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/*
* Copyright (C) 2021 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 <cerrno>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
#include "common.h"
#include "io_exception.h"
namespace screensharing {
// An input stream that uses the unsigned little endian base 128 (<a xref="https://en.wikipedia.org/wiki/LEB128">LEB128</a>)
// variable-length encoding for integer values.
// See Base128OutputStream.
class Base128InputStream {
public:
Base128InputStream(int fd, size_t buffer_size);
~Base128InputStream();
int Close();
uint8_t ReadByte();
int16_t ReadInt16();
uint16_t ReadUInt16() { return static_cast<uint16_t>(ReadInt16()); }
int32_t ReadInt32();
uint32_t ReadUInt32() { return static_cast<uint32_t>(ReadInt32()); }
int64_t ReadInt64();
uint64_t ReadUInt64() { return static_cast<uint64_t>(ReadInt64()); }
bool ReadBool();
std::unique_ptr<std::u16string> ReadString16();
class StreamFormatException : public IoException {
public:
StreamFormatException(const char* message)
: IoException(message) {
}
static StreamFormatException PrematureEndOfStream();
static StreamFormatException InvalidFormat();
};
private:
int fd_;
uint8_t* buffer_;
size_t buffer_capacity_;
size_t offset_;
size_t data_end_;
DISALLOW_COPY_AND_ASSIGN(Base128InputStream);
};
} // namespace screensharing
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