delta

delta.zig

    const endian = @import("builtin").cpu.arch.endian();
    var bytes: usize = 0;
    const a = std.mem.toBytes(copy)[0..376];
    const b = std.mem.toBytes(battle.*)[0..376];
    var diffs: [128]u8 = undefined;
    var i: usize = 0;
    var j: usize = 0;
    while (i < 376) : (i += 2) {
        const ai = std.mem.bytesAsValue(u16, a[i .. i + 2]).*;
        if (ai != std.mem.bytesAsValue(u16, b[i .. i + 2]).*) {
            std.mem.writeInt(u16, diffs[j..], ai, endian);
            j += 2;
            diffs[j] = i;
            j += 1;
        }
    }