headers. This way excessive allocations can be avoided while still
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* limiting the maximum memory usage to a sane value to prevent running the
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* system out of memory when decompressing streams from untrusted sources.
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*
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* On success, xz_dec_init() returns a pointer to struct xz_dec, which is
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* ready to be used with xz_dec_run(). If memory allocation fails,
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* xz_dec_init() returns NULL.
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*/
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XZ_EXTERN struct xz_dec *xz_dec_init(enum xz_mode mode, uint32_t dict_max);
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/**
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* xz_dec_run() - Run the XZ decoder
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* @s: Decoder state allocated using xz_dec_init()
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* @b: Input and output buffers
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*
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* The possible return values depend on build options and operation mode.
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* See enum xz_ret for details.
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*
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* Note that if an error occurs in single-call mode (return value is not
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* XZ_STREAM_END), b->in_pos and b->out_pos are not modified and the
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* contents of the output buffer from b->out[b->out_pos] onward are
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* undefined. This is true even after XZ_BUF_ERROR, because with some filter
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* chains, there may be a second pass over the output buffer, and this pass
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* cannot be properly done if the output buffer is truncated. Thus, you
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* cannot give the single-call decoder a too small buffer and then expect to
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* get that amount valid data from the beginning of the stream. You must use
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* the multi-call decoder if you don't want to uncompress the whole stream.
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*/
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XZ_EXTERN enum xz_ret xz_dec_run(struct xz_dec *s, struct xz_buf *b);
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/**
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* xz_dec_reset() - Reset an already allocated decoder state
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* @s: Decoder state allocated using xz_dec_init()
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*
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* This function can be used to reset the multi-call decoder state without
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* freeing and reallocating memory with xz_dec_end() and xz_dec_init().
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*
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* In single-call mode, xz_dec_reset() is always called in the beginning of
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* xz_dec_run(). Thus, explicit call to xz_dec_reset() is useful only in
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* multi-call mode.
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*/
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XZ_EXTERN void xz_dec_reset(struct xz_dec *s);
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/**
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* xz_dec_end() - Free the memory allocated for the decoder state
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* @s: Decoder state allocated using xz_dec_init(). If s is NULL,
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* this function does nothing.
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*/
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XZ_EXTERN void xz_dec_end(struct xz_dec *s);
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/*
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* Standalone build (userspace build or in-kernel build for boot time use)
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* needs a CRC32 implementation. For normal in-kernel use, kernel's own
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* CRC32 module is used instead, and users of this module don't need to
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* care about the functions below.
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*/
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#ifndef XZ_INTERNAL_CRC32
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# define XZ_INTERNAL_CRC32 1
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#endif
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#if XZ_INTERNAL_CRC32
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/*
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* This must be called before any other xz_* function to initialize
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* the CRC32 lookup table.
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*/
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XZ_EXTERN void xz_crc32_init(void);
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/*
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* Update CRC32 value using the polynomial from IEEE-802.3. To start a new
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* calculation, the third argument must be zero. To continue the calculation,
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* the previously returned value is passed as the third argument.
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*/
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XZ_EXTERN uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc);
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#endif
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STATIC int decompress_unxz(unsigned char *in, long in_size,
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long (*fill)(void *dest, unsigned long size),
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long (*flush)(void *src, unsigned long size),
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unsigned char *out, long *in_used,
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void (*error)(char *x));
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#endif
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@ -18,6 +18,10 @@ config LZ4_DECOMPRESS
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bool "include lz4 uncompression support"
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bool "include lz4 uncompression support"
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select UNCOMPRESS
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select UNCOMPRESS
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config XZ_DECOMPRESS
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bool "include xz uncompression support"
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select UNCOMPRESS
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config GENERIC_FIND_NEXT_BIT
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config GENERIC_FIND_NEXT_BIT
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def_bool n
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def_bool n
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obj-y += math.o
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obj-y += math.o
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obj-$(CONFIG_BZLIB) += decompress_bunzip2.o
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obj-$(CONFIG_BZLIB) += decompress_bunzip2.o
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obj-$(CONFIG_ZLIB) += decompress_inflate.o zlib_inflate/
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obj-$(CONFIG_ZLIB) += decompress_inflate.o zlib_inflate/
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obj-$(CONFIG_XZ_DECOMPRESS) += decompress_unxz.o xz/
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obj-$(CONFIG_CMDLINE_EDITING) += readline.o
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obj-$(CONFIG_CMDLINE_EDITING) += readline.o
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obj-$(CONFIG_SIMPLE_READLINE) += readline_simple.o
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obj-$(CONFIG_SIMPLE_READLINE) += readline_simple.o
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obj-$(CONFIG_GLOB) += fnmatch.o
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obj-$(CONFIG_GLOB) += fnmatch.o
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@ -0,0 +1,376 @@
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/*
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* Wrapper for decompressing XZ-compressed kernel, initramfs, and initrd
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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/*
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* Important notes about in-place decompression
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*
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* At least on x86, the kernel is decompressed in place: the compressed data
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||||||
|
* is placed to the end of the output buffer, and the decompressor overwrites
|
||||||
|
* most of the compressed data. There must be enough safety margin to
|
||||||
|
* guarantee that the write position is always behind the read position.
|
||||||
|
*
|
||||||
|
* The safety margin for XZ with LZMA2 or BCJ+LZMA2 is calculated below.
|
||||||
|
* Note that the margin with XZ is bigger than with Deflate (gzip)!
|
||||||
|
*
|
||||||
|
* The worst case for in-place decompression is that the beginning of
|
||||||
|
* the file is compressed extremely well, and the rest of the file is
|
||||||
|
* uncompressible. Thus, we must look for worst-case expansion when the
|
||||||
|
* compressor is encoding uncompressible data.
|
||||||
|
*
|
||||||
|
* The structure of the .xz file in case of a compresed kernel is as follows.
|
||||||
|
* Sizes (as bytes) of the fields are in parenthesis.
|
||||||
|
*
|
||||||
|
* Stream Header (12)
|
||||||
|
* Block Header:
|
||||||
|
* Block Header (8-12)
|
||||||
|
* Compressed Data (N)
|
||||||
|
* Block Padding (0-3)
|
||||||
|
* CRC32 (4)
|
||||||
|
* Index (8-20)
|
||||||
|
* Stream Footer (12)
|
||||||
|
*
|
||||||
|
* Normally there is exactly one Block, but let's assume that there are
|
||||||
|
* 2-4 Blocks just in case. Because Stream Header and also Block Header
|
||||||
|
* of the first Block don't make the decompressor produce any uncompressed
|
||||||
|
* data, we can ignore them from our calculations. Block Headers of possible
|
||||||
|
* additional Blocks have to be taken into account still. With these
|
||||||
|
* assumptions, it is safe to assume that the total header overhead is
|
||||||
|
* less than 128 bytes.
|
||||||
|
*
|
||||||
|
* Compressed Data contains LZMA2 or BCJ+LZMA2 encoded data. Since BCJ
|
||||||
|
* doesn't change the size of the data, it is enough to calculate the
|
||||||
|
* safety margin for LZMA2.
|
||||||
|
*
|
||||||
|
* LZMA2 stores the data in chunks. Each chunk has a header whose size is
|
||||||
|
* a maximum of 6 bytes, but to get round 2^n numbers, let's assume that
|
||||||
|
* the maximum chunk header size is 8 bytes. After the chunk header, there
|
||||||
|
* may be up to 64 KiB of actual payload in the chunk. Often the payload is
|
||||||
|
* quite a bit smaller though; to be safe, let's assume that an average
|
||||||
|
* chunk has only 32 KiB of payload.
|
||||||
|
*
|
||||||
|
* The maximum uncompressed size of the payload is 2 MiB. The minimum
|
||||||
|
* uncompressed size of the payload is in practice never less than the
|
||||||
|
* payload size itself. The LZMA2 format would allow uncompressed size
|
||||||
|
* to be less than the payload size, but no sane compressor creates such
|
||||||
|
* files. LZMA2 supports storing uncompressible data in uncompressed form,
|
||||||
|
* so there's never a need to create payloads whose uncompressed size is
|
||||||
|
* smaller than the compressed size.
|
||||||
|
*
|
||||||
|
* The assumption, that the uncompressed size of the payload is never
|
||||||
|
* smaller than the payload itself, is valid only when talking about
|
||||||
|
* the payload as a whole. It is possible that the payload has parts where
|
||||||
|
* the decompressor consumes more input than it produces output. Calculating
|
||||||
|
* the worst case for this would be tricky. Instead of trying to do that,
|
||||||
|
* let's simply make sure that the decompressor never overwrites any bytes
|
||||||
|
* of the payload which it is currently reading.
|
||||||
|
*
|
||||||
|
* Now we have enough information to calculate the safety margin. We need
|
||||||
|
* - 128 bytes for the .xz file format headers;
|
||||||
|
* - 8 bytes per every 32 KiB of uncompressed size (one LZMA2 chunk header
|
||||||
|
* per chunk, each chunk having average payload size of 32 KiB); and
|
||||||
|
* - 64 KiB (biggest possible LZMA2 chunk payload size) to make sure that
|
||||||
|
* the decompressor never overwrites anything from the LZMA2 chunk
|
||||||
|
* payload it is currently reading.
|
||||||
|
*
|
||||||
|
* We get the following formula:
|
||||||
|
*
|
||||||
|
* safety_margin = 128 + uncompressed_size * 8 / 32768 + 65536
|
||||||
|
* = 128 + (uncompressed_size >> 12) + 65536
|
||||||
|
*
|
||||||
|
* For comparison, according to arch/x86/boot/compressed/misc.c, the
|
||||||
|
* equivalent formula for Deflate is this:
|
||||||
|
*
|
||||||
|
* safety_margin = 18 + (uncompressed_size >> 12) + 32768
|
||||||
|
*
|
||||||
|
* Thus, when updating Deflate-only in-place kernel decompressor to
|
||||||
|
* support XZ, the fixed overhead has to be increased from 18+32768 bytes
|
||||||
|
* to 128+65536 bytes.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* STATIC is defined to "static" if we are being built for kernel
|
||||||
|
* decompression (pre-boot code). <linux/decompress/mm.h> will define
|
||||||
|
* STATIC to empty if it wasn't already defined. Since we will need to
|
||||||
|
* know later if we are being used for kernel decompression, we define
|
||||||
|
* XZ_PREBOOT here.
|
||||||
|
*/
|
||||||
|
#ifdef STATIC
|
||||||
|
# define XZ_PREBOOT
|
||||||
|
#endif
|
||||||
|
#ifdef __KERNEL__
|
||||||
|
# include <linux/decompress/mm.h>
|
||||||
|
#endif
|
||||||
|
#define XZ_EXTERN STATIC
|
||||||
|
|
||||||
|
#ifndef XZ_PREBOOT
|
||||||
|
# include <malloc.h>
|
||||||
|
# include <linux/xz.h>
|
||||||
|
#else
|
||||||
|
/*
|
||||||
|
* Use the internal CRC32 code instead of kernel's CRC32 module, which
|
||||||
|
* is not available in early phase of booting.
|
||||||
|
*/
|
||||||
|
#define XZ_INTERNAL_CRC32 1
|
||||||
|
|
||||||
|
/*
|
||||||
|
* For boot time use, we enable only the BCJ filter of the current
|
||||||
|
* architecture or none if no BCJ filter is available for the architecture.
|
||||||
|
*/
|
||||||
|
#ifdef CONFIG_X86
|
||||||
|
# define XZ_DEC_X86
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_PPC
|
||||||
|
# define XZ_DEC_POWERPC
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_ARM
|
||||||
|
# define XZ_DEC_ARM
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_IA64
|
||||||
|
# define XZ_DEC_IA64
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_SPARC
|
||||||
|
# define XZ_DEC_SPARC
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This will get the basic headers so that memeq() and others
|
||||||
|
* can be defined.
|
||||||
|
*/
|
||||||
|
#include "xz/xz_private.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Replace the normal allocation functions with the versions from
|
||||||
|
* <linux/decompress/mm.h>. vfree() needs to support vfree(NULL)
|
||||||
|
* when XZ_DYNALLOC is used, but the pre-boot free() doesn't support it.
|
||||||
|
* Workaround it here because the other decompressors don't need it.
|
||||||
|
*/
|
||||||
|
#undef kmalloc
|
||||||
|
#undef kfree
|
||||||
|
#undef vmalloc
|
||||||
|
#undef vfree
|
||||||
|
#define kmalloc(size, flags) malloc(size)
|
||||||
|
#define kfree(ptr) free(ptr)
|
||||||
|
#define vmalloc(size) malloc(size)
|
||||||
|
#define vfree(ptr) do { if (ptr != NULL) free(ptr); } while (0)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* FIXME: Not all basic memory functions are provided in architecture-specific
|
||||||
|
* files (yet). We define our own versions here for now, but this should be
|
||||||
|
* only a temporary solution.
|
||||||
|
*
|
||||||
|
* memeq and memzero are not used much and any remotely sane implementation
|
||||||
|
* is fast enough. memcpy/memmove speed matters in multi-call mode, but
|
||||||
|
* the kernel image is decompressed in single-call mode, in which only
|
||||||
|
* memcpy speed can matter and only if there is a lot of uncompressible data
|
||||||
|
* (LZMA2 stores uncompressible chunks in uncompressed form). Thus, the
|
||||||
|
* functions below should just be kept small; it's probably not worth
|
||||||
|
* optimizing for speed.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef memeq
|
||||||
|
static bool memeq(const void *a, const void *b, size_t size)
|
||||||
|
{
|
||||||
|
const uint8_t *x = a;
|
||||||
|
const uint8_t *y = b;
|
||||||
|
size_t i;
|
||||||
|
|
||||||
|
for (i = 0; i < size; ++i)
|
||||||
|
if (x[i] != y[i])
|
||||||
|
return false;
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifndef memzero
|
||||||
|
static void memzero(void *buf, size_t size)
|
||||||
|
{
|
||||||
|
uint8_t *b = buf;
|
||||||
|
uint8_t *e = b + size;
|
||||||
|
|
||||||
|
while (b != e)
|
||||||
|
*b++ = '\0';
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Since we need memmove anyway, would use it as memcpy too.
|
||||||
|
* Commented out for now to avoid breaking things.
|
||||||
|
*/
|
||||||
|
/*
|
||||||
|
#ifndef memcpy
|
||||||
|
# define memcpy memmove
|
||||||
|
#endif
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "xz/xz_crc32.c"
|
||||||
|
#include "xz/xz_dec_stream.c"
|
||||||
|
#include "xz/xz_dec_lzma2.c"
|
||||||
|
#include "xz/xz_dec_bcj.c"
|
||||||
|
|
||||||
|
#endif /* XZ_PREBOOT */
|
||||||
|
|
||||||
|
/* Size of the input and output buffers in multi-call mode */
|
||||||
|
#define XZ_IOBUF_SIZE 4096
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This function implements the API defined in <linux/decompress/generic.h>.
|
||||||
|
*
|
||||||
|
* This wrapper will automatically choose single-call or multi-call mode
|
||||||
|
* of the native XZ decoder API. The single-call mode can be used only when
|
||||||
|
* both input and output buffers are available as a single chunk, i.e. when
|
||||||
|
* fill() and flush() won't be used.
|
||||||
|
*/
|
||||||
|
STATIC int decompress_unxz(unsigned char *in, long in_size,
|
||||||
|
long (*fill)(void *dest, unsigned long size),
|
||||||
|
long (*flush)(void *src, unsigned long size),
|
||||||
|
unsigned char *out, long *in_used,
|
||||||
|
void (*error)(char *x))
|
||||||
|
{
|
||||||
|
struct xz_buf b;
|
||||||
|
struct xz_dec *s;
|
||||||
|
enum xz_ret ret;
|
||||||
|
bool must_free_in = false;
|
||||||
|
|
||||||
|
#if XZ_INTERNAL_CRC32
|
||||||
|
xz_crc32_init();
|
||||||
|
#endif
|
||||||
|
|
||||||
|
if (in_used != NULL)
|
||||||
|
*in_used = 0;
|
||||||
|
|
||||||
|
if (fill == NULL && flush == NULL)
|
||||||
|
s = xz_dec_init(XZ_SINGLE, 0);
|
||||||
|
else
|
||||||
|
s = xz_dec_init(XZ_DYNALLOC, (uint32_t)-1);
|
||||||
|
|
||||||
|
if (s == NULL)
|
||||||
|
goto error_alloc_state;
|
||||||
|
|
||||||
|
if (flush == NULL) {
|
||||||
|
b.out = out;
|
||||||
|
b.out_size = (size_t)-1;
|
||||||
|
} else {
|
||||||
|
b.out_size = XZ_IOBUF_SIZE;
|
||||||
|
b.out = malloc(XZ_IOBUF_SIZE);
|
||||||
|
if (b.out == NULL)
|
||||||
|
goto error_alloc_out;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (in == NULL) {
|
||||||
|
must_free_in = true;
|
||||||
|
in = malloc(XZ_IOBUF_SIZE);
|
||||||
|
if (in == NULL)
|
||||||
|
goto error_alloc_in;
|
||||||
|
}
|
||||||
|
|
||||||
|
b.in = in;
|
||||||
|
b.in_pos = 0;
|
||||||
|
b.in_size = in_size;
|
||||||
|
b.out_pos = 0;
|
||||||
|
|
||||||
|
if (fill == NULL && flush == NULL) {
|
||||||
|
ret = xz_dec_run(s, &b);
|
||||||
|
} else {
|
||||||
|
do {
|
||||||
|
if (b.in_pos == b.in_size && fill != NULL) {
|
||||||
|
if (in_used != NULL)
|
||||||
|
*in_used += b.in_pos;
|
||||||
|
|
||||||
|
b.in_pos = 0;
|
||||||
|
|
||||||
|
in_size = fill(in, XZ_IOBUF_SIZE);
|
||||||
|
if (in_size < 0) {
|
||||||
|
/*
|
||||||
|
* This isn't an optimal error code
|
||||||
|
* but it probably isn't worth making
|
||||||
|
* a new one either.
|
||||||
|
*/
|
||||||
|
ret = XZ_BUF_ERROR;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
b.in_size = in_size;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = xz_dec_run(s, &b);
|
||||||
|
|
||||||
|
if (flush != NULL && (b.out_pos == b.out_size
|
||||||
|
|| (ret != XZ_OK && b.out_pos > 0))) {
|
||||||
|
/*
|
||||||
|
* Setting ret here may hide an error
|
||||||
|
* returned by xz_dec_run(), but probably
|
||||||
|
* it's not too bad.
|
||||||
|
*/
|
||||||
|
if (flush(b.out, b.out_pos) != (long)b.out_pos)
|
||||||
|
ret = XZ_BUF_ERROR;
|
||||||
|
|
||||||
|
b.out_pos = 0;
|
||||||
|
}
|
||||||
|
} while (ret == XZ_OK);
|
||||||
|
|
||||||
|
if (must_free_in)
|
||||||
|
free(in);
|
||||||
|
|
||||||
|
if (flush != NULL)
|
||||||
|
free(b.out);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (in_used != NULL)
|
||||||
|
*in_used += b.in_pos;
|
||||||
|
|
||||||
|
xz_dec_end(s);
|
||||||
|
|
||||||
|
switch (ret) {
|
||||||
|
case XZ_STREAM_END:
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
case XZ_MEM_ERROR:
|
||||||
|
/* This can occur only in multi-call mode. */
|
||||||
|
error("XZ decompressor ran out of memory");
|
||||||
|
break;
|
||||||
|
|
||||||
|
case XZ_FORMAT_ERROR:
|
||||||
|
error("Input is not in the XZ format (wrong magic bytes)");
|
||||||
|
break;
|
||||||
|
|
||||||
|
case XZ_OPTIONS_ERROR:
|
||||||
|
error("Input was encoded with settings that are not "
|
||||||
|
"supported by this XZ decoder");
|
||||||
|
break;
|
||||||
|
|
||||||
|
case XZ_DATA_ERROR:
|
||||||
|
case XZ_BUF_ERROR:
|
||||||
|
error("XZ-compressed data is corrupt");
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
error("Bug in the XZ decompressor");
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
error_alloc_in:
|
||||||
|
if (flush != NULL)
|
||||||
|
free(b.out);
|
||||||
|
|
||||||
|
error_alloc_out:
|
||||||
|
xz_dec_end(s);
|
||||||
|
|
||||||
|
error_alloc_state:
|
||||||
|
error("XZ decompressor ran out of memory");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This macro is used by architecture-specific files to decompress
|
||||||
|
* the kernel image.
|
||||||
|
*/
|
||||||
|
#define decompress decompress_unxz
|
|
@ -21,6 +21,7 @@
|
||||||
#include <bunzip2.h>
|
#include <bunzip2.h>
|
||||||
#include <gunzip.h>
|
#include <gunzip.h>
|
||||||
#include <lzo.h>
|
#include <lzo.h>
|
||||||
|
#include <linux/xz.h>
|
||||||
#include <linux/decompress/unlz4.h>
|
#include <linux/decompress/unlz4.h>
|
||||||
#include <errno.h>
|
#include <errno.h>
|
||||||
#include <filetype.h>
|
#include <filetype.h>
|
||||||
|
@ -117,6 +118,11 @@ int uncompress(unsigned char *inbuf, int len,
|
||||||
case filetype_lz4_compressed:
|
case filetype_lz4_compressed:
|
||||||
compfn = decompress_unlz4;
|
compfn = decompress_unlz4;
|
||||||
break;
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_XZ_DECOMPRESS
|
||||||
|
case filetype_xz_compressed:
|
||||||
|
compfn = decompress_unxz;
|
||||||
|
break;
|
||||||
#endif
|
#endif
|
||||||
default:
|
default:
|
||||||
err = asprintf("cannot handle filetype %s", file_type_to_string(ft));
|
err = asprintf("cannot handle filetype %s", file_type_to_string(ft));
|
||||||
|
|
|
@ -0,0 +1,2 @@
|
||||||
|
obj-$(CONFIG_XZ_DECOMPRESS) += xz_crc32.o xz_dec_bcj.o
|
||||||
|
obj-$(CONFIG_XZ_DECOMPRESS) += xz_dec_lzma2.o xz_dec_stream.o
|
|
@ -0,0 +1,59 @@
|
||||||
|
/*
|
||||||
|
* CRC32 using the polynomial from IEEE-802.3
|
||||||
|
*
|
||||||
|
* Authors: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
* Igor Pavlov <http://7-zip.org/>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This is not the fastest implementation, but it is pretty compact.
|
||||||
|
* The fastest versions of xz_crc32() on modern CPUs without hardware
|
||||||
|
* accelerated CRC instruction are 3-5 times as fast as this version,
|
||||||
|
* but they are bigger and use more memory for the lookup table.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "xz_private.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* STATIC_RW_DATA is used in the pre-boot environment on some architectures.
|
||||||
|
* See <linux/decompress/mm.h> for details.
|
||||||
|
*/
|
||||||
|
#ifndef STATIC_RW_DATA
|
||||||
|
# define STATIC_RW_DATA static
|
||||||
|
#endif
|
||||||
|
|
||||||
|
STATIC_RW_DATA uint32_t xz_crc32_table[256];
|
||||||
|
|
||||||
|
XZ_EXTERN void xz_crc32_init(void)
|
||||||
|
{
|
||||||
|
const uint32_t poly = 0xEDB88320;
|
||||||
|
|
||||||
|
uint32_t i;
|
||||||
|
uint32_t j;
|
||||||
|
uint32_t r;
|
||||||
|
|
||||||
|
for (i = 0; i < 256; ++i) {
|
||||||
|
r = i;
|
||||||
|
for (j = 0; j < 8; ++j)
|
||||||
|
r = (r >> 1) ^ (poly & ~((r & 1) - 1));
|
||||||
|
|
||||||
|
xz_crc32_table[i] = r;
|
||||||
|
}
|
||||||
|
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
|
||||||
|
{
|
||||||
|
crc = ~crc;
|
||||||
|
|
||||||
|
while (size != 0) {
|
||||||
|
crc = xz_crc32_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
|
||||||
|
--size;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ~crc;
|
||||||
|
}
|
|
@ -0,0 +1,574 @@
|
||||||
|
/*
|
||||||
|
* Branch/Call/Jump (BCJ) filter decoders
|
||||||
|
*
|
||||||
|
* Authors: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
* Igor Pavlov <http://7-zip.org/>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "xz_private.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The rest of the file is inside this ifdef. It makes things a little more
|
||||||
|
* convenient when building without support for any BCJ filters.
|
||||||
|
*/
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
|
||||||
|
struct xz_dec_bcj {
|
||||||
|
/* Type of the BCJ filter being used */
|
||||||
|
enum {
|
||||||
|
BCJ_X86 = 4, /* x86 or x86-64 */
|
||||||
|
BCJ_POWERPC = 5, /* Big endian only */
|
||||||
|
BCJ_IA64 = 6, /* Big or little endian */
|
||||||
|
BCJ_ARM = 7, /* Little endian only */
|
||||||
|
BCJ_ARMTHUMB = 8, /* Little endian only */
|
||||||
|
BCJ_SPARC = 9 /* Big or little endian */
|
||||||
|
} type;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Return value of the next filter in the chain. We need to preserve
|
||||||
|
* this information across calls, because we must not call the next
|
||||||
|
* filter anymore once it has returned XZ_STREAM_END.
|
||||||
|
*/
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
/* True if we are operating in single-call mode. */
|
||||||
|
bool single_call;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Absolute position relative to the beginning of the uncompressed
|
||||||
|
* data (in a single .xz Block). We care only about the lowest 32
|
||||||
|
* bits so this doesn't need to be uint64_t even with big files.
|
||||||
|
*/
|
||||||
|
uint32_t pos;
|
||||||
|
|
||||||
|
/* x86 filter state */
|
||||||
|
uint32_t x86_prev_mask;
|
||||||
|
|
||||||
|
/* Temporary space to hold the variables from struct xz_buf */
|
||||||
|
uint8_t *out;
|
||||||
|
size_t out_pos;
|
||||||
|
size_t out_size;
|
||||||
|
|
||||||
|
struct {
|
||||||
|
/* Amount of already filtered data in the beginning of buf */
|
||||||
|
size_t filtered;
|
||||||
|
|
||||||
|
/* Total amount of data currently stored in buf */
|
||||||
|
size_t size;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Buffer to hold a mix of filtered and unfiltered data. This
|
||||||
|
* needs to be big enough to hold Alignment + 2 * Look-ahead:
|
||||||
|
*
|
||||||
|
* Type Alignment Look-ahead
|
||||||
|
* x86 1 4
|
||||||
|
* PowerPC 4 0
|
||||||
|
* IA-64 16 0
|
||||||
|
* ARM 4 0
|
||||||
|
* ARM-Thumb 2 2
|
||||||
|
* SPARC 4 0
|
||||||
|
*/
|
||||||
|
uint8_t buf[16];
|
||||||
|
} temp;
|
||||||
|
};
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_X86
|
||||||
|
/*
|
||||||
|
* This is used to test the most significant byte of a memory address
|
||||||
|
* in an x86 instruction.
|
||||||
|
*/
|
||||||
|
static inline int bcj_x86_test_msbyte(uint8_t b)
|
||||||
|
{
|
||||||
|
return b == 0x00 || b == 0xFF;
|
||||||
|
}
|
||||||
|
|
||||||
|
static size_t bcj_x86(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
static const bool mask_to_allowed_status[8]
|
||||||
|
= { true, true, true, false, true, false, false, false };
|
||||||
|
|
||||||
|
static const uint8_t mask_to_bit_num[8] = { 0, 1, 2, 2, 3, 3, 3, 3 };
|
||||||
|
|
||||||
|
size_t i;
|
||||||
|
size_t prev_pos = (size_t)-1;
|
||||||
|
uint32_t prev_mask = s->x86_prev_mask;
|
||||||
|
uint32_t src;
|
||||||
|
uint32_t dest;
|
||||||
|
uint32_t j;
|
||||||
|
uint8_t b;
|
||||||
|
|
||||||
|
if (size <= 4)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
size -= 4;
|
||||||
|
for (i = 0; i < size; ++i) {
|
||||||
|
if ((buf[i] & 0xFE) != 0xE8)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
prev_pos = i - prev_pos;
|
||||||
|
if (prev_pos > 3) {
|
||||||
|
prev_mask = 0;
|
||||||
|
} else {
|
||||||
|
prev_mask = (prev_mask << (prev_pos - 1)) & 7;
|
||||||
|
if (prev_mask != 0) {
|
||||||
|
b = buf[i + 4 - mask_to_bit_num[prev_mask]];
|
||||||
|
if (!mask_to_allowed_status[prev_mask]
|
||||||
|
|| bcj_x86_test_msbyte(b)) {
|
||||||
|
prev_pos = i;
|
||||||
|
prev_mask = (prev_mask << 1) | 1;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
prev_pos = i;
|
||||||
|
|
||||||
|
if (bcj_x86_test_msbyte(buf[i + 4])) {
|
||||||
|
src = get_unaligned_le32(buf + i + 1);
|
||||||
|
while (true) {
|
||||||
|
dest = src - (s->pos + (uint32_t)i + 5);
|
||||||
|
if (prev_mask == 0)
|
||||||
|
break;
|
||||||
|
|
||||||
|
j = mask_to_bit_num[prev_mask] * 8;
|
||||||
|
b = (uint8_t)(dest >> (24 - j));
|
||||||
|
if (!bcj_x86_test_msbyte(b))
|
||||||
|
break;
|
||||||
|
|
||||||
|
src = dest ^ (((uint32_t)1 << (32 - j)) - 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
dest &= 0x01FFFFFF;
|
||||||
|
dest |= (uint32_t)0 - (dest & 0x01000000);
|
||||||
|
put_unaligned_le32(dest, buf + i + 1);
|
||||||
|
i += 4;
|
||||||
|
} else {
|
||||||
|
prev_mask = (prev_mask << 1) | 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
prev_pos = i - prev_pos;
|
||||||
|
s->x86_prev_mask = prev_pos > 3 ? 0 : prev_mask << (prev_pos - 1);
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_POWERPC
|
||||||
|
static size_t bcj_powerpc(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
uint32_t instr;
|
||||||
|
|
||||||
|
for (i = 0; i + 4 <= size; i += 4) {
|
||||||
|
instr = get_unaligned_be32(buf + i);
|
||||||
|
if ((instr & 0xFC000003) == 0x48000001) {
|
||||||
|
instr &= 0x03FFFFFC;
|
||||||
|
instr -= s->pos + (uint32_t)i;
|
||||||
|
instr &= 0x03FFFFFC;
|
||||||
|
instr |= 0x48000001;
|
||||||
|
put_unaligned_be32(instr, buf + i);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_IA64
|
||||||
|
static size_t bcj_ia64(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
static const uint8_t branch_table[32] = {
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
4, 4, 6, 6, 0, 0, 7, 7,
|
||||||
|
4, 4, 0, 0, 4, 4, 0, 0
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The local variables take a little bit stack space, but it's less
|
||||||
|
* than what LZMA2 decoder takes, so it doesn't make sense to reduce
|
||||||
|
* stack usage here without doing that for the LZMA2 decoder too.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Loop counters */
|
||||||
|
size_t i;
|
||||||
|
size_t j;
|
||||||
|
|
||||||
|
/* Instruction slot (0, 1, or 2) in the 128-bit instruction word */
|
||||||
|
uint32_t slot;
|
||||||
|
|
||||||
|
/* Bitwise offset of the instruction indicated by slot */
|
||||||
|
uint32_t bit_pos;
|
||||||
|
|
||||||
|
/* bit_pos split into byte and bit parts */
|
||||||
|
uint32_t byte_pos;
|
||||||
|
uint32_t bit_res;
|
||||||
|
|
||||||
|
/* Address part of an instruction */
|
||||||
|
uint32_t addr;
|
||||||
|
|
||||||
|
/* Mask used to detect which instructions to convert */
|
||||||
|
uint32_t mask;
|
||||||
|
|
||||||
|
/* 41-bit instruction stored somewhere in the lowest 48 bits */
|
||||||
|
uint64_t instr;
|
||||||
|
|
||||||
|
/* Instruction normalized with bit_res for easier manipulation */
|
||||||
|
uint64_t norm;
|
||||||
|
|
||||||
|
for (i = 0; i + 16 <= size; i += 16) {
|
||||||
|
mask = branch_table[buf[i] & 0x1F];
|
||||||
|
for (slot = 0, bit_pos = 5; slot < 3; ++slot, bit_pos += 41) {
|
||||||
|
if (((mask >> slot) & 1) == 0)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
byte_pos = bit_pos >> 3;
|
||||||
|
bit_res = bit_pos & 7;
|
||||||
|
instr = 0;
|
||||||
|
for (j = 0; j < 6; ++j)
|
||||||
|
instr |= (uint64_t)(buf[i + j + byte_pos])
|
||||||
|
<< (8 * j);
|
||||||
|
|
||||||
|
norm = instr >> bit_res;
|
||||||
|
|
||||||
|
if (((norm >> 37) & 0x0F) == 0x05
|
||||||
|
&& ((norm >> 9) & 0x07) == 0) {
|
||||||
|
addr = (norm >> 13) & 0x0FFFFF;
|
||||||
|
addr |= ((uint32_t)(norm >> 36) & 1) << 20;
|
||||||
|
addr <<= 4;
|
||||||
|
addr -= s->pos + (uint32_t)i;
|
||||||
|
addr >>= 4;
|
||||||
|
|
||||||
|
norm &= ~((uint64_t)0x8FFFFF << 13);
|
||||||
|
norm |= (uint64_t)(addr & 0x0FFFFF) << 13;
|
||||||
|
norm |= (uint64_t)(addr & 0x100000)
|
||||||
|
<< (36 - 20);
|
||||||
|
|
||||||
|
instr &= (1 << bit_res) - 1;
|
||||||
|
instr |= norm << bit_res;
|
||||||
|
|
||||||
|
for (j = 0; j < 6; j++)
|
||||||
|
buf[i + j + byte_pos]
|
||||||
|
= (uint8_t)(instr >> (8 * j));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ARM
|
||||||
|
static size_t bcj_arm(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
uint32_t addr;
|
||||||
|
|
||||||
|
for (i = 0; i + 4 <= size; i += 4) {
|
||||||
|
if (buf[i + 3] == 0xEB) {
|
||||||
|
addr = (uint32_t)buf[i] | ((uint32_t)buf[i + 1] << 8)
|
||||||
|
| ((uint32_t)buf[i + 2] << 16);
|
||||||
|
addr <<= 2;
|
||||||
|
addr -= s->pos + (uint32_t)i + 8;
|
||||||
|
addr >>= 2;
|
||||||
|
buf[i] = (uint8_t)addr;
|
||||||
|
buf[i + 1] = (uint8_t)(addr >> 8);
|
||||||
|
buf[i + 2] = (uint8_t)(addr >> 16);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ARMTHUMB
|
||||||
|
static size_t bcj_armthumb(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
uint32_t addr;
|
||||||
|
|
||||||
|
for (i = 0; i + 4 <= size; i += 2) {
|
||||||
|
if ((buf[i + 1] & 0xF8) == 0xF0
|
||||||
|
&& (buf[i + 3] & 0xF8) == 0xF8) {
|
||||||
|
addr = (((uint32_t)buf[i + 1] & 0x07) << 19)
|
||||||
|
| ((uint32_t)buf[i] << 11)
|
||||||
|
| (((uint32_t)buf[i + 3] & 0x07) << 8)
|
||||||
|
| (uint32_t)buf[i + 2];
|
||||||
|
addr <<= 1;
|
||||||
|
addr -= s->pos + (uint32_t)i + 4;
|
||||||
|
addr >>= 1;
|
||||||
|
buf[i + 1] = (uint8_t)(0xF0 | ((addr >> 19) & 0x07));
|
||||||
|
buf[i] = (uint8_t)(addr >> 11);
|
||||||
|
buf[i + 3] = (uint8_t)(0xF8 | ((addr >> 8) & 0x07));
|
||||||
|
buf[i + 2] = (uint8_t)addr;
|
||||||
|
i += 2;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_SPARC
|
||||||
|
static size_t bcj_sparc(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
uint32_t instr;
|
||||||
|
|
||||||
|
for (i = 0; i + 4 <= size; i += 4) {
|
||||||
|
instr = get_unaligned_be32(buf + i);
|
||||||
|
if ((instr >> 22) == 0x100 || (instr >> 22) == 0x1FF) {
|
||||||
|
instr <<= 2;
|
||||||
|
instr -= s->pos + (uint32_t)i;
|
||||||
|
instr >>= 2;
|
||||||
|
instr = ((uint32_t)0x40000000 - (instr & 0x400000))
|
||||||
|
| 0x40000000 | (instr & 0x3FFFFF);
|
||||||
|
put_unaligned_be32(instr, buf + i);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Apply the selected BCJ filter. Update *pos and s->pos to match the amount
|
||||||
|
* of data that got filtered.
|
||||||
|
*
|
||||||
|
* NOTE: This is implemented as a switch statement to avoid using function
|
||||||
|
* pointers, which could be problematic in the kernel boot code, which must
|
||||||
|
* avoid pointers to static data (at least on x86).
|
||||||
|
*/
|
||||||
|
static void bcj_apply(struct xz_dec_bcj *s,
|
||||||
|
uint8_t *buf, size_t *pos, size_t size)
|
||||||
|
{
|
||||||
|
size_t filtered;
|
||||||
|
|
||||||
|
buf += *pos;
|
||||||
|
size -= *pos;
|
||||||
|
|
||||||
|
switch (s->type) {
|
||||||
|
#ifdef XZ_DEC_X86
|
||||||
|
case BCJ_X86:
|
||||||
|
filtered = bcj_x86(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_POWERPC
|
||||||
|
case BCJ_POWERPC:
|
||||||
|
filtered = bcj_powerpc(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_IA64
|
||||||
|
case BCJ_IA64:
|
||||||
|
filtered = bcj_ia64(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_ARM
|
||||||
|
case BCJ_ARM:
|
||||||
|
filtered = bcj_arm(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_ARMTHUMB
|
||||||
|
case BCJ_ARMTHUMB:
|
||||||
|
filtered = bcj_armthumb(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_SPARC
|
||||||
|
case BCJ_SPARC:
|
||||||
|
filtered = bcj_sparc(s, buf, size);
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
default:
|
||||||
|
/* Never reached but silence compiler warnings. */
|
||||||
|
filtered = 0;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
*pos += filtered;
|
||||||
|
s->pos += filtered;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Flush pending filtered data from temp to the output buffer.
|
||||||
|
* Move the remaining mixture of possibly filtered and unfiltered
|
||||||
|
* data to the beginning of temp.
|
||||||
|
*/
|
||||||
|
static void bcj_flush(struct xz_dec_bcj *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
size_t copy_size;
|
||||||
|
|
||||||
|
copy_size = min_t(size_t, s->temp.filtered, b->out_size - b->out_pos);
|
||||||
|
memcpy(b->out + b->out_pos, s->temp.buf, copy_size);
|
||||||
|
b->out_pos += copy_size;
|
||||||
|
|
||||||
|
s->temp.filtered -= copy_size;
|
||||||
|
s->temp.size -= copy_size;
|
||||||
|
memmove(s->temp.buf, s->temp.buf + copy_size, s->temp.size);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The BCJ filter functions are primitive in sense that they process the
|
||||||
|
* data in chunks of 1-16 bytes. To hide this issue, this function does
|
||||||
|
* some buffering.
|
||||||
|
*/
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s,
|
||||||
|
struct xz_dec_lzma2 *lzma2,
|
||||||
|
struct xz_buf *b)
|
||||||
|
{
|
||||||
|
size_t out_start;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Flush pending already filtered data to the output buffer. Return
|
||||||
|
* immediatelly if we couldn't flush everything, or if the next
|
||||||
|
* filter in the chain had already returned XZ_STREAM_END.
|
||||||
|
*/
|
||||||
|
if (s->temp.filtered > 0) {
|
||||||
|
bcj_flush(s, b);
|
||||||
|
if (s->temp.filtered > 0)
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
if (s->ret == XZ_STREAM_END)
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If we have more output space than what is currently pending in
|
||||||
|
* temp, copy the unfiltered data from temp to the output buffer
|
||||||
|
* and try to fill the output buffer by decoding more data from the
|
||||||
|
* next filter in the chain. Apply the BCJ filter on the new data
|
||||||
|
* in the output buffer. If everything cannot be filtered, copy it
|
||||||
|
* to temp and rewind the output buffer position accordingly.
|
||||||
|
*
|
||||||
|
* This needs to be always run when temp.size == 0 to handle a special
|
||||||
|
* case where the output buffer is full and the next filter has no
|
||||||
|
* more output coming but hasn't returned XZ_STREAM_END yet.
|
||||||
|
*/
|
||||||
|
if (s->temp.size < b->out_size - b->out_pos || s->temp.size == 0) {
|
||||||
|
out_start = b->out_pos;
|
||||||
|
memcpy(b->out + b->out_pos, s->temp.buf, s->temp.size);
|
||||||
|
b->out_pos += s->temp.size;
|
||||||
|
|
||||||
|
s->ret = xz_dec_lzma2_run(lzma2, b);
|
||||||
|
if (s->ret != XZ_STREAM_END
|
||||||
|
&& (s->ret != XZ_OK || s->single_call))
|
||||||
|
return s->ret;
|
||||||
|
|
||||||
|
bcj_apply(s, b->out, &out_start, b->out_pos);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* As an exception, if the next filter returned XZ_STREAM_END,
|
||||||
|
* we can do that too, since the last few bytes that remain
|
||||||
|
* unfiltered are meant to remain unfiltered.
|
||||||
|
*/
|
||||||
|
if (s->ret == XZ_STREAM_END)
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
|
||||||
|
s->temp.size = b->out_pos - out_start;
|
||||||
|
b->out_pos -= s->temp.size;
|
||||||
|
memcpy(s->temp.buf, b->out + b->out_pos, s->temp.size);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If there wasn't enough input to the next filter to fill
|
||||||
|
* the output buffer with unfiltered data, there's no point
|
||||||
|
* to try decoding more data to temp.
|
||||||
|
*/
|
||||||
|
if (b->out_pos + s->temp.size < b->out_size)
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* We have unfiltered data in temp. If the output buffer isn't full
|
||||||
|
* yet, try to fill the temp buffer by decoding more data from the
|
||||||
|
* next filter. Apply the BCJ filter on temp. Then we hopefully can
|
||||||
|
* fill the actual output buffer by copying filtered data from temp.
|
||||||
|
* A mix of filtered and unfiltered data may be left in temp; it will
|
||||||
|
* be taken care on the next call to this function.
|
||||||
|
*/
|
||||||
|
if (b->out_pos < b->out_size) {
|
||||||
|
/* Make b->out{,_pos,_size} temporarily point to s->temp. */
|
||||||
|
s->out = b->out;
|
||||||
|
s->out_pos = b->out_pos;
|
||||||
|
s->out_size = b->out_size;
|
||||||
|
b->out = s->temp.buf;
|
||||||
|
b->out_pos = s->temp.size;
|
||||||
|
b->out_size = sizeof(s->temp.buf);
|
||||||
|
|
||||||
|
s->ret = xz_dec_lzma2_run(lzma2, b);
|
||||||
|
|
||||||
|
s->temp.size = b->out_pos;
|
||||||
|
b->out = s->out;
|
||||||
|
b->out_pos = s->out_pos;
|
||||||
|
b->out_size = s->out_size;
|
||||||
|
|
||||||
|
if (s->ret != XZ_OK && s->ret != XZ_STREAM_END)
|
||||||
|
return s->ret;
|
||||||
|
|
||||||
|
bcj_apply(s, s->temp.buf, &s->temp.filtered, s->temp.size);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If the next filter returned XZ_STREAM_END, we mark that
|
||||||
|
* everything is filtered, since the last unfiltered bytes
|
||||||
|
* of the stream are meant to be left as is.
|
||||||
|
*/
|
||||||
|
if (s->ret == XZ_STREAM_END)
|
||||||
|
s->temp.filtered = s->temp.size;
|
||||||
|
|
||||||
|
bcj_flush(s, b);
|
||||||
|
if (s->temp.filtered > 0)
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
return s->ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN struct xz_dec_bcj *xz_dec_bcj_create(bool single_call)
|
||||||
|
{
|
||||||
|
struct xz_dec_bcj *s = kmalloc(sizeof(*s), GFP_KERNEL);
|
||||||
|
if (s != NULL)
|
||||||
|
s->single_call = single_call;
|
||||||
|
|
||||||
|
return s;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id)
|
||||||
|
{
|
||||||
|
switch (id) {
|
||||||
|
#ifdef XZ_DEC_X86
|
||||||
|
case BCJ_X86:
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_POWERPC
|
||||||
|
case BCJ_POWERPC:
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_IA64
|
||||||
|
case BCJ_IA64:
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_ARM
|
||||||
|
case BCJ_ARM:
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_ARMTHUMB
|
||||||
|
case BCJ_ARMTHUMB:
|
||||||
|
#endif
|
||||||
|
#ifdef XZ_DEC_SPARC
|
||||||
|
case BCJ_SPARC:
|
||||||
|
#endif
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
/* Unsupported Filter ID */
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
s->type = id;
|
||||||
|
s->ret = XZ_OK;
|
||||||
|
s->pos = 0;
|
||||||
|
s->x86_prev_mask = 0;
|
||||||
|
s->temp.filtered = 0;
|
||||||
|
s->temp.size = 0;
|
||||||
|
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif
|
File diff suppressed because it is too large
Load Diff
|
@ -0,0 +1,821 @@
|
||||||
|
/*
|
||||||
|
* .xz Stream decoder
|
||||||
|
*
|
||||||
|
* Author: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "xz_private.h"
|
||||||
|
#include "xz_stream.h"
|
||||||
|
|
||||||
|
/* Hash used to validate the Index field */
|
||||||
|
struct xz_dec_hash {
|
||||||
|
vli_type unpadded;
|
||||||
|
vli_type uncompressed;
|
||||||
|
uint32_t crc32;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct xz_dec {
|
||||||
|
/* Position in dec_main() */
|
||||||
|
enum {
|
||||||
|
SEQ_STREAM_HEADER,
|
||||||
|
SEQ_BLOCK_START,
|
||||||
|
SEQ_BLOCK_HEADER,
|
||||||
|
SEQ_BLOCK_UNCOMPRESS,
|
||||||
|
SEQ_BLOCK_PADDING,
|
||||||
|
SEQ_BLOCK_CHECK,
|
||||||
|
SEQ_INDEX,
|
||||||
|
SEQ_INDEX_PADDING,
|
||||||
|
SEQ_INDEX_CRC32,
|
||||||
|
SEQ_STREAM_FOOTER
|
||||||
|
} sequence;
|
||||||
|
|
||||||
|
/* Position in variable-length integers and Check fields */
|
||||||
|
uint32_t pos;
|
||||||
|
|
||||||
|
/* Variable-length integer decoded by dec_vli() */
|
||||||
|
vli_type vli;
|
||||||
|
|
||||||
|
/* Saved in_pos and out_pos */
|
||||||
|
size_t in_start;
|
||||||
|
size_t out_start;
|
||||||
|
|
||||||
|
/* CRC32 value in Block or Index */
|
||||||
|
uint32_t crc32;
|
||||||
|
|
||||||
|
/* Type of the integrity check calculated from uncompressed data */
|
||||||
|
enum xz_check check_type;
|
||||||
|
|
||||||
|
/* Operation mode */
|
||||||
|
enum xz_mode mode;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* True if the next call to xz_dec_run() is allowed to return
|
||||||
|
* XZ_BUF_ERROR.
|
||||||
|
*/
|
||||||
|
bool allow_buf_error;
|
||||||
|
|
||||||
|
/* Information stored in Block Header */
|
||||||
|
struct {
|
||||||
|
/*
|
||||||
|
* Value stored in the Compressed Size field, or
|
||||||
|
* VLI_UNKNOWN if Compressed Size is not present.
|
||||||
|
*/
|
||||||
|
vli_type compressed;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Value stored in the Uncompressed Size field, or
|
||||||
|
* VLI_UNKNOWN if Uncompressed Size is not present.
|
||||||
|
*/
|
||||||
|
vli_type uncompressed;
|
||||||
|
|
||||||
|
/* Size of the Block Header field */
|
||||||
|
uint32_t size;
|
||||||
|
} block_header;
|
||||||
|
|
||||||
|
/* Information collected when decoding Blocks */
|
||||||
|
struct {
|
||||||
|
/* Observed compressed size of the current Block */
|
||||||
|
vli_type compressed;
|
||||||
|
|
||||||
|
/* Observed uncompressed size of the current Block */
|
||||||
|
vli_type uncompressed;
|
||||||
|
|
||||||
|
/* Number of Blocks decoded so far */
|
||||||
|
vli_type count;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Hash calculated from the Block sizes. This is used to
|
||||||
|
* validate the Index field.
|
||||||
|
*/
|
||||||
|
struct xz_dec_hash hash;
|
||||||
|
} block;
|
||||||
|
|
||||||
|
/* Variables needed when verifying the Index field */
|
||||||
|
struct {
|
||||||
|
/* Position in dec_index() */
|
||||||
|
enum {
|
||||||
|
SEQ_INDEX_COUNT,
|
||||||
|
SEQ_INDEX_UNPADDED,
|
||||||
|
SEQ_INDEX_UNCOMPRESSED
|
||||||
|
} sequence;
|
||||||
|
|
||||||
|
/* Size of the Index in bytes */
|
||||||
|
vli_type size;
|
||||||
|
|
||||||
|
/* Number of Records (matches block.count in valid files) */
|
||||||
|
vli_type count;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Hash calculated from the Records (matches block.hash in
|
||||||
|
* valid files).
|
||||||
|
*/
|
||||||
|
struct xz_dec_hash hash;
|
||||||
|
} index;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Temporary buffer needed to hold Stream Header, Block Header,
|
||||||
|
* and Stream Footer. The Block Header is the biggest (1 KiB)
|
||||||
|
* so we reserve space according to that. buf[] has to be aligned
|
||||||
|
* to a multiple of four bytes; the size_t variables before it
|
||||||
|
* should guarantee this.
|
||||||
|
*/
|
||||||
|
struct {
|
||||||
|
size_t pos;
|
||||||
|
size_t size;
|
||||||
|
uint8_t buf[1024];
|
||||||
|
} temp;
|
||||||
|
|
||||||
|
struct xz_dec_lzma2 *lzma2;
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
struct xz_dec_bcj *bcj;
|
||||||
|
bool bcj_active;
|
||||||
|
#endif
|
||||||
|
};
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ANY_CHECK
|
||||||
|
/* Sizes of the Check field with different Check IDs */
|
||||||
|
static const uint8_t check_sizes[16] = {
|
||||||
|
0,
|
||||||
|
4, 4, 4,
|
||||||
|
8, 8, 8,
|
||||||
|
16, 16, 16,
|
||||||
|
32, 32, 32,
|
||||||
|
64, 64, 64
|
||||||
|
};
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Fill s->temp by copying data starting from b->in[b->in_pos]. Caller
|
||||||
|
* must have set s->temp.pos to indicate how much data we are supposed
|
||||||
|
* to copy into s->temp.buf. Return true once s->temp.pos has reached
|
||||||
|
* s->temp.size.
|
||||||
|
*/
|
||||||
|
static bool fill_temp(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
size_t copy_size = min_t(size_t,
|
||||||
|
b->in_size - b->in_pos, s->temp.size - s->temp.pos);
|
||||||
|
|
||||||
|
memcpy(s->temp.buf + s->temp.pos, b->in + b->in_pos, copy_size);
|
||||||
|
b->in_pos += copy_size;
|
||||||
|
s->temp.pos += copy_size;
|
||||||
|
|
||||||
|
if (s->temp.pos == s->temp.size) {
|
||||||
|
s->temp.pos = 0;
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Decode a variable-length integer (little-endian base-128 encoding) */
|
||||||
|
static enum xz_ret dec_vli(struct xz_dec *s, const uint8_t *in,
|
||||||
|
size_t *in_pos, size_t in_size)
|
||||||
|
{
|
||||||
|
uint8_t byte;
|
||||||
|
|
||||||
|
if (s->pos == 0)
|
||||||
|
s->vli = 0;
|
||||||
|
|
||||||
|
while (*in_pos < in_size) {
|
||||||
|
byte = in[*in_pos];
|
||||||
|
++*in_pos;
|
||||||
|
|
||||||
|
s->vli |= (vli_type)(byte & 0x7F) << s->pos;
|
||||||
|
|
||||||
|
if ((byte & 0x80) == 0) {
|
||||||
|
/* Don't allow non-minimal encodings. */
|
||||||
|
if (byte == 0 && s->pos != 0)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->pos = 0;
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
}
|
||||||
|
|
||||||
|
s->pos += 7;
|
||||||
|
if (s->pos == 7 * VLI_BYTES_MAX)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Decode the Compressed Data field from a Block. Update and validate
|
||||||
|
* the observed compressed and uncompressed sizes of the Block so that
|
||||||
|
* they don't exceed the values possibly stored in the Block Header
|
||||||
|
* (validation assumes that no integer overflow occurs, since vli_type
|
||||||
|
* is normally uint64_t). Update the CRC32 if presence of the CRC32
|
||||||
|
* field was indicated in Stream Header.
|
||||||
|
*
|
||||||
|
* Once the decoding is finished, validate that the observed sizes match
|
||||||
|
* the sizes possibly stored in the Block Header. Update the hash and
|
||||||
|
* Block count, which are later used to validate the Index field.
|
||||||
|
*/
|
||||||
|
static enum xz_ret dec_block(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
s->in_start = b->in_pos;
|
||||||
|
s->out_start = b->out_pos;
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
if (s->bcj_active)
|
||||||
|
ret = xz_dec_bcj_run(s->bcj, s->lzma2, b);
|
||||||
|
else
|
||||||
|
#endif
|
||||||
|
ret = xz_dec_lzma2_run(s->lzma2, b);
|
||||||
|
|
||||||
|
s->block.compressed += b->in_pos - s->in_start;
|
||||||
|
s->block.uncompressed += b->out_pos - s->out_start;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* There is no need to separately check for VLI_UNKNOWN, since
|
||||||
|
* the observed sizes are always smaller than VLI_UNKNOWN.
|
||||||
|
*/
|
||||||
|
if (s->block.compressed > s->block_header.compressed
|
||||||
|
|| s->block.uncompressed
|
||||||
|
> s->block_header.uncompressed)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
if (s->check_type == XZ_CHECK_CRC32)
|
||||||
|
s->crc32 = xz_crc32(b->out + s->out_start,
|
||||||
|
b->out_pos - s->out_start, s->crc32);
|
||||||
|
|
||||||
|
if (ret == XZ_STREAM_END) {
|
||||||
|
if (s->block_header.compressed != VLI_UNKNOWN
|
||||||
|
&& s->block_header.compressed
|
||||||
|
!= s->block.compressed)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
if (s->block_header.uncompressed != VLI_UNKNOWN
|
||||||
|
&& s->block_header.uncompressed
|
||||||
|
!= s->block.uncompressed)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->block.hash.unpadded += s->block_header.size
|
||||||
|
+ s->block.compressed;
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ANY_CHECK
|
||||||
|
s->block.hash.unpadded += check_sizes[s->check_type];
|
||||||
|
#else
|
||||||
|
if (s->check_type == XZ_CHECK_CRC32)
|
||||||
|
s->block.hash.unpadded += 4;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
s->block.hash.uncompressed += s->block.uncompressed;
|
||||||
|
s->block.hash.crc32 = xz_crc32(
|
||||||
|
(const uint8_t *)&s->block.hash,
|
||||||
|
sizeof(s->block.hash), s->block.hash.crc32);
|
||||||
|
|
||||||
|
++s->block.count;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Update the Index size and the CRC32 value. */
|
||||||
|
static void index_update(struct xz_dec *s, const struct xz_buf *b)
|
||||||
|
{
|
||||||
|
size_t in_used = b->in_pos - s->in_start;
|
||||||
|
s->index.size += in_used;
|
||||||
|
s->crc32 = xz_crc32(b->in + s->in_start, in_used, s->crc32);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Decode the Number of Records, Unpadded Size, and Uncompressed Size
|
||||||
|
* fields from the Index field. That is, Index Padding and CRC32 are not
|
||||||
|
* decoded by this function.
|
||||||
|
*
|
||||||
|
* This can return XZ_OK (more input needed), XZ_STREAM_END (everything
|
||||||
|
* successfully decoded), or XZ_DATA_ERROR (input is corrupt).
|
||||||
|
*/
|
||||||
|
static enum xz_ret dec_index(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
do {
|
||||||
|
ret = dec_vli(s, b->in, &b->in_pos, b->in_size);
|
||||||
|
if (ret != XZ_STREAM_END) {
|
||||||
|
index_update(s, b);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
switch (s->index.sequence) {
|
||||||
|
case SEQ_INDEX_COUNT:
|
||||||
|
s->index.count = s->vli;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Validate that the Number of Records field
|
||||||
|
* indicates the same number of Records as
|
||||||
|
* there were Blocks in the Stream.
|
||||||
|
*/
|
||||||
|
if (s->index.count != s->block.count)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->index.sequence = SEQ_INDEX_UNPADDED;
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SEQ_INDEX_UNPADDED:
|
||||||
|
s->index.hash.unpadded += s->vli;
|
||||||
|
s->index.sequence = SEQ_INDEX_UNCOMPRESSED;
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SEQ_INDEX_UNCOMPRESSED:
|
||||||
|
s->index.hash.uncompressed += s->vli;
|
||||||
|
s->index.hash.crc32 = xz_crc32(
|
||||||
|
(const uint8_t *)&s->index.hash,
|
||||||
|
sizeof(s->index.hash),
|
||||||
|
s->index.hash.crc32);
|
||||||
|
--s->index.count;
|
||||||
|
s->index.sequence = SEQ_INDEX_UNPADDED;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
} while (s->index.count > 0);
|
||||||
|
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Validate that the next four input bytes match the value of s->crc32.
|
||||||
|
* s->pos must be zero when starting to validate the first byte.
|
||||||
|
*/
|
||||||
|
static enum xz_ret crc32_validate(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
do {
|
||||||
|
if (b->in_pos == b->in_size)
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
if (((s->crc32 >> s->pos) & 0xFF) != b->in[b->in_pos++])
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->pos += 8;
|
||||||
|
|
||||||
|
} while (s->pos < 32);
|
||||||
|
|
||||||
|
s->crc32 = 0;
|
||||||
|
s->pos = 0;
|
||||||
|
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ANY_CHECK
|
||||||
|
/*
|
||||||
|
* Skip over the Check field when the Check ID is not supported.
|
||||||
|
* Returns true once the whole Check field has been skipped over.
|
||||||
|
*/
|
||||||
|
static bool check_skip(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
while (s->pos < check_sizes[s->check_type]) {
|
||||||
|
if (b->in_pos == b->in_size)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
++b->in_pos;
|
||||||
|
++s->pos;
|
||||||
|
}
|
||||||
|
|
||||||
|
s->pos = 0;
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Decode the Stream Header field (the first 12 bytes of the .xz Stream). */
|
||||||
|
static enum xz_ret dec_stream_header(struct xz_dec *s)
|
||||||
|
{
|
||||||
|
if (!memeq(s->temp.buf, HEADER_MAGIC, HEADER_MAGIC_SIZE))
|
||||||
|
return XZ_FORMAT_ERROR;
|
||||||
|
|
||||||
|
if (xz_crc32(s->temp.buf + HEADER_MAGIC_SIZE, 2, 0)
|
||||||
|
!= get_le32(s->temp.buf + HEADER_MAGIC_SIZE + 2))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
if (s->temp.buf[HEADER_MAGIC_SIZE] != 0)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Of integrity checks, we support only none (Check ID = 0) and
|
||||||
|
* CRC32 (Check ID = 1). However, if XZ_DEC_ANY_CHECK is defined,
|
||||||
|
* we will accept other check types too, but then the check won't
|
||||||
|
* be verified and a warning (XZ_UNSUPPORTED_CHECK) will be given.
|
||||||
|
*/
|
||||||
|
s->check_type = s->temp.buf[HEADER_MAGIC_SIZE + 1];
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_ANY_CHECK
|
||||||
|
if (s->check_type > XZ_CHECK_MAX)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
if (s->check_type > XZ_CHECK_CRC32)
|
||||||
|
return XZ_UNSUPPORTED_CHECK;
|
||||||
|
#else
|
||||||
|
if (s->check_type > XZ_CHECK_CRC32)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Decode the Stream Footer field (the last 12 bytes of the .xz Stream) */
|
||||||
|
static enum xz_ret dec_stream_footer(struct xz_dec *s)
|
||||||
|
{
|
||||||
|
if (!memeq(s->temp.buf + 10, FOOTER_MAGIC, FOOTER_MAGIC_SIZE))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
if (xz_crc32(s->temp.buf + 4, 6, 0) != get_le32(s->temp.buf))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Validate Backward Size. Note that we never added the size of the
|
||||||
|
* Index CRC32 field to s->index.size, thus we use s->index.size / 4
|
||||||
|
* instead of s->index.size / 4 - 1.
|
||||||
|
*/
|
||||||
|
if ((s->index.size >> 2) != get_le32(s->temp.buf + 4))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
if (s->temp.buf[8] != 0 || s->temp.buf[9] != s->check_type)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Use XZ_STREAM_END instead of XZ_OK to be more convenient
|
||||||
|
* for the caller.
|
||||||
|
*/
|
||||||
|
return XZ_STREAM_END;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Decode the Block Header and initialize the filter chain. */
|
||||||
|
static enum xz_ret dec_block_header(struct xz_dec *s)
|
||||||
|
{
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Validate the CRC32. We know that the temp buffer is at least
|
||||||
|
* eight bytes so this is safe.
|
||||||
|
*/
|
||||||
|
s->temp.size -= 4;
|
||||||
|
if (xz_crc32(s->temp.buf, s->temp.size, 0)
|
||||||
|
!= get_le32(s->temp.buf + s->temp.size))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->temp.pos = 2;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Catch unsupported Block Flags. We support only one or two filters
|
||||||
|
* in the chain, so we catch that with the same test.
|
||||||
|
*/
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
if (s->temp.buf[1] & 0x3E)
|
||||||
|
#else
|
||||||
|
if (s->temp.buf[1] & 0x3F)
|
||||||
|
#endif
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
/* Compressed Size */
|
||||||
|
if (s->temp.buf[1] & 0x40) {
|
||||||
|
if (dec_vli(s, s->temp.buf, &s->temp.pos, s->temp.size)
|
||||||
|
!= XZ_STREAM_END)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->block_header.compressed = s->vli;
|
||||||
|
} else {
|
||||||
|
s->block_header.compressed = VLI_UNKNOWN;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Uncompressed Size */
|
||||||
|
if (s->temp.buf[1] & 0x80) {
|
||||||
|
if (dec_vli(s, s->temp.buf, &s->temp.pos, s->temp.size)
|
||||||
|
!= XZ_STREAM_END)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->block_header.uncompressed = s->vli;
|
||||||
|
} else {
|
||||||
|
s->block_header.uncompressed = VLI_UNKNOWN;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
/* If there are two filters, the first one must be a BCJ filter. */
|
||||||
|
s->bcj_active = s->temp.buf[1] & 0x01;
|
||||||
|
if (s->bcj_active) {
|
||||||
|
if (s->temp.size - s->temp.pos < 2)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
ret = xz_dec_bcj_reset(s->bcj, s->temp.buf[s->temp.pos++]);
|
||||||
|
if (ret != XZ_OK)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* We don't support custom start offset,
|
||||||
|
* so Size of Properties must be zero.
|
||||||
|
*/
|
||||||
|
if (s->temp.buf[s->temp.pos++] != 0x00)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Valid Filter Flags always take at least two bytes. */
|
||||||
|
if (s->temp.size - s->temp.pos < 2)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
/* Filter ID = LZMA2 */
|
||||||
|
if (s->temp.buf[s->temp.pos++] != 0x21)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
/* Size of Properties = 1-byte Filter Properties */
|
||||||
|
if (s->temp.buf[s->temp.pos++] != 0x01)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
/* Filter Properties contains LZMA2 dictionary size. */
|
||||||
|
if (s->temp.size - s->temp.pos < 1)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
ret = xz_dec_lzma2_reset(s->lzma2, s->temp.buf[s->temp.pos++]);
|
||||||
|
if (ret != XZ_OK)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
/* The rest must be Header Padding. */
|
||||||
|
while (s->temp.pos < s->temp.size)
|
||||||
|
if (s->temp.buf[s->temp.pos++] != 0x00)
|
||||||
|
return XZ_OPTIONS_ERROR;
|
||||||
|
|
||||||
|
s->temp.pos = 0;
|
||||||
|
s->block.compressed = 0;
|
||||||
|
s->block.uncompressed = 0;
|
||||||
|
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Store the start position for the case when we are in the middle
|
||||||
|
* of the Index field.
|
||||||
|
*/
|
||||||
|
s->in_start = b->in_pos;
|
||||||
|
|
||||||
|
while (true) {
|
||||||
|
switch (s->sequence) {
|
||||||
|
case SEQ_STREAM_HEADER:
|
||||||
|
/*
|
||||||
|
* Stream Header is copied to s->temp, and then
|
||||||
|
* decoded from there. This way if the caller
|
||||||
|
* gives us only little input at a time, we can
|
||||||
|
* still keep the Stream Header decoding code
|
||||||
|
* simple. Similar approach is used in many places
|
||||||
|
* in this file.
|
||||||
|
*/
|
||||||
|
if (!fill_temp(s, b))
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If dec_stream_header() returns
|
||||||
|
* XZ_UNSUPPORTED_CHECK, it is still possible
|
||||||
|
* to continue decoding if working in multi-call
|
||||||
|
* mode. Thus, update s->sequence before calling
|
||||||
|
* dec_stream_header().
|
||||||
|
*/
|
||||||
|
s->sequence = SEQ_BLOCK_START;
|
||||||
|
|
||||||
|
ret = dec_stream_header(s);
|
||||||
|
if (ret != XZ_OK)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
case SEQ_BLOCK_START:
|
||||||
|
/* We need one byte of input to continue. */
|
||||||
|
if (b->in_pos == b->in_size)
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
/* See if this is the beginning of the Index field. */
|
||||||
|
if (b->in[b->in_pos] == 0) {
|
||||||
|
s->in_start = b->in_pos++;
|
||||||
|
s->sequence = SEQ_INDEX;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Calculate the size of the Block Header and
|
||||||
|
* prepare to decode it.
|
||||||
|
*/
|
||||||
|
s->block_header.size
|
||||||
|
= ((uint32_t)b->in[b->in_pos] + 1) * 4;
|
||||||
|
|
||||||
|
s->temp.size = s->block_header.size;
|
||||||
|
s->temp.pos = 0;
|
||||||
|
s->sequence = SEQ_BLOCK_HEADER;
|
||||||
|
|
||||||
|
case SEQ_BLOCK_HEADER:
|
||||||
|
if (!fill_temp(s, b))
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
ret = dec_block_header(s);
|
||||||
|
if (ret != XZ_OK)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
s->sequence = SEQ_BLOCK_UNCOMPRESS;
|
||||||
|
|
||||||
|
case SEQ_BLOCK_UNCOMPRESS:
|
||||||
|
ret = dec_block(s, b);
|
||||||
|
if (ret != XZ_STREAM_END)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
s->sequence = SEQ_BLOCK_PADDING;
|
||||||
|
|
||||||
|
case SEQ_BLOCK_PADDING:
|
||||||
|
/*
|
||||||
|
* Size of Compressed Data + Block Padding
|
||||||
|
* must be a multiple of four. We don't need
|
||||||
|
* s->block.compressed for anything else
|
||||||
|
* anymore, so we use it here to test the size
|
||||||
|
* of the Block Padding field.
|
||||||
|
*/
|
||||||
|
while (s->block.compressed & 3) {
|
||||||
|
if (b->in_pos == b->in_size)
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
if (b->in[b->in_pos++] != 0)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
++s->block.compressed;
|
||||||
|
}
|
||||||
|
|
||||||
|
s->sequence = SEQ_BLOCK_CHECK;
|
||||||
|
|
||||||
|
case SEQ_BLOCK_CHECK:
|
||||||
|
if (s->check_type == XZ_CHECK_CRC32) {
|
||||||
|
ret = crc32_validate(s, b);
|
||||||
|
if (ret != XZ_STREAM_END)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
#ifdef XZ_DEC_ANY_CHECK
|
||||||
|
else if (!check_skip(s, b)) {
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
s->sequence = SEQ_BLOCK_START;
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SEQ_INDEX:
|
||||||
|
ret = dec_index(s, b);
|
||||||
|
if (ret != XZ_STREAM_END)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
s->sequence = SEQ_INDEX_PADDING;
|
||||||
|
|
||||||
|
case SEQ_INDEX_PADDING:
|
||||||
|
while ((s->index.size + (b->in_pos - s->in_start))
|
||||||
|
& 3) {
|
||||||
|
if (b->in_pos == b->in_size) {
|
||||||
|
index_update(s, b);
|
||||||
|
return XZ_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (b->in[b->in_pos++] != 0)
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Finish the CRC32 value and Index size. */
|
||||||
|
index_update(s, b);
|
||||||
|
|
||||||
|
/* Compare the hashes to validate the Index field. */
|
||||||
|
if (!memeq(&s->block.hash, &s->index.hash,
|
||||||
|
sizeof(s->block.hash)))
|
||||||
|
return XZ_DATA_ERROR;
|
||||||
|
|
||||||
|
s->sequence = SEQ_INDEX_CRC32;
|
||||||
|
|
||||||
|
case SEQ_INDEX_CRC32:
|
||||||
|
ret = crc32_validate(s, b);
|
||||||
|
if (ret != XZ_STREAM_END)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
s->temp.size = STREAM_HEADER_SIZE;
|
||||||
|
s->sequence = SEQ_STREAM_FOOTER;
|
||||||
|
|
||||||
|
case SEQ_STREAM_FOOTER:
|
||||||
|
if (!fill_temp(s, b))
|
||||||
|
return XZ_OK;
|
||||||
|
|
||||||
|
return dec_stream_footer(s);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Never reached */
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* xz_dec_run() is a wrapper for dec_main() to handle some special cases in
|
||||||
|
* multi-call and single-call decoding.
|
||||||
|
*
|
||||||
|
* In multi-call mode, we must return XZ_BUF_ERROR when it seems clear that we
|
||||||
|
* are not going to make any progress anymore. This is to prevent the caller
|
||||||
|
* from calling us infinitely when the input file is truncated or otherwise
|
||||||
|
* corrupt. Since zlib-style API allows that the caller fills the input buffer
|
||||||
|
* only when the decoder doesn't produce any new output, we have to be careful
|
||||||
|
* to avoid returning XZ_BUF_ERROR too easily: XZ_BUF_ERROR is returned only
|
||||||
|
* after the second consecutive call to xz_dec_run() that makes no progress.
|
||||||
|
*
|
||||||
|
* In single-call mode, if we couldn't decode everything and no error
|
||||||
|
* occurred, either the input is truncated or the output buffer is too small.
|
||||||
|
* Since we know that the last input byte never produces any output, we know
|
||||||
|
* that if all the input was consumed and decoding wasn't finished, the file
|
||||||
|
* must be corrupt. Otherwise the output buffer has to be too small or the
|
||||||
|
* file is corrupt in a way that decoding it produces too big output.
|
||||||
|
*
|
||||||
|
* If single-call decoding fails, we reset b->in_pos and b->out_pos back to
|
||||||
|
* their original values. This is because with some filter chains there won't
|
||||||
|
* be any valid uncompressed data in the output buffer unless the decoding
|
||||||
|
* actually succeeds (that's the price to pay of using the output buffer as
|
||||||
|
* the workspace).
|
||||||
|
*/
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_run(struct xz_dec *s, struct xz_buf *b)
|
||||||
|
{
|
||||||
|
size_t in_start;
|
||||||
|
size_t out_start;
|
||||||
|
enum xz_ret ret;
|
||||||
|
|
||||||
|
if (DEC_IS_SINGLE(s->mode))
|
||||||
|
xz_dec_reset(s);
|
||||||
|
|
||||||
|
in_start = b->in_pos;
|
||||||
|
out_start = b->out_pos;
|
||||||
|
ret = dec_main(s, b);
|
||||||
|
|
||||||
|
if (DEC_IS_SINGLE(s->mode)) {
|
||||||
|
if (ret == XZ_OK)
|
||||||
|
ret = b->in_pos == b->in_size
|
||||||
|
? XZ_DATA_ERROR : XZ_BUF_ERROR;
|
||||||
|
|
||||||
|
if (ret != XZ_STREAM_END) {
|
||||||
|
b->in_pos = in_start;
|
||||||
|
b->out_pos = out_start;
|
||||||
|
}
|
||||||
|
|
||||||
|
} else if (ret == XZ_OK && in_start == b->in_pos
|
||||||
|
&& out_start == b->out_pos) {
|
||||||
|
if (s->allow_buf_error)
|
||||||
|
ret = XZ_BUF_ERROR;
|
||||||
|
|
||||||
|
s->allow_buf_error = true;
|
||||||
|
} else {
|
||||||
|
s->allow_buf_error = false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN struct xz_dec *xz_dec_init(enum xz_mode mode, uint32_t dict_max)
|
||||||
|
{
|
||||||
|
struct xz_dec *s = kmalloc(sizeof(*s), GFP_KERNEL);
|
||||||
|
if (s == NULL)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
s->mode = mode;
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
s->bcj = xz_dec_bcj_create(DEC_IS_SINGLE(mode));
|
||||||
|
if (s->bcj == NULL)
|
||||||
|
goto error_bcj;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
s->lzma2 = xz_dec_lzma2_create(mode, dict_max);
|
||||||
|
if (s->lzma2 == NULL)
|
||||||
|
goto error_lzma2;
|
||||||
|
|
||||||
|
xz_dec_reset(s);
|
||||||
|
return s;
|
||||||
|
|
||||||
|
error_lzma2:
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
xz_dec_bcj_end(s->bcj);
|
||||||
|
error_bcj:
|
||||||
|
#endif
|
||||||
|
kfree(s);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN void xz_dec_reset(struct xz_dec *s)
|
||||||
|
{
|
||||||
|
s->sequence = SEQ_STREAM_HEADER;
|
||||||
|
s->allow_buf_error = false;
|
||||||
|
s->pos = 0;
|
||||||
|
s->crc32 = 0;
|
||||||
|
memzero(&s->block, sizeof(s->block));
|
||||||
|
memzero(&s->index, sizeof(s->index));
|
||||||
|
s->temp.pos = 0;
|
||||||
|
s->temp.size = STREAM_HEADER_SIZE;
|
||||||
|
}
|
||||||
|
|
||||||
|
XZ_EXTERN void xz_dec_end(struct xz_dec *s)
|
||||||
|
{
|
||||||
|
if (s != NULL) {
|
||||||
|
xz_dec_lzma2_end(s->lzma2);
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
xz_dec_bcj_end(s->bcj);
|
||||||
|
#endif
|
||||||
|
kfree(s);
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,204 @@
|
||||||
|
/*
|
||||||
|
* LZMA2 definitions
|
||||||
|
*
|
||||||
|
* Authors: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
* Igor Pavlov <http://7-zip.org/>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef XZ_LZMA2_H
|
||||||
|
#define XZ_LZMA2_H
|
||||||
|
|
||||||
|
/* Range coder constants */
|
||||||
|
#define RC_SHIFT_BITS 8
|
||||||
|
#define RC_TOP_BITS 24
|
||||||
|
#define RC_TOP_VALUE (1 << RC_TOP_BITS)
|
||||||
|
#define RC_BIT_MODEL_TOTAL_BITS 11
|
||||||
|
#define RC_BIT_MODEL_TOTAL (1 << RC_BIT_MODEL_TOTAL_BITS)
|
||||||
|
#define RC_MOVE_BITS 5
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Maximum number of position states. A position state is the lowest pb
|
||||||
|
* number of bits of the current uncompressed offset. In some places there
|
||||||
|
* are different sets of probabilities for different position states.
|
||||||
|
*/
|
||||||
|
#define POS_STATES_MAX (1 << 4)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This enum is used to track which LZMA symbols have occurred most recently
|
||||||
|
* and in which order. This information is used to predict the next symbol.
|
||||||
|
*
|
||||||
|
* Symbols:
|
||||||
|
* - Literal: One 8-bit byte
|
||||||
|
* - Match: Repeat a chunk of data at some distance
|
||||||
|
* - Long repeat: Multi-byte match at a recently seen distance
|
||||||
|
* - Short repeat: One-byte repeat at a recently seen distance
|
||||||
|
*
|
||||||
|
* The symbol names are in from STATE_oldest_older_previous. REP means
|
||||||
|
* either short or long repeated match, and NONLIT means any non-literal.
|
||||||
|
*/
|
||||||
|
enum lzma_state {
|
||||||
|
STATE_LIT_LIT,
|
||||||
|
STATE_MATCH_LIT_LIT,
|
||||||
|
STATE_REP_LIT_LIT,
|
||||||
|
STATE_SHORTREP_LIT_LIT,
|
||||||
|
STATE_MATCH_LIT,
|
||||||
|
STATE_REP_LIT,
|
||||||
|
STATE_SHORTREP_LIT,
|
||||||
|
STATE_LIT_MATCH,
|
||||||
|
STATE_LIT_LONGREP,
|
||||||
|
STATE_LIT_SHORTREP,
|
||||||
|
STATE_NONLIT_MATCH,
|
||||||
|
STATE_NONLIT_REP
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Total number of states */
|
||||||
|
#define STATES 12
|
||||||
|
|
||||||
|
/* The lowest 7 states indicate that the previous state was a literal. */
|
||||||
|
#define LIT_STATES 7
|
||||||
|
|
||||||
|
/* Indicate that the latest symbol was a literal. */
|
||||||
|
static inline void lzma_state_literal(enum lzma_state *state)
|
||||||
|
{
|
||||||
|
if (*state <= STATE_SHORTREP_LIT_LIT)
|
||||||
|
*state = STATE_LIT_LIT;
|
||||||
|
else if (*state <= STATE_LIT_SHORTREP)
|
||||||
|
*state -= 3;
|
||||||
|
else
|
||||||
|
*state -= 6;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Indicate that the latest symbol was a match. */
|
||||||
|
static inline void lzma_state_match(enum lzma_state *state)
|
||||||
|
{
|
||||||
|
*state = *state < LIT_STATES ? STATE_LIT_MATCH : STATE_NONLIT_MATCH;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Indicate that the latest state was a long repeated match. */
|
||||||
|
static inline void lzma_state_long_rep(enum lzma_state *state)
|
||||||
|
{
|
||||||
|
*state = *state < LIT_STATES ? STATE_LIT_LONGREP : STATE_NONLIT_REP;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Indicate that the latest symbol was a short match. */
|
||||||
|
static inline void lzma_state_short_rep(enum lzma_state *state)
|
||||||
|
{
|
||||||
|
*state = *state < LIT_STATES ? STATE_LIT_SHORTREP : STATE_NONLIT_REP;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Test if the previous symbol was a literal. */
|
||||||
|
static inline bool lzma_state_is_literal(enum lzma_state state)
|
||||||
|
{
|
||||||
|
return state < LIT_STATES;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Each literal coder is divided in three sections:
|
||||||
|
* - 0x001-0x0FF: Without match byte
|
||||||
|
* - 0x101-0x1FF: With match byte; match bit is 0
|
||||||
|
* - 0x201-0x2FF: With match byte; match bit is 1
|
||||||
|
*
|
||||||
|
* Match byte is used when the previous LZMA symbol was something else than
|
||||||
|
* a literal (that is, it was some kind of match).
|
||||||
|
*/
|
||||||
|
#define LITERAL_CODER_SIZE 0x300
|
||||||
|
|
||||||
|
/* Maximum number of literal coders */
|
||||||
|
#define LITERAL_CODERS_MAX (1 << 4)
|
||||||
|
|
||||||
|
/* Minimum length of a match is two bytes. */
|
||||||
|
#define MATCH_LEN_MIN 2
|
||||||
|
|
||||||
|
/* Match length is encoded with 4, 5, or 10 bits.
|
||||||
|
*
|
||||||
|
* Length Bits
|
||||||
|
* 2-9 4 = Choice=0 + 3 bits
|
||||||
|
* 10-17 5 = Choice=1 + Choice2=0 + 3 bits
|
||||||
|
* 18-273 10 = Choice=1 + Choice2=1 + 8 bits
|
||||||
|
*/
|
||||||
|
#define LEN_LOW_BITS 3
|
||||||
|
#define LEN_LOW_SYMBOLS (1 << LEN_LOW_BITS)
|
||||||
|
#define LEN_MID_BITS 3
|
||||||
|
#define LEN_MID_SYMBOLS (1 << LEN_MID_BITS)
|
||||||
|
#define LEN_HIGH_BITS 8
|
||||||
|
#define LEN_HIGH_SYMBOLS (1 << LEN_HIGH_BITS)
|
||||||
|
#define LEN_SYMBOLS (LEN_LOW_SYMBOLS + LEN_MID_SYMBOLS + LEN_HIGH_SYMBOLS)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Maximum length of a match is 273 which is a result of the encoding
|
||||||
|
* described above.
|
||||||
|
*/
|
||||||
|
#define MATCH_LEN_MAX (MATCH_LEN_MIN + LEN_SYMBOLS - 1)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Different sets of probabilities are used for match distances that have
|
||||||
|
* very short match length: Lengths of 2, 3, and 4 bytes have a separate
|
||||||
|
* set of probabilities for each length. The matches with longer length
|
||||||
|
* use a shared set of probabilities.
|
||||||
|
*/
|
||||||
|
#define DIST_STATES 4
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Get the index of the appropriate probability array for decoding
|
||||||
|
* the distance slot.
|
||||||
|
*/
|
||||||
|
static inline uint32_t lzma_get_dist_state(uint32_t len)
|
||||||
|
{
|
||||||
|
return len < DIST_STATES + MATCH_LEN_MIN
|
||||||
|
? len - MATCH_LEN_MIN : DIST_STATES - 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The highest two bits of a 32-bit match distance are encoded using six bits.
|
||||||
|
* This six-bit value is called a distance slot. This way encoding a 32-bit
|
||||||
|
* value takes 6-36 bits, larger values taking more bits.
|
||||||
|
*/
|
||||||
|
#define DIST_SLOT_BITS 6
|
||||||
|
#define DIST_SLOTS (1 << DIST_SLOT_BITS)
|
||||||
|
|
||||||
|
/* Match distances up to 127 are fully encoded using probabilities. Since
|
||||||
|
* the highest two bits (distance slot) are always encoded using six bits,
|
||||||
|
* the distances 0-3 don't need any additional bits to encode, since the
|
||||||
|
* distance slot itself is the same as the actual distance. DIST_MODEL_START
|
||||||
|
* indicates the first distance slot where at least one additional bit is
|
||||||
|
* needed.
|
||||||
|
*/
|
||||||
|
#define DIST_MODEL_START 4
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Match distances greater than 127 are encoded in three pieces:
|
||||||
|
* - distance slot: the highest two bits
|
||||||
|
* - direct bits: 2-26 bits below the highest two bits
|
||||||
|
* - alignment bits: four lowest bits
|
||||||
|
*
|
||||||
|
* Direct bits don't use any probabilities.
|
||||||
|
*
|
||||||
|
* The distance slot value of 14 is for distances 128-191.
|
||||||
|
*/
|
||||||
|
#define DIST_MODEL_END 14
|
||||||
|
|
||||||
|
/* Distance slots that indicate a distance <= 127. */
|
||||||
|
#define FULL_DISTANCES_BITS (DIST_MODEL_END / 2)
|
||||||
|
#define FULL_DISTANCES (1 << FULL_DISTANCES_BITS)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* For match distances greater than 127, only the highest two bits and the
|
||||||
|
* lowest four bits (alignment) is encoded using probabilities.
|
||||||
|
*/
|
||||||
|
#define ALIGN_BITS 4
|
||||||
|
#define ALIGN_SIZE (1 << ALIGN_BITS)
|
||||||
|
#define ALIGN_MASK (ALIGN_SIZE - 1)
|
||||||
|
|
||||||
|
/* Total number of all probability variables */
|
||||||
|
#define PROBS_TOTAL (1846 + LITERAL_CODERS_MAX * LITERAL_CODER_SIZE)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* LZMA remembers the four most recent match distances. Reusing these
|
||||||
|
* distances tends to take less space than re-encoding the actual
|
||||||
|
* distance value.
|
||||||
|
*/
|
||||||
|
#define REPS 4
|
||||||
|
|
||||||
|
#endif
|
|
@ -0,0 +1,156 @@
|
||||||
|
/*
|
||||||
|
* Private includes and definitions
|
||||||
|
*
|
||||||
|
* Author: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef XZ_PRIVATE_H
|
||||||
|
#define XZ_PRIVATE_H
|
||||||
|
|
||||||
|
#ifdef __KERNEL__
|
||||||
|
# include <linux/xz.h>
|
||||||
|
# include <linux/kernel.h>
|
||||||
|
# include <asm/unaligned.h>
|
||||||
|
/* XZ_PREBOOT may be defined only via decompress_unxz.c. */
|
||||||
|
# ifndef XZ_PREBOOT
|
||||||
|
# include <string.h>
|
||||||
|
# include <malloc.h>
|
||||||
|
# include <asm/byteorder.h>
|
||||||
|
# ifdef CONFIG_XZ_DEC_X86
|
||||||
|
# define XZ_DEC_X86
|
||||||
|
# endif
|
||||||
|
# ifdef CONFIG_XZ_DEC_POWERPC
|
||||||
|
# define XZ_DEC_POWERPC
|
||||||
|
# endif
|
||||||
|
# ifdef CONFIG_XZ_DEC_IA64
|
||||||
|
# define XZ_DEC_IA64
|
||||||
|
# endif
|
||||||
|
# ifdef CONFIG_XZ_DEC_ARM
|
||||||
|
# define XZ_DEC_ARM
|
||||||
|
# endif
|
||||||
|
# ifdef CONFIG_XZ_DEC_ARMTHUMB
|
||||||
|
# define XZ_DEC_ARMTHUMB
|
||||||
|
# endif
|
||||||
|
# ifdef CONFIG_XZ_DEC_SPARC
|
||||||
|
# define XZ_DEC_SPARC
|
||||||
|
# endif
|
||||||
|
# define memeq(a, b, size) (memcmp(a, b, size) == 0)
|
||||||
|
# define memzero(buf, size) memset(buf, 0, size)
|
||||||
|
# endif
|
||||||
|
# define get_le32(p) le32_to_cpup((const uint32_t *)(p))
|
||||||
|
#else
|
||||||
|
/*
|
||||||
|
* For userspace builds, use a separate header to define the required
|
||||||
|
* macros and functions. This makes it easier to adapt the code into
|
||||||
|
* different environments and avoids clutter in the Linux kernel tree.
|
||||||
|
*/
|
||||||
|
# include "xz_config.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* If no specific decoding mode is requested, enable support for all modes. */
|
||||||
|
#if !defined(XZ_DEC_SINGLE) && !defined(XZ_DEC_PREALLOC) \
|
||||||
|
&& !defined(XZ_DEC_DYNALLOC)
|
||||||
|
# define XZ_DEC_SINGLE
|
||||||
|
# define XZ_DEC_PREALLOC
|
||||||
|
# define XZ_DEC_DYNALLOC
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The DEC_IS_foo(mode) macros are used in "if" statements. If only some
|
||||||
|
* of the supported modes are enabled, these macros will evaluate to true or
|
||||||
|
* false at compile time and thus allow the compiler to omit unneeded code.
|
||||||
|
*/
|
||||||
|
#ifdef XZ_DEC_SINGLE
|
||||||
|
# define DEC_IS_SINGLE(mode) ((mode) == XZ_SINGLE)
|
||||||
|
#else
|
||||||
|
# define DEC_IS_SINGLE(mode) (false)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_PREALLOC
|
||||||
|
# define DEC_IS_PREALLOC(mode) ((mode) == XZ_PREALLOC)
|
||||||
|
#else
|
||||||
|
# define DEC_IS_PREALLOC(mode) (false)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_DYNALLOC
|
||||||
|
# define DEC_IS_DYNALLOC(mode) ((mode) == XZ_DYNALLOC)
|
||||||
|
#else
|
||||||
|
# define DEC_IS_DYNALLOC(mode) (false)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if !defined(XZ_DEC_SINGLE)
|
||||||
|
# define DEC_IS_MULTI(mode) (true)
|
||||||
|
#elif defined(XZ_DEC_PREALLOC) || defined(XZ_DEC_DYNALLOC)
|
||||||
|
# define DEC_IS_MULTI(mode) ((mode) != XZ_SINGLE)
|
||||||
|
#else
|
||||||
|
# define DEC_IS_MULTI(mode) (false)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ.
|
||||||
|
* XZ_DEC_BCJ is used to enable generic support for BCJ decoders.
|
||||||
|
*/
|
||||||
|
#ifndef XZ_DEC_BCJ
|
||||||
|
# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \
|
||||||
|
|| defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \
|
||||||
|
|| defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \
|
||||||
|
|| defined(XZ_DEC_SPARC)
|
||||||
|
# define XZ_DEC_BCJ
|
||||||
|
# endif
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
|
||||||
|
* before calling xz_dec_lzma2_run().
|
||||||
|
*/
|
||||||
|
XZ_EXTERN struct xz_dec_lzma2 *xz_dec_lzma2_create(enum xz_mode mode,
|
||||||
|
uint32_t dict_max);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Decode the LZMA2 properties (one byte) and reset the decoder. Return
|
||||||
|
* XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not
|
||||||
|
* big enough, and XZ_OPTIONS_ERROR if props indicates something that this
|
||||||
|
* decoder doesn't support.
|
||||||
|
*/
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_lzma2_reset(struct xz_dec_lzma2 *s,
|
||||||
|
uint8_t props);
|
||||||
|
|
||||||
|
/* Decode raw LZMA2 stream from b->in to b->out. */
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s,
|
||||||
|
struct xz_buf *b);
|
||||||
|
|
||||||
|
/* Free the memory allocated for the LZMA2 decoder. */
|
||||||
|
XZ_EXTERN void xz_dec_lzma2_end(struct xz_dec_lzma2 *s);
|
||||||
|
|
||||||
|
#ifdef XZ_DEC_BCJ
|
||||||
|
/*
|
||||||
|
* Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before
|
||||||
|
* calling xz_dec_bcj_run().
|
||||||
|
*/
|
||||||
|
XZ_EXTERN struct xz_dec_bcj *xz_dec_bcj_create(bool single_call);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Decode the Filter ID of a BCJ filter. This implementation doesn't
|
||||||
|
* support custom start offsets, so no decoding of Filter Properties
|
||||||
|
* is needed. Returns XZ_OK if the given Filter ID is supported.
|
||||||
|
* Otherwise XZ_OPTIONS_ERROR is returned.
|
||||||
|
*/
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Decode raw BCJ + LZMA2 stream. This must be used only if there actually is
|
||||||
|
* a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run()
|
||||||
|
* must be called directly.
|
||||||
|
*/
|
||||||
|
XZ_EXTERN enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s,
|
||||||
|
struct xz_dec_lzma2 *lzma2,
|
||||||
|
struct xz_buf *b);
|
||||||
|
|
||||||
|
/* Free the memory allocated for the BCJ filters. */
|
||||||
|
#define xz_dec_bcj_end(s) kfree(s)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
|
@ -0,0 +1,61 @@
|
||||||
|
/*
|
||||||
|
* Definitions for handling the .xz file format
|
||||||
|
*
|
||||||
|
* Author: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
*
|
||||||
|
* This file has been put into the public domain.
|
||||||
|
* You can do whatever you want with this file.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef XZ_STREAM_H
|
||||||
|
#define XZ_STREAM_H
|
||||||
|
|
||||||
|
#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
|
||||||
|
# undef crc32
|
||||||
|
# define xz_crc32(buf, size, crc) \
|
||||||
|
(~crc32_le(~(uint32_t)(crc), buf, size))
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* See the .xz file format specification at
|
||||||
|
* http://tukaani.org/xz/xz-file-format.txt
|
||||||
|
* to understand the container format.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#define STREAM_HEADER_SIZE 12
|
||||||
|
|
||||||
|
#define HEADER_MAGIC "\3757zXZ"
|
||||||
|
#define HEADER_MAGIC_SIZE 6
|
||||||
|
|
||||||
|
#define FOOTER_MAGIC "YZ"
|
||||||
|
#define FOOTER_MAGIC_SIZE 2
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Variable-length integer can hold a 63-bit unsigned integer or a special
|
||||||
|
* value indicating that the value is unknown.
|
||||||
|
*
|
||||||
|
* Experimental: vli_type can be defined to uint32_t to save a few bytes
|
||||||
|
* in code size (no effect on speed). Doing so limits the uncompressed and
|
||||||
|
* compressed size of the file to less than 256 MiB and may also weaken
|
||||||
|
* error detection slightly.
|
||||||
|
*/
|
||||||
|
typedef uint64_t vli_type;
|
||||||
|
|
||||||
|
#define VLI_MAX ((vli_type)-1 / 2)
|
||||||
|
#define VLI_UNKNOWN ((vli_type)-1)
|
||||||
|
|
||||||
|
/* Maximum encoded size of a VLI */
|
||||||
|
#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
|
||||||
|
|
||||||
|
/* Integrity Check types */
|
||||||
|
enum xz_check {
|
||||||
|
XZ_CHECK_NONE = 0,
|
||||||
|
XZ_CHECK_CRC32 = 1,
|
||||||
|
XZ_CHECK_CRC64 = 4,
|
||||||
|
XZ_CHECK_SHA256 = 10
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Maximum possible Check ID */
|
||||||
|
#define XZ_CHECK_MAX 15
|
||||||
|
|
||||||
|
#endif
|
|
@ -64,6 +64,9 @@ config IMAGE_COMPRESSION_LZO
|
||||||
config IMAGE_COMPRESSION_GZIP
|
config IMAGE_COMPRESSION_GZIP
|
||||||
bool "gzip"
|
bool "gzip"
|
||||||
|
|
||||||
|
config IMAGE_COMPRESSION_XZKERN
|
||||||
|
bool "xz"
|
||||||
|
|
||||||
config IMAGE_COMPRESSION_NONE
|
config IMAGE_COMPRESSION_NONE
|
||||||
bool "none"
|
bool "none"
|
||||||
|
|
||||||
|
|
|
@ -22,6 +22,10 @@
|
||||||
#include "../../../lib/decompress_inflate.c"
|
#include "../../../lib/decompress_inflate.c"
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
|
#ifdef CONFIG_IMAGE_COMPRESSION_XZKERN
|
||||||
|
#include "../../../lib/decompress_unxz.c"
|
||||||
|
#endif
|
||||||
|
|
||||||
#ifdef CONFIG_IMAGE_COMPRESSION_NONE
|
#ifdef CONFIG_IMAGE_COMPRESSION_NONE
|
||||||
STATIC int decompress(u8 *input, int in_len,
|
STATIC int decompress(u8 *input, int in_len,
|
||||||
int (*fill) (void *, unsigned int),
|
int (*fill) (void *, unsigned int),
|
||||||
|
|
|
@ -205,6 +205,37 @@ cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
|
||||||
%.gz: %
|
%.gz: %
|
||||||
$(call if_changed,gzip)
|
$(call if_changed,gzip)
|
||||||
|
|
||||||
|
# XZ
|
||||||
|
# ---------------------------------------------------------------------------
|
||||||
|
# Use xzkern to compress the kernel image and xzmisc to compress other things.
|
||||||
|
#
|
||||||
|
# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
|
||||||
|
# of the kernel decompressor. A BCJ filter is used if it is available for
|
||||||
|
# the target architecture. xzkern also appends uncompressed size of the data
|
||||||
|
# using size_append. The .xz format has the size information available at
|
||||||
|
# the end of the file too, but it's in more complex format and it's good to
|
||||||
|
# avoid changing the part of the boot code that reads the uncompressed size.
|
||||||
|
# Note that the bytes added by size_append will make the xz tool think that
|
||||||
|
# the file is corrupt. This is expected.
|
||||||
|
#
|
||||||
|
# xzmisc doesn't use size_append, so it can be used to create normal .xz
|
||||||
|
# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
|
||||||
|
# big dictionary would increase the memory usage too much in the multi-call
|
||||||
|
# decompression mode. A BCJ filter isn't used either.
|
||||||
|
quiet_cmd_xzkern = XZKERN $@
|
||||||
|
cmd_xzkern = (cat $(filter-out FORCE,$^) | \
|
||||||
|
sh $(srctree)/scripts/xz_wrap.sh && \
|
||||||
|
$(call size_append, $(filter-out FORCE,$^))) > $@ || \
|
||||||
|
(rm -f $@ ; false)
|
||||||
|
|
||||||
|
quiet_cmd_xzmisc = XZMISC $@
|
||||||
|
cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
|
||||||
|
xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
|
||||||
|
(rm -f $@ ; false)
|
||||||
|
|
||||||
|
%.xzkern: %
|
||||||
|
$(call if_changed,xzkern)
|
||||||
|
|
||||||
# DTC
|
# DTC
|
||||||
# ---------------------------------------------------------------------------
|
# ---------------------------------------------------------------------------
|
||||||
|
|
||||||
|
|
|
@ -0,0 +1,23 @@
|
||||||
|
#!/bin/sh
|
||||||
|
#
|
||||||
|
# This is a wrapper for xz to compress the kernel image using appropriate
|
||||||
|
# compression options depending on the architecture.
|
||||||
|
#
|
||||||
|
# Author: Lasse Collin <lasse.collin@tukaani.org>
|
||||||
|
#
|
||||||
|
# This file has been put into the public domain.
|
||||||
|
# You can do whatever you want with this file.
|
||||||
|
#
|
||||||
|
|
||||||
|
BCJ=
|
||||||
|
LZMA2OPTS=
|
||||||
|
|
||||||
|
case $SRCARCH in
|
||||||
|
x86) BCJ=--x86 ;;
|
||||||
|
powerpc) BCJ=--powerpc ;;
|
||||||
|
ia64) BCJ=--ia64; LZMA2OPTS=pb=4 ;;
|
||||||
|
arm) BCJ=--arm ;;
|
||||||
|
sparc) BCJ=--sparc ;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
exec xz --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
|
Loading…
Reference in New Issue