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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char ** argv) {
FILE * in1, * in2, * out;
size_t s1, s2, p, b, c;
int b1, b2;
if (argc != 4) { printf("Usage: %s fin1 fin2 fout\n", argv[0]); exit(-1); }
if ((in1 = fopen(argv[1], "rb")) == 0) { printf("Error opening %s\n", argv[1]); perror("fopen"); exit(-1); }
if ((in2 = fopen(argv[2], "rb")) == 0) { printf("Error opening %s\n", argv[2]); perror("fopen"); exit(-1); }
if ((out = fopen(argv[3], "wb")) == 0) { printf("Error opening %s\n", argv[3]); perror("fopen"); exit(-1); }
fseek(in1, 0, SEEK_END); s1 = ftell(in1); fseek(in1, 0, SEEK_SET);
fseek(in2, 0, SEEK_END); s2 = ftell(in2); fseek(in2, 0, SEEK_SET);
if (s1 != s2) { printf("Error: files are of different sizes.\n"); exit(-1); }
b = s1 - 1;
fprintf(out, "patch = {\n");
for (p = 0; p < s1; p++) {
b1 = fgetc(in1);
b2 = fgetc(in2);
if (b1 != b2) {
b++;
if ((b != p) && (b != s1)) fprintf(out, " },\n");
if (b != p) { fprintf(out, " [0x%06x] = { ", p); c = 0; } else { fprintf(out, ", "); c++; }
if (c == 16) { fprintf(out, "\n "); c = 0; }
fprintf(out, "0x%02x", b2);
b = p;
}
}
fprintf(out, " },\n}\n");
fclose(in1); fclose(in2); fclose(out);
}
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