3 * Copyright (c) 2000,2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
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"
31 #include "avio_internal.h"
36 #define IO_BUFFER_SIZE 32768
39 * Do seeks within this distance ahead of the current buffer by skipping
40 * data instead of calling the protocol seek function, for seekable
43 #define SHORT_SEEK_THRESHOLD 4096
45 static void *ff_avio_child_next(void *obj, void *prev)
48 return prev ? NULL : s->opaque;
51 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
53 return prev ? NULL : &ffurl_context_class;
56 #define OFFSET(x) offsetof(AVIOContext,x)
57 #define E AV_OPT_FLAG_ENCODING_PARAM
58 #define D AV_OPT_FLAG_DECODING_PARAM
59 static const AVOption ff_avio_options[] = {
60 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
64 const AVClass ff_avio_class = {
65 .class_name = "AVIOContext",
66 .item_name = av_default_item_name,
67 .version = LIBAVUTIL_VERSION_INT,
68 .option = ff_avio_options,
69 .child_next = ff_avio_child_next,
70 .child_class_next = ff_avio_child_class_next,
73 static void fill_buffer(AVIOContext *s);
74 static int url_resetbuf(AVIOContext *s, int flags);
76 int ffio_init_context(AVIOContext *s,
77 unsigned char *buffer,
81 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
82 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
83 int64_t (*seek)(void *opaque, int64_t offset, int whence))
87 s->buffer_size = buffer_size;
92 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
94 s->write_packet = write_packet;
95 s->read_packet = read_packet;
101 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
102 s->max_packet_size = 0;
103 s->update_checksum = NULL;
104 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
106 if (!read_packet && !write_flag) {
107 s->pos = buffer_size;
108 s->buf_end = s->buffer + buffer_size;
110 s->read_pause = NULL;
116 AVIOContext *avio_alloc_context(
117 unsigned char *buffer,
121 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
122 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
123 int64_t (*seek)(void *opaque, int64_t offset, int whence))
125 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
128 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
129 read_packet, write_packet, seek);
133 static void writeout(AVIOContext *s, const uint8_t *data, int len)
135 if (s->write_packet && !s->error) {
136 int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
141 s->writeout_count ++;
145 static void flush_buffer(AVIOContext *s)
147 if (s->write_flag && s->buf_ptr > s->buffer) {
148 writeout(s, s->buffer, s->buf_ptr - s->buffer);
149 if (s->update_checksum) {
150 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
151 s->buf_ptr - s->checksum_ptr);
152 s->checksum_ptr = s->buffer;
155 s->buf_ptr = s->buffer;
157 s->buf_end = s->buffer;
160 void avio_w8(AVIOContext *s, int b)
162 av_assert2(b>=-128 && b<=255);
164 if (s->buf_ptr >= s->buf_end)
168 void ffio_fill(AVIOContext *s, int b, int count)
171 int len = FFMIN(s->buf_end - s->buf_ptr, count);
172 memset(s->buf_ptr, b, len);
175 if (s->buf_ptr >= s->buf_end)
182 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
184 if (s->direct && !s->update_checksum) {
186 writeout(s, buf, size);
190 int len = FFMIN(s->buf_end - s->buf_ptr, size);
191 memcpy(s->buf_ptr, buf, len);
194 if (s->buf_ptr >= s->buf_end)
202 void avio_flush(AVIOContext *s)
208 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
212 int force = whence & AVSEEK_FORCE;
214 whence &= ~AVSEEK_FORCE;
217 return AVERROR(EINVAL);
219 buffer_size = s->buf_end - s->buffer;
220 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
221 pos = s->pos - (s->write_flag ? 0 : buffer_size);
223 if (whence != SEEK_CUR && whence != SEEK_SET)
224 return AVERROR(EINVAL);
226 if (whence == SEEK_CUR) {
227 offset1 = pos + (s->buf_ptr - s->buffer);
233 return AVERROR(EINVAL);
235 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
236 if (!s->must_flush && (!s->direct || !s->seek) &&
237 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
238 /* can do the seek inside the buffer */
239 s->buf_ptr = s->buffer + offset1;
240 } else if ((!s->seekable ||
241 offset1 <= buffer_size + s->short_seek_threshold) &&
242 !s->write_flag && offset1 >= 0 &&
243 (!s->direct || !s->seek) &&
244 (whence != SEEK_END || force)) {
245 while(s->pos < offset && !s->eof_reached)
249 s->buf_ptr = s->buf_end - (s->pos - offset);
250 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
253 pos -= FFMIN(buffer_size>>1, pos);
254 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
257 s->buf_ptr = s->buffer;
261 return avio_seek(s, offset, SEEK_SET | force);
269 return AVERROR(EPIPE);
270 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
274 s->buf_end = s->buffer;
275 s->buf_ptr = s->buffer;
282 int64_t avio_skip(AVIOContext *s, int64_t offset)
284 return avio_seek(s, offset, SEEK_CUR);
287 int64_t avio_size(AVIOContext *s)
292 return AVERROR(EINVAL);
295 return AVERROR(ENOSYS);
296 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
298 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
301 s->seek(s->opaque, s->pos, SEEK_SET);
306 int avio_feof(AVIOContext *s)
314 return s->eof_reached;
318 int url_feof(AVIOContext *s)
324 void avio_wl32(AVIOContext *s, unsigned int val)
326 avio_w8(s, (uint8_t) val );
327 avio_w8(s, (uint8_t)(val >> 8 ));
328 avio_w8(s, (uint8_t)(val >> 16));
329 avio_w8(s, val >> 24 );
332 void avio_wb32(AVIOContext *s, unsigned int val)
334 avio_w8(s, val >> 24 );
335 avio_w8(s, (uint8_t)(val >> 16));
336 avio_w8(s, (uint8_t)(val >> 8 ));
337 avio_w8(s, (uint8_t) val );
340 int avio_put_str(AVIOContext *s, const char *str)
345 avio_write(s, (const unsigned char *) str, len);
351 static inline int put_str16(AVIOContext *s, const char *str, const int be)
353 const uint8_t *q = str;
361 GET_UTF8(ch, *q++, goto invalid;)
362 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
366 av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
367 err = AVERROR(EINVAL);
381 #define PUT_STR16(type, big_endian) \
382 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
384 return put_str16(s, str, big_endian); \
392 int ff_get_v_length(uint64_t val)
402 void ff_put_v(AVIOContext *bc, uint64_t val)
404 int i = ff_get_v_length(val);
407 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
409 avio_w8(bc, val & 127);
412 void avio_wl64(AVIOContext *s, uint64_t val)
414 avio_wl32(s, (uint32_t)(val & 0xffffffff));
415 avio_wl32(s, (uint32_t)(val >> 32));
418 void avio_wb64(AVIOContext *s, uint64_t val)
420 avio_wb32(s, (uint32_t)(val >> 32));
421 avio_wb32(s, (uint32_t)(val & 0xffffffff));
424 void avio_wl16(AVIOContext *s, unsigned int val)
426 avio_w8(s, (uint8_t)val);
427 avio_w8(s, (int)val >> 8);
430 void avio_wb16(AVIOContext *s, unsigned int val)
432 avio_w8(s, (int)val >> 8);
433 avio_w8(s, (uint8_t)val);
436 void avio_wl24(AVIOContext *s, unsigned int val)
438 avio_wl16(s, val & 0xffff);
439 avio_w8(s, (int)val >> 16);
442 void avio_wb24(AVIOContext *s, unsigned int val)
444 avio_wb16(s, (int)val >> 8);
445 avio_w8(s, (uint8_t)val);
450 static void fill_buffer(AVIOContext *s)
452 int max_buffer_size = s->max_packet_size ?
453 s->max_packet_size : IO_BUFFER_SIZE;
454 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
455 s->buf_end : s->buffer;
456 int len = s->buffer_size - (dst - s->buffer);
458 /* can't fill the buffer without read_packet, just set EOF if appropriate */
459 if (!s->read_packet && s->buf_ptr >= s->buf_end)
462 /* no need to do anything if EOF already reached */
466 if (s->update_checksum && dst == s->buffer) {
467 if (s->buf_end > s->checksum_ptr)
468 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
469 s->buf_end - s->checksum_ptr);
470 s->checksum_ptr = s->buffer;
473 /* make buffer smaller in case it ended up large after probing */
474 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
475 if (dst == s->buffer) {
476 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
478 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
480 s->checksum_ptr = dst = s->buffer;
482 av_assert0(len >= s->orig_buffer_size);
483 len = s->orig_buffer_size;
487 len = s->read_packet(s->opaque, dst, len);
491 /* do not modify buffer if EOF reached so that a seek back can
492 be done without rereading data */
499 s->buf_end = dst + len;
500 s->bytes_read += len;
504 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
507 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
510 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
513 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
516 unsigned long ffio_get_checksum(AVIOContext *s)
518 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
519 s->buf_ptr - s->checksum_ptr);
520 s->update_checksum = NULL;
524 void ffio_init_checksum(AVIOContext *s,
525 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
526 unsigned long checksum)
528 s->update_checksum = update_checksum;
529 if (s->update_checksum) {
530 s->checksum = checksum;
531 s->checksum_ptr = s->buf_ptr;
535 /* XXX: put an inline version */
536 int avio_r8(AVIOContext *s)
538 if (s->buf_ptr >= s->buf_end)
540 if (s->buf_ptr < s->buf_end)
541 return *s->buf_ptr++;
545 int avio_read(AVIOContext *s, unsigned char *buf, int size)
551 len = FFMIN(s->buf_end - s->buf_ptr, size);
552 if (len == 0 || s->write_flag) {
553 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
554 // bypass the buffer and read data directly into buf
556 len = s->read_packet(s->opaque, buf, size);
559 /* do not modify buffer if EOF reached so that a seek back can
560 be done without rereading data */
567 s->bytes_read += len;
571 s->buf_ptr = s->buffer;
572 s->buf_end = s->buffer/* + len*/;
576 len = s->buf_end - s->buf_ptr;
581 memcpy(buf, s->buf_ptr, len);
588 if (s->error) return s->error;
589 if (avio_feof(s)) return AVERROR_EOF;
594 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
596 int ret = avio_read(s, buf, size);
598 return AVERROR_INVALIDDATA;
602 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
604 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
610 return avio_read(s, buf, size);
614 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
621 if (s->read_packet && s->write_flag) {
622 len = s->read_packet(s->opaque, buf, size);
628 len = s->buf_end - s->buf_ptr;
630 /* Reset the buf_end pointer to the start of the buffer, to make sure
631 * the fill_buffer call tries to read as much data as fits into the
632 * full buffer, instead of just what space is left after buf_end.
633 * This avoids returning partial packets at the end of the buffer,
634 * for packet based inputs.
636 s->buf_end = s->buf_ptr = s->buffer;
638 len = s->buf_end - s->buf_ptr;
642 memcpy(buf, s->buf_ptr, len);
645 if (s->error) return s->error;
646 if (avio_feof(s)) return AVERROR_EOF;
651 unsigned int avio_rl16(AVIOContext *s)
655 val |= avio_r8(s) << 8;
659 unsigned int avio_rl24(AVIOContext *s)
663 val |= avio_r8(s) << 16;
667 unsigned int avio_rl32(AVIOContext *s)
671 val |= avio_rl16(s) << 16;
675 uint64_t avio_rl64(AVIOContext *s)
678 val = (uint64_t)avio_rl32(s);
679 val |= (uint64_t)avio_rl32(s) << 32;
683 unsigned int avio_rb16(AVIOContext *s)
686 val = avio_r8(s) << 8;
691 unsigned int avio_rb24(AVIOContext *s)
694 val = avio_rb16(s) << 8;
698 unsigned int avio_rb32(AVIOContext *s)
701 val = avio_rb16(s) << 16;
706 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
713 if (c && i < maxlen-1)
715 } while (c != '\n' && c != '\r' && c);
716 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
723 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
728 return AVERROR(EINVAL);
729 // reserve 1 byte for terminating 0
730 buflen = FFMIN(buflen - 1, maxlen);
731 for (i = 0; i < buflen; i++)
732 if (!(buf[i] = avio_r8(s)))
735 for (; i < maxlen; i++)
741 #define GET_STR16(type, read) \
742 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
747 return AVERROR(EINVAL); \
748 while (ret + 1 < maxlen) {\
751 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
754 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
760 GET_STR16(le, avio_rl16)
761 GET_STR16(be, avio_rb16)
765 uint64_t avio_rb64(AVIOContext *s)
768 val = (uint64_t)avio_rb32(s) << 32;
769 val |= (uint64_t)avio_rb32(s);
773 uint64_t ffio_read_varlen(AVIOContext *bc){
779 val= (val<<7) + (tmp&127);
784 int ffio_fdopen(AVIOContext **s, URLContext *h)
787 int buffer_size, max_packet_size;
789 max_packet_size = h->max_packet_size;
790 if (max_packet_size) {
791 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
793 buffer_size = IO_BUFFER_SIZE;
795 buffer = av_malloc(buffer_size);
797 return AVERROR(ENOMEM);
799 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
800 (int (*)(void *, uint8_t *, int)) ffurl_read,
801 (int (*)(void *, uint8_t *, int)) ffurl_write,
802 (int64_t (*)(void *, int64_t, int)) ffurl_seek);
805 return AVERROR(ENOMEM);
807 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
808 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
810 return AVERROR(ENOMEM);
812 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
813 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
814 (*s)->max_packet_size = max_packet_size;
816 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
817 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
819 (*s)->av_class = &ff_avio_class;
823 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
826 int max_buffer_size = s->max_packet_size ?
827 s->max_packet_size : IO_BUFFER_SIZE;
828 int filled = s->buf_end - s->buffer;
829 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
831 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
833 if (buf_size < filled || s->seekable || !s->read_packet)
835 av_assert0(!s->write_flag);
837 buffer = av_malloc(buf_size);
839 return AVERROR(ENOMEM);
841 memcpy(buffer, s->buffer, filled);
843 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
844 s->buf_end = buffer + (s->buf_end - s->buffer);
846 s->buffer_size = buf_size;
847 if (checksum_ptr_offset >= 0)
848 s->checksum_ptr = s->buffer + checksum_ptr_offset;
852 int ffio_set_buf_size(AVIOContext *s, int buf_size)
855 buffer = av_malloc(buf_size);
857 return AVERROR(ENOMEM);
861 s->orig_buffer_size =
862 s->buffer_size = buf_size;
864 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
868 static int url_resetbuf(AVIOContext *s, int flags)
870 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
872 if (flags & AVIO_FLAG_WRITE) {
873 s->buf_end = s->buffer + s->buffer_size;
876 s->buf_end = s->buffer;
882 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
884 int64_t buffer_start;
886 int overlap, new_size, alloc_size;
887 uint8_t *buf = *bufp;
891 return AVERROR(EINVAL);
894 buffer_size = s->buf_end - s->buffer;
896 /* the buffers must touch or overlap */
897 if ((buffer_start = s->pos - buffer_size) > buf_size) {
899 return AVERROR(EINVAL);
902 overlap = buf_size - buffer_start;
903 new_size = buf_size + buffer_size - overlap;
905 alloc_size = FFMAX(s->buffer_size, new_size);
906 if (alloc_size > buf_size)
907 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
908 return AVERROR(ENOMEM);
910 if (new_size > buf_size) {
911 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
916 s->buf_ptr = s->buffer = buf;
917 s->buffer_size = alloc_size;
919 s->buf_end = s->buf_ptr + buf_size;
926 int avio_open(AVIOContext **s, const char *filename, int flags)
928 return avio_open2(s, filename, flags, NULL, NULL);
931 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
932 const AVIOInterruptCB *int_cb, AVDictionary **options,
933 const char *whitelist
939 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist);
942 err = ffio_fdopen(s, h);
950 int avio_open2(AVIOContext **s, const char *filename, int flags,
951 const AVIOInterruptCB *int_cb, AVDictionary **options)
953 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL);
956 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
957 const AVIOInterruptCB *int_cb, AVDictionary **options)
959 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist);
962 int avio_close(AVIOContext *s)
971 av_freep(&s->buffer);
973 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
975 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
978 return ffurl_close(h);
981 int avio_closep(AVIOContext **s)
983 int ret = avio_close(*s);
988 int avio_printf(AVIOContext *s, const char *fmt, ...)
991 char buf[4096]; /* update doc entry in avio.h if changed */
995 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
997 avio_write(s, buf, strlen(buf));
1001 int avio_pause(AVIOContext *s, int pause)
1004 return AVERROR(ENOSYS);
1005 return s->read_pause(s->opaque, pause);
1008 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1009 int64_t timestamp, int flags)
1011 URLContext *h = s->opaque;
1014 return AVERROR(ENOSYS);
1015 ret = s->read_seek(h, stream_index, timestamp, flags);
1018 s->buf_ptr = s->buf_end; // Flush buffer
1019 pos = s->seek(h, 0, SEEK_CUR);
1022 else if (pos != AVERROR(ENOSYS))
1028 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1033 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1034 if (ret == AVERROR_EOF)
1038 av_bprint_append_data(pb, buf, ret);
1039 if (!av_bprint_is_complete(pb))
1040 return AVERROR(ENOMEM);
1046 int avio_accept(AVIOContext *s, AVIOContext **c)
1049 URLContext *sc = s->opaque;
1050 URLContext *cc = NULL;
1051 ret = ffurl_accept(sc, &cc);
1054 return ffio_fdopen(c, cc);
1057 int avio_handshake(AVIOContext *c)
1059 URLContext *cc = c->opaque;
1060 return ffurl_handshake(cc);
1063 /* output in a dynamic buffer */
1065 typedef struct DynBuffer {
1066 int pos, size, allocated_size;
1069 uint8_t io_buffer[1];
1072 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1074 DynBuffer *d = opaque;
1075 unsigned new_size, new_allocated_size;
1077 /* reallocate buffer if needed */
1078 new_size = d->pos + buf_size;
1079 new_allocated_size = d->allocated_size;
1080 if (new_size < d->pos || new_size > INT_MAX/2)
1082 while (new_size > new_allocated_size) {
1083 if (!new_allocated_size)
1084 new_allocated_size = new_size;
1086 new_allocated_size += new_allocated_size / 2 + 1;
1089 if (new_allocated_size > d->allocated_size) {
1091 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1092 d->allocated_size = 0;
1096 d->allocated_size = new_allocated_size;
1098 memcpy(d->buffer + d->pos, buf, buf_size);
1100 if (d->pos > d->size)
1105 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1107 unsigned char buf1[4];
1110 /* packetized write: output the header */
1111 AV_WB32(buf1, buf_size);
1112 ret = dyn_buf_write(opaque, buf1, 4);
1117 return dyn_buf_write(opaque, buf, buf_size);
1120 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1122 DynBuffer *d = opaque;
1124 if (whence == SEEK_CUR)
1126 else if (whence == SEEK_END)
1128 if (offset < 0 || offset > 0x7fffffffLL)
1134 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1137 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1139 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1141 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1143 return AVERROR(ENOMEM);
1144 d->io_buffer_size = io_buffer_size;
1145 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1146 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1147 max_packet_size ? NULL : dyn_buf_seek);
1150 return AVERROR(ENOMEM);
1152 (*s)->max_packet_size = max_packet_size;
1156 int avio_open_dyn_buf(AVIOContext **s)
1158 return url_open_dyn_buf_internal(s, 0);
1161 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1163 if (max_packet_size <= 0)
1165 return url_open_dyn_buf_internal(s, max_packet_size);
1168 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1172 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1180 /* don't attempt to pad fixed-size packet buffers */
1181 if (!s->max_packet_size) {
1182 avio_write(s, padbuf, sizeof(padbuf));
1183 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1189 *pbuffer = d->buffer;
1193 return size - padding;
1196 void ffio_free_dyn_buf(AVIOContext **s)
1201 avio_close_dyn_buf(*s, &tmp);
1206 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1208 DynBuffer *d = opaque;
1211 if (d->pos > d->size)
1216 int ffio_open_null_buf(AVIOContext **s)
1218 int ret = url_open_dyn_buf_internal(s, 0);
1220 AVIOContext *pb = *s;
1221 pb->write_packet = null_buf_write;
1226 int ffio_close_null_buf(AVIOContext *s)
1228 DynBuffer *d = s->opaque;