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restore old buffer content when seek failed in http protocol, fix issue #1631

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Originally committed as revision 21208 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2010-01-13 23:27:52 +00:00
parent a1f42882e1
commit 08c8e66a99
1 changed files with 7 additions and 0 deletions
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7
libavformat/http.c
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@ -394,6 +394,8 @@ static int64_t http_seek(URLContext *h, int64_t off, int whence)
HTTPContext *s = h->priv_data;
URLContext *old_hd = s->hd;
int64_t old_off = s->off;
uint8_t old_buf[BUFFER_SIZE];
int old_buf_size;
if (whence == AVSEEK_SIZE)
return s->filesize;
@ -401,6 +403,8 @@ static int64_t http_seek(URLContext *h, int64_t off, int whence)
return -1;
/* we save the old context in case the seek fails */
old_buf_size = s->buf_end - s->buf_ptr;
memcpy(old_buf, s->buf_ptr, old_buf_size);
s->hd = NULL;
if (whence == SEEK_CUR)
off += s->off;
@ -410,6 +414,9 @@ static int64_t http_seek(URLContext *h, int64_t off, int whence)
/* if it fails, continue on old connection */
if (http_open_cnx(h) < 0) {
memcpy(s->buffer, old_buf, old_buf_size);
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + old_buf_size;
s->hd = old_hd;
s->off = old_off;
return -1;