309 lines
8.9 KiB
C++
309 lines
8.9 KiB
C++
#pragma once
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/************************************************************************
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基于内存的数据包读写类
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实现方式与MemoryStream相同，写入数据的时候写入到内存中，如果写入数据的空间超出现有
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内存块长度则会自动增长内存。
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数据包的内存申请时通过内存池对象CBufferAllocator进行的，以使用更有效率的内存管理。
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★数据包中的字符串
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数据包含有一种字符串读写机制，包括ANSI字符串以及UNICODE16字符串。将一个字符串写入
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到数据包后其内存结构为：
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[2字节字符长度数据][字符串字节数据，字符串长度在65536以内][字符串终止字符0]
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************************************************************************/
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#include "ObjectCounter.h"
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#include "DataPacketReader.hpp"
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class CDataPacket : public CDataPacketReader, public Counter<CDataPacket>
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{
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public:
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/* 写入二进制数据
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* lpBuffer 指向二进制数据内存的指针
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* dwSize 数据的字节长度
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*/
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inline void writeBuf(LPCVOID lpBuffer, size_t dwSize)
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{
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size_t dwMemSize = m_pMemoryEnd - m_pOffset;
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if ( dwMemSize < dwSize )
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{
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setSize(m_pMemoryEnd - m_pMemory + dwSize);
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}
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memcpy(m_pOffset, lpBuffer, dwSize);
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m_pOffset += dwSize;
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//如果读写指针超过长度指针的位置，则调整长度指针为读写指针的位置
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if ( m_pOffset > m_pDataEnd )
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m_pDataEnd = m_pOffset;
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}
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/* 写入原子类型数据
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* bool,char,short,int,__int64,float,double,void*这些数据类型为原子类型
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*/
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template <typename T>
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inline void writeAtom(T data)
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{
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size_t dwMemSize = m_pMemoryEnd - m_pOffset;
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if ( dwMemSize < sizeof(data) )
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{
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setSize(m_pMemoryEnd - m_pMemory + sizeof(data));
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}
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*(T*)m_pOffset = data;
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m_pOffset += sizeof(data);
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//如果读写指针超过长度指针的位置，则调整长度指针为读写指针的位置
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if ( m_pOffset > m_pDataEnd )
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m_pDataEnd = m_pOffset;
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}
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inline void writeString(const char *str, size_t len = -1)
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{
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rawWriteStringLen<unsigned short>(str, len);
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}
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/* 写入UNICODE16字符串数据（字符串长度必须在65536以内，超过65535的部分将不会被写入）
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* 在字符串之前写入两个字节的字符串长度，且会再字符串末尾写入终止字符
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* len 如果值为-1，则自动计算str的长度
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*/
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inline void writeWideString(const wchar_t *str, size_t len = -1)
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{
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rawWriteWideStringLen<unsigned short>(str, len);
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}
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public:
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/* 设置数据包的数据长度
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* 如果设置的长度比当前长度小且读写偏移指针超过新的长度，则会将读写偏移指针调整到与新长度一致
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* 如果新的长度比当前的长度要则会自动扩展内存块大小
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*/
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inline void setLength(size_t newLength)
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{
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if ( newLength > (size_t)(m_pMemoryEnd - m_pMemory) )
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setSize(newLength);
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m_pDataEnd = m_pMemory + newLength;
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//如果调整数据长度后偏移位置超出长度位置，则调整偏移位置为长度位置
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if ( m_pOffset > m_pDataEnd )
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m_pOffset = m_pDataEnd;
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}
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/* 设置数据包当前读写位置字节偏移量，
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* 如果新的偏移量比当前内存块长度要大，则函数会与setLength一样进行内存块的扩展操作
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*/
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inline size_t setPosition(size_t newPos)
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{
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size_t dwMemSize = m_pMemoryEnd - m_pMemory;
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if ( newPos > dwMemSize )
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setSize(newPos);
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m_pOffset = m_pMemory + newPos;
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//如果读写指针超过长度指针的位置，则调整长度指针为读写指针的位置
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if ( m_pOffset > m_pDataEnd )
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m_pDataEnd = m_pOffset;
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return newPos;
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}
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/* 基于当前读写指针偏移位置调整偏移量
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* nOffsetToAdjust 要调整的偏移量大小，负数则表示向内存开始处调整（降低偏移）
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* 函数内会限制调整后的偏移位置必须大于等于内存开头，
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* 如果调整后的便宜超过现有内存长度，则会自动增长内存到欲求调整的位置
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*/
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inline size_t adjustOffset(INT64 nOffsetToAdjust)
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{
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m_pOffset += nOffsetToAdjust;
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if ( m_pOffset < m_pMemory )
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m_pOffset = m_pMemory;
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else if ( m_pOffset > m_pMemoryEnd )
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setSize(m_pOffset - m_pMemory);
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if ( m_pOffset > m_pDataEnd )
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m_pDataEnd = m_pOffset;
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return m_pOffset - m_pMemory;
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}
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/*
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* 扩展内存缓存区长度
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*/
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inline size_t reserve(size_t nSize)
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{
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size_t Result = m_pMemoryEnd - m_pMemory;
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if ( Result < nSize )
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setSize(nSize);
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return Result;
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}
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/*
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* 获取当前缓冲长度下的可用字节数
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*/
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inline size_t getAvaliableCapacity()
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{
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return m_pMemoryEnd - m_pOffset;
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}
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//获取当前占有的内存的物理长度
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inline size_t getMemorySize()
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{
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return m_pMemoryEnd - m_pMemory;
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}
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public:
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/*
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* Comment: 适用于在通过开启预定义宏_DPPACK_MEM_CHK_的情况下，对数据包进行内存越界检查
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* @Return void:
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*/
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inline void _Assert()
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{
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#ifdef _DPPACK_MEM_CHK_
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DbgAssert(!m_pMemoryEnd || *(PINT)m_pMemoryEnd == 0xCCDDCCEE);
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#endif
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}
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/*
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* 检查引用赋值
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*/
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inline CDataPacket& operator = (const CDataPacket& an)
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{
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//禁止引用赋值！
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#ifdef WIN32
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Assert(false);
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#else
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return *this;
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#endif
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}
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public:
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/* 写入原子数据的运算符重载 */
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template <typename T>
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inline CDataPacket& operator << (T val)
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{
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if ( sizeof(val) <= sizeof(INT_PTR) )
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writeAtom<T>(val);
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else writeBuf(&val, sizeof(val));
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return *this;
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}
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inline CDataPacket& operator << (const char* val)
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{
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writeString(val, strlen(val));
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return *this;
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}
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inline CDataPacket& operator << (char* val)
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{
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writeString(val, strlen(val));
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return *this;
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}
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inline CDataPacket& operator << (const wchar_t* val)
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{
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#ifdef WIN32
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writeWideString(val, wcslen(val));
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#endif
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return *this;
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}
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inline CDataPacket& operator << (wchar_t* val)
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{
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#ifdef WIN32
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writeWideString(val, wcslen(val));
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#endif
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return *this;
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}
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public:
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typedef CDataPacketReader Inherited;
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CDataPacket()
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:Inherited()
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{
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m_pAllocator = NULL;
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}
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CDataPacket(const CDataPacket &another)
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{
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//为了防止将引用赋值给一个对象，此处禁止从另一个对象中构造
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#ifdef WIN32
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Assert(FALSE);
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#else
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//return *this;
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#endif
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}
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CDataPacket(LPCVOID lpDataPtr, size_t dwSize)
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:Inherited(lpDataPtr, dwSize)
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{
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m_pDataEnd = m_pMemory;
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m_pAllocator = NULL;
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}
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CDataPacket(CBufferAllocator *pAllocator)
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:Inherited()
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{
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m_pAllocator = pAllocator;
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}
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~CDataPacket()
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{
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if ( m_pMemory && m_pAllocator )
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{
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m_pAllocator->FreeBuffer(m_pMemory);
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m_pMemory = m_pMemoryEnd = m_pOffset = m_pDataEnd = NULL;
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}
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}
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// 设置分配器
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inline void setAllocator(CBufferAllocator *pAllocator) { m_pAllocator = pAllocator; }
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protected:
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/* 重新设定数据包内存空间大小 */
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void setSize(size_t dwNewSize)
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{
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char *pOldMemory = m_pMemory;
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//内存长度按CDataPacket::MemoryAlginmentSize字节对齐
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//数据长度增加4字节，用于增加0终止，以便进行字符串的结尾调试
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dwNewSize = (dwNewSize + MemoryAlginmentSize) & (~(MemoryAlginmentSize - 1));
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#ifdef _DPPACK_MEM_CHK_
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char *pMemory = (char*)m_pAllocator->AllocBuffer(dwNewSize + sizeof(INT));
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#else
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char *pMemory = (char*)m_pAllocator->AllocBuffer(dwNewSize);
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#endif
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size_t dwOffset = m_pOffset - m_pMemory;
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size_t dwLength = m_pDataEnd - m_pMemory;
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if ( dwLength > 0 )
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{
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memcpy(pMemory, m_pMemory, __min(dwNewSize, dwLength));
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}
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//重设数据指针
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m_pMemory = pMemory;
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m_pMemoryEnd = m_pMemory + dwNewSize;
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#ifdef _DPPACK_MEM_CHK_
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*(PINT)m_pMemoryEnd = 0xCCDDCCEE;
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#endif
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m_pOffset = m_pMemory + dwOffset;
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m_pDataEnd = m_pMemory + dwLength;
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//销毁原有数据内存
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if ( pOldMemory )
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{
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_Assert();
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m_pAllocator->FreeBuffer(pOldMemory);
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}
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}
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/* 写入ANSI短字符串以及字符串数据
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* 字符串的数据格式为：[2字节字符长度数据][字符串字节数据，字符串长度在65536以内][字符串终止字符0]，字符串中超过索引65535后的部分将被忽略
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* 在字符串之前写入sizeof(TL)字节的长度值，且会再字符串末尾写入终止字符
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* <TL> 定义字符串长度描述数据的数据类型，对于短字符串应当为unsigned char，否则即是unsigned short
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* len 如果值为-1，则自动计算str的长度
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*/
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template <typename TL>
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void rawWriteStringLen(const char* str, size_t len)
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{
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if ( len == -1 )
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len = str?(TL)strlen(str):0;
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writeAtom<TL>((TL)len);//写入长度
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writeBuf(str, len * sizeof(*str));
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writeAtom<char>(0);//写入终止字符
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}
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/* 写入UNICODE16短字符串以及字符串数据
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* 规则与rawWriteLengthString相同
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*/
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template <typename TL>
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void rawWriteWideStringLen(const wchar_t* str, size_t len)
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{
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#ifdef WIN32
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if ( len == -1 )
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len = str?(TL)wcslen(str):0;
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writeAtom<TL>((TL)len);//写入长度
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writeBuf(str, len * sizeof(*str));
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writeAtom<wchar_t>(0);//写入终止字符
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#endif
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}
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protected:
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CBufferAllocator *m_pAllocator; //内存申请器
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private:
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static const size_t MemoryAlginmentSize = 256; //数据包内存长度对齐边界
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};
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