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/* z80em.c: Routines for handling Z80Em raw audio files
Copyright (c) 2015 Stuart Brady
Copyright (c) 2002 Darren Salt
Based on tap.c, copyright (c) 2001 Philip Kendall
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: linux@youmustbejoking.demon.co.uk
*/
#include "config.h"
#include <string.h>
#include "internals.h"
#include "tape_block.h"
libspectrum_error
libspectrum_z80em_read( libspectrum_tape *tape,
const libspectrum_byte *buffer, size_t length )
{
libspectrum_tape_block *block;
libspectrum_tape_rle_pulse_block *z80em_block;
static const char id[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0Raw tape sample";
if( length < sizeof( id ) ) {
libspectrum_print_error(
LIBSPECTRUM_ERROR_CORRUPT,
"libspectrum_z80em_read: not enough data in buffer"
);
return LIBSPECTRUM_ERROR_CORRUPT;
}
if( memcmp( id, buffer, sizeof( id ) ) ) {
libspectrum_print_error( LIBSPECTRUM_ERROR_SIGNATURE,
"libspectrum_z80em_read: wrong signature" );
return LIBSPECTRUM_ERROR_SIGNATURE;
}
block = libspectrum_tape_block_alloc( LIBSPECTRUM_TAPE_BLOCK_RLE_PULSE );
z80em_block = &block->types.rle_pulse;
z80em_block->scale = 7; /* 1 time unit == 7 clock ticks */
buffer += sizeof( id );
length -= sizeof( id );
/* Claim memory for the data (it's one big lump) */
z80em_block->length = length;
z80em_block->data = libspectrum_new( libspectrum_byte, length );
/* Copy the data across */
memcpy( z80em_block->data, buffer, length );
libspectrum_tape_append_block( tape, block );
return LIBSPECTRUM_ERROR_NONE;
}
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