127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/net/http_body_gzip.h"
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#include <utility>
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#include "base/logging.h"
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#include "base/numerics/safe_conversions.h"
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#include "third_party/zlib/zlib_crashpad.h"
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#include "util/misc/zlib.h"
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namespace crashpad {
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GzipHTTPBodyStream::GzipHTTPBodyStream(std::unique_ptr<HTTPBodyStream> source)
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: input_(),
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source_(std::move(source)),
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z_stream_(new z_stream()),
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state_(State::kUninitialized) {}
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GzipHTTPBodyStream::~GzipHTTPBodyStream() {
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DCHECK(state_ == State::kUninitialized ||
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state_ == State::kFinished ||
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state_ == State::kError);
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}
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FileOperationResult GzipHTTPBodyStream::GetBytesBuffer(uint8_t* buffer,
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size_t max_len) {
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if (state_ == State::kError) {
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return -1;
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}
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if (state_ == State::kFinished) {
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return 0;
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}
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if (state_ == State::kUninitialized) {
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z_stream_->zalloc = Z_NULL;
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z_stream_->zfree = Z_NULL;
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z_stream_->opaque = Z_NULL;
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// The default values for zlib’s internal MAX_WBITS and DEF_MEM_LEVEL. These
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// are the values that deflateInit() would use, but they’re not exported
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// from zlib. deflateInit2() is used instead of deflateInit() to get the
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// gzip wrapper.
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constexpr int kZlibMaxWindowBits = 15;
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constexpr int kZlibDefaultMemoryLevel = 8;
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int zr = deflateInit2(z_stream_.get(),
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Z_DEFAULT_COMPRESSION,
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Z_DEFLATED,
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ZlibWindowBitsWithGzipWrapper(kZlibMaxWindowBits),
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kZlibDefaultMemoryLevel,
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Z_DEFAULT_STRATEGY);
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if (zr != Z_OK) {
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LOG(ERROR) << "deflateInit2: " << ZlibErrorString(zr);
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state_ = State::kError;
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return -1;
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}
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state_ = State::kOperating;
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}
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z_stream_->next_out = buffer;
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z_stream_->avail_out = base::saturated_cast<uInt>(max_len);
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while (state_ != State::kFinished && z_stream_->avail_out > 0) {
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if (state_ != State::kInputEOF && z_stream_->avail_in == 0) {
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FileOperationResult input_bytes =
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source_->GetBytesBuffer(input_, sizeof(input_));
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if (input_bytes == -1) {
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Done(State::kError);
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return -1;
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}
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if (input_bytes == 0) {
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state_ = State::kInputEOF;
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}
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z_stream_->next_in = input_;
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z_stream_->avail_in = base::checked_cast<uInt>(input_bytes);
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}
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int zr = deflate(z_stream_.get(),
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state_ == State::kInputEOF ? Z_FINISH : Z_NO_FLUSH);
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if (state_ == State::kInputEOF && zr == Z_STREAM_END) {
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Done(State::kFinished);
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if (state_ == State::kError) {
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return -1;
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}
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} else if (zr != Z_OK) {
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LOG(ERROR) << "deflate: " << ZlibErrorString(zr);
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Done(State::kError);
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return -1;
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}
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}
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DCHECK_LE(z_stream_->avail_out, max_len);
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return max_len - z_stream_->avail_out;
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}
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void GzipHTTPBodyStream::Done(State state) {
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DCHECK(state_ == State::kOperating || state_ == State::kInputEOF) << state_;
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DCHECK(state == State::kFinished || state == State::kError) << state;
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int zr = deflateEnd(z_stream_.get());
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if (zr != Z_OK) {
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LOG(ERROR) << "deflateEnd: " << ZlibErrorString(zr);
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state_ = State::kError;
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} else {
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state_ = state;
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}
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}
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} // namespace crashpad
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