Update Crashpad to 4a2043ea65e2641ef1a921801c0aaa15ada02fc7

third_party/crashpad/crashpad/util/net/http_body_gzip.cc

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