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/*
* Copyright (c) 2016 DeNA Co., Ltd., Kazuho Oku
*
* 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 <cassert>
#include <cstdlib>
#include <vector>
#include <zlib.h>
#include "h2o.h"
#include "encode.h"
namespace {
class brotli_context : public h2o_compress_context_t {
protected:
brotli::BrotliCompressor *brotli_;
brotli::BrotliParams params_;
std::vector<h2o_iovec_t> bufs_; // all bufs_[nnn].base must be free(3)ed
public:
brotli_context(int quality, size_t estimated_content_length) : brotli_(NULL) {
name = h2o_iovec_init(H2O_STRLIT("br"));
transform = _compress;
params_.quality = quality;
if (estimated_content_length != std::numeric_limits<size_t>::max())
_update_lgwin(params_, estimated_content_length);
}
~brotli_context() {
_clear_bufs();
delete brotli_;
}
static void dispose(void *_self) {
brotli_context *self = static_cast<brotli_context *>(_self);
self->~brotli_context();
}
private:
void _clear_bufs();
void _emit(bool is_last, bool force_flush);
void _compress(h2o_iovec_t *inbufs, size_t inbufcnt, int is_final, h2o_iovec_t **outbufs, size_t *outbufcnt);
static void _compress(h2o_compress_context_t *self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt) {
static_cast<brotli_context*>(self)->_compress(inbufs, inbufcnt, !h2o_send_state_is_in_progress(state), outbufs, outbufcnt);
}
static void _update_lgwin(brotli::BrotliParams ¶ms, size_t estimated_content_length);
};
}
void brotli_context::_clear_bufs()
{
for (std::vector<h2o_iovec_t>::iterator i = bufs_.begin(); i != bufs_.end(); ++i)
free(i->base);
bufs_.clear();
}
void brotli_context::_emit(bool is_last, bool force_flush)
{
uint8_t *output;
size_t out_size;
bool ret = brotli_->WriteBrotliData(is_last, force_flush, &out_size, &output);
assert(ret);
(void)ret;
if (out_size != 0)
bufs_.push_back(h2o_strdup(NULL, reinterpret_cast<const char *>(output), out_size));
}
void brotli_context::_compress(h2o_iovec_t *inbufs, size_t inbufcnt, int is_final, h2o_iovec_t **outbufs, size_t *outbufcnt)
{
if (brotli_ == NULL) {
if (is_final) {
uint64_t len = 0;
for (size_t i = 0; i != inbufcnt; ++i)
len += inbufs[i].len;
if (len < std::numeric_limits<size_t>::max())
_update_lgwin(params_, len);
}
brotli_ = new brotli::BrotliCompressor(params_);
}
_clear_bufs();
if (inbufcnt != 0) {
size_t inbufindex = 0, offset = 0, block_space = brotli_->input_block_size();
while (inbufindex != inbufcnt) {
size_t copy_len = std::min(block_space, inbufs[inbufindex].len - offset);
brotli_->CopyInputToRingBuffer(copy_len, reinterpret_cast<const uint8_t *>(inbufs[inbufindex].base) + offset);
offset += copy_len;
if (inbufs[inbufindex].len == offset) {
if (++inbufindex == inbufcnt)
break;
offset = 0;
}
if (block_space == 0) {
_emit(false, false);
block_space = brotli_->input_block_size();
}
}
_emit(is_final, !is_final);
} else {
if (is_final)
_emit(true, false);
}
if (is_final) {
delete brotli_;
brotli_ = NULL;
}
*outbufs = &bufs_.front();
*outbufcnt = bufs_.size();
}
void brotli_context::_update_lgwin(brotli::BrotliParams ¶ms, size_t estimated_content_length)
{
int bits = estimated_content_length > 1 ? sizeof(unsigned long long) * 8 - __builtin_clzll(estimated_content_length - 1) : 1;
if (bits < params.lgwin)
params.lgwin = std::max(bits, brotli::kMinWindowBits);
}
h2o_compress_context_t *h2o_compress_brotli_open(h2o_mem_pool_t *pool, int quality, size_t estimated_content_length)
{
brotli_context *ctx = static_cast<brotli_context *>(h2o_mem_alloc_shared(pool, sizeof(*ctx), brotli_context::dispose));
return new (ctx) brotli_context(quality, estimated_content_length);
}
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