std.zlib

uncompress directly.

import std.zlib;

auto src =
"the quick brown fox jumps over the lazy dog\r
 the quick brown fox jumps over the lazy dog\r";

ubyte[] dst;
ubyte[] result;

dst = compress(src);
result = cast(ubyte[]) uncompress(dst);
assert(result == src);

When the data to be compressed doesn't fit in one buffer, use Compress and UnCompress.

import std.zlib;
import std.stdio;
import std.conv : to;
import std.algorithm.iteration : map;

UnCompress decmp = new UnCompress;
foreach (chunk; stdin.byChunk(4096).map!(x => decmp.uncompress(x)))
{
    chunk.to!string.write;
}

References: Wikipedia