103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief Handle unaligned data access
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*/
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#ifndef _ASTERISK_UNALIGNED_H
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#define _ASTERISK_UNALIGNED_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#ifdef __GNUC__
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/* If we just tell GCC what's going on, we can trust it to behave optimally */
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static inline unsigned int get_unaligned_uint32(void *p)
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{
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struct { unsigned int d; } __attribute__((packed)) *pp = (void *)p;
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return pp->d;
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}
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static inline unsigned short get_unaligned_uint16(void *p)
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{
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struct { unsigned short d; } __attribute__((packed)) *pp = (void *)p;
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return pp->d;
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}
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static inline void put_unaligned_uint32(void *p, unsigned int datum)
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{
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struct { unsigned int d; } __attribute__((packed)) *pp = (void *)p;
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pp->d = datum;
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}
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static inline void put_unaligned_uint16(void *p, unsigned short datum)
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{
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struct { unsigned short d; } __attribute__((packed)) *pp = (void *)p;
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pp->d = datum;
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}
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#elif defined(SOLARIS) && defined(__sparc__)
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static inline unsigned int get_unaligned_uint32(void *p)
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{
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unsigned char *cp = p;
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return (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
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}
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static inline unsigned short get_unaligned_uint16(void *p)
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{
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unsigned char *cp = p;
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return (cp[0] << 8) | cp[1] ;
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}
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static inline void put_unaligned_uint32(void *p, unsigned int datum)
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{
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unsigned char *cp = p;
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cp[0] = datum >> 24;
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cp[1] = datum >> 16;
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cp[2] = datum >> 8;
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cp[3] = datum;
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}
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static inline void put_unaligned_uint16(void *p, unsigned int datum)
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{
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unsigned char *cp = p;
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cp[0] = datum >> 8;
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cp[1] = datum;
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}
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#else /* Not GCC, not Solaris/SPARC. Assume we can handle direct load/store. */
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#define get_unaligned_uint32(p) (*((unsigned int *)(p)))
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#define get_unaligned_uint16(p) (*((unsigned short *)(p)))
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#define put_unaligned_uint32(p,d) do { unsigned int *__P = (p); *__P = d; } while(0)
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#define put_unaligned_uint16(p,d) do { unsigned short *__P = (p); *__P = d; } while(0)
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#endif
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* _ASTERISK_UNALIGNED_H */
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