package crc32_test;

import hash.crc32;

fn putstr(s: str, into: []u8, off: i32) i32 = {
	let i: i32 = 0;
	for (i < s.len) {
		into[off + i] = s[i];
		i += 1;
	};
	return off + s.len;
};

fn check(s: str, ieee: u32, cast: u32, koop: u32) void = {
	let arr: [128]u8;
	let n: i32 = putstr(s, arr[0:128], 0);
	let buf: []u8 = arr[0:n];
	assert(!(crc32.sum32ieee(buf)       != ieee));
	assert(!(crc32.sum32castagnoli(buf) != cast));
	assert(!(crc32.sum32koopman(buf)    != koop));
};

@test fn vec_empty() void = {
	let arr: [1]u8;
	let buf: []u8 = arr[0:0];
	assert(!(crc32.sum32ieee(buf)       != 0u32));
	assert(!(crc32.sum32castagnoli(buf) != 0u32));
	assert(!(crc32.sum32koopman(buf)    != 0u32));
};

@test fn vec_fire() void = {
	check("Give a man a fire, they be warm for a day",
		4026734998u32, 2112273292u32, 1263149916u32);
};

@test fn vec_setfire() void = {
	check("Set a man on fire, they be warm for the rest of their life",
		3931092334u32, 4172943610u32, 3071632577u32);
};

@test fn vec_blm() void = {
	check("Black lives matter",
		2370964079u32, 2068416418u32, 4151357773u32);
};

@test fn vec_unix() void = {
	check("UNIX is simple and coherent",
		3254252081u32, 1650777601u32, 340189632u32);
};

@test fn vec_gnu() void = {
	check("GNU's not UNIX",
		224734747u32, 200511816u32, 332335539u32);
};