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40 lines
714 B
40 lines
714 B
6 years ago
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char *argv[]) {
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const char *filename;
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FILE *f;
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unsigned char buf[256], c, *p;
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unsigned int i, mean;
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int bit;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s img.gray\n", argv[0]);
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return -1;
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}
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filename = argv[1];
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f = fopen(filename, "rb");
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if(!f) {
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perror(filename);
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return -1;
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}
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if (fread(buf, sizeof buf, 1, f) != 1) {
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perror(filename);
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fclose(f);
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return -1;
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}
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fclose(f);
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mean = 0;
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for (i = 0; i < sizeof buf; i++)
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mean += buf[i];
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mean /= sizeof buf;
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p = buf;
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for (i = 0; i < sizeof buf / 4; i++) {
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c = 0;
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for (bit = 3; bit >= 0; bit--)
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c |= (*p++ > mean) << bit;
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putchar("0123456789abcdef"[c]);
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}
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return 0;
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}
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