1/*
2 * Bytestream functions
3 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVCODEC_BYTESTREAM_H
23#define AVCODEC_BYTESTREAM_H
24
25#include <string.h>
26#include "libavutil/common.h"
27#include "libavutil/intreadwrite.h"
28
29#define DEF_T(type, name, bytes, read, write)                             \
30static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
31    (*b) += bytes;\
32    return read(*b - bytes);\
33}\
34static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
35    write(*b, value);\
36    (*b) += bytes;\
37}
38
39#define DEF(name, bytes, read, write) \
40    DEF_T(unsigned int, name, bytes, read, write)
41#define DEF64(name, bytes, read, write) \
42    DEF_T(uint64_t, name, bytes, read, write)
43
44DEF64(le64, 8, AV_RL64, AV_WL64)
45DEF  (le32, 4, AV_RL32, AV_WL32)
46DEF  (le24, 3, AV_RL24, AV_WL24)
47DEF  (le16, 2, AV_RL16, AV_WL16)
48DEF64(be64, 8, AV_RB64, AV_WB64)
49DEF  (be32, 4, AV_RB32, AV_WB32)
50DEF  (be24, 3, AV_RB24, AV_WB24)
51DEF  (be16, 2, AV_RB16, AV_WB16)
52DEF  (byte, 1, AV_RB8 , AV_WB8 )
53
54#undef DEF
55#undef DEF64
56#undef DEF_T
57
58static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
59{
60    memcpy(dst, *b, size);
61    (*b) += size;
62    return size;
63}
64
65static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
66{
67    memcpy(*b, src, size);
68    (*b) += size;
69}
70
71#endif /* AVCODEC_BYTESTREAM_H */
72