Unlocks all levels in the Half-Life: Decay PC "port".

decay-unlocker.cpp

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

int main(int argc, char* argv[]) {
	FILE* file;
	fopen_s(&file, "save0.sv2", "rb");

	if (!file) {
		printf("You must run this next to \"save0.sv2\"!\n");
		return -1;
	}

	fseek(file, 0, SEEK_END);
	int size = ftell(file);
	fseek(file, 0, SEEK_SET);

	uint8_t* data = (uint8_t*)malloc(size + 1);
	fread(data, size, 1, file);
	fclose(file);

	for (int i = 0xA3; i < size; i += 0x174) {
		uint8_t b = data[i];
		printf("0x%X\n", b);
		data[i] = 0x0;
	}

	fopen_s(&file, "save0.sv2", "wb");
	fwrite(data, size, 1, file);
	fclose(file);

	return 0;
}