static mpg_ssize_t feed_read( mpg123_handle_t *fr, byte *out, mpg_ssize_t count )
{
mpg_ssize_t gotcount = bc_give( &fr->rdat.buffer, out, count );
if( gotcount >= 0 && gotcount != count )
return MPG123_ERR;
return gotcount;
}
static ssize_t buffered_fullread(mpg123_handle *fr, unsigned char *out, ssize_t count)
{
struct bufferchain *bc = &fr->rdat.buffer;
ssize_t gotcount;
if(bc->size - bc->pos < count)
{ /* Add more stuff to buffer. If hitting end of file, adjust count. */
unsigned char readbuf[BUFFBLOCK];
ssize_t need = count - (bc->size-bc->pos);
while(need>0)
{
int ret;
ssize_t got = fr->rdat.fullread(fr, readbuf, BUFFBLOCK);
if(got < 0)
{
if(NOQUIET) error("buffer reading");
return READER_ERROR;
}
if(VERBOSE3) debug1("buffered_fullread: buffering %li bytes from stream (if > 0)", (long)got);
if(got > 0 && (ret=bc_add(bc, readbuf, got)) != 0)
{
if(NOQUIET) error1("unable to add to chain, return: %i", ret);
return READER_ERROR;
}
need -= got; /* May underflow here... */
if(got < BUFFBLOCK) /* That naturally catches got == 0, too. */
{
if(VERBOSE3) fprintf(stderr, "Note: Input data end.\n");
break; /* End. */
}
}
if(bc->size - bc->pos < count)
count = bc->size - bc->pos; /* We want only what we got. */
}
gotcount = bc_give(bc, out, count);
if(VERBOSE3) debug2("wanted %li, got %li", (long)count, (long)gotcount);
if(gotcount != count) {
if(NOQUIET) error("gotcount != count");
return READER_ERROR;
}
else return gotcount;
}
// the specific stuff for buffered stream reader.
static mpg_ssize_t buffered_fullread( mpg123_handle_t *fr, byte *out, mpg_ssize_t count )
{
bufferchain_t *bc = &fr->rdat.buffer;
mpg_ssize_t gotcount;
if( bc->size - bc->pos < count )
{
// add more stuff to buffer. If hitting end of file, adjust count.
byte readbuf[4096];
mpg_ssize_t need = count - (bc->size - bc->pos);
while( need > 0 )
{
mpg_ssize_t got = fr->rdat.fullread( fr, readbuf, sizeof( readbuf ));
int ret;
if( got < 0 )
return MPG123_ERR;
if( got > 0 && ( ret = bc_add( bc, readbuf, got )) != 0 )
return MPG123_ERR;
need -= got; // may underflow here...
if( got < sizeof( readbuf )) // that naturally catches got == 0, too.
break; // end.
}
if( bc->size - bc->pos < count )
count = bc->size - bc->pos; // we want only what we got.
}
gotcount = bc_give( bc, out, count );
if( gotcount != count )
return MPG123_ERR;
return gotcount;
}
static ssize_t feed_read(mpg123_handle *fr, unsigned char *out, ssize_t count)
{
ssize_t gotcount = bc_give(&fr->rdat.buffer, out, count);
if(gotcount >= 0 && gotcount != count) return READER_ERROR;
else return gotcount;
}