// Tencent is pleased to support the open source community by making RapidJSON available. // // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. // // Licensed under the MIT License (the "License"); you may not use this file except // in compliance with the License. You may obtain a copy of the License at // // http://opensource.org/licenses/MIT // // 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 RAPIDJSON_MEMORYSTREAM_H_ #define RAPIDJSON_MEMORYSTREAM_H_ #include "stream.h" #ifdef __clang__ RAPIDJSON_DIAG_PUSH RAPIDJSON_DIAG_OFF(unreachable-code) RAPIDJSON_DIAG_OFF(missing-noreturn) #endif RAPIDJSON_NAMESPACE_BEGIN //! Represents an in-memory input byte stream. /*! This class is mainly for being wrapped by EncodedInputStream or AutoUTFInputStream. It is similar to FileReadBuffer but the source is an in-memory buffer instead of a file. Differences between MemoryStream and StringStream: 1. StringStream has encoding but MemoryStream is a byte stream. 2. MemoryStream needs size of the source buffer and the buffer don't need to be null terminated. StringStream assume null-terminated string as source. 3. MemoryStream supports Peek4() for encoding detection. StringStream is specified with an encoding so it should not have Peek4(). \note implements Stream concept */ struct MemoryStream { typedef char Ch; // byte MemoryStream(const Ch *src, size_t size) : src_(src), begin_(src), end_(src + size), size_(size) {} Ch Peek() const { return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_; } Ch Take() { return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_++; } size_t Tell() const { return static_cast<size_t>(src_ - begin_); } Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; } void Put(Ch) { RAPIDJSON_ASSERT(false); } void Flush() { RAPIDJSON_ASSERT(false); } size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; } // For encoding detection only. const Ch* Peek4() const { return Tell() + 4 <= size_ ? src_ : 0; } const Ch* src_; //!< Current read position. const Ch* begin_; //!< Original head of the string. const Ch* end_; //!< End of stream. size_t size_; //!< Size of the stream. }; RAPIDJSON_NAMESPACE_END #ifdef __clang__ RAPIDJSON_DIAG_POP #endif #endif // RAPIDJSON_MEMORYBUFFER_H_