| 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/opt.h" |
| 28 | #include "libavutil/avassert.h" |
| 29 | #include "avformat.h" |
| 30 | #include "avio.h" |
| 31 | #include "avio_internal.h" |
| 32 | #include "internal.h" |
| 33 | #include "url.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 4096 |
| 44 | |
| 45 | static void *ffio_url_child_next(void *obj, void *prev) |
| 46 | { |
| 47 | AVIOContext *s = obj; |
| 48 | return prev ? NULL : s->opaque; |
| 49 | } |
| 50 | |
| 51 | static const AVClass *ffio_url_child_class_next(const AVClass *prev) |
| 52 | { |
| 53 | return prev ? NULL : &ffurl_context_class; |
| 54 | } |
| 55 | |
| 56 | static const AVOption ffio_url_options[] = { |
| 57 | { NULL }, |
| 58 | }; |
| 59 | |
| 60 | const AVClass ffio_url_class = { |
| 61 | .class_name = "AVIOContext", |
| 62 | .item_name = av_default_item_name, |
| 63 | .version = LIBAVUTIL_VERSION_INT, |
| 64 | .option = ffio_url_options, |
| 65 | .child_next = ffio_url_child_next, |
| 66 | .child_class_next = ffio_url_child_class_next, |
| 67 | }; |
| 68 | |
| 69 | static void fill_buffer(AVIOContext *s); |
| 70 | static int url_resetbuf(AVIOContext *s, int flags); |
| 71 | |
| 72 | int ffio_init_context(AVIOContext *s, |
| 73 | unsigned char *buffer, |
| 74 | int buffer_size, |
| 75 | int write_flag, |
| 76 | void *opaque, |
| 77 | int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 78 | int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 79 | int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 80 | { |
| 81 | s->buffer = buffer; |
| 82 | s->orig_buffer_size = |
| 83 | s->buffer_size = buffer_size; |
| 84 | s->buf_ptr = buffer; |
| 85 | s->opaque = opaque; |
| 86 | s->direct = 0; |
| 87 | |
| 88 | url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); |
| 89 | |
| 90 | s->write_packet = write_packet; |
| 91 | s->read_packet = read_packet; |
| 92 | s->seek = seek; |
| 93 | s->pos = 0; |
| 94 | s->must_flush = 0; |
| 95 | s->eof_reached = 0; |
| 96 | s->error = 0; |
| 97 | s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0; |
| 98 | s->max_packet_size = 0; |
| 99 | s->update_checksum = NULL; |
| 100 | |
| 101 | if (!read_packet && !write_flag) { |
| 102 | s->pos = buffer_size; |
| 103 | s->buf_end = s->buffer + buffer_size; |
| 104 | } |
| 105 | s->read_pause = NULL; |
| 106 | s->read_seek = NULL; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | AVIOContext *avio_alloc_context( |
| 112 | unsigned char *buffer, |
| 113 | int buffer_size, |
| 114 | int write_flag, |
| 115 | void *opaque, |
| 116 | int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 117 | int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 118 | int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 119 | { |
| 120 | AVIOContext *s = av_mallocz(sizeof(AVIOContext)); |
| 121 | if (!s) |
| 122 | return NULL; |
| 123 | ffio_init_context(s, buffer, buffer_size, write_flag, opaque, |
| 124 | read_packet, write_packet, seek); |
| 125 | return s; |
| 126 | } |
| 127 | |
| 128 | static void writeout(AVIOContext *s, const uint8_t *data, int len) |
| 129 | { |
| 130 | if (s->write_packet && !s->error) { |
| 131 | int ret = s->write_packet(s->opaque, (uint8_t *)data, len); |
| 132 | if (ret < 0) { |
| 133 | s->error = ret; |
| 134 | } |
| 135 | } |
| 136 | s->writeout_count ++; |
| 137 | s->pos += len; |
| 138 | } |
| 139 | |
| 140 | static void flush_buffer(AVIOContext *s) |
| 141 | { |
| 142 | if (s->write_flag && s->buf_ptr > s->buffer) { |
| 143 | writeout(s, s->buffer, s->buf_ptr - s->buffer); |
| 144 | if (s->update_checksum) { |
| 145 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| 146 | s->buf_ptr - s->checksum_ptr); |
| 147 | s->checksum_ptr = s->buffer; |
| 148 | } |
| 149 | } |
| 150 | s->buf_ptr = s->buffer; |
| 151 | if (!s->write_flag) |
| 152 | s->buf_end = s->buffer; |
| 153 | } |
| 154 | |
| 155 | void avio_w8(AVIOContext *s, int b) |
| 156 | { |
| 157 | av_assert2(b>=-128 && b<=255); |
| 158 | *s->buf_ptr++ = b; |
| 159 | if (s->buf_ptr >= s->buf_end) |
| 160 | flush_buffer(s); |
| 161 | } |
| 162 | |
| 163 | void ffio_fill(AVIOContext *s, int b, int count) |
| 164 | { |
| 165 | while (count > 0) { |
| 166 | int len = FFMIN(s->buf_end - s->buf_ptr, count); |
| 167 | memset(s->buf_ptr, b, len); |
| 168 | s->buf_ptr += len; |
| 169 | |
| 170 | if (s->buf_ptr >= s->buf_end) |
| 171 | flush_buffer(s); |
| 172 | |
| 173 | count -= len; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | void avio_write(AVIOContext *s, const unsigned char *buf, int size) |
| 178 | { |
| 179 | if (s->direct && !s->update_checksum) { |
| 180 | avio_flush(s); |
| 181 | writeout(s, buf, size); |
| 182 | return; |
| 183 | } |
| 184 | while (size > 0) { |
| 185 | int len = FFMIN(s->buf_end - s->buf_ptr, size); |
| 186 | memcpy(s->buf_ptr, buf, len); |
| 187 | s->buf_ptr += len; |
| 188 | |
| 189 | if (s->buf_ptr >= s->buf_end) |
| 190 | flush_buffer(s); |
| 191 | |
| 192 | buf += len; |
| 193 | size -= len; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | void avio_flush(AVIOContext *s) |
| 198 | { |
| 199 | flush_buffer(s); |
| 200 | s->must_flush = 0; |
| 201 | } |
| 202 | |
| 203 | int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) |
| 204 | { |
| 205 | int64_t offset1; |
| 206 | int64_t pos; |
| 207 | int force = whence & AVSEEK_FORCE; |
| 208 | int buffer_size; |
| 209 | whence &= ~AVSEEK_FORCE; |
| 210 | |
| 211 | if(!s) |
| 212 | return AVERROR(EINVAL); |
| 213 | |
| 214 | buffer_size = s->buf_end - s->buffer; |
| 215 | pos = s->pos - (s->write_flag ? 0 : buffer_size); |
| 216 | |
| 217 | if (whence != SEEK_CUR && whence != SEEK_SET) |
| 218 | return AVERROR(EINVAL); |
| 219 | |
| 220 | if (whence == SEEK_CUR) { |
| 221 | offset1 = pos + (s->buf_ptr - s->buffer); |
| 222 | if (offset == 0) |
| 223 | return offset1; |
| 224 | offset += offset1; |
| 225 | } |
| 226 | offset1 = offset - pos; |
| 227 | if (!s->must_flush && (!s->direct || !s->seek) && |
| 228 | offset1 >= 0 && offset1 <= buffer_size) { |
| 229 | /* can do the seek inside the buffer */ |
| 230 | s->buf_ptr = s->buffer + offset1; |
| 231 | } else if ((!s->seekable || |
| 232 | offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && |
| 233 | !s->write_flag && offset1 >= 0 && |
| 234 | (!s->direct || !s->seek) && |
| 235 | (whence != SEEK_END || force)) { |
| 236 | while(s->pos < offset && !s->eof_reached) |
| 237 | fill_buffer(s); |
| 238 | if (s->eof_reached) |
| 239 | return AVERROR_EOF; |
| 240 | s->buf_ptr = s->buf_end + offset - s->pos; |
| 241 | } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) { |
| 242 | int64_t res; |
| 243 | |
| 244 | pos -= FFMIN(buffer_size>>1, pos); |
| 245 | if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0) |
| 246 | return res; |
| 247 | s->buf_end = |
| 248 | s->buf_ptr = s->buffer; |
| 249 | s->pos = pos; |
| 250 | s->eof_reached = 0; |
| 251 | fill_buffer(s); |
| 252 | return avio_seek(s, offset, SEEK_SET | force); |
| 253 | } else { |
| 254 | int64_t res; |
| 255 | if (s->write_flag) { |
| 256 | flush_buffer(s); |
| 257 | s->must_flush = 1; |
| 258 | } |
| 259 | if (!s->seek) |
| 260 | return AVERROR(EPIPE); |
| 261 | if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0) |
| 262 | return res; |
| 263 | s->seek_count ++; |
| 264 | if (!s->write_flag) |
| 265 | s->buf_end = s->buffer; |
| 266 | s->buf_ptr = s->buffer; |
| 267 | s->pos = offset; |
| 268 | } |
| 269 | s->eof_reached = 0; |
| 270 | return offset; |
| 271 | } |
| 272 | |
| 273 | int64_t avio_skip(AVIOContext *s, int64_t offset) |
| 274 | { |
| 275 | return avio_seek(s, offset, SEEK_CUR); |
| 276 | } |
| 277 | |
| 278 | int64_t avio_size(AVIOContext *s) |
| 279 | { |
| 280 | int64_t size; |
| 281 | |
| 282 | if (!s) |
| 283 | return AVERROR(EINVAL); |
| 284 | |
| 285 | if (!s->seek) |
| 286 | return AVERROR(ENOSYS); |
| 287 | size = s->seek(s->opaque, 0, AVSEEK_SIZE); |
| 288 | if (size < 0) { |
| 289 | if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0) |
| 290 | return size; |
| 291 | size++; |
| 292 | s->seek(s->opaque, s->pos, SEEK_SET); |
| 293 | } |
| 294 | return size; |
| 295 | } |
| 296 | |
| 297 | int avio_feof(AVIOContext *s) |
| 298 | { |
| 299 | if(!s) |
| 300 | return 0; |
| 301 | if(s->eof_reached){ |
| 302 | s->eof_reached=0; |
| 303 | fill_buffer(s); |
| 304 | } |
| 305 | return s->eof_reached; |
| 306 | } |
| 307 | |
| 308 | #if FF_API_URL_FEOF |
| 309 | int url_feof(AVIOContext *s) |
| 310 | { |
| 311 | return avio_feof(s); |
| 312 | } |
| 313 | #endif |
| 314 | |
| 315 | void avio_wl32(AVIOContext *s, unsigned int val) |
| 316 | { |
| 317 | avio_w8(s, (uint8_t) val ); |
| 318 | avio_w8(s, (uint8_t)(val >> 8 )); |
| 319 | avio_w8(s, (uint8_t)(val >> 16)); |
| 320 | avio_w8(s, val >> 24 ); |
| 321 | } |
| 322 | |
| 323 | void avio_wb32(AVIOContext *s, unsigned int val) |
| 324 | { |
| 325 | avio_w8(s, val >> 24 ); |
| 326 | avio_w8(s, (uint8_t)(val >> 16)); |
| 327 | avio_w8(s, (uint8_t)(val >> 8 )); |
| 328 | avio_w8(s, (uint8_t) val ); |
| 329 | } |
| 330 | |
| 331 | int avio_put_str(AVIOContext *s, const char *str) |
| 332 | { |
| 333 | int len = 1; |
| 334 | if (str) { |
| 335 | len += strlen(str); |
| 336 | avio_write(s, (const unsigned char *) str, len); |
| 337 | } else |
| 338 | avio_w8(s, 0); |
| 339 | return len; |
| 340 | } |
| 341 | |
| 342 | int avio_put_str16le(AVIOContext *s, const char *str) |
| 343 | { |
| 344 | const uint8_t *q = str; |
| 345 | int ret = 0; |
| 346 | int err = 0; |
| 347 | |
| 348 | while (*q) { |
| 349 | uint32_t ch; |
| 350 | uint16_t tmp; |
| 351 | |
| 352 | GET_UTF8(ch, *q++, goto invalid;) |
| 353 | PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;) |
| 354 | continue; |
| 355 | invalid: |
| 356 | av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16le\n"); |
| 357 | err = AVERROR(EINVAL); |
| 358 | } |
| 359 | avio_wl16(s, 0); |
| 360 | if (err) |
| 361 | return err; |
| 362 | ret += 2; |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | int ff_get_v_length(uint64_t val) |
| 367 | { |
| 368 | int i = 1; |
| 369 | |
| 370 | while (val >>= 7) |
| 371 | i++; |
| 372 | |
| 373 | return i; |
| 374 | } |
| 375 | |
| 376 | void ff_put_v(AVIOContext *bc, uint64_t val) |
| 377 | { |
| 378 | int i = ff_get_v_length(val); |
| 379 | |
| 380 | while (--i > 0) |
| 381 | avio_w8(bc, 128 | (uint8_t)(val >> (7*i))); |
| 382 | |
| 383 | avio_w8(bc, val & 127); |
| 384 | } |
| 385 | |
| 386 | void avio_wl64(AVIOContext *s, uint64_t val) |
| 387 | { |
| 388 | avio_wl32(s, (uint32_t)(val & 0xffffffff)); |
| 389 | avio_wl32(s, (uint32_t)(val >> 32)); |
| 390 | } |
| 391 | |
| 392 | void avio_wb64(AVIOContext *s, uint64_t val) |
| 393 | { |
| 394 | avio_wb32(s, (uint32_t)(val >> 32)); |
| 395 | avio_wb32(s, (uint32_t)(val & 0xffffffff)); |
| 396 | } |
| 397 | |
| 398 | void avio_wl16(AVIOContext *s, unsigned int val) |
| 399 | { |
| 400 | avio_w8(s, (uint8_t)val); |
| 401 | avio_w8(s, (int)val >> 8); |
| 402 | } |
| 403 | |
| 404 | void avio_wb16(AVIOContext *s, unsigned int val) |
| 405 | { |
| 406 | avio_w8(s, (int)val >> 8); |
| 407 | avio_w8(s, (uint8_t)val); |
| 408 | } |
| 409 | |
| 410 | void avio_wl24(AVIOContext *s, unsigned int val) |
| 411 | { |
| 412 | avio_wl16(s, val & 0xffff); |
| 413 | avio_w8(s, (int)val >> 16); |
| 414 | } |
| 415 | |
| 416 | void avio_wb24(AVIOContext *s, unsigned int val) |
| 417 | { |
| 418 | avio_wb16(s, (int)val >> 8); |
| 419 | avio_w8(s, (uint8_t)val); |
| 420 | } |
| 421 | |
| 422 | /* Input stream */ |
| 423 | |
| 424 | static void fill_buffer(AVIOContext *s) |
| 425 | { |
| 426 | int max_buffer_size = s->max_packet_size ? |
| 427 | s->max_packet_size : IO_BUFFER_SIZE; |
| 428 | uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ? |
| 429 | s->buf_end : s->buffer; |
| 430 | int len = s->buffer_size - (dst - s->buffer); |
| 431 | |
| 432 | /* can't fill the buffer without read_packet, just set EOF if appropriate */ |
| 433 | if (!s->read_packet && s->buf_ptr >= s->buf_end) |
| 434 | s->eof_reached = 1; |
| 435 | |
| 436 | /* no need to do anything if EOF already reached */ |
| 437 | if (s->eof_reached) |
| 438 | return; |
| 439 | |
| 440 | if (s->update_checksum && dst == s->buffer) { |
| 441 | if (s->buf_end > s->checksum_ptr) |
| 442 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| 443 | s->buf_end - s->checksum_ptr); |
| 444 | s->checksum_ptr = s->buffer; |
| 445 | } |
| 446 | |
| 447 | /* make buffer smaller in case it ended up large after probing */ |
| 448 | if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) { |
| 449 | if (dst == s->buffer) { |
| 450 | ffio_set_buf_size(s, s->orig_buffer_size); |
| 451 | |
| 452 | s->checksum_ptr = dst = s->buffer; |
| 453 | } |
| 454 | av_assert0(len >= s->orig_buffer_size); |
| 455 | len = s->orig_buffer_size; |
| 456 | } |
| 457 | |
| 458 | if (s->read_packet) |
| 459 | len = s->read_packet(s->opaque, dst, len); |
| 460 | else |
| 461 | len = 0; |
| 462 | if (len <= 0) { |
| 463 | /* do not modify buffer if EOF reached so that a seek back can |
| 464 | be done without rereading data */ |
| 465 | s->eof_reached = 1; |
| 466 | if (len < 0) |
| 467 | s->error = len; |
| 468 | } else { |
| 469 | s->pos += len; |
| 470 | s->buf_ptr = dst; |
| 471 | s->buf_end = dst + len; |
| 472 | s->bytes_read += len; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, |
| 477 | unsigned int len) |
| 478 | { |
| 479 | return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len); |
| 480 | } |
| 481 | |
| 482 | unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf, |
| 483 | unsigned int len) |
| 484 | { |
| 485 | return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len); |
| 486 | } |
| 487 | |
| 488 | unsigned long ffio_get_checksum(AVIOContext *s) |
| 489 | { |
| 490 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, |
| 491 | s->buf_ptr - s->checksum_ptr); |
| 492 | s->update_checksum = NULL; |
| 493 | return s->checksum; |
| 494 | } |
| 495 | |
| 496 | void ffio_init_checksum(AVIOContext *s, |
| 497 | unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
| 498 | unsigned long checksum) |
| 499 | { |
| 500 | s->update_checksum = update_checksum; |
| 501 | if (s->update_checksum) { |
| 502 | s->checksum = checksum; |
| 503 | s->checksum_ptr = s->buf_ptr; |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | /* XXX: put an inline version */ |
| 508 | int avio_r8(AVIOContext *s) |
| 509 | { |
| 510 | if (s->buf_ptr >= s->buf_end) |
| 511 | fill_buffer(s); |
| 512 | if (s->buf_ptr < s->buf_end) |
| 513 | return *s->buf_ptr++; |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | int avio_read(AVIOContext *s, unsigned char *buf, int size) |
| 518 | { |
| 519 | int len, size1; |
| 520 | |
| 521 | size1 = size; |
| 522 | while (size > 0) { |
| 523 | len = s->buf_end - s->buf_ptr; |
| 524 | if (len > size) |
| 525 | len = size; |
| 526 | if (len == 0 || s->write_flag) { |
| 527 | if((s->direct || size > s->buffer_size) && !s->update_checksum){ |
| 528 | if(s->read_packet) |
| 529 | len = s->read_packet(s->opaque, buf, size); |
| 530 | if (len <= 0) { |
| 531 | /* do not modify buffer if EOF reached so that a seek back can |
| 532 | be done without rereading data */ |
| 533 | s->eof_reached = 1; |
| 534 | if(len<0) |
| 535 | s->error= len; |
| 536 | break; |
| 537 | } else { |
| 538 | s->pos += len; |
| 539 | s->bytes_read += len; |
| 540 | size -= len; |
| 541 | buf += len; |
| 542 | s->buf_ptr = s->buffer; |
| 543 | s->buf_end = s->buffer/* + len*/; |
| 544 | } |
| 545 | } else { |
| 546 | fill_buffer(s); |
| 547 | len = s->buf_end - s->buf_ptr; |
| 548 | if (len == 0) |
| 549 | break; |
| 550 | } |
| 551 | } else { |
| 552 | memcpy(buf, s->buf_ptr, len); |
| 553 | buf += len; |
| 554 | s->buf_ptr += len; |
| 555 | size -= len; |
| 556 | } |
| 557 | } |
| 558 | if (size1 == size) { |
| 559 | if (s->error) return s->error; |
| 560 | if (avio_feof(s)) return AVERROR_EOF; |
| 561 | } |
| 562 | return size1 - size; |
| 563 | } |
| 564 | |
| 565 | int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data) |
| 566 | { |
| 567 | if (s->buf_end - s->buf_ptr >= size && !s->write_flag) { |
| 568 | *data = s->buf_ptr; |
| 569 | s->buf_ptr += size; |
| 570 | return size; |
| 571 | } else { |
| 572 | *data = buf; |
| 573 | return avio_read(s, buf, size); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) |
| 578 | { |
| 579 | int len; |
| 580 | |
| 581 | if (size < 0) |
| 582 | return -1; |
| 583 | |
| 584 | if (s->read_packet && s->write_flag) { |
| 585 | len = s->read_packet(s->opaque, buf, size); |
| 586 | if (len > 0) |
| 587 | s->pos += len; |
| 588 | return len; |
| 589 | } |
| 590 | |
| 591 | len = s->buf_end - s->buf_ptr; |
| 592 | if (len == 0) { |
| 593 | /* Reset the buf_end pointer to the start of the buffer, to make sure |
| 594 | * the fill_buffer call tries to read as much data as fits into the |
| 595 | * full buffer, instead of just what space is left after buf_end. |
| 596 | * This avoids returning partial packets at the end of the buffer, |
| 597 | * for packet based inputs. |
| 598 | */ |
| 599 | s->buf_end = s->buf_ptr = s->buffer; |
| 600 | fill_buffer(s); |
| 601 | len = s->buf_end - s->buf_ptr; |
| 602 | } |
| 603 | if (len > size) |
| 604 | len = size; |
| 605 | memcpy(buf, s->buf_ptr, len); |
| 606 | s->buf_ptr += len; |
| 607 | if (!len) { |
| 608 | if (s->error) return s->error; |
| 609 | if (avio_feof(s)) return AVERROR_EOF; |
| 610 | } |
| 611 | return len; |
| 612 | } |
| 613 | |
| 614 | unsigned int avio_rl16(AVIOContext *s) |
| 615 | { |
| 616 | unsigned int val; |
| 617 | val = avio_r8(s); |
| 618 | val |= avio_r8(s) << 8; |
| 619 | return val; |
| 620 | } |
| 621 | |
| 622 | unsigned int avio_rl24(AVIOContext *s) |
| 623 | { |
| 624 | unsigned int val; |
| 625 | val = avio_rl16(s); |
| 626 | val |= avio_r8(s) << 16; |
| 627 | return val; |
| 628 | } |
| 629 | |
| 630 | unsigned int avio_rl32(AVIOContext *s) |
| 631 | { |
| 632 | unsigned int val; |
| 633 | val = avio_rl16(s); |
| 634 | val |= avio_rl16(s) << 16; |
| 635 | return val; |
| 636 | } |
| 637 | |
| 638 | uint64_t avio_rl64(AVIOContext *s) |
| 639 | { |
| 640 | uint64_t val; |
| 641 | val = (uint64_t)avio_rl32(s); |
| 642 | val |= (uint64_t)avio_rl32(s) << 32; |
| 643 | return val; |
| 644 | } |
| 645 | |
| 646 | unsigned int avio_rb16(AVIOContext *s) |
| 647 | { |
| 648 | unsigned int val; |
| 649 | val = avio_r8(s) << 8; |
| 650 | val |= avio_r8(s); |
| 651 | return val; |
| 652 | } |
| 653 | |
| 654 | unsigned int avio_rb24(AVIOContext *s) |
| 655 | { |
| 656 | unsigned int val; |
| 657 | val = avio_rb16(s) << 8; |
| 658 | val |= avio_r8(s); |
| 659 | return val; |
| 660 | } |
| 661 | unsigned int avio_rb32(AVIOContext *s) |
| 662 | { |
| 663 | unsigned int val; |
| 664 | val = avio_rb16(s) << 16; |
| 665 | val |= avio_rb16(s); |
| 666 | return val; |
| 667 | } |
| 668 | |
| 669 | int ff_get_line(AVIOContext *s, char *buf, int maxlen) |
| 670 | { |
| 671 | int i = 0; |
| 672 | char c; |
| 673 | |
| 674 | do { |
| 675 | c = avio_r8(s); |
| 676 | if (c && i < maxlen-1) |
| 677 | buf[i++] = c; |
| 678 | } while (c != '\n' && c != '\r' && c); |
| 679 | if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s)) |
| 680 | avio_skip(s, -1); |
| 681 | |
| 682 | buf[i] = 0; |
| 683 | return i; |
| 684 | } |
| 685 | |
| 686 | int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen) |
| 687 | { |
| 688 | int i; |
| 689 | |
| 690 | if (buflen <= 0) |
| 691 | return AVERROR(EINVAL); |
| 692 | // reserve 1 byte for terminating 0 |
| 693 | buflen = FFMIN(buflen - 1, maxlen); |
| 694 | for (i = 0; i < buflen; i++) |
| 695 | if (!(buf[i] = avio_r8(s))) |
| 696 | return i + 1; |
| 697 | buf[i] = 0; |
| 698 | for (; i < maxlen; i++) |
| 699 | if (!avio_r8(s)) |
| 700 | return i + 1; |
| 701 | return maxlen; |
| 702 | } |
| 703 | |
| 704 | #define GET_STR16(type, read) \ |
| 705 | int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\ |
| 706 | {\ |
| 707 | char* q = buf;\ |
| 708 | int ret = 0;\ |
| 709 | if (buflen <= 0) \ |
| 710 | return AVERROR(EINVAL); \ |
| 711 | while (ret + 1 < maxlen) {\ |
| 712 | uint8_t tmp;\ |
| 713 | uint32_t ch;\ |
| 714 | GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\ |
| 715 | if (!ch)\ |
| 716 | break;\ |
| 717 | PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\ |
| 718 | }\ |
| 719 | *q = 0;\ |
| 720 | return ret;\ |
| 721 | }\ |
| 722 | |
| 723 | GET_STR16(le, avio_rl16) |
| 724 | GET_STR16(be, avio_rb16) |
| 725 | |
| 726 | #undef GET_STR16 |
| 727 | |
| 728 | uint64_t avio_rb64(AVIOContext *s) |
| 729 | { |
| 730 | uint64_t val; |
| 731 | val = (uint64_t)avio_rb32(s) << 32; |
| 732 | val |= (uint64_t)avio_rb32(s); |
| 733 | return val; |
| 734 | } |
| 735 | |
| 736 | uint64_t ffio_read_varlen(AVIOContext *bc){ |
| 737 | uint64_t val = 0; |
| 738 | int tmp; |
| 739 | |
| 740 | do{ |
| 741 | tmp = avio_r8(bc); |
| 742 | val= (val<<7) + (tmp&127); |
| 743 | }while(tmp&128); |
| 744 | return val; |
| 745 | } |
| 746 | |
| 747 | int ffio_fdopen(AVIOContext **s, URLContext *h) |
| 748 | { |
| 749 | uint8_t *buffer; |
| 750 | int buffer_size, max_packet_size; |
| 751 | |
| 752 | max_packet_size = h->max_packet_size; |
| 753 | if (max_packet_size) { |
| 754 | buffer_size = max_packet_size; /* no need to bufferize more than one packet */ |
| 755 | } else { |
| 756 | buffer_size = IO_BUFFER_SIZE; |
| 757 | } |
| 758 | buffer = av_malloc(buffer_size); |
| 759 | if (!buffer) |
| 760 | return AVERROR(ENOMEM); |
| 761 | |
| 762 | *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h, |
| 763 | (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek); |
| 764 | if (!*s) { |
| 765 | av_free(buffer); |
| 766 | return AVERROR(ENOMEM); |
| 767 | } |
| 768 | (*s)->direct = h->flags & AVIO_FLAG_DIRECT; |
| 769 | (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL; |
| 770 | (*s)->max_packet_size = max_packet_size; |
| 771 | if(h->prot) { |
| 772 | (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; |
| 773 | (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; |
| 774 | } |
| 775 | (*s)->av_class = &ffio_url_class; |
| 776 | return 0; |
| 777 | } |
| 778 | |
| 779 | int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size) |
| 780 | { |
| 781 | uint8_t *buffer; |
| 782 | int max_buffer_size = s->max_packet_size ? |
| 783 | s->max_packet_size : IO_BUFFER_SIZE; |
| 784 | int filled = s->buf_end - s->buffer; |
| 785 | |
| 786 | buf_size += s->buf_ptr - s->buffer + max_buffer_size; |
| 787 | |
| 788 | if (buf_size < filled || s->seekable) |
| 789 | return 0; |
| 790 | av_assert0(!s->write_flag); |
| 791 | |
| 792 | buffer = av_malloc(buf_size); |
| 793 | if (!buffer) |
| 794 | return AVERROR(ENOMEM); |
| 795 | |
| 796 | memcpy(buffer, s->buffer, filled); |
| 797 | av_free(s->buffer); |
| 798 | s->buf_ptr = buffer + (s->buf_ptr - s->buffer); |
| 799 | s->buf_end = buffer + (s->buf_end - s->buffer); |
| 800 | s->buffer = buffer; |
| 801 | s->buffer_size = buf_size; |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | int ffio_set_buf_size(AVIOContext *s, int buf_size) |
| 806 | { |
| 807 | uint8_t *buffer; |
| 808 | buffer = av_malloc(buf_size); |
| 809 | if (!buffer) |
| 810 | return AVERROR(ENOMEM); |
| 811 | |
| 812 | av_free(s->buffer); |
| 813 | s->buffer = buffer; |
| 814 | s->orig_buffer_size = |
| 815 | s->buffer_size = buf_size; |
| 816 | s->buf_ptr = buffer; |
| 817 | url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); |
| 818 | return 0; |
| 819 | } |
| 820 | |
| 821 | static int url_resetbuf(AVIOContext *s, int flags) |
| 822 | { |
| 823 | av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ); |
| 824 | |
| 825 | if (flags & AVIO_FLAG_WRITE) { |
| 826 | s->buf_end = s->buffer + s->buffer_size; |
| 827 | s->write_flag = 1; |
| 828 | } else { |
| 829 | s->buf_end = s->buffer; |
| 830 | s->write_flag = 0; |
| 831 | } |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size) |
| 836 | { |
| 837 | int64_t buffer_start; |
| 838 | int buffer_size; |
| 839 | int overlap, new_size, alloc_size; |
| 840 | uint8_t *buf = *bufp; |
| 841 | |
| 842 | if (s->write_flag) { |
| 843 | av_freep(bufp); |
| 844 | return AVERROR(EINVAL); |
| 845 | } |
| 846 | |
| 847 | buffer_size = s->buf_end - s->buffer; |
| 848 | |
| 849 | /* the buffers must touch or overlap */ |
| 850 | if ((buffer_start = s->pos - buffer_size) > buf_size) { |
| 851 | av_freep(bufp); |
| 852 | return AVERROR(EINVAL); |
| 853 | } |
| 854 | |
| 855 | overlap = buf_size - buffer_start; |
| 856 | new_size = buf_size + buffer_size - overlap; |
| 857 | |
| 858 | alloc_size = FFMAX(s->buffer_size, new_size); |
| 859 | if (alloc_size > buf_size) |
| 860 | if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size))) |
| 861 | return AVERROR(ENOMEM); |
| 862 | |
| 863 | if (new_size > buf_size) { |
| 864 | memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); |
| 865 | buf_size = new_size; |
| 866 | } |
| 867 | |
| 868 | av_free(s->buffer); |
| 869 | s->buf_ptr = s->buffer = buf; |
| 870 | s->buffer_size = alloc_size; |
| 871 | s->pos = buf_size; |
| 872 | s->buf_end = s->buf_ptr + buf_size; |
| 873 | s->eof_reached = 0; |
| 874 | s->must_flush = 0; |
| 875 | |
| 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | int avio_open(AVIOContext **s, const char *filename, int flags) |
| 880 | { |
| 881 | return avio_open2(s, filename, flags, NULL, NULL); |
| 882 | } |
| 883 | |
| 884 | int avio_open2(AVIOContext **s, const char *filename, int flags, |
| 885 | const AVIOInterruptCB *int_cb, AVDictionary **options) |
| 886 | { |
| 887 | URLContext *h; |
| 888 | int err; |
| 889 | |
| 890 | err = ffurl_open(&h, filename, flags, int_cb, options); |
| 891 | if (err < 0) |
| 892 | return err; |
| 893 | err = ffio_fdopen(s, h); |
| 894 | if (err < 0) { |
| 895 | ffurl_close(h); |
| 896 | return err; |
| 897 | } |
| 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | int avio_close(AVIOContext *s) |
| 902 | { |
| 903 | URLContext *h; |
| 904 | |
| 905 | if (!s) |
| 906 | return 0; |
| 907 | |
| 908 | avio_flush(s); |
| 909 | h = s->opaque; |
| 910 | av_freep(&s->buffer); |
| 911 | if (s->write_flag) |
| 912 | av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count); |
| 913 | else |
| 914 | av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count); |
| 915 | av_free(s); |
| 916 | return ffurl_close(h); |
| 917 | } |
| 918 | |
| 919 | int avio_closep(AVIOContext **s) |
| 920 | { |
| 921 | int ret = avio_close(*s); |
| 922 | *s = NULL; |
| 923 | return ret; |
| 924 | } |
| 925 | |
| 926 | int avio_printf(AVIOContext *s, const char *fmt, ...) |
| 927 | { |
| 928 | va_list ap; |
| 929 | char buf[4096]; |
| 930 | int ret; |
| 931 | |
| 932 | va_start(ap, fmt); |
| 933 | ret = vsnprintf(buf, sizeof(buf), fmt, ap); |
| 934 | va_end(ap); |
| 935 | avio_write(s, buf, strlen(buf)); |
| 936 | return ret; |
| 937 | } |
| 938 | |
| 939 | int avio_pause(AVIOContext *s, int pause) |
| 940 | { |
| 941 | if (!s->read_pause) |
| 942 | return AVERROR(ENOSYS); |
| 943 | return s->read_pause(s->opaque, pause); |
| 944 | } |
| 945 | |
| 946 | int64_t avio_seek_time(AVIOContext *s, int stream_index, |
| 947 | int64_t timestamp, int flags) |
| 948 | { |
| 949 | URLContext *h = s->opaque; |
| 950 | int64_t ret; |
| 951 | if (!s->read_seek) |
| 952 | return AVERROR(ENOSYS); |
| 953 | ret = s->read_seek(h, stream_index, timestamp, flags); |
| 954 | if (ret >= 0) { |
| 955 | int64_t pos; |
| 956 | s->buf_ptr = s->buf_end; // Flush buffer |
| 957 | pos = s->seek(h, 0, SEEK_CUR); |
| 958 | if (pos >= 0) |
| 959 | s->pos = pos; |
| 960 | else if (pos != AVERROR(ENOSYS)) |
| 961 | ret = pos; |
| 962 | } |
| 963 | return ret; |
| 964 | } |
| 965 | |
| 966 | int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size) |
| 967 | { |
| 968 | int ret; |
| 969 | char buf[1024]; |
| 970 | while (max_size) { |
| 971 | ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf))); |
| 972 | if (ret == AVERROR_EOF) |
| 973 | return 0; |
| 974 | if (ret <= 0) |
| 975 | return ret; |
| 976 | av_bprint_append_data(pb, buf, ret); |
| 977 | if (!av_bprint_is_complete(pb)) |
| 978 | return AVERROR(ENOMEM); |
| 979 | max_size -= ret; |
| 980 | } |
| 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | /* output in a dynamic buffer */ |
| 985 | |
| 986 | typedef struct DynBuffer { |
| 987 | int pos, size, allocated_size; |
| 988 | uint8_t *buffer; |
| 989 | int io_buffer_size; |
| 990 | uint8_t io_buffer[1]; |
| 991 | } DynBuffer; |
| 992 | |
| 993 | static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| 994 | { |
| 995 | DynBuffer *d = opaque; |
| 996 | unsigned new_size, new_allocated_size; |
| 997 | |
| 998 | /* reallocate buffer if needed */ |
| 999 | new_size = d->pos + buf_size; |
| 1000 | new_allocated_size = d->allocated_size; |
| 1001 | if (new_size < d->pos || new_size > INT_MAX/2) |
| 1002 | return -1; |
| 1003 | while (new_size > new_allocated_size) { |
| 1004 | if (!new_allocated_size) |
| 1005 | new_allocated_size = new_size; |
| 1006 | else |
| 1007 | new_allocated_size += new_allocated_size / 2 + 1; |
| 1008 | } |
| 1009 | |
| 1010 | if (new_allocated_size > d->allocated_size) { |
| 1011 | int err; |
| 1012 | if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) { |
| 1013 | d->allocated_size = 0; |
| 1014 | d->size = 0; |
| 1015 | return err; |
| 1016 | } |
| 1017 | d->allocated_size = new_allocated_size; |
| 1018 | } |
| 1019 | memcpy(d->buffer + d->pos, buf, buf_size); |
| 1020 | d->pos = new_size; |
| 1021 | if (d->pos > d->size) |
| 1022 | d->size = d->pos; |
| 1023 | return buf_size; |
| 1024 | } |
| 1025 | |
| 1026 | static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| 1027 | { |
| 1028 | unsigned char buf1[4]; |
| 1029 | int ret; |
| 1030 | |
| 1031 | /* packetized write: output the header */ |
| 1032 | AV_WB32(buf1, buf_size); |
| 1033 | ret = dyn_buf_write(opaque, buf1, 4); |
| 1034 | if (ret < 0) |
| 1035 | return ret; |
| 1036 | |
| 1037 | /* then the data */ |
| 1038 | return dyn_buf_write(opaque, buf, buf_size); |
| 1039 | } |
| 1040 | |
| 1041 | static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) |
| 1042 | { |
| 1043 | DynBuffer *d = opaque; |
| 1044 | |
| 1045 | if (whence == SEEK_CUR) |
| 1046 | offset += d->pos; |
| 1047 | else if (whence == SEEK_END) |
| 1048 | offset += d->size; |
| 1049 | if (offset < 0 || offset > 0x7fffffffLL) |
| 1050 | return -1; |
| 1051 | d->pos = offset; |
| 1052 | return 0; |
| 1053 | } |
| 1054 | |
| 1055 | static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size) |
| 1056 | { |
| 1057 | DynBuffer *d; |
| 1058 | unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; |
| 1059 | |
| 1060 | if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size) |
| 1061 | return -1; |
| 1062 | d = av_mallocz(sizeof(DynBuffer) + io_buffer_size); |
| 1063 | if (!d) |
| 1064 | return AVERROR(ENOMEM); |
| 1065 | d->io_buffer_size = io_buffer_size; |
| 1066 | *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL, |
| 1067 | max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
| 1068 | max_packet_size ? NULL : dyn_buf_seek); |
| 1069 | if(!*s) { |
| 1070 | av_free(d); |
| 1071 | return AVERROR(ENOMEM); |
| 1072 | } |
| 1073 | (*s)->max_packet_size = max_packet_size; |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
| 1077 | int avio_open_dyn_buf(AVIOContext **s) |
| 1078 | { |
| 1079 | return url_open_dyn_buf_internal(s, 0); |
| 1080 | } |
| 1081 | |
| 1082 | int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size) |
| 1083 | { |
| 1084 | if (max_packet_size <= 0) |
| 1085 | return -1; |
| 1086 | return url_open_dyn_buf_internal(s, max_packet_size); |
| 1087 | } |
| 1088 | |
| 1089 | int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer) |
| 1090 | { |
| 1091 | DynBuffer *d; |
| 1092 | int size; |
| 1093 | static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; |
| 1094 | int padding = 0; |
| 1095 | |
| 1096 | if (!s) { |
| 1097 | *pbuffer = NULL; |
| 1098 | return 0; |
| 1099 | } |
| 1100 | |
| 1101 | /* don't attempt to pad fixed-size packet buffers */ |
| 1102 | if (!s->max_packet_size) { |
| 1103 | avio_write(s, padbuf, sizeof(padbuf)); |
| 1104 | padding = FF_INPUT_BUFFER_PADDING_SIZE; |
| 1105 | } |
| 1106 | |
| 1107 | avio_flush(s); |
| 1108 | |
| 1109 | d = s->opaque; |
| 1110 | *pbuffer = d->buffer; |
| 1111 | size = d->size; |
| 1112 | av_free(d); |
| 1113 | av_free(s); |
| 1114 | return size - padding; |
| 1115 | } |
| 1116 | |
| 1117 | static int null_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| 1118 | { |
| 1119 | DynBuffer *d = opaque; |
| 1120 | |
| 1121 | d->pos += buf_size; |
| 1122 | if (d->pos > d->size) |
| 1123 | d->size = d->pos; |
| 1124 | return buf_size; |
| 1125 | } |
| 1126 | |
| 1127 | int ffio_open_null_buf(AVIOContext **s) |
| 1128 | { |
| 1129 | int ret = url_open_dyn_buf_internal(s, 0); |
| 1130 | if (ret >= 0) { |
| 1131 | AVIOContext *pb = *s; |
| 1132 | pb->write_packet = null_buf_write; |
| 1133 | } |
| 1134 | return ret; |
| 1135 | } |
| 1136 | |
| 1137 | int ffio_close_null_buf(AVIOContext *s) |
| 1138 | { |
| 1139 | DynBuffer *d = s->opaque; |
| 1140 | int size; |
| 1141 | |
| 1142 | avio_flush(s); |
| 1143 | |
| 1144 | size = d->size; |
| 1145 | av_free(d); |
| 1146 | av_free(s); |
| 1147 | return size; |
| 1148 | } |