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copied!<p>You can still use the <a href="https://docs.python.org/2/library/zlib.html" rel="noreferrer"><code>zlib</code></a> module to inflate/deflate data. The <a href="https://docs.python.org/2/library/gzip.html" rel="noreferrer"><code>gzip</code></a> module uses it internally, but adds a file-header to make it into a gzip-file. Looking at the <a href="http://hg.python.org/cpython/file/8ebda8114e97/Lib/gzip.py" rel="noreferrer"><code>gzip.py</code></a> file, something like this could work:</p> <pre><code>import zlib def deflate(data, compresslevel=9): compress = zlib.compressobj( compresslevel, # level: 0-9 zlib.DEFLATED, # method: must be DEFLATED -zlib.MAX_WBITS, # window size in bits: # -15..-8: negate, suppress header # 8..15: normal # 16..30: subtract 16, gzip header zlib.DEF_MEM_LEVEL, # mem level: 1..8/9 0 # strategy: # 0 = Z_DEFAULT_STRATEGY # 1 = Z_FILTERED # 2 = Z_HUFFMAN_ONLY # 3 = Z_RLE # 4 = Z_FIXED ) deflated = compress.compress(data) deflated += compress.flush() return deflated def inflate(data): decompress = zlib.decompressobj( -zlib.MAX_WBITS # see above ) inflated = decompress.decompress(data) inflated += decompress.flush() return inflated </code></pre> <p>I don't know if this corresponds exactly to whatever your server requires, but those two functions are able to round-trip any data I tried.</p> <p>The parameters maps directly to what is passed to the zlib library functions.</p> <p><strong>Python</strong> ⇒ <strong>C</strong><br> <code>zlib.compressobj(...)</code> ⇒ <code>deflateInit(...)</code><br> <code>compressobj.compress(...)</code> ⇒ <code>deflate(...)</code><br> <code>zlib.decompressobj(...)</code> ⇒ <code>inflateInit(...)</code><br> <code>decompressobj.decompress(...)</code> ⇒ <code>inflate(...)</code></p> <p>The constructors create the structure and populate it with default values, and pass it along to the init-functions. The <code>compress</code>/<code>decompress</code> methods update the structure and pass it to <code>inflate</code>/<code>deflate</code>.</p>

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