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30 lines
569 B
C
30 lines
569 B
C
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#include <stdlib.h>
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#include <stdio.h>
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unsigned char buffer[512 * 1024];
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unsigned len;
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FILE *in, *out;
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int n, i;
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int main(int argc, char *argv[]) {
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if (argc < 3) {
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exit(-1);
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}
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in = fopen(argv[1], "rb");
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out = fopen(argv[2], "wb");
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if (!in || !out) {
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exit(-1);
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}
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len = fread(buffer, 1, 512 * 1024, in);
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n = 0; for (i = 0x1000; i < 0x2000; i++) {
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n += buffer[i];
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}
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buffer[0] = n & 0xff;
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buffer[1] = (n >> 8) & 0xff;
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fwrite(buffer, 1, len, out);
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fclose(in);
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fclose(out);
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return (0);
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}
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