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/*
* nghttp3
*
* Copyright (c) 2019 nghttp3 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "qpack_encode.h"
#include <arpa/inet.h>
#include <cerrno>
#include <cstring>
#include <cassert>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <array>
#include <iomanip>
#include <vector>
#include "qpack.h"
#include "template.h"
#include "util.h"
namespace nghttp3 {
extern Config config;
Encoder::Encoder(size_t max_dtable_size, size_t max_blocked, bool immediate_ack)
: mem_(nghttp3_mem_default()),
enc_(nullptr),
max_dtable_size_(max_dtable_size),
max_blocked_(max_blocked),
immediate_ack_(immediate_ack) {}
Encoder::~Encoder() { nghttp3_qpack_encoder_del(enc_); }
int Encoder::init() {
int rv;
rv = nghttp3_qpack_encoder_new(&enc_, max_dtable_size_, mem_);
if (rv != 0) {
std::cerr << "nghttp3_qpack_encoder_new: " << nghttp3_strerror(rv)
<< std::endl;
return -1;
}
nghttp3_qpack_encoder_set_max_dtable_capacity(enc_, max_dtable_size_);
nghttp3_qpack_encoder_set_max_blocked_streams(enc_, max_blocked_);
return 0;
}
int Encoder::encode(nghttp3_buf *pbuf, nghttp3_buf *rbuf, nghttp3_buf *ebuf,
int64_t stream_id, const nghttp3_nv *nva, size_t len) {
auto rv =
nghttp3_qpack_encoder_encode(enc_, pbuf, rbuf, ebuf, stream_id, nva, len);
if (rv != 0) {
std::cerr << "nghttp3_qpack_encoder_encode: " << nghttp3_strerror(rv)
<< std::endl;
return -1;
}
if (immediate_ack_) {
nghttp3_qpack_encoder_ack_everything(enc_);
}
return 0;
}
namespace {
void write_encoder_stream(std::ostream &out, nghttp3_buf *ebuf) {
uint64_t stream_id = 0;
out.write(reinterpret_cast<char *>(&stream_id), sizeof(stream_id));
uint32_t size = htonl(nghttp3_buf_len(ebuf));
out.write(reinterpret_cast<char *>(&size), sizeof(size));
out.write(reinterpret_cast<char *>(ebuf->pos), nghttp3_buf_len(ebuf));
}
} // namespace
namespace {
void write_request_stream(std::ostream &out, int64_t stream_id,
nghttp3_buf *pbuf, nghttp3_buf *rbuf) {
stream_id = nghttp3_htonl64(stream_id);
out.write(reinterpret_cast<char *>(&stream_id), sizeof(stream_id));
uint32_t size = htonl(nghttp3_buf_len(pbuf) + nghttp3_buf_len(rbuf));
out.write(reinterpret_cast<char *>(&size), sizeof(size));
out.write(reinterpret_cast<char *>(pbuf->pos), nghttp3_buf_len(pbuf));
out.write(reinterpret_cast<char *>(rbuf->pos), nghttp3_buf_len(rbuf));
}
} // namespace
int encode(const std::string_view &outfile, const std::string_view &infile) {
auto in = std::ifstream(infile.data(), std::ios::binary);
if (!in) {
std::cerr << "Could not open file " << infile << ": " << strerror(errno)
<< std::endl;
return -1;
}
auto out = std::ofstream(outfile.data(), std::ios::trunc | std::ios::binary);
if (!out) {
std::cerr << "Could not open file " << outfile << ": " << strerror(errno)
<< std::endl;
return -1;
}
auto enc =
Encoder(config.max_dtable_size, config.max_blocked, config.immediate_ack);
if (enc.init() != 0) {
return -1;
}
nghttp3_buf pbuf, rbuf, ebuf;
nghttp3_buf_init(&pbuf);
nghttp3_buf_init(&rbuf);
nghttp3_buf_init(&ebuf);
auto mem = nghttp3_mem_default();
auto pbufd = defer(nghttp3_buf_free, &pbuf, mem);
auto rbufd = defer(nghttp3_buf_free, &rbuf, mem);
auto ebufd = defer(nghttp3_buf_free, &ebuf, mem);
int64_t stream_id = 1;
std::array<std::string, 1024> sarray;
size_t srclen = 0;
size_t enclen = 0;
size_t rslen = 0;
size_t eslen = 0;
for (; in;) {
auto nva = std::vector<nghttp3_nv>();
for (std::string line; std::getline(in, line);) {
if (line == "") {
break;
}
if (sarray.size() == nva.size()) {
std::cerr << "Too many headers: " << nva.size() << std::endl;
return -1;
}
sarray[nva.size()] = line;
const auto &s = sarray[nva.size()];
auto d = s.find('\t');
if (d == std::string_view::npos) {
std::cerr << "Could not find TAB in " << s << std::endl;
return -1;
}
auto name = std::string_view(s.c_str(), d);
auto value = std::string_view(s.c_str() + d + 1, s.size() - d - 1);
value.remove_prefix(std::min(value.find_first_not_of(" "), value.size()));
srclen += name.size() + value.size();
nva.emplace_back(nghttp3_nv{
const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(name.data())),
const_cast<uint8_t *>(
reinterpret_cast<const uint8_t *>(value.data())),
name.size(), value.size()});
}
if (nva.empty()) {
break;
}
if (auto rv =
enc.encode(&pbuf, &rbuf, &ebuf, stream_id, nva.data(), nva.size());
rv != 0) {
return -1;
}
enclen += nghttp3_buf_len(&pbuf) + nghttp3_buf_len(&rbuf) +
nghttp3_buf_len(&ebuf);
if (nghttp3_buf_len(&ebuf)) {
write_encoder_stream(out, &ebuf);
}
write_request_stream(out, stream_id, &pbuf, &rbuf);
rslen += nghttp3_buf_len(&pbuf) + nghttp3_buf_len(&rbuf);
eslen += nghttp3_buf_len(&ebuf);
nghttp3_buf_reset(&pbuf);
nghttp3_buf_reset(&rbuf);
nghttp3_buf_reset(&ebuf);
++stream_id;
}
if (srclen == 0) {
std::cerr << "No header field processed" << std::endl;
} else {
std::cerr << srclen << " -> " << enclen << " (r:" << rslen
<< " + e:" << eslen << ") " << std::fixed << std::setprecision(2)
<< (1. - (static_cast<double>(enclen) / srclen)) * 100
<< "% compressed" << std::endl;
}
return 0;
}
} // namespace nghttp3
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