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128 lines
4 KiB
C++
128 lines
4 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
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//
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// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
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//
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// Licensed under the MIT License (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://opensource.org/licenses/MIT
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//
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#ifndef RAPIDJSON_ISTREAMWRAPPER_H_
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#define RAPIDJSON_ISTREAMWRAPPER_H_
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#include "stream.h"
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#include <iosfwd>
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#include <ios>
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#ifdef __clang__
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(padded)
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#elif defined(_MSC_VER)
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(4351) // new behavior: elements of array 'array' will be default initialized
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#endif
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RAPIDJSON_NAMESPACE_BEGIN
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//! Wrapper of \c std::basic_istream into RapidJSON's Stream concept.
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/*!
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The classes can be wrapped including but not limited to:
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- \c std::istringstream
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- \c std::stringstream
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- \c std::wistringstream
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- \c std::wstringstream
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- \c std::ifstream
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- \c std::fstream
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- \c std::wifstream
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- \c std::wfstream
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\tparam StreamType Class derived from \c std::basic_istream.
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*/
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template <typename StreamType>
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class BasicIStreamWrapper {
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public:
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typedef typename StreamType::char_type Ch;
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//! Constructor.
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/*!
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\param stream stream opened for read.
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*/
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BasicIStreamWrapper(StreamType &stream) : stream_(stream), buffer_(peekBuffer_), bufferSize_(4), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
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Read();
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}
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//! Constructor.
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/*!
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\param stream stream opened for read.
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\param buffer user-supplied buffer.
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\param bufferSize size of buffer in bytes. Must >=4 bytes.
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*/
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BasicIStreamWrapper(StreamType &stream, char* buffer, size_t bufferSize) : stream_(stream), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
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RAPIDJSON_ASSERT(bufferSize >= 4);
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Read();
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}
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Ch Peek() const { return *current_; }
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Ch Take() { Ch c = *current_; Read(); return c; }
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size_t Tell() const { return count_ + static_cast<size_t>(current_ - buffer_); }
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// Not implemented
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void Put(Ch) { RAPIDJSON_ASSERT(false); }
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void Flush() { RAPIDJSON_ASSERT(false); }
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Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
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// For encoding detection only.
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const Ch* Peek4() const {
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return (current_ + 4 - !eof_ <= bufferLast_) ? current_ : 0;
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}
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private:
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BasicIStreamWrapper();
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BasicIStreamWrapper(const BasicIStreamWrapper&);
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BasicIStreamWrapper& operator=(const BasicIStreamWrapper&);
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void Read() {
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if (current_ < bufferLast_)
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++current_;
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else if (!eof_) {
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count_ += readCount_;
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readCount_ = bufferSize_;
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bufferLast_ = buffer_ + readCount_ - 1;
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current_ = buffer_;
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if (!stream_.read(buffer_, static_cast<std::streamsize>(bufferSize_))) {
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readCount_ = static_cast<size_t>(stream_.gcount());
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*(bufferLast_ = buffer_ + readCount_) = '\0';
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eof_ = true;
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}
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}
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}
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StreamType &stream_;
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Ch peekBuffer_[4], *buffer_;
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size_t bufferSize_;
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Ch *bufferLast_;
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Ch *current_;
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size_t readCount_;
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size_t count_; //!< Number of characters read
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bool eof_;
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};
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typedef BasicIStreamWrapper<std::istream> IStreamWrapper;
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typedef BasicIStreamWrapper<std::wistream> WIStreamWrapper;
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#if defined(__clang__) || defined(_MSC_VER)
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RAPIDJSON_DIAG_POP
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#endif
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RAPIDJSON_NAMESPACE_END
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#endif // RAPIDJSON_ISTREAMWRAPPER_H_
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