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/*
* Copyright (c) 2016 FUKAUMI Naoki <naobsd@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "buffalo-lib.h"
#define DHP_HEADER_SIZE 20
static char *progname;
static void
usage(void)
{
fprintf(stderr, "usage: %s <in> <out>\n", progname);
exit(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
struct stat in_st;
size_t size;
uint32_t crc;
int in, out;
uint8_t *buf;
progname = argv[0];
if (argc != 3)
usage();
if ((in = open(argv[1], O_RDONLY)) == -1)
err(EXIT_FAILURE, "%s", argv[1]);
if (fstat(in, &in_st) == -1)
err(EXIT_FAILURE, "%s", argv[1]);
size = DHP_HEADER_SIZE + in_st.st_size;
if ((buf = malloc(size)) == NULL)
err(EXIT_FAILURE, "malloc");
memset(buf, 0, DHP_HEADER_SIZE);
buf[0x0] = 0x62;
buf[0x1] = 0x67;
buf[0x2] = 0x6e;
buf[0xb] = 0xb1;
buf[0xc] = (size >> 24) & 0xff;
buf[0xd] = (size >> 16) & 0xff;
buf[0xe] = (size >> 8) & 0xff;
buf[0xf] = size & 0xff;
read(in, &buf[DHP_HEADER_SIZE], in_st.st_size);
close(in);
crc = buffalo_crc(buf, size);
buf[0x10] = (crc >> 24) & 0xff;
buf[0x11] = (crc >> 16) & 0xff;
buf[0x12] = (crc >> 8) & 0xff;
buf[0x13] = crc & 0xff;
if ((out = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1)
err(EXIT_FAILURE, "%s", argv[2]);
write(out, buf, size);
close(out);
free(buf);
return EXIT_SUCCESS;
}
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