static libspectrum_error
pure_data_init( libspectrum_tape_pure_data_block *block,
libspectrum_tape_pure_data_block_state *state )
{
libspectrum_error error;
/* We're just before the start of the data */
state->bytes_through_block = -1; state->bits_through_byte = 7;
/* Set up the next bit */
error = libspectrum_tape_pure_data_next_bit( block, state );
if( error ) return error;
return LIBSPECTRUM_ERROR_NONE;
}
static libspectrum_error
pure_data_edge( libspectrum_tape_pure_data_block *block,
libspectrum_tape_pure_data_block_state *state,
libspectrum_dword *tstates, int *end_of_block )
{
int error;
switch( state->state ) {
case LIBSPECTRUM_TAPE_STATE_DATA1:
/* The first edge for a bit of data */
*tstates = state->bit_tstates;
/* Followed by the second edge */
state->state = LIBSPECTRUM_TAPE_STATE_DATA2;
break;
case LIBSPECTRUM_TAPE_STATE_DATA2:
/* The second edge for a bit of data */
*tstates = state->bit_tstates;
/* Followed by the next bit of data (or the end of data) */
error = libspectrum_tape_pure_data_next_bit( block, state );
if( error ) return error;
break;
case LIBSPECTRUM_TAPE_STATE_PAUSE:
/* The pause at the end of the block */
*tstates = (block->pause * 69888)/20; /* FIXME: should vary with tstates
per frame */
*end_of_block = 1;
break;
default:
libspectrum_print_error( LIBSPECTRUM_ERROR_LOGIC,
"pure_data_edge: unknown state %d",
state->state );
return LIBSPECTRUM_ERROR_LOGIC;
}
return LIBSPECTRUM_ERROR_NONE;
}
