100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
// ZipMemFile.cpp: implementation of the CZipMemFile class.
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// Part of the ZipArchive library
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//
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// Copyright (C) 2000 - 2001 Tadeusz Dracz.
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// For the licensing details see the file License.txt
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////////////////////////////////////////////////////////////////////////////////
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#include "stdafx.h"
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#include "zipmemfile.h"
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#include "zipexception.h"
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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void CZipMemFile::Grow(long nGrowTo)
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{
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if (m_nBufSize < (UINT)nGrowTo)
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{
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if (m_nGrowBy == 0)
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CZipException::Throw(CZipException::memError);
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long nNewSize = m_nBufSize;
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while (nNewSize < nGrowTo)
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nNewSize += m_nGrowBy;
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BYTE* lpNew;
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if (m_lpBuf)
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lpNew = (BYTE*)realloc((void*) m_lpBuf, nNewSize);
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else
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lpNew = (BYTE*)malloc(nNewSize);
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if (!lpNew)
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CZipException::Throw(CZipException::memError);
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m_nBufSize = nNewSize;
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m_lpBuf = lpNew;
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}
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}
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void CZipMemFile::SetLength(long nNewLen)
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{
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if (m_nBufSize < (UINT)nNewLen)
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Grow(nNewLen);
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else
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m_nPos = nNewLen;
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m_nDataSize = nNewLen;
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}
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UINT CZipMemFile::Read(void *lpBuf, UINT nCount)
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{
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if (m_nPos > m_nDataSize)
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return 0;
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UINT nToRead = (m_nPos + nCount > m_nDataSize) ? m_nDataSize - m_nPos : nCount;
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memcpy(lpBuf, m_lpBuf + m_nPos, nToRead);
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m_nPos += nToRead;
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return nToRead;
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}
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void CZipMemFile::Write(const void *lpBuf, UINT nCount)
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{
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if (!nCount)
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return;
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if (m_nPos + nCount > m_nBufSize)
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Grow(m_nPos + nCount);
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memcpy(m_lpBuf + m_nPos, lpBuf, nCount);
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m_nPos += nCount;
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if (m_nPos > m_nDataSize)
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m_nDataSize = m_nPos;
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}
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long CZipMemFile::Seek(long lOff, int nFrom)
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{
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long lNew = m_nPos;
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if (nFrom == CZipAbstractFile::begin)
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lNew = lOff;
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else if (nFrom == CZipAbstractFile::current)
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lNew += lOff;
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else if (nFrom == CZipAbstractFile::end)
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lNew = m_nDataSize + lOff;
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else
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return lNew;
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if (lNew< 0)
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CZipException::Throw(CZipException::memError);
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m_nPos = lNew;
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return lNew;
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}
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bool CZipMemFile::Open(LPCTSTR lpszFileName, UINT openFlags, bool shareMode)
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{
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return 1;
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}
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