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simplify url_fseek() 

Originally committed as revision 6316 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-09-22 10:03:04 +00:00
parent 8e06f20abf
commit f40d17398d
1 changed files with 24 additions and 39 deletions
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63
libavformat/aviobuf.c
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@ -106,56 +106,41 @@ void put_flush_packet(ByteIOContext *s)
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
{
offset_t offset1;
offset_t pos= s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
if (whence != SEEK_CUR && whence != SEEK_SET)
return -EINVAL;
if (whence == SEEK_CUR) {
offset1 = pos + (s->buf_ptr - s->buffer);
if (offset == 0)
return offset1;
offset += offset1;
}
offset1 = offset - pos;
if (!s->must_flush &&
offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
/* can do the seek inside the buffer */
s->buf_ptr = s->buffer + offset1;
} else {
if (!s->seek)
return -EPIPE;
#ifdef CONFIG_MUXERS
if (s->write_flag) {
if (whence == SEEK_CUR) {
offset1 = s->pos + (s->buf_ptr - s->buffer);
if (offset == 0)
return offset1;
offset += offset1;
}
offset1 = offset - s->pos;
if (!s->must_flush &&
offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
/* can do the seek inside the buffer */
s->buf_ptr = s->buffer + offset1;
} else {
if (!s->seek)
return -EPIPE;
if (s->write_flag) {
flush_buffer(s);
s->must_flush = 1;
s->buf_ptr = s->buffer;
s->seek(s->opaque, offset, SEEK_SET);
s->pos = offset;
}
} else
} else
#endif //CONFIG_MUXERS
{
if (whence == SEEK_CUR) {
offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
if (offset == 0)
return offset1;
offset += offset1;
}
offset1 = offset - (s->pos - (s->buf_end - s->buffer));
if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
/* can do the seek inside the buffer */
s->buf_ptr = s->buffer + offset1;
} else {
if (!s->seek)
return -EPIPE;
s->buf_ptr = s->buffer;
{
s->buf_end = s->buffer;
if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
return -EPIPE;
s->pos = offset;
}
s->eof_reached = 0;
s->buf_ptr = s->buffer;
if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
return -EPIPE;
s->pos = offset;
}
s->eof_reached = 0;
return offset;
}