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      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