forked from len0rd/rockbox
cadb3627fc
librbcodec users must provide these two files when the library is built. rbcodecconfig.h provides configuration #defines and basic types, and will be included by public librbcodec headers, so it must not conflict with the user's code. rbcodecplatform.h provides various OS functions, and will only be included by source files and private headers. This system is intended to provide maximum flexibility for use on embedded systems, where no operating system headers are included. Unix systems can just copy rbcodecconfig-example.h and rbcodecplatform-unix.h with minimal changes. Change-Id: I350a2274d173da391fd1ca00c4202e9760d91def Reviewed-on: http://gerrit.rockbox.org/143 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
174 lines
3.3 KiB
C
174 lines
3.3 KiB
C
/**
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* @file bswap.h
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* byte swap.
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*/
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#ifndef __BSWAP_H__
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#define __BSWAP_H__
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#include "platform.h"
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#ifndef bswap_16
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#define bswap_16(x) swap16(x)
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#endif
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#ifndef bswap_32
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#define bswap_32(x) swap32(x)
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#endif
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#ifndef bswap_64
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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struct {
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uint32_t l,h;
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} l;
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} r;
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r.l.l = bswap_32 (x);
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r.l.h = bswap_32 (x>>32);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#endif
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#if 0
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#ifdef HAVE_BYTESWAP_H
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#include <byteswap.h>
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#else
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#ifdef ROCKBOX
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#include "codecs.h"
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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struct {
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uint32_t l,h;
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} l;
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} r;
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r.l.l = bswap_32 (x);
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r.l.h = bswap_32 (x>>32);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#elif defined(ARCH_X86)
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static inline unsigned short ByteSwap16(unsigned short x)
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{
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__asm("xchgb %b0,%h0" :
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"=q" (x) :
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"0" (x));
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return x;
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}
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#define bswap_16(x) ByteSwap16(x)
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static inline unsigned int ByteSwap32(unsigned int x)
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{
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#if __CPU__ > 386
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__asm("bswap %0":
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"=r" (x) :
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#else
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__asm("xchgb %b0,%h0\n"
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" rorl $16,%0\n"
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" xchgb %b0,%h0":
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"=q" (x) :
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#endif
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"0" (x));
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return x;
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}
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#define bswap_32(x) ByteSwap32(x)
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static inline unsigned long long int ByteSwap64(unsigned long long int x)
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{
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register union { __extension__ uint64_t __ll;
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uint32_t __l[2]; } __x;
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asm("xchgl %0,%1":
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"=r"(__x.__l[0]),"=r"(__x.__l[1]):
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"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
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return __x.__ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#elif defined(ARCH_SH4)
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static inline uint16_t ByteSwap16(uint16_t x) {
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__asm__("swap.b %0,%0":"=r"(x):"0"(x));
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return x;
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}
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static inline uint32_t ByteSwap32(uint32_t x) {
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__asm__(
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"swap.b %0,%0\n"
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"swap.w %0,%0\n"
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"swap.b %0,%0\n"
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:"=r"(x):"0"(x));
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return x;
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}
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#define bswap_16(x) ByteSwap16(x)
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#define bswap_32(x) ByteSwap32(x)
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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struct {
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uint32_t l,h;
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} l;
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} r;
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r.l.l = bswap_32 (x);
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r.l.h = bswap_32 (x>>32);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#else
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#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
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// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
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#define bswap_32(x) \
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((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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uint32_t l[2];
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} w, r;
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w.ll = x;
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r.l[0] = bswap_32 (w.l[1]);
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r.l[1] = bswap_32 (w.l[0]);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#endif /* !ARCH_X86 */
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#endif /* !HAVE_BYTESWAP_H */
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#endif
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// be2me ... BigEndian to MachineEndian
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// le2me ... LittleEndian to MachineEndian
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#ifdef ROCKBOX_BIG_ENDIAN
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#define be2me_16(x) (x)
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#define be2me_32(x) (x)
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#define be2me_64(x) (x)
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#define le2me_16(x) bswap_16(x)
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#define le2me_32(x) bswap_32(x)
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#define le2me_64(x) bswap_64(x)
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#else
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#define be2me_16(x) bswap_16(x)
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#define be2me_32(x) bswap_32(x)
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#define be2me_64(x) bswap_64(x)
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#define le2me_16(x) (x)
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#define le2me_32(x) (x)
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#define le2me_64(x) (x)
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#endif
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#endif /* __BSWAP_H__ */
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