I thought they were the same thing ? Checkout http://www.zlib.net/ notice the Authors credited and the authors of Gzip http://www.gzip.org/ and deflate methods.
Alternatively you can use the BIO implementation for doing compression as a template to write your own compression by bolting in any library of your choosing.
Doug Kehn wrote:
Can BIO_f_zlib() be used to compress/uncompress gzip format or is it limited to deflate?
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