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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.co.uk)
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 3 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, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
Spectrum TAP file output handler.
*/
#include <stdlib.h>
#include <stdio.h>
#include "global.h"
#include "specout.h"
/* ---------------------------------------- PRIVATE FUNCTIONS
*/
static Byte TapByte(FILE *fp, Byte b, Byte chk)
{
chk ^= b;
putc(b, fp);
return chk;
}
static Byte TapWord(FILE *fp, int w, Byte chk)
{
chk = TapByte(fp, w & 0xff, chk);
chk = TapByte(fp, (w & 0xff00) >> 8, chk);
return chk;
}
static Byte TapString(FILE *fp, const char *p, int len, Byte chk)
{
while(len--)
{
chk = TapByte(fp, *p ? *p++ : ' ', chk);
}
return chk;
}
/* ---------------------------------------- INTERFACES
*/
const ValueTable *SpecTAPOutputOptions(void)
{
return NULL;
}
CommandStatus SpecTAPOutputSetOption(int opt, int argc, char *argv[],
int quoted[],
char *error, size_t error_size)
{
return CMD_NOT_KNOWN;
}
int SpecTAPOutput(const char *filename, const char *filename_bank,
MemoryBank **bank, int count, char *error, size_t error_size)
{
FILE *fp = fopen(filename, "wb");
int f;
if (!fp)
{
snprintf(error, error_size, "Failed to create %s", filename);
return FALSE;
}
for(f = 0; f < count; f++)
{
Byte chk = 0;
const Byte *mem;
int min, max, len;
mem = bank[f]->memory;
min = bank[f]->min_address_used;
max = bank[f]->max_address_used;
len = max - min + 1;
TapWord(fp, 19, 0);
chk = TapByte(fp, 0, chk);
chk = TapByte(fp, 3, chk);
if (count == 1)
{
chk = TapString(fp, filename, 10, chk);
}
else
{
char fn[16];
snprintf(fn, sizeof fn, filename_bank, bank[f]->number);
chk = TapString(fp, fn, 10, chk);
}
chk = TapWord(fp, len, chk);
chk = TapWord(fp, min, chk);
chk = TapWord(fp, 32768, chk);
TapByte(fp, chk, 0);
/* Output file data
*/
TapWord(fp, len + 2, 0);
chk = 0;
chk = TapByte(fp, 0xff, chk);
while(min <= max)
{
chk = TapByte(fp, mem[min], chk);
min++;
}
TapByte(fp, chk, 0);
}
fclose(fp);
return TRUE;
}
/*
vim: ai sw=4 ts=8 expandtab
*/
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