From 16f738ecee689c6feb2acb7e4ef4d9bb4144ae7d Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@users.sourceforge.net>
Date: Sun, 8 Jun 2008 11:04:43 +0200
Subject: Initial commit

---
 zip/ZipArchive/ZipMemFile.cpp | 110 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 zip/ZipArchive/ZipMemFile.cpp

(limited to 'zip/ZipArchive/ZipMemFile.cpp')

diff --git a/zip/ZipArchive/ZipMemFile.cpp b/zip/ZipArchive/ZipMemFile.cpp
new file mode 100644
index 0000000..4fae328
--- /dev/null
+++ b/zip/ZipArchive/ZipMemFile.cpp
@@ -0,0 +1,110 @@
+////////////////////////////////////////////////////////////////////////////////
+// This source file is part of the ZipArchive library source distribution and
+// is Copyrighted 2000 - 2007 by Artpol Software - Tadeusz Dracz
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+// 
+// For the licensing details refer to the License.txt file.
+//
+// Web Site: http://www.artpol-software.com
+////////////////////////////////////////////////////////////////////////////////
+
+#include "stdafx.h"
+#include "ZipMemFile.h"
+#include "ZipException.h"
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+void CZipMemFile::Grow(size_t nGrowTo)
+{
+	if (m_nBufSize < (UINT)nGrowTo)
+	{
+		if (m_nGrowBy == 0)
+			CZipException::Throw(CZipException::memError);
+		size_t nNewSize = m_nBufSize;
+		while (nNewSize < nGrowTo)
+			nNewSize += m_nGrowBy;
+		BYTE* lpNew;
+		if (m_lpBuf)
+			lpNew = (BYTE*)realloc((void*) m_lpBuf, nNewSize);
+		else
+			lpNew = (BYTE*)malloc(nNewSize);
+
+		if (!lpNew)
+			CZipException::Throw(CZipException::memError);
+		m_nBufSize = nNewSize;
+		m_lpBuf = lpNew;
+	}
+} 
+
+void CZipMemFile::SetLength(ZIP_FILE_USIZE nNewLen)
+{
+	if (m_nBufSize < (size_t)nNewLen)
+		Grow((size_t)nNewLen);
+	else
+		m_nPos = (size_t)nNewLen;
+	m_nDataSize = (size_t)nNewLen;
+}
+
+UINT CZipMemFile::Read(void *lpBuf, UINT nCount)
+{
+	if (m_nPos >= m_nDataSize)
+		return 0;
+	UINT nToRead = (m_nPos + nCount > m_nDataSize) ? (UINT)(m_nDataSize - m_nPos) : nCount;
+	memcpy(lpBuf, m_lpBuf + m_nPos, nToRead);
+	m_nPos += nToRead;
+	return nToRead;
+
+}
+
+void CZipMemFile::Write(const void *lpBuf, UINT nCount)
+{
+	if (!nCount)
+		return;
+
+	if (m_nPos + nCount > m_nBufSize)
+		Grow(m_nPos + nCount);
+	memcpy(m_lpBuf + m_nPos, lpBuf, nCount);
+	m_nPos += nCount;
+	if (m_nPos > m_nDataSize)
+		m_nDataSize = m_nPos;
+}
+ZIP_FILE_USIZE CZipMemFile::Seek(ZIP_FILE_SIZE lOff, int nFrom)
+{
+	ZIP_FILE_USIZE lNew = m_nPos;
+
+	if (nFrom == CZipAbstractFile::begin)
+	{
+		if (lOff < 0)
+			CZipException::Throw(CZipException::memError);
+		lNew = lOff;
+	}
+	else if (nFrom == CZipAbstractFile::current)
+	{
+		if (lOff < 0 && (ZIP_FILE_USIZE)(-lOff) > lNew)
+			CZipException::Throw(CZipException::memError);
+		lNew += lOff;
+	}
+	else if (nFrom == CZipAbstractFile::end)
+	{
+		if (lOff < 0 && ZIP_FILE_USIZE(-lOff) > m_nDataSize)
+			CZipException::Throw(CZipException::memError);
+		lNew = m_nDataSize + lOff;
+	}
+	else
+		return lNew;
+
+	// assumption that size_t is always signed
+	if (lNew > (size_t)(-1)) // max of size_t
+		CZipException::Throw(CZipException::memError);
+	if (lNew > m_nDataSize)
+		Grow((size_t)lNew);
+	
+	m_nPos = (size_t)lNew;
+	return lNew;
+}
-- 
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