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/* snp.c: Routines for handling .snp snapshots
Copyright (c) 1998,2003 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: philip-fuse@shadowmagic.org.uk
*/
#include "config.h"
#include "internals.h"
#define SNP_TRAILER_LENGTH 31
libspectrum_error
libspectrum_snp_read( libspectrum_snap *snap, const libspectrum_byte *buffer,
size_t length )
{
libspectrum_error error;
/* Length must be at least 48K of RAM plus the 'trailer' */
if( length < 0xc000 + SNP_TRAILER_LENGTH ) {
libspectrum_print_error(
LIBSPECTRUM_ERROR_CORRUPT,
"libspectrum_snp_read: not enough bytes for a .snp file"
);
return LIBSPECTRUM_ERROR_CORRUPT;
}
/* All .snp snaps are of the 48K machine */
libspectrum_snap_set_machine( snap, LIBSPECTRUM_MACHINE_48 );
/* Get the RAM */
error = libspectrum_split_to_48k_pages( snap, buffer );
if( error != LIBSPECTRUM_ERROR_NONE ) return error;
buffer += 0xc000;
libspectrum_snap_set_f ( snap, buffer[ 0] );
libspectrum_snap_set_a ( snap, buffer[ 1] );
libspectrum_snap_set_out_ula( snap, buffer[ 2] );
/* Byte 3 not used */
libspectrum_snap_set_bc ( snap, buffer[ 4] + buffer[ 5] * 0x100 );
libspectrum_snap_set_de ( snap, buffer[ 6] + buffer[ 7] * 0x100 );
libspectrum_snap_set_hl ( snap, buffer[ 8] + buffer[ 9] * 0x100 );
libspectrum_snap_set_pc ( snap, buffer[10] + buffer[11] * 0x100 );
libspectrum_snap_set_sp ( snap, buffer[12] + buffer[13] * 0x100 );
libspectrum_snap_set_ix ( snap, buffer[14] + buffer[15] * 0x100 );
libspectrum_snap_set_iy ( snap, buffer[16] + buffer[17] * 0x100 );
libspectrum_snap_set_iff1 ( snap, buffer[18] );
libspectrum_snap_set_iff2 ( snap, buffer[19] );
libspectrum_snap_set_im ( snap, buffer[20] );
libspectrum_snap_set_r ( snap, buffer[21] );
libspectrum_snap_set_i ( snap, buffer[22] );
libspectrum_snap_set_f_ ( snap, buffer[23] );
libspectrum_snap_set_a_ ( snap, buffer[24] );
libspectrum_snap_set_bc_ ( snap, buffer[25] + buffer[26] * 0x100 );
libspectrum_snap_set_de_ ( snap, buffer[27] + buffer[28] * 0x100 );
libspectrum_snap_set_hl_ ( snap, buffer[29] + buffer[30] * 0x100 );
return LIBSPECTRUM_ERROR_NONE;
}
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