221 lines
6.3 KiB
Diff
221 lines
6.3 KiB
Diff
Add LZO support to mtd-utils to generate LZO compressed jffs2 images
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Unlike the kernel version, the standard lzo userspace library is used
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along with lzo1x_999_compress rather than the lzo1x_1_compress version
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since better compression ratios can be obtained (at no significant cost
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to decompression time).
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Signed-off-by: Richard Purdie <rpurdie@openedhand.com>
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---
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Makefile | 3 -
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compr.c | 6 ++
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compr.h | 6 ++
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compr_lzo.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++
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include/linux/jffs2.h | 1
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5 files changed, 135 insertions(+), 1 deletion(-)
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Index: git/Makefile
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===================================================================
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--- git.orig/Makefile 2007-03-01 11:57:58.000000000 +0000
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+++ git/Makefile 2007-03-01 11:58:01.000000000 +0000
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@@ -58,8 +58,9 @@ $(BUILDDIR)/mkfs.jffs2: $(BUILDDIR)/crc3
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$(BUILDDIR)/compr_rtime.o \
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$(BUILDDIR)/mkfs.jffs2.o \
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$(BUILDDIR)/compr_zlib.o \
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+ $(BUILDDIR)/compr_lzo.o \
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$(BUILDDIR)/compr.o
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- $(CC) $(LDFLAGS) -o $@ $^ -lz
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+ $(CC) $(LDFLAGS) -o $@ $^ -lz -llzo
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$(BUILDDIR)/flash_eraseall: $(BUILDDIR)/crc32.o $(BUILDDIR)/flash_eraseall.o
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$(CC) $(LDFLAGS) -o $@ $^
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Index: git/compr.c
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===================================================================
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--- git.orig/compr.c 2007-03-01 11:57:58.000000000 +0000
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+++ git/compr.c 2007-03-01 11:58:01.000000000 +0000
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@@ -474,6 +474,9 @@ int jffs2_compressors_init(void)
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#ifdef CONFIG_JFFS2_RTIME
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jffs2_rtime_init();
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#endif
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+#ifdef CONFIG_JFFS2_LZO
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+ jffs2_lzo_init();
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+#endif
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return 0;
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}
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@@ -485,5 +488,8 @@ int jffs2_compressors_exit(void)
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#ifdef CONFIG_JFFS2_ZLIB
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jffs2_zlib_exit();
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#endif
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+#ifdef CONFIG_JFFS2_LZO
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+ jffs2_lzo_exit();
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+#endif
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return 0;
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}
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Index: git/compr.h
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===================================================================
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--- git.orig/compr.h 2007-03-01 11:57:58.000000000 +0000
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+++ git/compr.h 2007-03-01 11:58:01.000000000 +0000
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@@ -21,11 +21,13 @@
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#define CONFIG_JFFS2_ZLIB
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#define CONFIG_JFFS2_RTIME
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+#define CONFIG_JFFS2_LZO
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#define JFFS2_RUBINMIPS_PRIORITY 10
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#define JFFS2_DYNRUBIN_PRIORITY 20
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#define JFFS2_RTIME_PRIORITY 50
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#define JFFS2_ZLIB_PRIORITY 60
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+#define JFFS2_LZO_PRIORITY 80
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#define JFFS2_COMPR_MODE_NONE 0
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#define JFFS2_COMPR_MODE_PRIORITY 1
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@@ -111,5 +113,9 @@ void jffs2_zlib_exit(void);
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int jffs2_rtime_init(void);
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void jffs2_rtime_exit(void);
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#endif
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+#ifdef CONFIG_JFFS2_LZO
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+int jffs2_lzo_init(void);
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+void jffs2_lzo_exit(void);
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+#endif
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#endif /* __JFFS2_COMPR_H__ */
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Index: git/compr_lzo.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ git/compr_lzo.c 2007-03-01 11:58:01.000000000 +0000
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@@ -0,0 +1,120 @@
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+/*
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+ * JFFS2 LZO Compression Interface.
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+ *
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+ * Copyright (C) 2007 Nokia Corporation. All rights reserved.
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+ *
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+ * Author: Richard Purdie <rpurdie@openedhand.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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+ * 02110-1301 USA
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+ *
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+ */
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+
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+#include <stdint.h>
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+#include <stdio.h>
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+#include <string.h>
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+#include <asm/types.h>
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+#include <linux/jffs2.h>
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+#include <lzo1x.h>
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+#include "compr.h"
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+
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+extern int page_size;
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+
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+static void *lzo_mem;
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+static void *lzo_compress_buf;
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+
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+/*
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+ * Note about LZO compression.
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+ *
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+ * We want to use the _999_ compression routine which gives better compression
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+ * rates at the expense of time. Decompression time is unaffected. We might as
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+ * well use the standard lzo library routines for this but they will overflow
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+ * the destination buffer since they don't check the destination size.
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+ *
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+ * We therefore compress to a temporary buffer and copy if it will fit.
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+ *
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+ */
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+static int jffs2_lzo_cmpr(unsigned char *data_in, unsigned char *cpage_out,
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+ uint32_t *sourcelen, uint32_t *dstlen, void *model)
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+{
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+ uint32_t compress_size;
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+ int ret;
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+
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+ ret = lzo1x_999_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
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+
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+ if (ret != LZO_E_OK)
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+ return -1;
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+
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+ if (compress_size > *dstlen)
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+ return -1;
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+
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+ memcpy(cpage_out, lzo_compress_buf, compress_size);
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+ *dstlen = compress_size;
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+
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+ return 0;
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+}
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+
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+static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
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+ uint32_t srclen, uint32_t destlen, void *model)
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+{
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+ int ret;
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+ uint32_t dl;
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+
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+ ret = lzo1x_decompress_safe(data_in,srclen,cpage_out,&dl,NULL);
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+
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+ if (ret != LZO_E_OK || dl != destlen)
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+ return -1;
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+
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+ return 0;
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+}
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+
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+static struct jffs2_compressor jffs2_lzo_comp = {
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+ .priority = JFFS2_LZO_PRIORITY,
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+ .name = "lzo",
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+ .compr = JFFS2_COMPR_LZO,
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+ .compress = &jffs2_lzo_cmpr,
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+ .decompress = &jffs2_lzo_decompress,
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+ .disabled = 0,
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+};
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+
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+int jffs2_lzo_init(void)
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+{
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+ int ret;
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+
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+ lzo_mem = malloc(LZO1X_999_MEM_COMPRESS);
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+ if (!lzo_mem)
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+ return -1;
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+
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+ /* Worse case LZO compression size from their FAQ */
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+ lzo_compress_buf = malloc(page_size + (page_size / 64) + 16 + 3);
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+ if (!lzo_compress_buf) {
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+ free(lzo_mem);
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+ return -1;
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+ }
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+
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+ ret = jffs2_register_compressor(&jffs2_lzo_comp);
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+ if (ret < 0) {
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+ free(lzo_compress_buf);
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+ free(lzo_mem);
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+ }
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+
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+ return ret;
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+}
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+
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+void jffs2_lzo_exit(void)
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+{
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+ jffs2_unregister_compressor(&jffs2_lzo_comp);
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+ free(lzo_compress_buf);
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+ free(lzo_mem);
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+}
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Index: git/include/linux/jffs2.h
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===================================================================
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--- git.orig/include/linux/jffs2.h 2007-03-01 11:57:58.000000000 +0000
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+++ git/include/linux/jffs2.h 2007-03-01 11:58:01.000000000 +0000
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@@ -46,6 +46,7 @@
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#define JFFS2_COMPR_COPY 0x04
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#define JFFS2_COMPR_DYNRUBIN 0x05
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#define JFFS2_COMPR_ZLIB 0x06
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+#define JFFS2_COMPR_LZO 0x07
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/* Compatibility flags. */
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#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */
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#define JFFS2_NODE_ACCURATE 0x2000
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