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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#ifndef VERSION
#define VERSION "???"
#endif
#define SELF "xfd2atr"
#define USAGE \
SELF " v" VERSION " by B. Watson (WTFPL)\n" \
"Usage: " SELF " -[sd] input.xfd [output.atr]\n"
int main(int argc, char **argv) {
struct stat st;
char infile[4096], outfile[4096];
FILE *in, *out;
int i, paras, secsize = 0, seccount;
if(argc < 2 || argc > 4) {
fprintf(stderr, USAGE);
exit(1);
}
if(argv[1][0] == '-') {
switch(argv[1][1]) {
case 's':
secsize = 128;
break;
case 'd':
secsize = 256;
break;
default:
fprintf(stderr,
SELF ": invalid option -'%c'\n" USAGE, argv[1][1]);
}
argv++; argc--;
}
strcpy(infile, argv[1]);
if(argc == 3) {
strcpy(outfile, argv[2]);
} else if(strcmp(infile, "-") == 0) {
strcpy(outfile, "-");
} else {
char *p;
strcpy(outfile, argv[1]);
p = strstr(outfile, ".xfd");
if(!p) p = strstr(outfile, ".XFD");
if(!p) p = outfile + strlen(outfile);
strcpy(p, ".atr");
}
fprintf(stderr, SELF ": input '%s', output '%s'\n", infile, outfile);
if(strcmp(infile, "-") == 0) {
in = stdin;
} else {
if( !(in = fopen(infile, "rb")) ) {
fprintf(stderr, SELF ": (fatal) can't read %s: %s\n",
infile, strerror(errno));
exit(1);
}
}
if(fstat(fileno(in), &st)) {
fprintf(stderr, SELF ": (fatal) can't stat %s: %s\n",
infile, strerror(errno));
exit(1);
}
/* A few sanity checks... */
if(st.st_size < 384) {
fprintf(stderr,
SELF ": (fatal) %s too small to be an XFD image (<384 bytes)\n",
infile);
exit(2);
}
if(st.st_size % 128 == 16) {
fprintf(stderr,
SELF ": (fatal) %s looks like an ATR image, not an XFD\n",
infile);
exit(2);
}
if(st.st_size % 128 != 0) {
fprintf(stderr,
SELF ": (fatal) %s not a valid XFD image (not an even number "
"of sectors)\n", infile);
exit(2);
}
if(st.st_size > (65535 * 256)) {
fprintf(stderr, SELF ": (fatal) %s too large to be an XFD image (>16M)\n",
infile);
exit(2);
}
if(!secsize) {
char *type;
fprintf(stderr, SELF ": guessing type; use -s or -d to set.\n");
/* Automagically figure out the sector size and count */
if(st.st_size == 720 * 128) {
type = "90K SS/SD image";
secsize = 128;
} else if(st.st_size == 1040 * 128) {
type = "130K SS/ED image";
secsize = 128;
} else if(st.st_size == 720 * 256 - 128 * 3) {
type = "180K SS/DD image";
secsize = 256;
} else if(st.st_size == 1440 * 256 - 128 * 3) {
type = "360K DS/DD image";
secsize = 256;
} else if(st.st_size < 720 * 128) {
type = "<90K image, assuming SD";
secsize = 128;
} else if(st.st_size > 720 * 128 && st.st_size < 1040 * 128) {
type = ">90K, <130K image, assuming SD sectors";
secsize = 128;
} else if(st.st_size % 256 == 0) {
fprintf(stderr, SELF ": Non-standard %dK image, assuming SD sectors\n",
(int)st.st_size / 1024);
type = "Large floppy or hard disk, SD";
secsize = 128;
} else {
fprintf(stderr, SELF ": Non-standard %dK image, assuming DD sectors\n",
(int)st.st_size / 1024);
type = "Large floppy or hard disk, DD";
secsize = 256;
}
fprintf(stderr, SELF ": guessed type: %s\n", type);
}
if(secsize == 128) {
seccount = st.st_size / secsize;
if(seccount & 1)
fprintf(stderr, SELF ": odd number of sectors in SD image, might "
"actually be DD (try with -d?)\n");
} else {
seccount = (st.st_size - 384) / secsize + 3;
if(st.st_size % 256 != 128)
fprintf(stderr, SELF ": partial sector at end of DD image, might "
"actually be SD (try with -s?)\n");
}
/* One last sanity check */
if(seccount > 65535) {
fprintf(stderr,
SELF ": (fatal) %s too large to be an XFD image "
"at current density (>65535 sectors)\n",
infile);
if(secsize == 128)
fprintf(stderr, SELF ": Try forcing double density with -d\n");
exit(2);
}
fprintf(stderr, SELF ": sectors: %d, sector size: %d bytes",
seccount, secsize);
if(secsize == 256)
fprintf(stderr, " (first 3 sectors are 128 bytes)");
fputc('\n', stderr);
paras = st.st_size / 16;
fprintf(stderr, SELF ": %d 16-byte paragraphs\n", paras);
/* Only open the output file after the XFD is known to be good */
if(strcmp(outfile, "-") == 0) {
out = stdout;
} else {
if( !(out = fopen(outfile, "wb")) ) {
fprintf(stderr, SELF ": (fatal) can't write %s: %s\n",
outfile, strerror(errno));
exit(1);
}
}
/* output ATR header: */
fputc(0x96, out); /* NICKATARI cksum, lo byte */
fputc(0x02, out); /* NICKATARI cksum, hi byte */
fputc(paras & 0xff, out); /* paragraphs, lo byte */
fputc((paras >> 8) & 0xff, out); /* paragraphs, mid byte */
fputc(secsize & 0xff, out); /* sector size, lo byte */
fputc(secsize >> 8, out); /* sector size, hi byte */
fputc((paras >> 16) & 0xff, out); /* paragraphs, hi byte */
/* unused ATR header bytes */
for(i=0; i<9; i++)
fputc('\0', out);
/* copy the data */
while( (i = fgetc(in)) != EOF )
fputc(i, out);
/* fgetc() returns EOF on error *or* EOF;
check for I/O errors, return 1 if so */
i = 0;
if(ferror(in)) {
i = 1;
fprintf(stderr,
SELF ": error reading %s: %s\n", infile, strerror(errno));
}
if(ferror(out)) {
i = 1;
fprintf(stderr,
SELF ": error writing %s: %s\n", outfile, strerror(errno));
}
fclose(in);
fclose(out);
return i;
}
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