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hdfmt.c
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hdfmt.c
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#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DIR_SECTORS 5
#define INITIAL_SECTORS (DIR_SECTORS+2)
#define DSC_LEN 22
#define SECTOR_SIZE 256
#define SECTORS_PER_TRACK 33
#define HEADS 4
static int parse_size_and_adjust(const char *size)
{
int value;
char *end;
value = strtol(size, &end, 10);
switch (*end) {
case 'k':
case 'K':
value *= 1024;
break;
case 'm':
case 'M':
value *= 1024 * 1024;
break;
case 'g':
case 'G':
value *= 1024 * 1024 * 1024;
break;
}
// adjust size of the created volume to match the expected geometry which is
// a size evenly dividable as given below
value = value - (value % (SECTOR_SIZE * SECTORS_PER_TRACK * HEADS));
return value;
}
static inline void write16(uint8_t *base, uint32_t value)
{
base[0] = value & 0xff;
base[1] = (value >> 8) & 0xff;
}
static inline void write24(uint8_t *base, uint32_t value)
{
write16(base, value);
base[2] = (value >> 16) & 0xff;
}
static uint8_t checksum(uint8_t *base)
{
int i = 255, c = 0;
unsigned sum = 255;
while (--i >= 0)
{
sum += base[i] + c;
c = 0;
if (sum >= 256) {
sum &= 0xff;
c = 1;
}
}
return sum;
}
static void setup_freemap(uint8_t *base, int sectors)
{
int free_sect = sectors - INITIAL_SECTORS;
base[0x000] = INITIAL_SECTORS; // position of first free space.
write24(base + 0x0fc, sectors);
base[0x0ff] = checksum(base);
putchar('\n');
write24(base + 0x100, free_sect);
write16(base + 0x1fb, rand()); // disc ID
base[0x1fe] = 3;
base[0x1ff] = checksum(base + 0x100);
}
static void setup_root_dir(uint8_t *base)
{
strcpy((char *)(base+0x001), "Hugo");
base[0x4cc] = '$';
base[0x4d6] = 2;
base[0x4d9] = '$';
strcpy((char *)(base+0x4fb), "Hugo");
}
static int adfs_format(const char *fn, FILE *fp, int sectors)
{
int status = 0;
uint8_t *data = calloc(INITIAL_SECTORS, 256);
if (data)
{
setup_freemap(data, sectors);
setup_root_dir(data + 0x200);
if (fwrite(data, 256, INITIAL_SECTORS, fp) != INITIAL_SECTORS)
{
fprintf(stderr, "hdfmt: error writing to %s: %s\n", fn, strerror(errno));
status = 2;
}
// fill the rest of the image with 0x00
uint8_t *fill = calloc(1,256);
memset(fill,0,256);
for(int cs=INITIAL_SECTORS;cs<sectors;cs++)
fwrite(fill,256,1,fp);
free(fill);
}
return status;
}
int main(int argc, char **argv)
{
const char *fn;
int status, len, size, sectors, cyl;
char *dat_fn, *dsc_fn;
unsigned char geom[DSC_LEN];
FILE *dat_fp, *dsc_fp;
// we don't want random stuff in the dsc-file
memset(geom,0,DSC_LEN);
if (argc == 3)
{
size = parse_size_and_adjust(argv[2]);
if (size > 0)
{
fn = argv[1];
len = strlen(fn) + 5;
dat_fn = alloca(len);
snprintf(dat_fn, len, "%s.dat", fn);
dsc_fn = alloca(len);
snprintf(dsc_fn, len, "%s.dsc", fn);
if ((dat_fp = fopen(dat_fn, "wb")))
{
if ((dsc_fp = fopen(dsc_fn, "wb")))
{
sectors = size / SECTOR_SIZE;
cyl = size / (SECTOR_SIZE * SECTORS_PER_TRACK * HEADS);
geom[13] = (unsigned char) ((((unsigned short) cyl) & 0xFF00) >> 8);
geom[14] = (unsigned char) (((unsigned short) cyl) & 0x00FF);
geom[15] = (unsigned char) (((unsigned short) HEADS) & 0x00FF);
fprintf(stdout,"hdfmt: size=%d sectors=%d sector_size=%d sectors_per_track=%d heads=%d cylinders=%d\n",
size, sectors, SECTOR_SIZE, SECTORS_PER_TRACK, HEADS, cyl);
if (fwrite(geom, sizeof geom, 1, dsc_fp) != 1)
{
fprintf(stderr, "hdfmt: unable to write to dsc file %s: %s\n", dsc_fn, strerror(errno));
status = 1;
}
fclose(dsc_fp);
status = adfs_format(dat_fn, dat_fp, sectors);
}
else
{
fprintf(stderr, "hdfmt: unable to create dsc file %s: %s\n", dsc_fn, strerror(errno));
status = 2;
}
fclose(dat_fp);
}
else
{
fprintf(stderr, "hdfmt: unable to create data file %s: %s\n", dat_fn, strerror(errno));
status = 2;
}
}
else
{
fprintf(stderr, "hdfmt: %s is not a valid size\n", argv[2]);
status = 1;
}
}
else
{
fputs("usage: hdfmt <dat-file> <size>\n", stderr);
status = 1;
}
return status;
}