32 lines
643 B
C
32 lines
643 B
C
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#define SIZE (1024*1024)
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int main() {
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FILE *in = fopen("source", "r");
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FILE *out = fopen("cracked", "wb");
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char buffer[SIZE];
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size_t bytes;
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while (0 < (bytes = fread(buffer, 1, sizeof(buffer), in)))
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fwrite(buffer, 1, bytes, out);
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/* 0xe1feff54 */
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unsigned int pattern = 0x54fffee1;
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/* 0x1f2003d5 */
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unsigned int new = 0xd503201f;
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char buf[4];
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fseek(out, 0x520, SEEK_SET);
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while (0 < (bytes = fread(buf, 1, sizeof(buf), out)))
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if (*(unsigned int *)buf == pattern)
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break;
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fwrite(&new, 4, 1, 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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