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//
// Copyright (C) 2020 The Android Open Source Project
//
// 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.
//
#pragma once
#include <libsnapshot/cow_reader.h>
namespace android {
namespace snapshot {
class IByteStream {
public:
virtual ~IByteStream() {}
// Read up to |length| bytes, storing the number of bytes read in the out-
// parameter. If the end of the stream is reached, 0 is returned.
virtual bool Read(void* buffer, size_t length, size_t* read) = 0;
// Size of the stream.
virtual size_t Size() const = 0;
};
class IDecompressor {
public:
virtual ~IDecompressor() {}
// Factory methods for decompression methods.
static std::unique_ptr<IDecompressor> Uncompressed();
static std::unique_ptr<IDecompressor> Gz();
static std::unique_ptr<IDecompressor> Brotli();
// |output_bytes| is the expected total number of bytes to sink.
virtual bool Decompress(size_t output_bytes) = 0;
void set_stream(IByteStream* stream) { stream_ = stream; }
void set_sink(IByteSink* sink) { sink_ = sink; }
protected:
IByteStream* stream_ = nullptr;
IByteSink* sink_ = nullptr;
};
} // namespace snapshot
} // namespace android
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