AOMedia Codec SDK
aom_integer.h
1/*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11#ifndef AOM_AOM_AOM_INTEGER_H_
12#define AOM_AOM_AOM_INTEGER_H_
13
14/* get ptrdiff_t, size_t, wchar_t, NULL */
15#include <stddef.h>
16
17#if defined(_MSC_VER)
18#define AOM_FORCE_INLINE __forceinline
19#define AOM_INLINE __inline
20#else
21#define AOM_FORCE_INLINE __inline__ __attribute__((always_inline))
22// TODO(jbb): Allow a way to force inline off for older compilers.
23#define AOM_INLINE inline
24#endif
25
26#if defined(AOM_EMULATE_INTTYPES)
27typedef signed char int8_t;
28typedef signed short int16_t;
29typedef signed int int32_t;
30
31typedef unsigned char uint8_t;
32typedef unsigned short uint16_t;
33typedef unsigned int uint32_t;
34
35#ifndef _UINTPTR_T_DEFINED
36typedef size_t uintptr_t;
37#endif
38
39#else
40
41/* Most platforms have the C99 standard integer types. */
42
43#if defined(__cplusplus)
44#if !defined(__STDC_FORMAT_MACROS)
45#define __STDC_FORMAT_MACROS
46#endif
47#if !defined(__STDC_LIMIT_MACROS)
48#define __STDC_LIMIT_MACROS
49#endif
50#endif // __cplusplus
51
52#include <stdint.h>
53
54#endif
55
56/* VS2010 defines stdint.h, but not inttypes.h */
57#if defined(_MSC_VER) && _MSC_VER < 1800
58#define PRId64 "I64d"
59#else
60#include <inttypes.h>
61#endif
62
63#if !defined(INT8_MAX)
64#define INT8_MAX 127
65#endif
66
67#if !defined(INT32_MAX)
68#define INT32_MAX 2147483647
69#endif
70
71#if !defined(INT32_MIN)
72#define INT32_MIN (-2147483647 - 1)
73#endif
74
75#define NELEMENTS(x) (int)(sizeof(x) / sizeof(x[0]))
76
77#if defined(__cplusplus)
78extern "C" {
79#endif // __cplusplus
80
81// Returns size of uint64_t when encoded using LEB128.
82size_t aom_uleb_size_in_bytes(uint64_t value);
83
84// Returns 0 on success, -1 on decode failure.
85// On success, 'value' stores the decoded LEB128 value and 'length' stores
86// the number of bytes decoded.
87int aom_uleb_decode(const uint8_t *buffer, size_t available, uint64_t *value,
88 size_t *length);
89
90// Encodes LEB128 integer. Returns 0 when successful, and -1 upon failure.
91int aom_uleb_encode(uint64_t value, size_t available, uint8_t *coded_value,
92 size_t *coded_size);
93
94// Encodes LEB128 integer to size specified. Returns 0 when successful, and -1
95// upon failure.
96// Note: This will write exactly pad_to_size bytes; if the value cannot be
97// encoded in this many bytes, then this will fail.
98int aom_uleb_encode_fixed_size(uint64_t value, size_t available,
99 size_t pad_to_size, uint8_t *coded_value,
100 size_t *coded_size);
101
102#if defined(__cplusplus)
103} // extern "C"
104#endif // __cplusplus
105
106#endif // AOM_AOM_AOM_INTEGER_H_