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// Copyright 2018 Google Inc.
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef TINK_UTIL_ISTREAM_INPUT_STREAM_H_
#define TINK_UTIL_ISTREAM_INPUT_STREAM_H_
#include <stdint.h>
#include <istream>
#include <memory>
#include "tink/input_stream.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace util {
// An InputStream that reads from a std::istream.
class IstreamInputStream : public crypto::tink::InputStream {
public:
// Constructs an InputStream that will read from the 'input' istream,
// using a buffer of the specified size, if any (if no legal 'buffer_size'
// is given, a reasonable default will be used).
explicit IstreamInputStream(std::unique_ptr<std::istream> input,
int buffer_size = -1);
~IstreamInputStream() override;
crypto::tink::util::StatusOr<int> Next(const void** data) override;
void BackUp(int count) override;
int64_t Position() const override;
private:
util::Status status_;
std::unique_ptr<std::istream> input_;
std::unique_ptr<uint8_t[]> buffer_;
const int buffer_size_;
int64_t position_; // current position in the istream (from the beginning)
// Counters that describe the state of the data in buffer_.
int count_in_buffer_; // # of bytes available in buffer_
int count_backedup_; // # of bytes available in buffer_ that were backed up
int buffer_offset_; // offset at which the returned bytes start in buffer_
};
} // namespace util
} // namespace tink
} // namespace crypto
#endif // TINK_UTIL_ISTREAM_INPUT_STREAM_H_
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