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) 27 typedef signed char int8_t; 28 typedef signed short int16_t; 29 typedef signed int int32_t; 30 31 typedef unsigned char uint8_t; 32 typedef unsigned short uint16_t; 33 typedef unsigned int uint32_t; 34 35 #ifndef _UINTPTR_T_DEFINED 36 typedef 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) 78 extern "C" { 79 #endif // __cplusplus 80 81 // Returns size of uint64_t when encoded using LEB128. 82 size_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. 87 int 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. 91 int 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. 98 int 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_ 107