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00021 #include "avformat.h"
00022 #include "avio.h"
00023 #include "crc.h"
00024 #include <stdarg.h>
00025
00026 #define IO_BUFFER_SIZE 32768
00027
00028 static void fill_buffer(ByteIOContext *s);
00029
00030 int init_put_byte(ByteIOContext *s,
00031 unsigned char *buffer,
00032 int buffer_size,
00033 int write_flag,
00034 void *opaque,
00035 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
00036 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
00037 offset_t (*seek)(void *opaque, offset_t offset, int whence))
00038 {
00039 s->buffer = buffer;
00040 s->buffer_size = buffer_size;
00041 s->buf_ptr = buffer;
00042 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
00043 s->opaque = opaque;
00044 s->write_packet = write_packet;
00045 s->read_packet = read_packet;
00046 s->seek = seek;
00047 s->pos = 0;
00048 s->must_flush = 0;
00049 s->eof_reached = 0;
00050 s->error = 0;
00051 s->is_streamed = 0;
00052 s->max_packet_size = 0;
00053 s->update_checksum= NULL;
00054 if(!read_packet && !write_flag){
00055 s->pos = buffer_size;
00056 s->buf_end = s->buffer + buffer_size;
00057 }
00058 s->read_pause = NULL;
00059 s->read_seek = NULL;
00060 return 0;
00061 }
00062
00063 ByteIOContext *av_alloc_put_byte(
00064 unsigned char *buffer,
00065 int buffer_size,
00066 int write_flag,
00067 void *opaque,
00068 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
00069 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
00070 offset_t (*seek)(void *opaque, offset_t offset, int whence)) {
00071 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
00072 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
00073 read_packet, write_packet, seek);
00074 return s;
00075 }
00076
00077 static void flush_buffer(ByteIOContext *s)
00078 {
00079 if (s->buf_ptr > s->buffer) {
00080 if (s->write_packet && !s->error){
00081 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
00082 if(ret < 0){
00083 s->error = ret;
00084 }
00085 }
00086 if(s->update_checksum){
00087 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
00088 s->checksum_ptr= s->buffer;
00089 }
00090 s->pos += s->buf_ptr - s->buffer;
00091 }
00092 s->buf_ptr = s->buffer;
00093 }
00094
00095 void put_byte(ByteIOContext *s, int b)
00096 {
00097 *(s->buf_ptr)++ = b;
00098 if (s->buf_ptr >= s->buf_end)
00099 flush_buffer(s);
00100 }
00101
00102 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
00103 {
00104 int len;
00105
00106 while (size > 0) {
00107 len = (s->buf_end - s->buf_ptr);
00108 if (len > size)
00109 len = size;
00110 memcpy(s->buf_ptr, buf, len);
00111 s->buf_ptr += len;
00112
00113 if (s->buf_ptr >= s->buf_end)
00114 flush_buffer(s);
00115
00116 buf += len;
00117 size -= len;
00118 }
00119 }
00120
00121 void put_flush_packet(ByteIOContext *s)
00122 {
00123 flush_buffer(s);
00124 s->must_flush = 0;
00125 }
00126
00127 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
00128 {
00129 offset_t offset1;
00130 offset_t pos;
00131
00132 if(!s)
00133 return AVERROR(EINVAL);
00134
00135 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
00136
00137 if (whence != SEEK_CUR && whence != SEEK_SET)
00138 return AVERROR(EINVAL);
00139
00140 if (whence == SEEK_CUR) {
00141 offset1 = pos + (s->buf_ptr - s->buffer);
00142 if (offset == 0)
00143 return offset1;
00144 offset += offset1;
00145 }
00146 offset1 = offset - pos;
00147 if (!s->must_flush &&
00148 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
00149
00150 s->buf_ptr = s->buffer + offset1;
00151 } else if(s->is_streamed && !s->write_flag &&
00152 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
00153 while(s->pos < offset && !s->eof_reached)
00154 fill_buffer(s);
00155 if (s->eof_reached)
00156 return AVERROR(EPIPE);
00157 s->buf_ptr = s->buf_end + offset - s->pos;
00158 } else {
00159 offset_t res = AVERROR(EPIPE);
00160
00161 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
00162 if (s->write_flag) {
00163 flush_buffer(s);
00164 s->must_flush = 1;
00165 } else
00166 #endif
00167 {
00168 s->buf_end = s->buffer;
00169 }
00170 s->buf_ptr = s->buffer;
00171 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
00172 return res;
00173 s->pos = offset;
00174 }
00175 s->eof_reached = 0;
00176 return offset;
00177 }
00178
00179 void url_fskip(ByteIOContext *s, offset_t offset)
00180 {
00181 url_fseek(s, offset, SEEK_CUR);
00182 }
00183
00184 offset_t url_ftell(ByteIOContext *s)
00185 {
00186 return url_fseek(s, 0, SEEK_CUR);
00187 }
00188
00189 offset_t url_fsize(ByteIOContext *s)
00190 {
00191 offset_t size;
00192
00193 if(!s)
00194 return AVERROR(EINVAL);
00195
00196 if (!s->seek)
00197 return AVERROR(EPIPE);
00198 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
00199 if(size<0){
00200 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
00201 return size;
00202 size++;
00203 s->seek(s->opaque, s->pos, SEEK_SET);
00204 }
00205 return size;
00206 }
00207
00208 int url_feof(ByteIOContext *s)
00209 {
00210 if(!s)
00211 return 0;
00212 return s->eof_reached;
00213 }
00214
00215 int url_ferror(ByteIOContext *s)
00216 {
00217 if(!s)
00218 return 0;
00219 return s->error;
00220 }
00221
00222 void put_le32(ByteIOContext *s, unsigned int val)
00223 {
00224 put_byte(s, val);
00225 put_byte(s, val >> 8);
00226 put_byte(s, val >> 16);
00227 put_byte(s, val >> 24);
00228 }
00229
00230 void put_be32(ByteIOContext *s, unsigned int val)
00231 {
00232 put_byte(s, val >> 24);
00233 put_byte(s, val >> 16);
00234 put_byte(s, val >> 8);
00235 put_byte(s, val);
00236 }
00237
00238 void put_strz(ByteIOContext *s, const char *str)
00239 {
00240 if (str)
00241 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
00242 else
00243 put_byte(s, 0);
00244 }
00245
00246 void put_le64(ByteIOContext *s, uint64_t val)
00247 {
00248 put_le32(s, (uint32_t)(val & 0xffffffff));
00249 put_le32(s, (uint32_t)(val >> 32));
00250 }
00251
00252 void put_be64(ByteIOContext *s, uint64_t val)
00253 {
00254 put_be32(s, (uint32_t)(val >> 32));
00255 put_be32(s, (uint32_t)(val & 0xffffffff));
00256 }
00257
00258 void put_le16(ByteIOContext *s, unsigned int val)
00259 {
00260 put_byte(s, val);
00261 put_byte(s, val >> 8);
00262 }
00263
00264 void put_be16(ByteIOContext *s, unsigned int val)
00265 {
00266 put_byte(s, val >> 8);
00267 put_byte(s, val);
00268 }
00269
00270 void put_le24(ByteIOContext *s, unsigned int val)
00271 {
00272 put_le16(s, val & 0xffff);
00273 put_byte(s, val >> 16);
00274 }
00275
00276 void put_be24(ByteIOContext *s, unsigned int val)
00277 {
00278 put_be16(s, val >> 8);
00279 put_byte(s, val);
00280 }
00281
00282 void put_tag(ByteIOContext *s, const char *tag)
00283 {
00284 while (*tag) {
00285 put_byte(s, *tag++);
00286 }
00287 }
00288
00289
00290
00291 static void fill_buffer(ByteIOContext *s)
00292 {
00293 int len=0;
00294
00295
00296 if (s->eof_reached)
00297 return;
00298
00299 if(s->update_checksum){
00300 if(s->buf_end > s->checksum_ptr)
00301 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
00302 s->checksum_ptr= s->buffer;
00303 }
00304
00305 if(s->read_packet)
00306 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
00307 if (len <= 0) {
00308
00309
00310 s->eof_reached = 1;
00311 if(len<0)
00312 s->error= len;
00313 } else {
00314 s->pos += len;
00315 s->buf_ptr = s->buffer;
00316 s->buf_end = s->buffer + len;
00317 }
00318 }
00319
00320 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
00321 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
00322 }
00323
00324 unsigned long get_checksum(ByteIOContext *s){
00325 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
00326 s->update_checksum= NULL;
00327 return s->checksum;
00328 }
00329
00330 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
00331 s->update_checksum= update_checksum;
00332 if(s->update_checksum){
00333 s->checksum= checksum;
00334 s->checksum_ptr= s->buf_ptr;
00335 }
00336 }
00337
00338
00339 int get_byte(ByteIOContext *s)
00340 {
00341 if (s->buf_ptr < s->buf_end) {
00342 return *s->buf_ptr++;
00343 } else {
00344 fill_buffer(s);
00345 if (s->buf_ptr < s->buf_end)
00346 return *s->buf_ptr++;
00347 else
00348 return 0;
00349 }
00350 }
00351
00352 int url_fgetc(ByteIOContext *s)
00353 {
00354 if (s->buf_ptr < s->buf_end) {
00355 return *s->buf_ptr++;
00356 } else {
00357 fill_buffer(s);
00358 if (s->buf_ptr < s->buf_end)
00359 return *s->buf_ptr++;
00360 else
00361 return URL_EOF;
00362 }
00363 }
00364
00365 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
00366 {
00367 int len, size1;
00368
00369 size1 = size;
00370 while (size > 0) {
00371 len = s->buf_end - s->buf_ptr;
00372 if (len > size)
00373 len = size;
00374 if (len == 0) {
00375 if(size > s->buffer_size && !s->update_checksum){
00376 if(s->read_packet)
00377 len = s->read_packet(s->opaque, buf, size);
00378 if (len <= 0) {
00379
00380
00381 s->eof_reached = 1;
00382 if(len<0)
00383 s->error= len;
00384 break;
00385 } else {
00386 s->pos += len;
00387 size -= len;
00388 buf += len;
00389 s->buf_ptr = s->buffer;
00390 s->buf_end = s->buffer;
00391 }
00392 }else{
00393 fill_buffer(s);
00394 len = s->buf_end - s->buf_ptr;
00395 if (len == 0)
00396 break;
00397 }
00398 } else {
00399 memcpy(buf, s->buf_ptr, len);
00400 buf += len;
00401 s->buf_ptr += len;
00402 size -= len;
00403 }
00404 }
00405 return size1 - size;
00406 }
00407
00408 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
00409 {
00410 int len;
00411
00412 if(size<0)
00413 return -1;
00414
00415 len = s->buf_end - s->buf_ptr;
00416 if (len == 0) {
00417 fill_buffer(s);
00418 len = s->buf_end - s->buf_ptr;
00419 }
00420 if (len > size)
00421 len = size;
00422 memcpy(buf, s->buf_ptr, len);
00423 s->buf_ptr += len;
00424 return len;
00425 }
00426
00427 unsigned int get_le16(ByteIOContext *s)
00428 {
00429 unsigned int val;
00430 val = get_byte(s);
00431 val |= get_byte(s) << 8;
00432 return val;
00433 }
00434
00435 unsigned int get_le24(ByteIOContext *s)
00436 {
00437 unsigned int val;
00438 val = get_le16(s);
00439 val |= get_byte(s) << 16;
00440 return val;
00441 }
00442
00443 unsigned int get_le32(ByteIOContext *s)
00444 {
00445 unsigned int val;
00446 val = get_le16(s);
00447 val |= get_le16(s) << 16;
00448 return val;
00449 }
00450
00451 uint64_t get_le64(ByteIOContext *s)
00452 {
00453 uint64_t val;
00454 val = (uint64_t)get_le32(s);
00455 val |= (uint64_t)get_le32(s) << 32;
00456 return val;
00457 }
00458
00459 unsigned int get_be16(ByteIOContext *s)
00460 {
00461 unsigned int val;
00462 val = get_byte(s) << 8;
00463 val |= get_byte(s);
00464 return val;
00465 }
00466
00467 unsigned int get_be24(ByteIOContext *s)
00468 {
00469 unsigned int val;
00470 val = get_be16(s) << 8;
00471 val |= get_byte(s);
00472 return val;
00473 }
00474 unsigned int get_be32(ByteIOContext *s)
00475 {
00476 unsigned int val;
00477 val = get_be16(s) << 16;
00478 val |= get_be16(s);
00479 return val;
00480 }
00481
00482 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
00483 {
00484 int i = 0;
00485 char c;
00486
00487 while ((c = get_byte(s))) {
00488 if (i < maxlen-1)
00489 buf[i++] = c;
00490 }
00491
00492 buf[i] = 0;
00493
00494 return buf;
00495 }
00496
00497 uint64_t get_be64(ByteIOContext *s)
00498 {
00499 uint64_t val;
00500 val = (uint64_t)get_be32(s) << 32;
00501 val |= (uint64_t)get_be32(s);
00502 return val;
00503 }
00504
00505 uint64_t ff_get_v(ByteIOContext *bc){
00506 uint64_t val = 0;
00507 int tmp;
00508
00509 do{
00510 tmp = get_byte(bc);
00511 val= (val<<7) + (tmp&127);
00512 }while(tmp&128);
00513 return val;
00514 }
00515
00516 int url_fdopen(ByteIOContext **s, URLContext *h)
00517 {
00518 uint8_t *buffer;
00519 int buffer_size, max_packet_size;
00520
00521
00522 max_packet_size = url_get_max_packet_size(h);
00523 if (max_packet_size) {
00524 buffer_size = max_packet_size;
00525 } else {
00526 buffer_size = IO_BUFFER_SIZE;
00527 }
00528 buffer = av_malloc(buffer_size);
00529 if (!buffer)
00530 return AVERROR(ENOMEM);
00531
00532 *s = av_mallocz(sizeof(ByteIOContext));
00533 if(!*s) {
00534 av_free(buffer);
00535 return AVERROR(ENOMEM);
00536 }
00537
00538 if (init_put_byte(*s, buffer, buffer_size,
00539 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
00540 url_read, url_write, url_seek) < 0) {
00541 av_free(buffer);
00542 av_freep(s);
00543 return AVERROR(EIO);
00544 }
00545 (*s)->is_streamed = h->is_streamed;
00546 (*s)->max_packet_size = max_packet_size;
00547 if(h->prot) {
00548 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
00549 (*s)->read_seek = (offset_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
00550 }
00551 return 0;
00552 }
00553
00554 int url_setbufsize(ByteIOContext *s, int buf_size)
00555 {
00556 uint8_t *buffer;
00557 buffer = av_malloc(buf_size);
00558 if (!buffer)
00559 return AVERROR(ENOMEM);
00560
00561 av_free(s->buffer);
00562 s->buffer = buffer;
00563 s->buffer_size = buf_size;
00564 s->buf_ptr = buffer;
00565 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
00566 return 0;
00567 }
00568
00569 int url_resetbuf(ByteIOContext *s, int flags)
00570 {
00571 URLContext *h = s->opaque;
00572 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
00573 return AVERROR(EINVAL);
00574
00575 if (flags & URL_WRONLY) {
00576 s->buf_end = s->buffer + s->buffer_size;
00577 s->write_flag = 1;
00578 } else {
00579 s->buf_end = s->buffer;
00580 s->write_flag = 0;
00581 }
00582 return 0;
00583 }
00584
00585 int url_fopen(ByteIOContext **s, const char *filename, int flags)
00586 {
00587 URLContext *h;
00588 int err;
00589
00590 err = url_open(&h, filename, flags);
00591 if (err < 0)
00592 return err;
00593 err = url_fdopen(s, h);
00594 if (err < 0) {
00595 url_close(h);
00596 return err;
00597 }
00598 return 0;
00599 }
00600
00601 int url_fclose(ByteIOContext *s)
00602 {
00603 URLContext *h = s->opaque;
00604
00605 av_free(s->buffer);
00606 av_free(s);
00607 return url_close(h);
00608 }
00609
00610 URLContext *url_fileno(ByteIOContext *s)
00611 {
00612 return s->opaque;
00613 }
00614
00615 #ifdef CONFIG_MUXERS
00616 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
00617 {
00618 va_list ap;
00619 char buf[4096];
00620 int ret;
00621
00622 va_start(ap, fmt);
00623 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
00624 va_end(ap);
00625 put_buffer(s, buf, strlen(buf));
00626 return ret;
00627 }
00628 #endif //CONFIG_MUXERS
00629
00630 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
00631 {
00632 int c;
00633 char *q;
00634
00635 c = url_fgetc(s);
00636 if (c == EOF)
00637 return NULL;
00638 q = buf;
00639 for(;;) {
00640 if (c == EOF || c == '\n')
00641 break;
00642 if ((q - buf) < buf_size - 1)
00643 *q++ = c;
00644 c = url_fgetc(s);
00645 }
00646 if (buf_size > 0)
00647 *q = '\0';
00648 return buf;
00649 }
00650
00651 int url_fget_max_packet_size(ByteIOContext *s)
00652 {
00653 return s->max_packet_size;
00654 }
00655
00656 int av_url_read_fpause(ByteIOContext *s, int pause)
00657 {
00658 if (!s->read_pause)
00659 return AVERROR(ENOSYS);
00660 return s->read_pause(s->opaque, pause);
00661 }
00662
00663 offset_t av_url_read_fseek(ByteIOContext *s,
00664 int stream_index, int64_t timestamp, int flags)
00665 {
00666 URLContext *h = s->opaque;
00667 offset_t ret;
00668 if (!s->read_seek)
00669 return AVERROR(ENOSYS);
00670 ret = s->read_seek(h, stream_index, timestamp, flags);
00671 if(ret >= 0) {
00672 s->buf_ptr = s->buf_end;
00673 s->pos = s->seek(h, 0, SEEK_CUR);
00674 }
00675 return ret;
00676 }
00677
00678
00679
00680 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
00681
00682 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
00683 {
00684 int ret;
00685 *s = av_mallocz(sizeof(ByteIOContext));
00686 if(!*s)
00687 return AVERROR(ENOMEM);
00688 ret = init_put_byte(*s, buf, buf_size,
00689 (flags & URL_WRONLY || flags & URL_RDWR),
00690 NULL, NULL, NULL, NULL);
00691 if(ret != 0)
00692 av_freep(s);
00693 return ret;
00694 }
00695
00696 int url_close_buf(ByteIOContext *s)
00697 {
00698 put_flush_packet(s);
00699 return s->buf_ptr - s->buffer;
00700 }
00701
00702
00703
00704 typedef struct DynBuffer {
00705 int pos, size, allocated_size;
00706 uint8_t *buffer;
00707 int io_buffer_size;
00708 uint8_t io_buffer[1];
00709 } DynBuffer;
00710
00711 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
00712 {
00713 DynBuffer *d = opaque;
00714 int new_size, new_allocated_size;
00715
00716
00717 new_size = d->pos + buf_size;
00718 new_allocated_size = d->allocated_size;
00719 if(new_size < d->pos || new_size > INT_MAX/2)
00720 return -1;
00721 while (new_size > new_allocated_size) {
00722 if (!new_allocated_size)
00723 new_allocated_size = new_size;
00724 else
00725 new_allocated_size += new_allocated_size / 2 + 1;
00726 }
00727
00728 if (new_allocated_size > d->allocated_size) {
00729 d->buffer = av_realloc(d->buffer, new_allocated_size);
00730 if(d->buffer == NULL)
00731 return -1234;
00732 d->allocated_size = new_allocated_size;
00733 }
00734 memcpy(d->buffer + d->pos, buf, buf_size);
00735 d->pos = new_size;
00736 if (d->pos > d->size)
00737 d->size = d->pos;
00738 return buf_size;
00739 }
00740
00741 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
00742 {
00743 unsigned char buf1[4];
00744 int ret;
00745
00746
00747 buf1[0] = (buf_size >> 24);
00748 buf1[1] = (buf_size >> 16);
00749 buf1[2] = (buf_size >> 8);
00750 buf1[3] = (buf_size);
00751 ret= dyn_buf_write(opaque, buf1, 4);
00752 if(ret < 0)
00753 return ret;
00754
00755
00756 return dyn_buf_write(opaque, buf, buf_size);
00757 }
00758
00759 static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
00760 {
00761 DynBuffer *d = opaque;
00762
00763 if (whence == SEEK_CUR)
00764 offset += d->pos;
00765 else if (whence == SEEK_END)
00766 offset += d->size;
00767 if (offset < 0 || offset > 0x7fffffffLL)
00768 return -1;
00769 d->pos = offset;
00770 return 0;
00771 }
00772
00773 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
00774 {
00775 DynBuffer *d;
00776 int io_buffer_size, ret;
00777
00778 if (max_packet_size)
00779 io_buffer_size = max_packet_size;
00780 else
00781 io_buffer_size = 1024;
00782
00783 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
00784 return -1;
00785 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
00786 if (!d)
00787 return -1;
00788 *s = av_mallocz(sizeof(ByteIOContext));
00789 if(!*s) {
00790 av_free(d);
00791 return AVERROR(ENOMEM);
00792 }
00793 d->io_buffer_size = io_buffer_size;
00794 d->buffer = NULL;
00795 d->pos = 0;
00796 d->size = 0;
00797 d->allocated_size = 0;
00798 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
00799 1, d, NULL,
00800 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
00801 max_packet_size ? NULL : dyn_buf_seek);
00802 if (ret == 0) {
00803 (*s)->max_packet_size = max_packet_size;
00804 } else {
00805 av_free(d);
00806 av_freep(s);
00807 }
00808 return ret;
00809 }
00810
00811 int url_open_dyn_buf(ByteIOContext **s)
00812 {
00813 return url_open_dyn_buf_internal(s, 0);
00814 }
00815
00816 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
00817 {
00818 if (max_packet_size <= 0)
00819 return -1;
00820 return url_open_dyn_buf_internal(s, max_packet_size);
00821 }
00822
00823 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
00824 {
00825 DynBuffer *d = s->opaque;
00826 int size;
00827
00828 put_flush_packet(s);
00829
00830 *pbuffer = d->buffer;
00831 size = d->size;
00832 av_free(d);
00833 av_free(s);
00834 return size;
00835 }
00836 #endif