| // Copyright (C) 2011 Milo Yip |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| #ifndef RAPIDJSON_MEMORYSTREAM_H_ |
| #define RAPIDJSON_MEMORYSTREAM_H_ |
| |
| #include "rapidjson.h" |
| |
| 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 (src_ == end_) ? '\0' : *src_; } |
| Ch Take() { return (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 |
| |
| #endif // RAPIDJSON_MEMORYBUFFER_H_ |