dlang toHexString

import std.digest.crc, std.digest.digest, std.stdio;

string computeCrc32_A(string path)
{
    CRC32 crc;
    auto file = File(path, "rb");
    foreach (ubyte[] data; chunks(file, 4096)) {
        crc.put(data);
    }

    return crcHexString(crc.finish());
}

string computeCrc32_B(string path)
{
    CRC32 crc;
    auto file = File(path, "rb");
    foreach (ubyte[] data; chunks(file, 4096)) {
        crc.put(data);
    }

    return toHexString!(Order.decreasing)(crc.finish()); // return nothing or garbage
}

void main()
{
    writeln(computeCrc32_A("file.txt"));  // OK
    writeln(computeCrc32_B("file.txt"));   // write nothing or garbage
}