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/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2014 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* !HAVE_CONFIG_H */
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#include <stdio.h>
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#include <string.h>
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#include <nghttp2/nghttp2.h>
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#define MAKE_NV(K, V) \
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{ \
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(uint8_t *)K, (uint8_t *)V, sizeof(K) - 1, sizeof(V) - 1, \
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NGHTTP2_NV_FLAG_NONE \
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}
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static void deflate(nghttp2_hd_deflater *deflater,
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nghttp2_hd_inflater *inflater, const nghttp2_nv *const nva,
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size_t nvlen);
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static int inflate_header_block(nghttp2_hd_inflater *inflater, uint8_t *in,
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size_t inlen, int final);
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int main() {
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int rv;
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nghttp2_hd_deflater *deflater;
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nghttp2_hd_inflater *inflater;
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/* Define 1st header set. This is looks like a HTTP request. */
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nghttp2_nv nva1[] = {
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MAKE_NV(":scheme", "https"), MAKE_NV(":authority", "example.org"),
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MAKE_NV(":path", "/"), MAKE_NV("user-agent", "libnghttp2"),
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MAKE_NV("accept-encoding", "gzip, deflate")};
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/* Define 2nd header set */
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nghttp2_nv nva2[] = {MAKE_NV(":scheme", "https"),
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MAKE_NV(":authority", "example.org"),
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MAKE_NV(":path", "/stylesheet/style.css"),
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MAKE_NV("user-agent", "libnghttp2"),
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MAKE_NV("accept-encoding", "gzip, deflate"),
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MAKE_NV("referer", "https://example.org")};
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rv = nghttp2_hd_deflate_new(&deflater, 4096);
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if (rv != 0) {
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fprintf(stderr, "nghttp2_hd_deflate_init failed with error: %s\n",
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nghttp2_strerror(rv));
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exit(EXIT_FAILURE);
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}
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rv = nghttp2_hd_inflate_new(&inflater);
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if (rv != 0) {
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fprintf(stderr, "nghttp2_hd_inflate_init failed with error: %s\n",
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nghttp2_strerror(rv));
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exit(EXIT_FAILURE);
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}
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/* Encode and decode 1st header set */
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deflate(deflater, inflater, nva1, sizeof(nva1) / sizeof(nva1[0]));
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/* Encode and decode 2nd header set, using differential encoding
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using state after encoding 1st header set. */
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deflate(deflater, inflater, nva2, sizeof(nva2) / sizeof(nva2[0]));
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nghttp2_hd_inflate_del(inflater);
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nghttp2_hd_deflate_del(deflater);
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return 0;
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}
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static void deflate(nghttp2_hd_deflater *deflater,
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nghttp2_hd_inflater *inflater, const nghttp2_nv *const nva,
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size_t nvlen) {
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ssize_t rv;
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uint8_t *buf;
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size_t buflen;
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size_t outlen;
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size_t i;
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size_t sum;
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sum = 0;
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for (i = 0; i < nvlen; ++i) {
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sum += nva[i].namelen + nva[i].valuelen;
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}
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printf("Input (%zu byte(s)):\n\n", sum);
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for (i = 0; i < nvlen; ++i) {
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fwrite(nva[i].name, 1, nva[i].namelen, stdout);
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printf(": ");
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fwrite(nva[i].value, 1, nva[i].valuelen, stdout);
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printf("\n");
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}
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buflen = nghttp2_hd_deflate_bound(deflater, nva, nvlen);
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buf = malloc(buflen);
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rv = nghttp2_hd_deflate_hd(deflater, buf, buflen, nva, nvlen);
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if (rv < 0) {
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fprintf(stderr, "nghttp2_hd_deflate_hd() failed with error: %s\n",
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nghttp2_strerror((int)rv));
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free(buf);
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exit(EXIT_FAILURE);
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}
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outlen = (size_t)rv;
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printf("\nDeflate (%zu byte(s), ratio %.02f):\n\n", outlen,
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sum == 0 ? 0 : (double)outlen / (double)sum);
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for (i = 0; i < outlen; ++i) {
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if ((i & 0x0fu) == 0) {
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printf("%08zX: ", i);
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}
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printf("%02X ", buf[i]);
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if (((i + 1) & 0x0fu) == 0) {
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printf("\n");
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}
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}
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printf("\n\nInflate:\n\n");
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/* We pass 1 to final parameter, because buf contains whole deflated
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header data. */
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rv = inflate_header_block(inflater, buf, outlen, 1);
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if (rv != 0) {
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free(buf);
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exit(EXIT_FAILURE);
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}
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printf("\n-----------------------------------------------------------"
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"--------------------\n");
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free(buf);
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}
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int inflate_header_block(nghttp2_hd_inflater *inflater, uint8_t *in,
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size_t inlen, int final) {
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ssize_t rv;
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for (;;) {
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nghttp2_nv nv;
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int inflate_flags = 0;
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size_t proclen;
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rv = nghttp2_hd_inflate_hd(inflater, &nv, &inflate_flags, in, inlen, final);
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if (rv < 0) {
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fprintf(stderr, "inflate failed with error code %zd", rv);
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return -1;
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}
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proclen = (size_t)rv;
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in += proclen;
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inlen -= proclen;
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if (inflate_flags & NGHTTP2_HD_INFLATE_EMIT) {
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fwrite(nv.name, 1, nv.namelen, stderr);
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fprintf(stderr, ": ");
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fwrite(nv.value, 1, nv.valuelen, stderr);
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fprintf(stderr, "\n");
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}
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if (inflate_flags & NGHTTP2_HD_INFLATE_FINAL) {
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nghttp2_hd_inflate_end_headers(inflater);
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break;
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}
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if ((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 && inlen == 0) {
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break;
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}
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}
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return 0;
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}
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