Struct MemoryStream

Synopsis

#include <include/rapidjson/memorystream.h>

struct MemoryStream

Description

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

Methods

MemoryStream
Flush
Peek
Peek4
Put
PutBegin
PutEnd
Take
Tell

Source

Lines 40-63 in include/rapidjson/memorystream.h.

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.
};





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