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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/hpack|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == hpack [[toc:]] === Description A HTTP/2 header compression library for Chicken. === Current status In its current form, the library correctly encodes and decodes HTTP2 headers. It implements Huffman encoding/decoding, indexed and literal header representations, header-tables etc. However, performance and error-handling need to be improved before production use. === Author Omar Shorbaji === Requirements defstruct === API <procedure> (make-hpack-decoder) </procedure> returns a function that accepts a string and returns a list of headers decoded. <procedure>(make-hpack-encoder)</procedure> returns a function that accepts a list of headers and returns an HPACK string. The function takes an optional argument telling it whether to index headers when possible or not. Note that a header is a pair of a symbol and a string <procedure> (make-header-table #!optional (size: 4096) </procedure> creates a header table for an encoder/decoder <procedure> (hpack-encode header-table headers #!optional (index-headers? #t))</procedure> <procedure> (hpack-decode header-table code)</procedure> Encode decode procedures using a header-table === Examples <enscript highlight="scheme"> (define encode (make-hpack-encoder)) (define headers '((:authority . "127.0.0.1") (:method . "GET") (:scheme . "http") (:path . "/") (foo . "bar"))) (encode headers) ;=> "A�\b�\\\v�p����@���\x03bar" (encode headers index: #f) ;.=> "\x11�\b�\\\v�p����\x10���\x03bar" (define (decode (make-hpack-decoder))) (decode (encode headers)) ;=> ((:authority . "127.0.0.1") ; (:method . "GET") ; (:scheme . "http") ; (:path . "/") ; (foo . "bar")) </enscript> === Repository [[https://github.com/shorbaji/hpack]] === License ;; Copyright (c) 2014, Omar Shorbaji ;; All rights reserved. ;; ;; Redistribution and use in source and binary forms, with or without ;; modification, are permitted provided that the following conditions are met: ;; ;; Redistributions of source code must retain the above copyright notice, this ;; list of conditions and the following disclaimer. ;; Redistributions in binary form must reproduce the above copyright notice, ;; this list of conditions and the following disclaimer in the documentation ;; and/or other materials provided with the distribution. ;; Neither the name of the author nor the names of its contributors may be ;; used to endorse or promote products derived from this software without ;; specific prior written permission. ;; ;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" ;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE ;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR ;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OFcl ;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS ;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN ;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ;; POSSIBILITY OF SUCH DAMAGE. === Version History 0.1 alpha release 0.2 updated api to include hpack-encode, hpack-decode and make-header-table Description of your changes:

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