100 lines
3 KiB
C++
100 lines
3 KiB
C++
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Endian related functions.
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#ifndef WEBP_UTILS_ENDIAN_INL_H_
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#define WEBP_UTILS_ENDIAN_INL_H_
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#ifdef HAVE_CONFIG_H
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#include "../webp/config.h"
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#endif
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#include "../dsp/dsp.h"
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#include "../webp/types.h"
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// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
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#if !defined(WORDS_BIGENDIAN) && \
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(defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
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(defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
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#define WORDS_BIGENDIAN
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#endif
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#if defined(WORDS_BIGENDIAN)
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#define HToLE32 BSwap32
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#define HToLE16 BSwap16
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#else
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#define HToLE32(x) (x)
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#define HToLE16(x) (x)
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#endif
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#if !defined(HAVE_CONFIG_H)
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#if LOCAL_GCC_PREREQ(4,8) || __has_builtin(__builtin_bswap16)
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#define HAVE_BUILTIN_BSWAP16
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#endif
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#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap32)
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#define HAVE_BUILTIN_BSWAP32
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#endif
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#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap64)
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#define HAVE_BUILTIN_BSWAP64
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#endif
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#endif // !HAVE_CONFIG_H
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static WEBP_INLINE uint16_t BSwap16(uint16_t x) {
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#if defined(HAVE_BUILTIN_BSWAP16)
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return __builtin_bswap16(x);
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#elif defined(_MSC_VER)
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return _byteswap_ushort(x);
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#else
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// gcc will recognize a 'rorw $8, ...' here:
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return (x >> 8) | ((x & 0xff) << 8);
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#endif // HAVE_BUILTIN_BSWAP16
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}
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static WEBP_INLINE uint32_t BSwap32(uint32_t x) {
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#if defined(WEBP_USE_MIPS32_R2)
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uint32_t ret;
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__asm__ volatile (
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"wsbh %[ret], %[x] \n\t"
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"rotr %[ret], %[ret], 16 \n\t"
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: [ret]"=r"(ret)
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: [x]"r"(x)
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);
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return ret;
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#elif defined(HAVE_BUILTIN_BSWAP32)
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return __builtin_bswap32(x);
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#elif defined(__i386__) || defined(__x86_64__)
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uint32_t swapped_bytes;
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__asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
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return swapped_bytes;
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#elif defined(_MSC_VER)
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return (uint32_t)_byteswap_ulong(x);
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#else
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return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
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#endif // HAVE_BUILTIN_BSWAP32
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}
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static WEBP_INLINE uint64_t BSwap64(uint64_t x) {
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#if defined(HAVE_BUILTIN_BSWAP64)
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return __builtin_bswap64(x);
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#elif defined(__x86_64__)
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uint64_t swapped_bytes;
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__asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
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return swapped_bytes;
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#elif defined(_MSC_VER)
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return (uint64_t)_byteswap_uint64(x);
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#else // generic code for swapping 64-bit values (suggested by bdb@)
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x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
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x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
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x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
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return x;
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#endif // HAVE_BUILTIN_BSWAP64
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}
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#endif // WEBP_UTILS_ENDIAN_INL_H_
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