36 #define IO_BUFFER_SIZE 32768
43 #define SHORT_SEEK_THRESHOLD 4096
48 return prev ? NULL : s->
opaque;
79 int64_t (*seek)(
void *opaque, int64_t
offset,
int whence))
102 s->
pos = buffer_size;
112 unsigned char *buffer,
118 int64_t (*seek)(
void *opaque, int64_t
offset,
int whence))
209 whence &= ~AVSEEK_FORCE;
217 if (whence != SEEK_CUR && whence != SEEK_SET)
220 if (whence == SEEK_CUR) {
226 offset1 = offset - pos;
228 offset1 >= 0 && offset1 <= buffer_size) {
235 (whence != SEEK_END || force)) {
241 }
else if(!s->
write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->
seek && offset > 0) {
244 pos -=
FFMIN(buffer_size>>1, pos);
245 if ((res = s->
seek(s->
opaque, pos, SEEK_SET)) < 0)
252 return avio_seek(s, offset, SEEK_SET | force);
261 if ((res = s->
seek(s->
opaque, offset, SEEK_SET)) < 0)
289 if ((size = s->
seek(s->
opaque, -1, SEEK_END)) < 0)
336 avio_write(s, (
const unsigned char *) str, len);
388 avio_wl32(s, (uint32_t)(val & 0xffffffff));
395 avio_wb32(s, (uint32_t)(val & 0xffffffff));
497 unsigned long (*update_checksum)(
unsigned long c,
const uint8_t *p,
unsigned int len),
498 unsigned long checksum)
676 if (c && i < maxlen-1)
678 }
while (c !=
'\n' && c !=
'\r' && c);
693 buflen =
FFMIN(buflen - 1, maxlen);
694 for (i = 0; i < buflen; i++)
698 for (; i < maxlen; i++)
704 #define GET_STR16(type, read) \
705 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
710 return AVERROR(EINVAL); \
711 while (ret + 1 < maxlen) {\
714 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
717 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
742 val= (val<<7) + (tmp&127);
750 int buffer_size, max_packet_size;
753 if (max_packet_size) {
754 buffer_size = max_packet_size;
770 (*s)->max_packet_size = max_packet_size;
773 (*s)->read_seek = (int64_t (*)(
void *, int, int64_t, int))h->
prot->
url_read_seek;
788 if (buf_size < filled || s->seekable)
796 memcpy(buffer, s->
buffer, filled);
837 int64_t buffer_start;
839 int overlap, new_size, alloc_size;
850 if ((buffer_start = s->
pos - buffer_size) > buf_size) {
855 overlap = buf_size - buffer_start;
856 new_size = buf_size + buffer_size - overlap;
859 if (alloc_size > buf_size)
860 if (!(buf = (*bufp) =
av_realloc_f(buf, 1, alloc_size)))
863 if (new_size > buf_size) {
864 memcpy(buf + buf_size, s->
buffer + overlap, buffer_size - overlap);
881 return avio_open2(s, filename, flags, NULL, NULL);
890 err =
ffurl_open(&h, filename, flags, int_cb, options);
933 ret =
vsnprintf(buf,
sizeof(buf), fmt, ap);
947 int64_t timestamp,
int flags)
953 ret = s->
read_seek(h, stream_index, timestamp, flags);
957 pos = s->
seek(h, 0, SEEK_CUR);
960 else if (pos !=
AVERROR(ENOSYS))
996 unsigned new_size, new_allocated_size;
999 new_size = d->
pos + buf_size;
1001 if (new_size < d->pos || new_size > INT_MAX/2)
1003 while (new_size > new_allocated_size) {
1004 if (!new_allocated_size)
1005 new_allocated_size = new_size;
1007 new_allocated_size += new_allocated_size / 2 + 1;
1019 memcpy(d->
buffer + d->
pos, buf, buf_size);
1028 unsigned char buf1[4];
1045 if (whence == SEEK_CUR)
1047 else if (whence == SEEK_END)
1049 if (offset < 0 || offset > 0x7fffffffLL)
1058 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1060 if (
sizeof(
DynBuffer) + io_buffer_size < io_buffer_size)
1073 (*s)->max_packet_size = max_packet_size;
1084 if (max_packet_size <= 0)
1114 return size - padding;