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 #define AOM_INLINE inline 23 #endif 24 25 /* Assume platforms have the C99 standard integer types. */ 26 27 #if defined(__cplusplus) 28 #if !defined(__STDC_FORMAT_MACROS) 29 #define __STDC_FORMAT_MACROS 30 #endif 31 #if !defined(__STDC_LIMIT_MACROS) 32 #define __STDC_LIMIT_MACROS 33 #endif 34 #endif // __cplusplus 35 36 #include <stdint.h> 37 #include <inttypes.h> 38 39 #if defined(__cplusplus) 40 extern "C" { 41 #endif // __cplusplus 42 43 // Returns size of uint64_t when encoded using LEB128. 44 size_t aom_uleb_size_in_bytes(uint64_t value); 45 46 // Returns 0 on success, -1 on decode failure. 47 // On success, 'value' stores the decoded LEB128 value and 'length' stores 48 // the number of bytes decoded. 49 int aom_uleb_decode(const uint8_t *buffer, size_t available, uint64_t *value, 50 size_t *length); 51 52 // Encodes LEB128 integer. Returns 0 when successful, and -1 upon failure. 53 int aom_uleb_encode(uint64_t value, size_t available, uint8_t *coded_value, 54 size_t *coded_size); 55 56 // Encodes LEB128 integer to size specified. Returns 0 when successful, and -1 57 // upon failure. 58 // Note: This will write exactly pad_to_size bytes; if the value cannot be 59 // encoded in this many bytes, then this will fail. 60 int aom_uleb_encode_fixed_size(uint64_t value, size_t available, 61 size_t pad_to_size, uint8_t *coded_value, 62 size_t *coded_size); 63 64 #if defined(__cplusplus) 65 } // extern "C" 66 #endif // __cplusplus 67 68 #endif // AOM_AOM_AOM_INTEGER_H_ 69