aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / libavcodec / bytestream.h
1 /*
2 * Bytestream functions
3 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
4 * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #ifndef AVCODEC_BYTESTREAM_H
24 #define AVCODEC_BYTESTREAM_H
25
26 #include <stdint.h>
27 #include <string.h>
28
29 #include "libavutil/common.h"
30 #include "libavutil/intreadwrite.h"
31
32 typedef struct GetByteContext {
33 const uint8_t *buffer, *buffer_end, *buffer_start;
34 } GetByteContext;
35
36 typedef struct PutByteContext {
37 uint8_t *buffer, *buffer_end, *buffer_start;
38 int eof;
39 } PutByteContext;
40
41 #define DEF(type, name, bytes, read, write) \
42 static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \
43 { \
44 (*b) += bytes; \
45 return read(*b - bytes); \
46 } \
47 static av_always_inline void bytestream_put_ ## name(uint8_t **b, \
48 const type value) \
49 { \
50 write(*b, value); \
51 (*b) += bytes; \
52 } \
53 static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \
54 const type value) \
55 { \
56 bytestream_put_ ## name(&p->buffer, value); \
57 } \
58 static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \
59 const type value) \
60 { \
61 if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \
62 write(p->buffer, value); \
63 p->buffer += bytes; \
64 } else \
65 p->eof = 1; \
66 } \
67 static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \
68 { \
69 return bytestream_get_ ## name(&g->buffer); \
70 } \
71 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \
72 { \
73 if (g->buffer_end - g->buffer < bytes) { \
74 g->buffer = g->buffer_end; \
75 return 0; \
76 } \
77 return bytestream2_get_ ## name ## u(g); \
78 } \
79 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \
80 { \
81 if (g->buffer_end - g->buffer < bytes) \
82 return 0; \
83 return read(g->buffer); \
84 }
85
86 DEF(uint64_t, le64, 8, AV_RL64, AV_WL64)
87 DEF(unsigned int, le32, 4, AV_RL32, AV_WL32)
88 DEF(unsigned int, le24, 3, AV_RL24, AV_WL24)
89 DEF(unsigned int, le16, 2, AV_RL16, AV_WL16)
90 DEF(uint64_t, be64, 8, AV_RB64, AV_WB64)
91 DEF(unsigned int, be32, 4, AV_RB32, AV_WB32)
92 DEF(unsigned int, be24, 3, AV_RB24, AV_WB24)
93 DEF(unsigned int, be16, 2, AV_RB16, AV_WB16)
94 DEF(unsigned int, byte, 1, AV_RB8 , AV_WB8)
95
96 #if HAVE_BIGENDIAN
97 # define bytestream2_get_ne16 bytestream2_get_be16
98 # define bytestream2_get_ne24 bytestream2_get_be24
99 # define bytestream2_get_ne32 bytestream2_get_be32
100 # define bytestream2_get_ne64 bytestream2_get_be64
101 # define bytestream2_get_ne16u bytestream2_get_be16u
102 # define bytestream2_get_ne24u bytestream2_get_be24u
103 # define bytestream2_get_ne32u bytestream2_get_be32u
104 # define bytestream2_get_ne64u bytestream2_get_be64u
105 # define bytestream2_put_ne16 bytestream2_put_be16
106 # define bytestream2_put_ne24 bytestream2_put_be24
107 # define bytestream2_put_ne32 bytestream2_put_be32
108 # define bytestream2_put_ne64 bytestream2_put_be64
109 # define bytestream2_peek_ne16 bytestream2_peek_be16
110 # define bytestream2_peek_ne24 bytestream2_peek_be24
111 # define bytestream2_peek_ne32 bytestream2_peek_be32
112 # define bytestream2_peek_ne64 bytestream2_peek_be64
113 #else
114 # define bytestream2_get_ne16 bytestream2_get_le16
115 # define bytestream2_get_ne24 bytestream2_get_le24
116 # define bytestream2_get_ne32 bytestream2_get_le32
117 # define bytestream2_get_ne64 bytestream2_get_le64
118 # define bytestream2_get_ne16u bytestream2_get_le16u
119 # define bytestream2_get_ne24u bytestream2_get_le24u
120 # define bytestream2_get_ne32u bytestream2_get_le32u
121 # define bytestream2_get_ne64u bytestream2_get_le64u
122 # define bytestream2_put_ne16 bytestream2_put_le16
123 # define bytestream2_put_ne24 bytestream2_put_le24
124 # define bytestream2_put_ne32 bytestream2_put_le32
125 # define bytestream2_put_ne64 bytestream2_put_le64
126 # define bytestream2_peek_ne16 bytestream2_peek_le16
127 # define bytestream2_peek_ne24 bytestream2_peek_le24
128 # define bytestream2_peek_ne32 bytestream2_peek_le32
129 # define bytestream2_peek_ne64 bytestream2_peek_le64
130 #endif
131
132 static av_always_inline void bytestream2_init(GetByteContext *g,
133 const uint8_t *buf,
134 int buf_size)
135 {
136 g->buffer = buf;
137 g->buffer_start = buf;
138 g->buffer_end = buf + buf_size;
139 }
140
141 static av_always_inline void bytestream2_init_writer(PutByteContext *p,
142 uint8_t *buf,
143 int buf_size)
144 {
145 p->buffer = buf;
146 p->buffer_start = buf;
147 p->buffer_end = buf + buf_size;
148 p->eof = 0;
149 }
150
151 static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
152 {
153 return g->buffer_end - g->buffer;
154 }
155
156 static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
157 {
158 return p->buffer_end - p->buffer;
159 }
160
161 static av_always_inline void bytestream2_skip(GetByteContext *g,
162 unsigned int size)
163 {
164 g->buffer += FFMIN(g->buffer_end - g->buffer, size);
165 }
166
167 static av_always_inline void bytestream2_skipu(GetByteContext *g,
168 unsigned int size)
169 {
170 g->buffer += size;
171 }
172
173 static av_always_inline void bytestream2_skip_p(PutByteContext *p,
174 unsigned int size)
175 {
176 int size2;
177 if (p->eof)
178 return;
179 size2 = FFMIN(p->buffer_end - p->buffer, size);
180 if (size2 != size)
181 p->eof = 1;
182 p->buffer += size2;
183 }
184
185 static av_always_inline int bytestream2_tell(GetByteContext *g)
186 {
187 return (int)(g->buffer - g->buffer_start);
188 }
189
190 static av_always_inline int bytestream2_tell_p(PutByteContext *p)
191 {
192 return (int)(p->buffer - p->buffer_start);
193 }
194
195 static av_always_inline int bytestream2_size(GetByteContext *g)
196 {
197 return (int)(g->buffer_end - g->buffer_start);
198 }
199
200 static av_always_inline int bytestream2_size_p(PutByteContext *p)
201 {
202 return (int)(p->buffer_end - p->buffer_start);
203 }
204
205 static av_always_inline int bytestream2_seek(GetByteContext *g,
206 int offset,
207 int whence)
208 {
209 switch (whence) {
210 case SEEK_CUR:
211 offset = av_clip(offset, -(g->buffer - g->buffer_start),
212 g->buffer_end - g->buffer);
213 g->buffer += offset;
214 break;
215 case SEEK_END:
216 offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
217 g->buffer = g->buffer_end + offset;
218 break;
219 case SEEK_SET:
220 offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
221 g->buffer = g->buffer_start + offset;
222 break;
223 default:
224 return AVERROR(EINVAL);
225 }
226 return bytestream2_tell(g);
227 }
228
229 static av_always_inline int bytestream2_seek_p(PutByteContext *p,
230 int offset,
231 int whence)
232 {
233 p->eof = 0;
234 switch (whence) {
235 case SEEK_CUR:
236 if (p->buffer_end - p->buffer < offset)
237 p->eof = 1;
238 offset = av_clip(offset, -(p->buffer - p->buffer_start),
239 p->buffer_end - p->buffer);
240 p->buffer += offset;
241 break;
242 case SEEK_END:
243 if (offset > 0)
244 p->eof = 1;
245 offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
246 p->buffer = p->buffer_end + offset;
247 break;
248 case SEEK_SET:
249 if (p->buffer_end - p->buffer_start < offset)
250 p->eof = 1;
251 offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
252 p->buffer = p->buffer_start + offset;
253 break;
254 default:
255 return AVERROR(EINVAL);
256 }
257 return bytestream2_tell_p(p);
258 }
259
260 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
261 uint8_t *dst,
262 unsigned int size)
263 {
264 int size2 = FFMIN(g->buffer_end - g->buffer, size);
265 memcpy(dst, g->buffer, size2);
266 g->buffer += size2;
267 return size2;
268 }
269
270 static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g,
271 uint8_t *dst,
272 unsigned int size)
273 {
274 memcpy(dst, g->buffer, size);
275 g->buffer += size;
276 return size;
277 }
278
279 static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
280 const uint8_t *src,
281 unsigned int size)
282 {
283 int size2;
284 if (p->eof)
285 return 0;
286 size2 = FFMIN(p->buffer_end - p->buffer, size);
287 if (size2 != size)
288 p->eof = 1;
289 memcpy(p->buffer, src, size2);
290 p->buffer += size2;
291 return size2;
292 }
293
294 static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p,
295 const uint8_t *src,
296 unsigned int size)
297 {
298 memcpy(p->buffer, src, size);
299 p->buffer += size;
300 return size;
301 }
302
303 static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
304 const uint8_t c,
305 unsigned int size)
306 {
307 int size2;
308 if (p->eof)
309 return;
310 size2 = FFMIN(p->buffer_end - p->buffer, size);
311 if (size2 != size)
312 p->eof = 1;
313 memset(p->buffer, c, size2);
314 p->buffer += size2;
315 }
316
317 static av_always_inline void bytestream2_set_bufferu(PutByteContext *p,
318 const uint8_t c,
319 unsigned int size)
320 {
321 memset(p->buffer, c, size);
322 p->buffer += size;
323 }
324
325 static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
326 {
327 return p->eof;
328 }
329
330 static av_always_inline unsigned int bytestream2_copy_bufferu(PutByteContext *p,
331 GetByteContext *g,
332 unsigned int size)
333 {
334 memcpy(p->buffer, g->buffer, size);
335 p->buffer += size;
336 g->buffer += size;
337 return size;
338 }
339
340 static av_always_inline unsigned int bytestream2_copy_buffer(PutByteContext *p,
341 GetByteContext *g,
342 unsigned int size)
343 {
344 int size2;
345
346 if (p->eof)
347 return 0;
348 size = FFMIN(g->buffer_end - g->buffer, size);
349 size2 = FFMIN(p->buffer_end - p->buffer, size);
350 if (size2 != size)
351 p->eof = 1;
352
353 return bytestream2_copy_bufferu(p, g, size2);
354 }
355
356 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
357 uint8_t *dst,
358 unsigned int size)
359 {
360 memcpy(dst, *b, size);
361 (*b) += size;
362 return size;
363 }
364
365 static av_always_inline void bytestream_put_buffer(uint8_t **b,
366 const uint8_t *src,
367 unsigned int size)
368 {
369 memcpy(*b, src, size);
370 (*b) += size;
371 }
372
373 #endif /* AVCODEC_BYTESTREAM_H */