68 lines
2.8 KiB
C
68 lines
2.8 KiB
C
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// Copyright (C) 2011 Milo Yip
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef RAPIDJSON_MEMORYSTREAM_H_
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#define RAPIDJSON_MEMORYSTREAM_H_
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#include "rapidjson.h"
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namespace rapidjson {
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//! Represents an in-memory input byte stream.
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/*!
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This class is mainly for being wrapped by EncodedInputStream or AutoUTFInputStream.
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It is similar to FileReadBuffer but the source is an in-memory buffer instead of a file.
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Differences between MemoryStream and StringStream:
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1. StringStream has encoding but MemoryStream is a byte stream.
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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.
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3. MemoryStream supports Peek4() for encoding detection. StringStream is specified with an encoding so it should not have Peek4().
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\note implements Stream concept
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*/
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struct MemoryStream {
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typedef char Ch; // byte
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MemoryStream(const Ch *src, size_t size) : src_(src), begin_(src), end_(src + size), size_(size) {}
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Ch Peek() const { return *src_; }
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Ch Take() { return (src_ == end_) ? '\0' : *src_++; }
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size_t Tell() const { return static_cast<size_t>(src_ - begin_); }
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Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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void Put(Ch) { RAPIDJSON_ASSERT(false); }
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void Flush() { RAPIDJSON_ASSERT(false); }
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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 Tell() + 4 <= size_ ? src_ : 0;
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}
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const Ch* src_; //!< Current read position.
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const Ch* begin_; //!< Original head of the string.
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const Ch* end_; //!< End of stream.
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size_t size_; //!< Size of the stream.
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};
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} // namespace rapidjson
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#endif // RAPIDJSON_MEMORYBUFFER_H_
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