/*****************************************************************************
* Read commands.
*****************************************************************************/
static int libc_read ( dvdcss_t dvdcss, void *p_buffer, int i_blocks )
{
off_t i_size, i_ret, i_ret_blocks;
i_size = (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE;
i_ret = 0;
while (i_ret < i_size)
{
off_t i_r;
i_r = read(dvdcss->i_fd, ((char*)p_buffer) + i_ret, i_size - i_ret);
if (i_r < 0)
{
print_error(dvdcss, "read error");
dvdcss->i_pos = -1;
return i_r;
}
if (i_r == 0)
break;
i_ret += i_r;
}
i_ret_blocks = i_ret / DVDCSS_BLOCK_SIZE;
/* Handle partial reads */
if( i_ret != i_size )
{
int i_seek, i_set_pos;
i_set_pos = dvdcss->i_pos + i_ret_blocks;
dvdcss->i_pos = -1;
i_seek = libc_seek( dvdcss, i_set_pos );
if( i_seek < 0 )
{
return i_seek;
}
/* We have to return now so that i_pos isn't clobbered */
return i_ret_blocks;
}
dvdcss->i_pos += i_ret_blocks;
return i_ret_blocks;
}
/*****************************************************************************
* Readv commands.
*****************************************************************************/
static int libc_readv ( dvdcss_t dvdcss, const struct iovec *p_iovec,
int i_blocks )
{
#if defined( _WIN32 )
int i_index, i_len, i_total = 0;
unsigned char *p_base;
int i_bytes;
for( i_index = i_blocks;
i_index;
i_index--, p_iovec++ )
{
i_len = p_iovec->iov_len;
p_base = p_iovec->iov_base;
if( i_len <= 0 )
{
continue;
}
i_bytes = read( dvdcss->i_fd, p_base, i_len );
if( i_bytes < 0 )
{
/* One of the reads failed, too bad.
* We won't even bother returning the reads that went OK,
* and as in the POSIX spec the file position is left
* unspecified after a failure */
dvdcss->i_pos = -1;
return -1;
}
i_total += i_bytes;
i_total /= DVDCSS_BLOCK_SIZE;
if( i_bytes != i_len )
{
/* We reached the end of the file or a signal interrupted
* the read. Return a partial read. */
int i_seek;
dvdcss->i_pos = -1;
i_seek = libc_seek( dvdcss, i_total );
if( i_seek < 0 )
{
return i_seek;
}
/* We have to return now so that i_pos isn't clobbered */
return i_total;
}
}
dvdcss->i_pos += i_total;
return i_total;
#else
int i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
if( i_read < 0 )
{
dvdcss->i_pos = -1;
return i_read;
}
i_read /= DVDCSS_BLOCK_SIZE;
dvdcss->i_pos += i_read;
return i_read;
#endif
}
