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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "blimp/net/compressed_packet_reader.h"
#include <iostream>
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/sys_byteorder.h"
#include "blimp/net/common.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/socket/stream_socket.h"
namespace blimp {
CompressedPacketReader::CompressedPacketReader(
std::unique_ptr<PacketReader> source)
: source_(std::move(source)),
compressed_buf_(new net::GrowableIOBuffer),
weak_factory_(this) {
DCHECK(source_);
memset(&zlib_stream_, 0, sizeof(z_stream));
// MAX_WBITS means we are using the maximal window size for decompression;
// a negative value means that we are ignoring headers and CRC checks.
int init_result = inflateInit2(&zlib_stream_, -MAX_WBITS);
DCHECK_EQ(Z_OK, init_result);
}
CompressedPacketReader::~CompressedPacketReader() {
inflateEnd(&zlib_stream_);
}
void CompressedPacketReader::ReadPacket(
const scoped_refptr<net::GrowableIOBuffer>& decompressed_buf,
const net::CompletionCallback& callback) {
DCHECK(decompressed_buf);
DCHECK(!callback.is_null());
source_->ReadPacket(
compressed_buf_,
base::Bind(&CompressedPacketReader::OnCompressedPacketReceived,
weak_factory_.GetWeakPtr(), decompressed_buf, callback));
}
void CompressedPacketReader::OnCompressedPacketReceived(
const scoped_refptr<net::GrowableIOBuffer> decompressed_buf,
const net::CompletionCallback& callback,
int result) {
if (result <= 0) {
callback.Run(result);
return;
}
callback.Run(DecompressPacket(decompressed_buf, result));
}
int CompressedPacketReader::DecompressPacket(
const scoped_refptr<net::GrowableIOBuffer>& decompressed,
int size) {
compressed_buf_->set_offset(0);
decompressed->set_offset(0);
if (static_cast<size_t>(decompressed->capacity()) <
kMaxPacketPayloadSizeBytes) {
decompressed->SetCapacity(kMaxPacketPayloadSizeBytes);
}
zlib_stream_.next_in = reinterpret_cast<uint8_t*>(compressed_buf_->data());
zlib_stream_.avail_in = base::checked_cast<uint32_t>(size);
zlib_stream_.next_out = reinterpret_cast<uint8_t*>(decompressed->data());
zlib_stream_.avail_out = decompressed->RemainingCapacity();
int inflate_result = inflate(&zlib_stream_, Z_SYNC_FLUSH);
if (inflate_result != Z_OK) {
DLOG(ERROR) << "inflate() returned unexpected error code: "
<< inflate_result;
return net::ERR_UNEXPECTED;
}
DCHECK_GT(decompressed->RemainingCapacity(),
base::checked_cast<int>(zlib_stream_.avail_out));
int decompressed_size =
decompressed->RemainingCapacity() - zlib_stream_.avail_out;
// Verify that the decompressed output isn't bigger than the maximum allowable
// payload size, by checking if there are bytes waiting to be processed.
if (zlib_stream_.avail_in > 0) {
DLOG(ERROR)
<< "Decompressed buffer size exceeds allowable limits; aborting.";
return net::ERR_FILE_TOO_BIG;
}
return decompressed_size;
}
} // namespace blimp
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