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// Copyright 2016 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.
#ifndef BLIMP_NET_COMPRESSED_PACKET_READER_H_
#define BLIMP_NET_COMPRESSED_PACKET_READER_H_
#include "base/memory/weak_ptr.h"
#include "blimp/net/blimp_net_export.h"
#include "blimp/net/packet_reader.h"
#include "net/base/completion_callback.h"
#include "net/base/io_buffer.h"
#include "third_party/zlib/zlib.h"
namespace blimp {
// Filter object which wraps a PacketReader, adding a DEFLATE decompression step
// to received packets.
// Details about the encoding format are available in the CompressedPacketWriter
// header.
class BLIMP_NET_EXPORT CompressedPacketReader : public PacketReader {
public:
// |source|: The source which from which compressed packets are read.
explicit CompressedPacketReader(std::unique_ptr<PacketReader> source);
~CompressedPacketReader() override;
// PacketReader implementation.
void ReadPacket(const scoped_refptr<net::GrowableIOBuffer>& decompressed_buf,
const net::CompletionCallback& cb) override;
private:
// Called when source->ReadPacket() has completed.
// |buf|: The buffer which will receive decompressed data.
// |cb|: Callback which is triggered after decompression has finished.
// |result|: The result of the read operation.
void OnCompressedPacketReceived(
const scoped_refptr<net::GrowableIOBuffer> decompressed_buf,
const net::CompletionCallback& cb,
int result);
// Decompresses the contents of |compressed_buf_| to the buffer
// |decompressed|.
// |decompressed_size| is set to the size of the decompressed payload.
// On success, returns a >= 0 value indicating the size of the
// decompressed payload.
// On failure, returns a negative value indicating the error code
// (see net_errors.h).
int DecompressPacket(const scoped_refptr<net::GrowableIOBuffer>& decompressed,
int size);
std::unique_ptr<PacketReader> source_;
scoped_refptr<net::GrowableIOBuffer> compressed_buf_;
z_stream zlib_stream_;
// Used to abandon pending ReadPacket() calls on teardown.
base::WeakPtrFactory<CompressedPacketReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(CompressedPacketReader);
};
} // namespace blimp
#endif // BLIMP_NET_COMPRESSED_PACKET_READER_H_
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