FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/aviobuf.c
Date: 2025-08-19 23:55:23
Exec Total Coverage
Lines: 739 848 87.1%
Functions: 86 88 97.7%
Branches: 428 604 70.9%
Line Branch Exec Source
1 /*
2 * buffered I/O
3 * Copyright (c) 2000,2001 Fabrice Bellard
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 #include "libavutil/bprint.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/defs.h"
31 #include "avio.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include <stdarg.h>
35
36 #define IO_BUFFER_SIZE 32768
37
38 /**
39 * Do seeks within this distance ahead of the current buffer by skipping
40 * data instead of calling the protocol seek function, for seekable
41 * protocols.
42 */
43 #define SHORT_SEEK_THRESHOLD 32768
44
45 static void fill_buffer(AVIOContext *s);
46 static int url_resetbuf(AVIOContext *s, int flags);
47 /** @warning must be called before any I/O */
48 static int set_buf_size(AVIOContext *s, int buf_size);
49
50 239639 void ffio_init_context(FFIOContext *ctx,
51 unsigned char *buffer,
52 int buffer_size,
53 int write_flag,
54 void *opaque,
55 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
56 int (*write_packet)(void *opaque, const uint8_t *buf, int buf_size),
57 int64_t (*seek)(void *opaque, int64_t offset, int whence))
58 {
59 239639 AVIOContext *const s = &ctx->pub;
60
61 239639 memset(ctx, 0, sizeof(*ctx));
62
63 239639 s->buffer = buffer;
64 239639 ctx->orig_buffer_size =
65 239639 s->buffer_size = buffer_size;
66 239639 s->buf_ptr = buffer;
67 239639 s->buf_ptr_max = buffer;
68 239639 s->opaque = opaque;
69 239639 s->direct = 0;
70
71
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 239639 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
72
73 239639 s->write_packet = write_packet;
74 239639 s->read_packet = read_packet;
75 239639 s->seek = seek;
76 239639 s->pos = 0;
77 239639 s->eof_reached = 0;
78 239639 s->error = 0;
79 239639 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
80 239639 s->min_packet_size = 0;
81 239639 s->max_packet_size = 0;
82 239639 s->update_checksum = NULL;
83 239639 ctx->short_seek_threshold = SHORT_SEEK_THRESHOLD;
84
85
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 239639 if (!read_packet && !write_flag) {
86 81918 s->pos = buffer_size;
87 81918 s->buf_end = s->buffer + buffer_size;
88 }
89 239639 s->read_pause = NULL;
90 239639 s->read_seek = NULL;
91
92 239639 s->write_data_type = NULL;
93 239639 s->ignore_boundary_point = 0;
94 239639 ctx->current_type = AVIO_DATA_MARKER_UNKNOWN;
95 239639 ctx->last_time = AV_NOPTS_VALUE;
96 239639 ctx->short_seek_get = NULL;
97 239639 }
98
99 81749 void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size)
100 {
101 81749 ffio_init_context(s, (unsigned char*)buffer, buffer_size, 0, NULL, NULL, NULL, NULL);
102 81749 }
103
104 218 void ffio_init_write_context(FFIOContext *s, uint8_t *buffer, int buffer_size)
105 {
106 218 ffio_init_context(s, buffer, buffer_size, 1, NULL, NULL, NULL, NULL);
107 218 }
108
109 116589 AVIOContext *avio_alloc_context(
110 unsigned char *buffer,
111 int buffer_size,
112 int write_flag,
113 void *opaque,
114 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
115 int (*write_packet)(void *opaque, const uint8_t *buf, int buf_size),
116 int64_t (*seek)(void *opaque, int64_t offset, int whence))
117 {
118 116589 FFIOContext *s = av_malloc(sizeof(*s));
119
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 116589 if (!s)
120 ✗ return NULL;
121 116589 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
122 read_packet, write_packet, seek);
123 116589 return &s->pub;
124 }
125
126 136008 void avio_context_free(AVIOContext **ps)
127 {
128
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 136008 if (ps && *ps) {
129 136006 AVIOContext *s = *ps;
130 136006 av_freep(&s->protocol_whitelist);
131 136006 av_freep(&s->protocol_blacklist);
132 }
133 136008 av_freep(ps);
134 136008 }
135
136 430965 static void writeout(AVIOContext *s, const uint8_t *data, int len)
137 {
138 430965 FFIOContext *const ctx = ffiocontext(s);
139
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 430965 if (!s->error) {
140 430965 int ret = 0;
141
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 430965 if (s->write_data_type)
142 126 ret = s->write_data_type(s->opaque, data,
143 len,
144 ctx->current_type,
145 ctx->last_time);
146
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 430839 else if (s->write_packet)
147 430832 ret = s->write_packet(s->opaque, data, len);
148
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 430965 if (ret < 0) {
149 ✗ s->error = ret;
150 } else {
151 430965 ctx->bytes_written += len;
152 430965 s->bytes_written = ctx->bytes_written;
153
154
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 430965 if (s->pos + len > ctx->written_output_size) {
155 429125 ctx->written_output_size = s->pos + len;
156 }
157 }
158 }
159
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 430965 if (ctx->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
160
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 430918 ctx->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
161 52 ctx->current_type = AVIO_DATA_MARKER_UNKNOWN;
162 }
163 430965 ctx->last_time = AV_NOPTS_VALUE;
164 430965 ctx->writeout_count++;
165 430965 s->pos += len;
166 430965 }
167
168 567889 static void flush_buffer(AVIOContext *s)
169 {
170 567889 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
171
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 567889 if (s->write_flag && s->buf_ptr_max > s->buffer) {
172 423715 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
173
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 423715 if (s->update_checksum) {
174 ✗ s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
175 ✗ s->buf_ptr_max - s->checksum_ptr);
176 ✗ s->checksum_ptr = s->buffer;
177 }
178 }
179 567889 s->buf_ptr = s->buf_ptr_max = s->buffer;
180
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 567889 if (!s->write_flag)
181 107403 s->buf_end = s->buffer;
182 567889 }
183
184 3573582 void avio_w8(AVIOContext *s, int b)
185 {
186 av_assert2(b>=-128 && b<=255);
187 3573582 *s->buf_ptr++ = b;
188
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 3573582 if (s->buf_ptr >= s->buf_end)
189 65 flush_buffer(s);
190 3573582 }
191
192 33865 void ffio_fill(AVIOContext *s, int b, int64_t count)
193 {
194
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 55359 while (count > 0) {
195 21494 int len = FFMIN(s->buf_end - s->buf_ptr, count);
196 21494 memset(s->buf_ptr, b, len);
197 21494 s->buf_ptr += len;
198
199
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 21494 if (s->buf_ptr >= s->buf_end)
200 194 flush_buffer(s);
201
202 21494 count -= len;
203 }
204 33865 }
205
206 721344 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
207 {
208
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 721344 if (size <= 0)
209 8000 return;
210
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 713344 if (s->direct && !s->update_checksum) {
211 7250 avio_flush(s);
212 7250 writeout(s, buf, size);
213 7250 return;
214 }
215 do {
216 864275 int len = FFMIN(s->buf_end - s->buf_ptr, size);
217 864275 memcpy(s->buf_ptr, buf, len);
218 864275 s->buf_ptr += len;
219
220
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 864275 if (s->buf_ptr >= s->buf_end)
221 159049 flush_buffer(s);
222
223 864275 buf += len;
224 864275 size -= len;
225
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 864275 } while (size > 0);
226 }
227
228 405624 void avio_flush(AVIOContext *s)
229 {
230
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 405624 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
231 405624 flush_buffer(s);
232
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 405624 if (seekback)
233 127 avio_seek(s, seekback, SEEK_CUR);
234 405624 }
235
236 3859323 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
237 {
238 3859323 FFIOContext *const ctx = ffiocontext(s);
239 int64_t offset1;
240 int64_t pos;
241 int buffer_size;
242 int short_seek;
243 3859323 whence &= ~AVSEEK_FORCE; // force flag does nothing
244
245
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 3859323 if(!s)
246 11927 return AVERROR(EINVAL);
247
248
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 3847396 if ((whence & AVSEEK_SIZE))
249 ✗ return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS);
250
251 3847396 buffer_size = s->buf_end - s->buffer;
252 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
253
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 3847396 pos = s->pos - (s->write_flag ? 0 : buffer_size);
254
255
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 3847396 if (whence != SEEK_CUR && whence != SEEK_SET)
256 ✗ return AVERROR(EINVAL);
257
258
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 3847396 if (whence == SEEK_CUR) {
259 3630197 offset1 = pos + (s->buf_ptr - s->buffer);
260
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 3630197 if (offset == 0)
261 3507546 return offset1;
262
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 122651 if (offset > INT64_MAX - offset1)
263 ✗ return AVERROR(EINVAL);
264 122651 offset += offset1;
265 }
266
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 339850 if (offset < 0)
267 54 return AVERROR(EINVAL);
268
269 339796 short_seek = ctx->short_seek_threshold;
270
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 339796 if (ctx->short_seek_get) {
271 323939 int tmp = ctx->short_seek_get(s->opaque);
272 323939 short_seek = FFMAX(tmp, short_seek);
273 }
274
275 339796 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
276 339796 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
277
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 339796 if ((!s->direct || !s->seek) &&
278
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 332107 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
279 /* can do the seek inside the buffer */
280 325727 s->buf_ptr = s->buffer + offset1;
281
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 14069 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
282
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 14062 offset1 <= buffer_size + short_seek) &&
283
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 10132 !s->write_flag && offset1 >= 0 &&
284
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 2186 (!s->direct || !s->seek)) {
285
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 4434 while(s->pos < offset && !s->eof_reached)
286 2256 fill_buffer(s);
287
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 2178 if (s->eof_reached)
288 72 return AVERROR_EOF;
289 2106 s->buf_ptr = s->buf_end - (s->pos - offset);
290
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 11891 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
291 int64_t res;
292
293 535 pos -= FFMIN(buffer_size>>1, pos);
294
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 535 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
295 ✗ return res;
296 535 s->buf_end =
297 535 s->buf_ptr = s->buffer;
298 535 s->pos = pos;
299 535 s->eof_reached = 0;
300 535 fill_buffer(s);
301 535 return avio_seek(s, offset, SEEK_SET);
302 } else {
303 int64_t res;
304
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 11356 if (s->write_flag) {
305 2957 flush_buffer(s);
306 }
307
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 11356 if (!s->seek)
308 2 return AVERROR(EPIPE);
309
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 11354 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
310 ✗ return res;
311 11354 ctx->seek_count++;
312
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 11354 if (!s->write_flag)
313 8397 s->buf_end = s->buffer;
314 11354 s->buf_ptr = s->buf_ptr_max = s->buffer;
315 11354 s->pos = offset;
316 }
317 339187 s->eof_reached = 0;
318 339187 return offset;
319 }
320
321 129774 int64_t avio_skip(AVIOContext *s, int64_t offset)
322 {
323 129774 return avio_seek(s, offset, SEEK_CUR);
324 }
325
326 628862 int64_t avio_size(AVIOContext *s)
327 {
328 628862 FFIOContext *const ctx = ffiocontext(s);
329 int64_t size;
330
331
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 628862 if (!s)
332 ✗ return AVERROR(EINVAL);
333
334
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 628862 if (ctx->written_output_size)
335 401728 return ctx->written_output_size;
336
337
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 227134 if (!s->seek)
338 2 return AVERROR(ENOSYS);
339 227132 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
340
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 227132 if (size < 0) {
341
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 14732 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
342 14727 return size;
343 5 size++;
344 5 s->seek(s->opaque, s->pos, SEEK_SET);
345 }
346 212405 return size;
347 }
348
349 6407620 int avio_feof(AVIOContext *s)
350 {
351
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 6407620 if(!s)
352 ✗ return 0;
353
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 6407620 if(s->eof_reached){
354 7293 s->eof_reached=0;
355 7293 fill_buffer(s);
356 }
357 6407620 return s->eof_reached;
358 }
359
360 542166 void avio_wl32(AVIOContext *s, unsigned int val)
361 {
362 542166 avio_w8(s, (uint8_t) val );
363 542166 avio_w8(s, (uint8_t)(val >> 8 ));
364 542166 avio_w8(s, (uint8_t)(val >> 16));
365 542166 avio_w8(s, val >> 24 );
366 542166 }
367
368 149143 void avio_wb32(AVIOContext *s, unsigned int val)
369 {
370 149143 avio_w8(s, val >> 24 );
371 149143 avio_w8(s, (uint8_t)(val >> 16));
372 149143 avio_w8(s, (uint8_t)(val >> 8 ));
373 149143 avio_w8(s, (uint8_t) val );
374 149143 }
375
376 498 int avio_put_str(AVIOContext *s, const char *str)
377 {
378 498 int len = 1;
379
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 498 if (str) {
380 498 len += strlen(str);
381 498 avio_write(s, (const unsigned char *) str, len);
382 } else
383 ✗ avio_w8(s, 0);
384 498 return len;
385 }
386
387 178 static inline int put_str16(AVIOContext *s, const char *str, const int be)
388 {
389 178 const uint8_t *q = str;
390 178 int ret = 0;
391 178 int err = 0;
392
393
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 1415 while (*q) {
394 uint32_t ch;
395 uint16_t tmp;
396
397
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 1269 GET_UTF8(ch, *q++, goto invalid;)
398
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 1237 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
399 ret += 2;)
400 1237 continue;
401 ✗ invalid:
402 ✗ av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
403 ✗ err = AVERROR(EINVAL);
404 ✗ if (!*(q-1))
405 ✗ break;
406 }
407
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 178 if (be)
408 144 avio_wb16(s, 0);
409 else
410 34 avio_wl16(s, 0);
411
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 178 if (err)
412 ✗ return err;
413 178 ret += 2;
414 178 return ret;
415 }
416
417 #define PUT_STR16(type, big_endian) \
418 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
419 { \
420 return put_str16(s, str, big_endian); \
421 }
422
423 34 PUT_STR16(le, 0)
424 144 PUT_STR16(be, 1)
425
426 #undef PUT_STR16
427
428 1047 void avio_wl64(AVIOContext *s, uint64_t val)
429 {
430 1047 avio_wl32(s, (uint32_t)(val & 0xffffffff));
431 1047 avio_wl32(s, (uint32_t)(val >> 32));
432 1047 }
433
434 26618 void avio_wb64(AVIOContext *s, uint64_t val)
435 {
436 26618 avio_wb32(s, (uint32_t)(val >> 32));
437 26618 avio_wb32(s, (uint32_t)(val & 0xffffffff));
438 26618 }
439
440 28442 void avio_wl16(AVIOContext *s, unsigned int val)
441 {
442 28442 avio_w8(s, (uint8_t)val);
443 28442 avio_w8(s, (int)val >> 8);
444 28442 }
445
446 86737 void avio_wb16(AVIOContext *s, unsigned int val)
447 {
448 86737 avio_w8(s, (int)val >> 8);
449 86737 avio_w8(s, (uint8_t)val);
450 86737 }
451
452 22 void avio_wl24(AVIOContext *s, unsigned int val)
453 {
454 22 avio_wl16(s, val & 0xffff);
455 22 avio_w8(s, (int)val >> 16);
456 22 }
457
458 12317 void avio_wb24(AVIOContext *s, unsigned int val)
459 {
460 12317 avio_wb16(s, (int)val >> 8);
461 12317 avio_w8(s, (uint8_t)val);
462 12317 }
463
464 546710 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
465 {
466 546710 FFIOContext *const ctx = ffiocontext(s);
467
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 546710 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
468
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 525340 if (s->buf_ptr - s->buffer >= s->min_packet_size)
469 265029 avio_flush(s);
470 525340 return;
471 }
472
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 21370 if (!s->write_data_type)
473 21187 return;
474 // If ignoring boundary points, just treat it as unknown
475
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 183 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
476 ✗ type = AVIO_DATA_MARKER_UNKNOWN;
477 // Avoid unnecessary flushes if we are already in non-header/trailer
478 // data and setting the type to unknown
479
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 183 if (type == AVIO_DATA_MARKER_UNKNOWN &&
480
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 28 (ctx->current_type != AVIO_DATA_MARKER_HEADER &&
481 ✗ ctx->current_type != AVIO_DATA_MARKER_TRAILER))
482 ✗ return;
483
484
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 183 switch (type) {
485 103 case AVIO_DATA_MARKER_HEADER:
486 case AVIO_DATA_MARKER_TRAILER:
487 // For header/trailer, ignore a new marker of the same type;
488 // consecutive header/trailer markers can be merged.
489
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 103 if (type == ctx->current_type)
490 11 return;
491 92 break;
492 }
493
494 // If we've reached here, we have a new, noteworthy marker.
495 // Flush the previous data and mark the start of the new data.
496 172 avio_flush(s);
497 172 ctx->current_type = type;
498 172 ctx->last_time = time;
499 }
500
501 224333 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
502 {
503 int ret;
504
505
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 224333 if (!s->read_packet)
506 5 return AVERROR(EINVAL);
507 224328 ret = s->read_packet(s->opaque, buf, size);
508 av_assert2(ret || s->max_packet_size);
509 224328 return ret;
510 }
511
512 /* Input stream */
513
514 96573 static void fill_buffer(AVIOContext *s)
515 {
516 96573 FFIOContext *const ctx = (FFIOContext *)s;
517 193146 int max_buffer_size = s->max_packet_size ?
518
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 96573 s->max_packet_size : IO_BUFFER_SIZE;
519
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 96573 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size <= s->buffer_size ?
520 s->buf_end : s->buffer;
521 96573 int len = s->buffer_size - (dst - s->buffer);
522
523 /* can't fill the buffer without read_packet, just set EOF if appropriate */
524
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 96573 if (!s->read_packet && s->buf_ptr >= s->buf_end)
525 6 s->eof_reached = 1;
526
527 /* no need to do anything if EOF already reached */
528
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 96573 if (s->eof_reached)
529 10292 return;
530
531
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 86281 if (s->update_checksum && dst == s->buffer) {
532
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 337 if (s->buf_end > s->checksum_ptr)
533 264 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
534 264 s->buf_end - s->checksum_ptr);
535 337 s->checksum_ptr = s->buffer;
536 }
537
538 /* make buffer smaller in case it ended up large after probing */
539
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 86281 if (s->read_packet && ctx->orig_buffer_size &&
540
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 86276 s->buffer_size > ctx->orig_buffer_size && len >= ctx->orig_buffer_size) {
541
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 344 if (dst == s->buffer && s->buf_ptr != dst) {
542 22 int ret = set_buf_size(s, ctx->orig_buffer_size);
543
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 22 if (ret < 0)
544 ✗ av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
545
546 22 s->checksum_ptr = dst = s->buffer;
547 }
548 344 len = ctx->orig_buffer_size;
549 }
550
551 86281 len = read_packet_wrapper(s, dst, len);
552
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 86281 if (len == AVERROR_EOF) {
553 /* do not modify buffer if EOF reached so that a seek back can
554 be done without rereading data */
555 11856 s->eof_reached = 1;
556
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 74425 } else if (len < 0) {
557 5 s->eof_reached = 1;
558 5 s->error= len;
559 } else {
560 74420 s->pos += len;
561 74420 s->buf_ptr = dst;
562 74420 s->buf_end = dst + len;
563 74420 ffiocontext(s)->bytes_read += len;
564 74420 s->bytes_read = ffiocontext(s)->bytes_read;
565 }
566 }
567
568 33827 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
569 unsigned int len)
570 {
571 33827 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
572 }
573
574 14 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
575 unsigned int len)
576 {
577 14 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
578 }
579
580 72 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
581 unsigned int len)
582 {
583 72 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
584 }
585
586 31012 unsigned long ffio_get_checksum(AVIOContext *s)
587 {
588 62024 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
589 31012 s->buf_ptr - s->checksum_ptr);
590 31012 s->update_checksum = NULL;
591 31012 return s->checksum;
592 }
593
594 31099 void ffio_init_checksum(AVIOContext *s,
595 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
596 unsigned long checksum)
597 {
598 31099 s->update_checksum = update_checksum;
599
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 31099 if (s->update_checksum) {
600 31070 s->checksum = checksum;
601 31070 s->checksum_ptr = s->buf_ptr;
602 }
603 31099 }
604
605 /* XXX: put an inline version */
606 11835239 int avio_r8(AVIOContext *s)
607 {
608
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 11835239 if (s->buf_ptr >= s->buf_end)
609 24349 fill_buffer(s);
610
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 11835239 if (s->buf_ptr < s->buf_end)
611 11824114 return *s->buf_ptr++;
612 11125 return 0;
613 }
614
615 744774 int avio_read(AVIOContext *s, unsigned char *buf, int size)
616 {
617 int len, size1;
618
619 744774 size1 = size;
620
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 1556449 while (size > 0) {
621 814014 len = FFMIN(s->buf_end - s->buf_ptr, size);
622
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 814014 if (len == 0 || s->write_flag) {
623
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 180212 if((s->direct || size > s->buffer_size) && !s->update_checksum && s->read_packet) {
624 // bypass the buffer and read data directly into buf
625 138052 len = read_packet_wrapper(s, buf, size);
626
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 138052 if (len == AVERROR_EOF) {
627 /* do not modify buffer if EOF reached so that a seek back can
628 be done without rereading data */
629 573 s->eof_reached = 1;
630 573 break;
631
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 137479 } else if (len < 0) {
632 ✗ s->eof_reached = 1;
633 ✗ s->error= len;
634 ✗ break;
635 } else {
636 137479 s->pos += len;
637 137479 ffiocontext(s)->bytes_read += len;
638 137479 s->bytes_read = ffiocontext(s)->bytes_read;
639 137479 size -= len;
640 137479 buf += len;
641 // reset the buffer
642 137479 s->buf_ptr = s->buffer;
643 137479 s->buf_end = s->buffer/* + len*/;
644 }
645 } else {
646 42160 fill_buffer(s);
647 42160 len = s->buf_end - s->buf_ptr;
648
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 42160 if (len == 0)
649 1766 break;
650 }
651 } else {
652 633802 memcpy(buf, s->buf_ptr, len);
653 633802 buf += len;
654 633802 s->buf_ptr += len;
655 633802 size -= len;
656 }
657 }
658
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 744774 if (size1 == size) {
659
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 3323 if (s->error) return s->error;
660
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 3323 if (avio_feof(s)) return AVERROR_EOF;
661 }
662 743173 return size1 - size;
663 }
664
665 42953 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
666 {
667 42953 int ret = avio_read(s, buf, size);
668
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 42953 if (ret == size)
669 42937 return ret;
670
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 16 if (ret < 0 && ret != AVERROR_EOF)
671 ✗ return ret;
672 16 return AVERROR_INVALIDDATA;
673 }
674
675 407622 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
676 {
677
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 407622 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
678 404794 *data = s->buf_ptr;
679 404794 s->buf_ptr += size;
680 404794 return size;
681 } else {
682 2828 *data = buf;
683 2828 return avio_read(s, buf, size);
684 }
685 }
686
687 589889 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
688 {
689 int len;
690
691
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 589889 if (size < 0)
692 ✗ return AVERROR(EINVAL);
693
694
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 589889 if (s->read_packet && s->write_flag) {
695 ✗ len = read_packet_wrapper(s, buf, size);
696 ✗ if (len > 0)
697 ✗ s->pos += len;
698 ✗ return len;
699 }
700
701 589889 len = s->buf_end - s->buf_ptr;
702
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 589889 if (len == 0) {
703 19980 fill_buffer(s);
704 19980 len = s->buf_end - s->buf_ptr;
705 }
706
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 589889 if (len > size)
707 569347 len = size;
708 589889 memcpy(buf, s->buf_ptr, len);
709 589889 s->buf_ptr += len;
710
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 589889 if (!len) {
711
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 1922 if (s->error) return s->error;
712
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 1922 if (avio_feof(s)) return AVERROR_EOF;
713 }
714 587967 return len;
715 }
716
717 856002 unsigned int avio_rl16(AVIOContext *s)
718 {
719 unsigned int val;
720 856002 val = avio_r8(s);
721 856002 val |= avio_r8(s) << 8;
722 856002 return val;
723 }
724
725 344 unsigned int avio_rl24(AVIOContext *s)
726 {
727 unsigned int val;
728 344 val = avio_rl16(s);
729 344 val |= avio_r8(s) << 16;
730 344 return val;
731 }
732
733 409829 unsigned int avio_rl32(AVIOContext *s)
734 {
735 unsigned int val;
736 409829 val = avio_rl16(s);
737 409829 val |= avio_rl16(s) << 16;
738 409829 return val;
739 }
740
741 5295 uint64_t avio_rl64(AVIOContext *s)
742 {
743 uint64_t val;
744 5295 val = (uint64_t)avio_rl32(s);
745 5295 val |= (uint64_t)avio_rl32(s) << 32;
746 5295 return val;
747 }
748
749 1149831 unsigned int avio_rb16(AVIOContext *s)
750 {
751 unsigned int val;
752 1149831 val = avio_r8(s) << 8;
753 1149831 val |= avio_r8(s);
754 1149831 return val;
755 }
756
757 27319 unsigned int avio_rb24(AVIOContext *s)
758 {
759 unsigned int val;
760 27319 val = avio_rb16(s) << 8;
761 27319 val |= avio_r8(s);
762 27319 return val;
763 }
764 512537 unsigned int avio_rb32(AVIOContext *s)
765 {
766 unsigned int val;
767 512537 val = avio_rb16(s) << 16;
768 512537 val |= avio_rb16(s);
769 512537 return val;
770 }
771
772 946 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
773 {
774 946 int i = 0;
775 char c;
776
777 do {
778 24871 c = avio_r8(s);
779
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 24871 if (c && i < maxlen-1)
780 24841 buf[i++] = c;
781
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 24871 } while (c != '\n' && c != '\r' && c);
782
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 946 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
783 ✗ avio_skip(s, -1);
784
785 946 buf[i] = 0;
786 946 return i;
787 }
788
789 245 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
790 {
791 245 int len = ff_get_line(s, buf, maxlen);
792
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 476 while (len > 0 && av_isspace(buf[len - 1]))
793 231 buf[--len] = '\0';
794 245 return len;
795 }
796
797 typedef enum FFBPrintReadStringMode {
798 FFBPrintReadString = 0,
799 FFBPrintReadLine = 1,
800 } FFBPrintReadStringMode;
801
802 323 static int64_t read_string_to_bprint(AVIOContext *s, AVBPrint *bp,
803 FFBPrintReadStringMode mode,
804 int64_t max_len)
805 {
806 int len, end;
807 323 int64_t read = 0;
808 char tmp[1024];
809 char c;
810
811
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 323 if (!max_len)
812 ✗ return 0;
813
814 do {
815 323 len = 0;
816 do {
817 5154 c = avio_r8(s);
818
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 5154 end = ((mode == FFBPrintReadLine && (c == '\r' || c == '\n')) ||
819 c == '\0');
820
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 5154 if (!end)
821 4831 tmp[len++] = c;
822
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 5154 } while (!end && len < sizeof(tmp) &&
823
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 542 ((max_len < 0) || (read + len < max_len)));
824 323 av_bprint_append_data(bp, tmp, len);
825 323 read += len;
826
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 323 } while (!end && ((max_len < 0) || (read < max_len)));
827
828
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 323 if (mode == FFBPrintReadLine &&
829 ✗ c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
830 ✗ avio_skip(s, -1);
831
832
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 323 if (!c && s->error)
833 ✗ return s->error;
834
835
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 323 if (!c && !read && avio_feof(s))
836 5 return AVERROR_EOF;
837
838 318 return read;
839 }
840
841 323 static int64_t read_string_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp,
842 FFBPrintReadStringMode mode,
843 int64_t max_len)
844 {
845 int64_t ret;
846
847 323 av_bprint_clear(bp);
848 323 ret = read_string_to_bprint(s, bp, mode, max_len);
849
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 323 if (ret < 0)
850 5 return ret;
851
852
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 318 if (!av_bprint_is_complete(bp))
853 ✗ return AVERROR(ENOMEM);
854
855 318 return bp->len;
856 }
857
858 273 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
859 {
860 273 return read_string_to_bprint_overwrite(s, bp, FFBPrintReadLine, -1);
861 }
862
863 50 int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp,
864 int64_t max_len)
865 {
866 50 return read_string_to_bprint_overwrite(s, bp, FFBPrintReadString, max_len);
867 }
868
869 597 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
870 {
871 int i;
872
873
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 597 if (buflen <= 0)
874 ✗ return AVERROR(EINVAL);
875 // reserve 1 byte for terminating 0
876 597 buflen = FFMIN(buflen - 1, maxlen);
877
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 9121 for (i = 0; i < buflen; i++)
878
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 8849 if (!(buf[i] = avio_r8(s)))
879 325 return i + 1;
880 272 buf[i] = 0;
881
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 542 for (; i < maxlen; i++)
882
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 280 if (!avio_r8(s))
883 10 return i + 1;
884 262 return maxlen;
885 }
886
887 #define GET_STR16(type, read) \
888 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
889 {\
890 char* q = buf;\
891 int ret = 0;\
892 if (buflen <= 0) \
893 return AVERROR(EINVAL); \
894 while (ret + 1 < maxlen) {\
895 uint8_t tmp;\
896 uint32_t ch;\
897 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
898 if (!ch)\
899 break;\
900 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
901 }\
902 *q = 0;\
903 return ret;\
904 }\
905
906
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 8447 GET_STR16(le, avio_rl16)
907
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 5571 GET_STR16(be, avio_rb16)
908
909 #undef GET_STR16
910
911 144425 uint64_t avio_rb64(AVIOContext *s)
912 {
913 uint64_t val;
914 144425 val = (uint64_t)avio_rb32(s) << 32;
915 144425 val |= (uint64_t)avio_rb32(s);
916 144425 return val;
917 }
918
919 10692 uint64_t ffio_read_varlen(AVIOContext *bc){
920 10692 uint64_t val = 0;
921 int tmp;
922
923 do{
924 18257 tmp = avio_r8(bc);
925 18257 val= (val<<7) + (tmp&127);
926
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 18257 }while(tmp&128);
927 10692 return val;
928 }
929
930 1033 unsigned int ffio_read_leb(AVIOContext *s) {
931 1033 int more, i = 0;
932 1033 unsigned leb = 0;
933
934 do {
935 1429 int byte = avio_r8(s);
936 1429 unsigned bits = byte & 0x7f;
937 1429 more = byte & 0x80;
938
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 1429 if (i <= 4)
939 1429 leb |= bits << (i * 7);
940
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 1429 if (++i == 8)
941 ✗ break;
942
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 1429 } while (more);
943
944 1033 return leb;
945 }
946
947 1372 void ffio_write_leb(AVIOContext *s, unsigned val)
948 {
949 int len;
950 uint8_t byte;
951
952 1372 len = (av_log2(val) + 7) / 7;
953
954
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 3542 for (int i = 0; i < len; i++) {
955 2170 byte = val >> (7 * i) & 0x7f;
956
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 2170 if (i < len - 1)
957 798 byte |= 0x80;
958
959 2170 avio_w8(s, byte);
960 }
961 1372 }
962
963 28 void ffio_write_lines(AVIOContext *s, const unsigned char *buf, int size,
964 const unsigned char *ending)
965 {
966
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 28 int ending_len = ending ? strlen(ending) : 1;
967
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 28 if (!ending)
968 28 ending = "\n";
969
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 28 if (size < 0)
970 ✗ size = strlen(buf);
971
972
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 467 while (size > 0) {
973 439 size_t len = 0;
974 439 char last = 0;
975
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 19804 for (; len < size; len++) {
976 19804 last = buf[len];
977
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 19804 if (last == '\r' || last == '\n')
978 break;
979 }
980
981 439 avio_write(s, buf, len);
982 439 avio_write(s, ending, ending_len);
983
984 439 buf += len + 1;
985 439 size -= len + 1;
986
987
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 439 if (size > 0 && last == '\r' && buf[0] == '\n') {
988 103 buf++;
989 103 size--;
990 }
991 }
992 28 }
993
994 13 int ffio_copy_url_options(AVIOContext* pb, AVDictionary** avio_opts)
995 {
996 13 const char *opts[] = {
997 "headers", "user_agent", "cookies", "http_proxy", "referer", "rw_timeout", "icy", NULL };
998 13 const char **opt = opts;
999 13 uint8_t *buf = NULL;
1000 13 int ret = 0;
1001
1002
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 104 while (*opt) {
1003
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 91 if (av_opt_get(pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
1004
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 13 if (buf[0] != '\0') {
1005 13 ret = av_dict_set(avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
1006
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 13 if (ret < 0)
1007 ✗ return ret;
1008 } else {
1009 ✗ av_freep(&buf);
1010 }
1011 }
1012 91 opt++;
1013 }
1014
1015 13 return ret;
1016 }
1017
1018 11 static void update_checksum(AVIOContext *s)
1019 {
1020
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 11 if (s->update_checksum && s->buf_ptr > s->checksum_ptr) {
1021 ✗ s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
1022 ✗ s->buf_ptr - s->checksum_ptr);
1023 }
1024 11 }
1025
1026 22254 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
1027 {
1028 uint8_t *buffer;
1029 44508 int max_buffer_size = s->max_packet_size ?
1030
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 22254 s->max_packet_size : IO_BUFFER_SIZE;
1031 22254 ptrdiff_t filled = s->buf_end - s->buf_ptr;
1032
1033
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 22254 if (buf_size <= s->buf_end - s->buf_ptr)
1034 19202 return 0;
1035
1036
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 3052 if (buf_size > INT_MAX - max_buffer_size)
1037 ✗ return AVERROR(EINVAL);
1038
1039 3052 buf_size += max_buffer_size - 1;
1040
1041
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 3052 if (buf_size + s->buf_ptr - s->buffer <= s->buffer_size || s->seekable || !s->read_packet)
1042 3041 return 0;
1043
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 11 av_assert0(!s->write_flag);
1044
1045
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 11 if (buf_size <= s->buffer_size) {
1046 ✗ update_checksum(s);
1047 ✗ memmove(s->buffer, s->buf_ptr, filled);
1048 } else {
1049 11 buffer = av_malloc(buf_size);
1050
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 11 if (!buffer)
1051 ✗ return AVERROR(ENOMEM);
1052 11 update_checksum(s);
1053 11 memcpy(buffer, s->buf_ptr, filled);
1054 11 av_free(s->buffer);
1055 11 s->buffer = buffer;
1056 11 s->buffer_size = buf_size;
1057 }
1058 11 s->buf_ptr = s->buffer;
1059 11 s->buf_end = s->buffer + filled;
1060 11 s->checksum_ptr = s->buffer;
1061 11 return 0;
1062 }
1063
1064 6304 int ffio_limit(AVIOContext *s, int size)
1065 {
1066 6304 FFIOContext *const ctx = ffiocontext(s);
1067
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 6304 if (ctx->maxsize >= 0) {
1068 6277 int64_t pos = avio_tell(s);
1069 6277 int64_t remaining = ctx->maxsize - pos;
1070
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 6277 if (remaining < size) {
1071 421 int64_t newsize = avio_size(s);
1072
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 421 if (!ctx->maxsize || ctx->maxsize < newsize)
1073 416 ctx->maxsize = newsize - !newsize;
1074
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 421 if (pos > ctx->maxsize && ctx->maxsize >= 0)
1075 ✗ ctx->maxsize = AVERROR(EIO);
1076
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 421 if (ctx->maxsize >= 0)
1077 420 remaining = ctx->maxsize - pos;
1078 }
1079
1080
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 6277 if (ctx->maxsize >= 0 && remaining < size && size > 1) {
1081 5 av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG,
1082 "Truncating packet of size %d to %"PRId64"\n",
1083
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 5 size, remaining + !remaining);
1084 5 size = remaining + !remaining;
1085 }
1086 }
1087 6304 return size;
1088 }
1089
1090 22 static int set_buf_size(AVIOContext *s, int buf_size)
1091 {
1092 uint8_t *buffer;
1093 22 buffer = av_malloc(buf_size);
1094
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 22 if (!buffer)
1095 ✗ return AVERROR(ENOMEM);
1096
1097 22 av_free(s->buffer);
1098 22 s->buffer = buffer;
1099 44 ffiocontext(s)->orig_buffer_size =
1100 22 s->buffer_size = buf_size;
1101 22 s->buf_ptr = s->buf_ptr_max = buffer;
1102
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 22 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1103 22 return 0;
1104 }
1105
1106 ✗ int ffio_realloc_buf(AVIOContext *s, int buf_size)
1107 {
1108 uint8_t *buffer;
1109 int data_size;
1110
1111 ✗ if (!s->buffer_size)
1112 ✗ return set_buf_size(s, buf_size);
1113
1114 ✗ if (buf_size <= s->buffer_size)
1115 ✗ return 0;
1116
1117 ✗ buffer = av_malloc(buf_size);
1118 ✗ if (!buffer)
1119 ✗ return AVERROR(ENOMEM);
1120
1121 ✗ data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr);
1122 ✗ if (data_size > 0)
1123 ✗ memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size);
1124 ✗ av_free(s->buffer);
1125 ✗ s->buffer = buffer;
1126 ✗ ffiocontext(s)->orig_buffer_size = buf_size;
1127 ✗ s->buffer_size = buf_size;
1128 ✗ s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer;
1129 ✗ if (s->write_flag)
1130 ✗ s->buf_ptr_max = s->buffer + data_size;
1131
1132 ✗ s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size);
1133
1134 ✗ return 0;
1135 }
1136
1137 239661 static int url_resetbuf(AVIOContext *s, int flags)
1138 {
1139 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1140
1141
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 239661 if (flags & AVIO_FLAG_WRITE) {
1142 50293 s->buf_end = s->buffer + s->buffer_size;
1143 50293 s->write_flag = 1;
1144 } else {
1145 189368 s->buf_end = s->buffer;
1146 189368 s->write_flag = 0;
1147 }
1148 239661 return 0;
1149 }
1150
1151 3749 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1152 {
1153 int64_t buffer_start;
1154 int buffer_size;
1155 int overlap, new_size, alloc_size;
1156 3749 uint8_t *buf = *bufp;
1157
1158
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 3749 if (s->write_flag) {
1159 ✗ av_freep(bufp);
1160 ✗ return AVERROR(EINVAL);
1161 }
1162
1163 3749 buffer_size = s->buf_end - s->buffer;
1164
1165 /* the buffers must touch or overlap */
1166
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 3749 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1167 ✗ av_freep(bufp);
1168 ✗ return AVERROR(EINVAL);
1169 }
1170
1171 3749 overlap = buf_size - buffer_start;
1172 3749 new_size = buf_size + buffer_size - overlap;
1173
1174 3749 alloc_size = FFMAX(s->buffer_size, new_size);
1175
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 3749 if (alloc_size > buf_size)
1176
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 3695 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1177 ✗ return AVERROR(ENOMEM);
1178
1179
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 3749 if (new_size > buf_size) {
1180 3527 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1181 3527 buf_size = new_size;
1182 }
1183
1184 3749 av_free(s->buffer);
1185 3749 s->buf_ptr = s->buffer = buf;
1186 3749 s->buffer_size = alloc_size;
1187 3749 s->pos = buf_size;
1188 3749 s->buf_end = s->buf_ptr + buf_size;
1189 3749 s->eof_reached = 0;
1190
1191 3749 return 0;
1192 }
1193
1194 23665 int avio_vprintf(AVIOContext *s, const char *fmt, va_list ap)
1195 {
1196 AVBPrint bp;
1197
1198 23665 av_bprint_init(&bp, 0, INT_MAX);
1199 23665 av_vbprintf(&bp, fmt, ap);
1200
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 23665 if (!av_bprint_is_complete(&bp)) {
1201 ✗ av_bprint_finalize(&bp, NULL);
1202 ✗ s->error = AVERROR(ENOMEM);
1203 ✗ return AVERROR(ENOMEM);
1204 }
1205 23665 avio_write(s, bp.str, bp.len);
1206 23665 av_bprint_finalize(&bp, NULL);
1207 23665 return bp.len;
1208 }
1209
1210 23665 int avio_printf(AVIOContext *s, const char *fmt, ...)
1211 {
1212 va_list ap;
1213 int ret;
1214
1215 23665 va_start(ap, fmt);
1216 23665 ret = avio_vprintf(s, fmt, ap);
1217 23665 va_end(ap);
1218
1219 23665 return ret;
1220 }
1221
1222 485 void avio_print_string_array(AVIOContext *s, const char *const strings[])
1223 {
1224
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 1940 for(; *strings; strings++)
1225 1455 avio_write(s, (const unsigned char *)*strings, strlen(*strings));
1226 485 }
1227
1228 ✗ int avio_pause(AVIOContext *s, int pause)
1229 {
1230 ✗ if (!s->read_pause)
1231 ✗ return AVERROR(ENOSYS);
1232 ✗ return s->read_pause(s->opaque, pause);
1233 }
1234
1235 315 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1236 int64_t timestamp, int flags)
1237 {
1238 int64_t ret;
1239
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 315 if (!s->read_seek)
1240 315 return AVERROR(ENOSYS);
1241 ✗ ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1242 ✗ if (ret >= 0) {
1243 int64_t pos;
1244 ✗ s->buf_ptr = s->buf_end; // Flush buffer
1245 ✗ pos = s->seek(s->opaque, 0, SEEK_CUR);
1246 ✗ if (pos >= 0)
1247 ✗ s->pos = pos;
1248 ✗ else if (pos != AVERROR(ENOSYS))
1249 ✗ ret = pos;
1250 }
1251 ✗ return ret;
1252 }
1253
1254 74 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1255 {
1256 int ret;
1257 char buf[1024];
1258
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 8133 while (max_size) {
1259 8131 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1260
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 8131 if (ret == AVERROR_EOF)
1261 72 return 0;
1262
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 8059 if (ret <= 0)
1263 ✗ return ret;
1264 8059 av_bprint_append_data(pb, buf, ret);
1265
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 8059 if (!av_bprint_is_complete(pb))
1266 ✗ return AVERROR(ENOMEM);
1267 8059 max_size -= ret;
1268 }
1269 2 return 0;
1270 }
1271
1272 /* output in a dynamic buffer */
1273
1274 typedef struct DynBuffer {
1275 int pos, size, allocated_size;
1276 uint8_t *buffer;
1277 int io_buffer_size;
1278 uint8_t io_buffer[1];
1279 } DynBuffer;
1280
1281 34909 static int dyn_buf_write(void *opaque, const uint8_t *buf, int buf_size)
1282 {
1283 34909 DynBuffer *d = opaque;
1284 unsigned new_size;
1285
1286 /* reallocate buffer if needed */
1287 34909 new_size = (unsigned)d->pos + buf_size;
1288
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 34909 if (new_size < d->pos || new_size > INT_MAX)
1289 ✗ return AVERROR(ERANGE);
1290
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 34909 if (new_size > d->allocated_size) {
1291 18511 unsigned new_allocated_size = d->allocated_size ? d->allocated_size
1292
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 8275 : new_size;
1293 int err;
1294
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 11549 while (new_size > new_allocated_size)
1295 3274 new_allocated_size += new_allocated_size / 2 + 1;
1296
1297
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 8275 new_allocated_size = FFMIN(new_allocated_size, INT_MAX);
1298
1299
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 8275 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1300 ✗ d->allocated_size = 0;
1301 ✗ d->size = 0;
1302 ✗ return err;
1303 }
1304 8275 d->allocated_size = new_allocated_size;
1305 }
1306 34909 memcpy(d->buffer + d->pos, buf, buf_size);
1307 34909 d->pos = new_size;
1308
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 34909 if (d->pos > d->size)
1309 34893 d->size = d->pos;
1310 34909 return buf_size;
1311 }
1312
1313 265 static int dyn_packet_buf_write(void *opaque, const uint8_t *buf, int buf_size)
1314 {
1315 unsigned char buf1[4];
1316 int ret;
1317
1318 /* packetized write: output the header */
1319 265 AV_WB32(buf1, buf_size);
1320 265 ret = dyn_buf_write(opaque, buf1, 4);
1321
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 265 if (ret < 0)
1322 ✗ return ret;
1323
1324 /* then the data */
1325 265 return dyn_buf_write(opaque, buf, buf_size);
1326 }
1327
1328 279 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1329 {
1330 279 DynBuffer *d = opaque;
1331
1332
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 279 if (whence == SEEK_CUR)
1333 ✗ offset += d->pos;
1334
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 279 else if (whence == SEEK_END)
1335 ✗ offset += d->size;
1336
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 279 if (offset < 0)
1337 ✗ return AVERROR(EINVAL);
1338
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 279 if (offset > INT_MAX)
1339 ✗ return AVERROR(ERANGE);
1340 279 d->pos = offset;
1341 279 return 0;
1342 }
1343
1344 19417 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1345 {
1346 struct { FFIOContext pb; DynBuffer d; } *ret;
1347 DynBuffer *d;
1348
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 19417 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1349
1350 if (sizeof(*ret) + io_buffer_size < io_buffer_size)
1351 return AVERROR(ERANGE);
1352 19417 ret = av_mallocz(sizeof(*ret) + io_buffer_size);
1353
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 19417 if (!ret)
1354 ✗ return AVERROR(ENOMEM);
1355 19417 d = &ret->d;
1356 19417 d->io_buffer_size = io_buffer_size;
1357
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 19417 ffio_init_context(&ret->pb, d->io_buffer, d->io_buffer_size, 1, d, NULL,
1358 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1359 max_packet_size ? NULL : dyn_buf_seek);
1360 19417 *s = &ret->pb.pub;
1361 19417 (*s)->max_packet_size = max_packet_size;
1362 19417 return 0;
1363 }
1364
1365 19256 int avio_open_dyn_buf(AVIOContext **s)
1366 {
1367 19256 return url_open_dyn_buf_internal(s, 0);
1368 }
1369
1370 38 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1371 {
1372
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 38 if (max_packet_size <= 0)
1373 ✗ return AVERROR(EINVAL);
1374 38 return url_open_dyn_buf_internal(s, max_packet_size);
1375 }
1376
1377 23336 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1378 {
1379 DynBuffer *d;
1380
1381
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 23336 if (!s) {
1382 ✗ *pbuffer = NULL;
1383 ✗ return 0;
1384 }
1385 23336 d = s->opaque;
1386
1387
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 23336 if (!s->error && !d->size) {
1388 22633 *pbuffer = d->io_buffer;
1389 22633 return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer;
1390 }
1391
1392 703 avio_flush(s);
1393
1394 703 *pbuffer = d->buffer;
1395
1396 703 return d->size;
1397 }
1398
1399 21484 void ffio_reset_dyn_buf(AVIOContext *s)
1400 {
1401 21484 DynBuffer *d = s->opaque;
1402 21484 int max_packet_size = s->max_packet_size;
1403
1404 21484 ffio_init_context(ffiocontext(s), d->io_buffer, d->io_buffer_size,
1405 1, d, NULL, s->write_packet, s->seek);
1406 21484 s->max_packet_size = max_packet_size;
1407 21484 d->pos = d->size = 0;
1408 21484 }
1409
1410 6155 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1411 {
1412 DynBuffer *d;
1413 int size;
1414 6155 int padding = 0;
1415
1416
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 6155 if (!s) {
1417 ✗ *pbuffer = NULL;
1418 ✗ return 0;
1419 }
1420
1421 /* don't attempt to pad fixed-size packet buffers */
1422
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 6155 if (!s->max_packet_size) {
1423 6119 ffio_fill(s, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1424 6119 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1425 }
1426
1427 6155 avio_flush(s);
1428
1429 6155 d = s->opaque;
1430 6155 *pbuffer = d->buffer;
1431 6155 size = d->size;
1432
1433 6155 avio_context_free(&s);
1434
1435 6155 return size - padding;
1436 }
1437
1438 14101 void ffio_free_dyn_buf(AVIOContext **s)
1439 {
1440 DynBuffer *d;
1441
1442
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 14101 if (!*s)
1443 962 return;
1444
1445 13139 d = (*s)->opaque;
1446 13139 av_free(d->buffer);
1447 13139 avio_context_free(s);
1448 }
1449
1450 321 static int null_buf_write(void *opaque, const uint8_t *buf, int buf_size)
1451 {
1452 321 DynBuffer *d = opaque;
1453
1454 321 d->pos += buf_size;
1455
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 321 if (d->pos > d->size)
1456 190 d->size = d->pos;
1457 321 return buf_size;
1458 }
1459
1460 123 int ffio_open_null_buf(AVIOContext **s)
1461 {
1462 123 int ret = url_open_dyn_buf_internal(s, 0);
1463
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 123 if (ret >= 0) {
1464 123 AVIOContext *pb = *s;
1465 123 pb->write_packet = null_buf_write;
1466 }
1467 123 return ret;
1468 }
1469
1470 123 int ffio_close_null_buf(AVIOContext *s)
1471 {
1472 123 DynBuffer *d = s->opaque;
1473 int size;
1474
1475 123 avio_flush(s);
1476
1477 123 size = d->size;
1478
1479 123 avio_context_free(&s);
1480
1481 123 return size;
1482 }
1483