Lzo

// LZO instance. (Usually a single one can be shared globally.)
auto lzo = new Lzo;

// Typical function to decompress a buffer that was received over the
// network. (i.e. where the buffer and the expected length of the
// decompressed data are both received from an external source.)
void decompress ( in void[] src, size_t expected_decompressed_length,
    ref void[] dst )
{
    dst.length = expected_decompressed_length;
    assumeSafeAppend(dst);
    auto decompressed_length = lzo.decompressSafe(src, dst);

    // Check that the length of the uncompressed data is what we expected.
    // (It is important to verify this, when the data was received
    // externally.)
    enforce(decompressed_length == expected_decompressed_length);
}

auto original = "compress this!";

// Compress.
auto compressed = new void[lzo.maxCompressedLength(original.length)];
compressed.length = lzo.compress(original, compressed);

// Decompress.
void[] decompressed;
decompress(compressed, original.length, decompressed);

// We should have the original string back now.
test!("==")(decompressed, original);