libspectrum_error
libspectrum_tape_remove_block( libspectrum_tape *tape,
libspectrum_tape_iterator it )
{
if( it->data ) libspectrum_tape_block_free( it->data );
tape->blocks = g_slist_delete_link( tape->blocks, it );
return LIBSPECTRUM_ERROR_NONE;
}
/* Free the memory used by one block */
static void
block_free( gpointer data, gpointer user_data GCC_UNUSED )
{
libspectrum_tape_block_free( data );
}
/* Convert RLE block to a TZX DRB as TZX CSW block support is limited :/ */
static libspectrum_error
tzx_write_rle( libspectrum_tape_block *block, libspectrum_byte **buffer,
libspectrum_byte **ptr, size_t *length,
libspectrum_tape *tape,
libspectrum_tape_iterator iterator )
{
libspectrum_error error;
libspectrum_tape_block_state it;
libspectrum_dword scale = libspectrum_tape_block_scale( block );
libspectrum_dword pulse_tstates = 0;
libspectrum_dword balance_tstates = 0;
int flags = 0;
libspectrum_tape_block *raw_block =
libspectrum_tape_block_alloc( LIBSPECTRUM_TAPE_BLOCK_RAW_DATA );
libspectrum_tape_block_set_bit_length( raw_block, scale );
libspectrum_tape_block_set_pause ( raw_block, 0 );
rle_state.bits_used = 0;
rle_state.level = 0;
rle_state.length = 0;
rle_state.tape_length = 8192;
rle_state.tape_buffer = libspectrum_malloc( rle_state.tape_length );
*rle_state.tape_buffer = 0;
it.current_block = iterator;
error = libspectrum_tape_block_init( block, &it );
if( error != LIBSPECTRUM_ERROR_NONE ) {
libspectrum_free( rle_state.tape_buffer );
libspectrum_tape_block_free( raw_block );
return error;
}
while( !(flags & LIBSPECTRUM_TAPE_FLAGS_BLOCK) ) {
libspectrum_dword pulse_length = 0;
/* Use internal version of this that doesn't bugger up the
external tape status */
error = libspectrum_tape_get_next_edge_internal( &pulse_tstates, &flags,
tape, &it );
if( error != LIBSPECTRUM_ERROR_NONE ) {
libspectrum_free( rle_state.tape_buffer );
libspectrum_tape_block_free( raw_block );
return error;
}
balance_tstates += pulse_tstates;
/* next set of pulses is: balance_tstates / scale; */
pulse_length = balance_tstates / scale;
balance_tstates = balance_tstates % scale;
/* write pulse_length bits of the current level into the buffer */
write_pulse( pulse_length );
}
if( rle_state.length || rle_state.bits_used ) {
if( rle_state.bits_used ) {
rle_state.length++;
} else {
rle_state.bits_used = 8;
}
error = libspectrum_tape_block_set_bits_in_last_byte( raw_block,
rle_state.bits_used );
if( error != LIBSPECTRUM_ERROR_NONE ) {
libspectrum_free( rle_state.tape_buffer );
libspectrum_tape_block_free( raw_block );
return error;
}
error = libspectrum_tape_block_set_data_length( raw_block,
rle_state.length );
if( error != LIBSPECTRUM_ERROR_NONE ) {
libspectrum_free( rle_state.tape_buffer );
libspectrum_tape_block_free( raw_block );
return error;
}
error = libspectrum_tape_block_set_data( raw_block, rle_state.tape_buffer );
if( error != LIBSPECTRUM_ERROR_NONE ) {
libspectrum_free( rle_state.tape_buffer );
libspectrum_tape_block_free( raw_block );
return error;
}
/* now have tzx_write_raw_data finish the job */
tzx_write_raw_data( raw_block, buffer, ptr, length );
} else {
libspectrum_free( rle_state.tape_buffer );
}
return libspectrum_tape_block_free( raw_block );
}
