64 lines
931 B
C
64 lines
931 B
C
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/*
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* hex2bin - simple hex to bin filter
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* antirez@invece.org - under GPL version 2
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*/
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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int hex2bin(void)
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{
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char hex[3];
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int d = 0;
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unsigned char c;
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int stdin_fd = fileno(stdin);
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int n_read;
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while((n_read = read(stdin_fd, hex, 2)) > 0)
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{
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if (n_read == 1)
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{
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if (hex[0] != '\n')
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{
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fprintf(stderr,
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"input parse error, odd digits in hex file\n");
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exit(1);
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}
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else
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exit(1);
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}
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hex[2] = '\0';
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sscanf(hex, "%x", &d);
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c = (unsigned char) d;
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printf("%c", c);
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}
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return 0;
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}
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int bin2hex(void)
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{
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int stdin_fd = fileno(stdin);
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int n_read;
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unsigned char c;
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while((n_read = read(stdin_fd, &c, 1)) > 0)
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{
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printf("%.2x", c);
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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if (argc >= 2 && strstr(argv[1], "-r"))
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bin2hex();
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else
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hex2bin();
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return 0;
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}
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