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/*
* Copyright (C) 2017 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 <cstdint>
#include <string>
#include <android/util/EncodedBuffer.h>
namespace android {
namespace util {
/**
* A ProtoReader on top of a file descriptor.
*/
class ProtoFileReader : public ProtoReader
{
public:
/**
* Read from this file descriptor.
*/
ProtoFileReader(int fd);
/**
* Does NOT close the file.
*/
virtual ~ProtoFileReader();
// From ProtoReader.
virtual ssize_t size() const;
virtual size_t bytesRead() const;
virtual uint8_t const* readBuffer();
virtual size_t currentToRead();
virtual bool hasNext();
virtual uint8_t next();
virtual uint64_t readRawVarint();
virtual void move(size_t amt);
status_t getError() const;
private:
int mFd; // File descriptor for input.
status_t mStatus; // Any errors encountered during read.
ssize_t mSize; // How much total data there is, or -1 if we can't tell.
size_t mPos; // How much data has been read so far.
size_t mOffset; // Offset in current buffer.
size_t mMaxOffset; // How much data is left to read in mBuffer.
const int mChunkSize; // Size of mBuffer.
uint8_t mBuffer[32*1024];
/**
* If there is currently more data to read in the buffer, returns true.
* If there is not more, then tries to read. If more data can be read,
* it does so and returns true. If there is no more data, returns false.
* Resets mOffset and mMaxOffset as necessary. Does not advance mOffset.
*/
bool ensure_data();
};
}
}
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