/* This does not (fully) work for non-seekable streams... You have to check for that flag, pal! */
static void stream_rewind(mpg123_handle *fr)
{
if(fr->rdat.flags & READER_SEEKABLE)
fr->rdat.buffer.fileoff = fr->rdat.filepos = stream_lseek(fr,0,SEEK_SET);
if(fr->rdat.flags & READER_BUFFERED)
{
fr->rdat.buffer.pos = 0;
fr->rdat.buffer.firstpos = 0;
fr->rdat.filepos = fr->rdat.buffer.fileoff;
}
}
/* This does not (fully) work for non-seekable streams... You have to check for that flag, pal! */
static void stream_rewind(mpg123_handle *fr)
{
if(fr->rdat.flags & READER_SEEKABLE)
{
fr->rdat.filepos = stream_lseek(fr,0,SEEK_SET);
#ifndef NO_FEEDER
fr->rdat.buffer.fileoff = fr->rdat.filepos;
#endif
}
#ifndef NO_FEEDER
if(fr->rdat.flags & READER_BUFFERED)
{
fr->rdat.buffer.pos = 0;
fr->rdat.buffer.firstpos = 0;
fr->rdat.filepos = fr->rdat.buffer.fileoff;
}
#endif
}
// returns reached position... negative ones are bad...
static mpg_off_t stream_skip_bytes( mpg123_handle_t *fr, mpg_off_t len )
{
if( fr->rdat.flags & READER_SEEKABLE )
{
mpg_off_t ret = stream_lseek( fr, len, SEEK_CUR );
return (ret < 0) ? MPG123_ERR : ret;
}
else if( len >= 0 )
{
byte buf[1024]; // ThOr: Compaq cxx complained and it makes sense to me... or should one do a cast? What for?
mpg_ssize_t ret;
while( len > 0 )
{
mpg_ssize_t num = len < (mpg_off_t)sizeof( buf ) ? (mpg_ssize_t)len : (mpg_ssize_t)sizeof( buf );
ret = fr->rd->fullread( fr, buf, num );
if( ret < 0 ) return ret;
else if( ret == 0 ) break; // EOF... an error? interface defined to tell the actual position...
len -= ret;
}
return fr->rd->tell( fr );
}
else if( fr->rdat.flags & READER_BUFFERED )
{
// perhaps we _can_ go a bit back.
if( fr->rdat.buffer.pos >= -len )
{
fr->rdat.buffer.pos += len;
return fr->rd->tell( fr );
}
else
{
fr->err = MPG123_NO_SEEK;
return MPG123_ERR;
}
}
else
{
fr->err = MPG123_NO_SEEK;
return MPG123_ERR;
}
}
/* returns reached position... negative ones are bad... */
static off_t stream_skip_bytes(mpg123_handle *fr,off_t len)
{
if(fr->rdat.flags & READER_SEEKABLE)
{
off_t ret = stream_lseek(fr, len, SEEK_CUR);
return (ret < 0) ? READER_ERROR : ret;
}
else if(len >= 0)
{
unsigned char buf[1024]; /* ThOr: Compaq cxx complained and it makes sense to me... or should one do a cast? What for? */
ssize_t ret;
while (len > 0)
{
ssize_t num = len < (off_t)sizeof(buf) ? (ssize_t)len : (ssize_t)sizeof(buf);
ret = fr->rd->fullread(fr, buf, num);
if (ret < 0) return ret;
else if(ret == 0) break; /* EOF... an error? interface defined to tell the actual position... */
len -= ret;
}
return fr->rd->tell(fr);
}
#ifndef NO_FEEDER
else if(fr->rdat.flags & READER_BUFFERED)
{ /* Perhaps we _can_ go a bit back. */
if(fr->rdat.buffer.pos >= -len)
{
fr->rdat.buffer.pos += len;
return fr->rd->tell(fr);
}
else
{
fr->err = MPG123_NO_SEEK;
return READER_ERROR;
}
}
#endif
else
{
fr->err = MPG123_NO_SEEK;
return READER_ERROR;
}
}
