* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
+#include <stdlib.h>
#include "vpx_ports/mem.h"
#include "vpx_mem/vpx_mem.h"
+#include "./vpx_config.h"
#include "vp9/decoder/vp9_reader.h"
+#include "vpx_util/endian_inl.h"
+
+#if CONFIG_BIG_ENDIAN
+#define BIGENDIFY64(X) (X)
+#define BIGENDIFY32(X) (X)
+#else
+#define BIGENDIFY64(X) BSwap64(X)
+#define BIGENDIFY32(X) BSwap32(X)
+#endif
+
int vp9_reader_init(vp9_reader *r,
const uint8_t *buffer,
size_t size,
const uint8_t *buffer_start = buffer;
BD_VALUE value = r->value;
int count = r->count;
- int shift = BD_VALUE_SIZE - CHAR_BIT - (count + CHAR_BIT);
- int loop_end = 0;
const size_t bytes_left = buffer_end - buffer;
const size_t bits_left = bytes_left * CHAR_BIT;
- const int x = (int)(shift + CHAR_BIT - bits_left);
+ int shift = BD_VALUE_SIZE - CHAR_BIT - (count + CHAR_BIT);
if (r->decrypt_cb) {
size_t n = MIN(sizeof(r->clear_buffer), bytes_left);
buffer = r->clear_buffer;
buffer_start = r->clear_buffer;
}
+ if (bits_left > BD_VALUE_SIZE) {
+#if UINTPTR_MAX == 0xffffffffffffffff
+ BD_VALUE big_endian_values = BIGENDIFY64(*((const BD_VALUE *) buffer));
+#else
+ BD_VALUE big_endian_values = BIGENDIFY32(*((const BD_VALUE *) buffer));
+#endif
+ const int bits = (shift & 0xfffffff8) + CHAR_BIT;
+ const BD_VALUE nv = big_endian_values >> (BD_VALUE_SIZE - bits);
+ count += bits;
+ buffer += (bits >> 3);
+ value = r->value | (nv << (shift & 0x7));
+ } else {
+ const int bits_over = (int)(shift + CHAR_BIT - bits_left);
+ int loop_end = 0;
+ if (bits_over >= 0) {
+ count += LOTS_OF_BITS;
+ loop_end = bits_over;
+ }
- if (x >= 0) {
- count += LOTS_OF_BITS;
- loop_end = x;
- }
-
- if (x < 0 || bits_left) {
- while (shift >= loop_end) {
- count += CHAR_BIT;
- value |= (BD_VALUE)*buffer++ << shift;
- shift -= CHAR_BIT;
+ if (bits_over < 0 || bits_left) {
+ while (shift >= loop_end) {
+ count += CHAR_BIT;
+ value |= (BD_VALUE)*buffer++ << shift;
+ shift -= CHAR_BIT;
+ }
}
}
--- /dev/null
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Endian related functions.
+
+#ifndef VPX_UTIL_ENDIAN_INL_H_
+#define VPX_UTIL_ENDIAN_INL_H_
+
+#include <stdlib.h>
+#include "./vpx_config.h"
+#include "vpx/vpx_integer.h"
+
+#if defined(__GNUC__)
+# define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
+# define LOCAL_GCC_PREREQ(maj, min) \
+ (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
+#else
+# define LOCAL_GCC_VERSION 0
+# define LOCAL_GCC_PREREQ(maj, min) 0
+#endif
+
+#ifdef __clang__
+# define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__)
+# define LOCAL_CLANG_PREREQ(maj, min) \
+ (LOCAL_CLANG_VERSION >= (((maj) << 8) | (min)))
+#else
+# define LOCAL_CLANG_VERSION 0
+# define LOCAL_CLANG_PREREQ(maj, min) 0
+#endif // __clang__
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(WORDS_BIGENDIAN) && \
+ (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
+ (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
+#define WORDS_BIGENDIAN
+#endif
+
+#if defined(WORDS_BIGENDIAN)
+#define HToLE32 BSwap32
+#define HToLE16 BSwap16
+#else
+#define HToLE32(x) (x)
+#define HToLE16(x) (x)
+#endif
+
+// clang-3.3 and gcc-4.3 have builtin functions for swap32/swap64
+#if LOCAL_GCC_PREREQ(4, 3) || LOCAL_CLANG_PREREQ(3, 3)
+#define HAVE_BUILTIN_BSWAP32
+#define HAVE_BUILTIN_BSWAP64
+#endif
+// clang-3.3 and gcc-4.8 have a builtin function for swap16
+#if LOCAL_GCC_PREREQ(4, 8) || LOCAL_CLANG_PREREQ(3, 3)
+#define HAVE_BUILTIN_BSWAP16
+#endif
+
+static INLINE uint16_t BSwap16(uint16_t x) {
+#if defined(HAVE_BUILTIN_BSWAP16)
+ return __builtin_bswap16(x);
+#elif defined(_MSC_VER)
+ return _byteswap_ushort(x);
+#else
+ // gcc will recognize a 'rorw $8, ...' here:
+ return (x >> 8) | ((x & 0xff) << 8);
+#endif // HAVE_BUILTIN_BSWAP16
+}
+
+static INLINE uint32_t BSwap32(uint32_t x) {
+#if HAVE_MIPS32
+ uint32_t ret;
+ __asm__ volatile (
+ "wsbh %[ret], %[x] \n\t"
+ "rotr %[ret], %[ret], 16 \n\t"
+ : [ret]"=r"(ret)
+ : [x]"r"(x)
+ );
+ return ret;
+#elif defined(HAVE_BUILTIN_BSWAP32)
+ return __builtin_bswap32(x);
+#elif defined(__i386__) || defined(__x86_64__)
+ uint32_t swapped_bytes;
+ __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint32_t)_byteswap_ulong(x);
+#else
+ return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
+#endif // HAVE_BUILTIN_BSWAP32
+}
+
+static INLINE uint64_t BSwap64(uint64_t x) {
+#if defined(HAVE_BUILTIN_BSWAP64)
+ return __builtin_bswap64(x);
+#elif defined(__x86_64__)
+ uint64_t swapped_bytes;
+ __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint64_t)_byteswap_uint64(x);
+#else // generic code for swapping 64-bit values (suggested by bdb@)
+ x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
+ x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
+ x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
+ return x;
+#endif // HAVE_BUILTIN_BSWAP64
+}
+
+#endif // VPX_UTIL_ENDIAN_INL_H_
projects / platform / upstream / libvpx.git / commitdiff