80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
/* Copyright 2019-2020 Canaan Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <iostream>
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#include <xtl/xspan.hpp>
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namespace nncase
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{
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namespace runtime
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{
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class binary_reader
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{
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public:
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binary_reader(std::istream &stream)
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: stream_(stream)
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{
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}
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template <class T>
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T read()
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{
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T value;
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read(value);
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return value;
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}
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template <class T>
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void read(T &value)
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{
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stream_.read(reinterpret_cast<char *>(&value), sizeof(value));
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}
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template <class T>
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void read_array(xtl::span<T> value)
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{
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stream_.read(reinterpret_cast<char *>(value.data()), value.size_bytes());
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}
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std::streampos position() const
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{
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return stream_.tellg();
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}
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void position(std::streampos pos)
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{
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stream_.seekg(pos);
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}
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void skip(std::streamoff off)
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{
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stream_.seekg(off, std::ios::cur);
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}
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size_t avail()
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{
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auto pos = stream_.tellg();
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stream_.seekg(0, std::ios::end);
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auto end = stream_.tellg();
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stream_.seekg(pos);
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return size_t(end - pos);
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}
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private:
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std::istream &stream_;
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};
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}
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}
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