memorystream.h
// Copyright (C) 2011 Milo Yip
//
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// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
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// 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
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// THE SOFTWARE.
#ifndef RAPIDJSON_MEMORYSTREAM_H_
#define RAPIDJSON_MEMORYSTREAM_H_
#include "rapidjson.h"
namespace rapidjson {
//! 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.
};
} // namespace rapidjson
#endif // RAPIDJSON_MEMORYBUFFER_H_
rapidjson::MemoryStream
Represents an in-memory input byte stream.
Definition: memorystream.h:40
rapidjson::MemoryStream::size_
size_t size_
Size of the stream.
Definition: memorystream.h:62
rapidjson::MemoryStream::end_
const Ch * end_
End of stream.
Definition: memorystream.h:61
rapidjson::MemoryStream::begin_
const Ch * begin_
Original head of the string.
Definition: memorystream.h:60
rapidjson
main RapidJSON namespace
Definition: rapidjson.h:241
rapidjson::MemoryStream::src_
const Ch * src_
Current read position.
Definition: memorystream.h:59
rapidjson.h
common definitions and configuration
RAPIDJSON_ASSERT
#define RAPIDJSON_ASSERT(x)
Assertion.
Definition: rapidjson.h:269