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