184 lines
4.0 KiB
C++
184 lines
4.0 KiB
C++
#include "stdafx.h"
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#include "cEncrypt.h"
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// cEncrypt
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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cEncrypt::cEncrypt() : m_nArrayLen(4028)
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{
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m_pArrayBuffer = new uint8[m_nArrayLen];
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}
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cEncrypt::~cEncrypt()
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{
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if(m_pArrayBuffer)
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{
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delete []m_pArrayBuffer;
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m_pArrayBuffer = NULL;
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}
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}
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uint32 cEncrypt::Compress(const uint8 *lpSource, uint32 nSourceLen, uint8 *lpDestination)
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{
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uint32 nIndex = 0;
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uint32 nZeroCount = 0;
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uint32 nZeroBit = 0;
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uint32 nBitArrayCount = 0;
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uint32 nUsedBytes = 0;
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uint8 bBit = 0;
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ZeroMemory(m_pArrayBuffer, m_nArrayLen);
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for(uint32 i = 0; i < nSourceLen; ++i)
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{
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if(0 == lpSource[i])
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{
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++nZeroCount;
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nZeroBit = i % 8;
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nBitArrayCount = i >> 3;
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bBit = 1;
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bBit = bBit << nZeroBit;
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m_pArrayBuffer[nBitArrayCount] = m_pArrayBuffer[nBitArrayCount] | bBit;
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if(nUsedBytes < nBitArrayCount) nUsedBytes = nBitArrayCount;
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}
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else
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{
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// 1바이트씩 복사
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lpDestination[nIndex++] = lpSource[i];
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}
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}
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if(nZeroCount > 0) ++nUsedBytes;
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memmove(lpDestination+sizeof(uint16)+nUsedBytes, lpDestination, nSourceLen-nZeroCount);
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CopyMemory(lpDestination, &nUsedBytes, sizeof(uint16)); // + 널값정보에 이용되는 버퍼 길이 2Byte
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CopyMemory(lpDestination+sizeof(uint16), m_pArrayBuffer, nUsedBytes);
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return (sizeof(uint16) + nUsedBytes + nSourceLen - nZeroCount);
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}
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uint32 cEncrypt::Decompress(const uint8 *lpSource, uint32 nSourceLen, uint8 *lpDestination)
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{
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uint16 nBitArrayCount = 0;
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uint32 nOriginalLen = 0;
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uint32 nBufferCount = 0;
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charBit *pTempByte;
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CopyMemory(&nBitArrayCount, lpSource, sizeof(unsigned short));
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nOriginalLen = nSourceLen-sizeof(uint16);
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nBufferCount = nOriginalLen = nOriginalLen - nBitArrayCount;
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ZeroMemory(m_pArrayBuffer, m_nArrayLen);
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CopyMemory(m_pArrayBuffer, lpSource+sizeof(uint16), nBitArrayCount);
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const uint8* lpData = (lpSource + sizeof(uint16) + nBitArrayCount);
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uint32 nSource = 0, nDestination = 0;
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for(uint32 i=0; i < nBitArrayCount; ++i)
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{
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pTempByte = reinterpret_cast<charBit*>(&m_pArrayBuffer[i]);
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if(pTempByte->v1==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v2==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v3==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v4==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v5==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v6==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v7==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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if(pTempByte->v8==0)
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{
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if(nSource < nBufferCount)
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lpDestination[nDestination++] = lpData[nSource++];
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}
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else
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{
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lpDestination[nDestination++] = 0;
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++nOriginalLen;
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}
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}
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// 아직 데이타가 남아있으면 넣어준다
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// (m_pArrayBuffer 처리 이후에도 값이 남아있는경우는 (byte단위로)NULL값 없이 연속으로 데이터가 있는경우이다)
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for( ; nSource < nBufferCount;)
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{
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lpDestination[nDestination++] = lpData[nSource++];
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}
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return nOriginalLen;
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}
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