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/*
* Copyright 2017 The Native Object Protocols Authors
*
* 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 LIBNOP_INLCUDE_NOP_UTILITY_STREAM_READER_H_
#define LIBNOP_INLCUDE_NOP_UTILITY_STREAM_READER_H_
#include <cstdint>
#include <istream>
#include <nop/status.h>
namespace nop {
//
// Reader template type that wraps STL input streams.
//
// Implements the basic reader interface on top of an STL input stream type.
//
template <typename IStream>
class StreamReader {
public:
template <typename... Args>
StreamReader(Args&&... args) : stream_{std::forward<Args>(args)...} {}
StreamReader(const StreamReader&) = default;
StreamReader& operator=(const StreamReader&) = default;
Status<void> Ensure(std::size_t /*size*/) { return {}; }
Status<void> Read(std::uint8_t* byte) {
using CharType = typename IStream::char_type;
stream_.read(reinterpret_cast<CharType*>(byte), sizeof(std::uint8_t));
return ReturnStatus();
}
Status<void> Read(void* begin, void* end) {
using CharType = typename IStream::char_type;
CharType* begin_char = static_cast<CharType*>(begin);
CharType* end_char = static_cast<CharType*>(end);
const std::size_t length_bytes = std::distance(begin_char, end_char);
stream_.read(begin_char, length_bytes);
return ReturnStatus();
}
Status<void> Skip(std::size_t padding_bytes) {
stream_.seekg(padding_bytes, std::ios_base::cur);
return ReturnStatus();
}
const IStream& stream() const { return stream_; }
IStream& stream() { return stream_; }
IStream&& take() { return std::move(stream_); }
private:
Status<void> ReturnStatus() {
if (stream_.bad() || stream_.eof())
return ErrorStatus::StreamError;
else
return {};
}
IStream stream_;
};
} // namespace nop
#endif // LIBNOP_INLCUDE_NOP_UTILITY_STREAM_READER_H_
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