142 lines
2.3 KiB
C++
142 lines
2.3 KiB
C++
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/*****************************************************************************\
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* MODULE: stream.cxx
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*
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* The module contains the stream interface for file and memory access
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*
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* Copyright (C) 1997-1998 Microsoft Corporation
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*
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* History:
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* 09/20/00 Weihaic Created
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*
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\*****************************************************************************/
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#include "precomp.h"
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#include "priv.h"
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CStream::CStream ():
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m_dwCurPos (0),
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m_bValid(FALSE)
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{
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}
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BOOL
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CStream::Reset (
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VOID)
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{
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return SetPtr(0);
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}
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BOOL
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CStream::GetTotalSize (
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PDWORD pdwSize) CONST
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{
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BOOL bRet = FALSE;
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if (m_bValid && pdwSize) {
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*pdwSize = m_dwTotalSize;
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bRet = TRUE;
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}
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return bRet;
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}
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CMemStream::CMemStream (
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PBYTE pMem,
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DWORD dwTotalSize):
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m_pMem (pMem)
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{
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m_dwTotalSize = dwTotalSize;
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m_bValid = TRUE;
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}
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BOOL
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CMemStream::SetPtr (
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DWORD dwPos)
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{
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BOOL bRet = FALSE;
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if (m_dwCurPos < m_dwTotalSize)
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{
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m_dwCurPos = dwPos;
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bRet = TRUE;
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}
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return bRet;
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}
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BOOL
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CMemStream::Read (
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PBYTE pBuf,
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DWORD dwBufSize,
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PDWORD pdwSizeRead)
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{
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DWORD dwSizeLeft = m_dwTotalSize - m_dwCurPos;
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*pdwSizeRead = (dwSizeLeft > dwBufSize)?dwBufSize:dwSizeLeft;
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CopyMemory (pBuf, m_pMem + m_dwCurPos, *pdwSizeRead);
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return TRUE;
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}
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CFileStream::CFileStream (
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HANDLE hFile):
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m_hFile (hFile)
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{
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BOOL bRet = FALSE;
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LARGE_INTEGER LargeSize;
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if (GetFileSizeEx (m_hFile, &LargeSize) && LargeSize.HighPart == 0) {
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m_dwTotalSize = LargeSize.LowPart;
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bRet = TRUE;
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}
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m_bValid = bRet;
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}
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BOOL
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CFileStream::SetPtr (
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DWORD dwPos)
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{
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BOOL bRet = FALSE;
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LARGE_INTEGER LargePos;
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LargePos.LowPart = dwPos;
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LargePos.HighPart = 0;
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if (m_bValid) {
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if (SetFilePointerEx (m_hFile, LargePos, NULL, FILE_BEGIN)) {
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m_dwCurPos = dwPos;
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bRet = TRUE;
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}
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}
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return bRet;
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}
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BOOL
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CFileStream::Read (
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PBYTE pBuf,
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DWORD dwBufSize,
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PDWORD pdwSizeRead)
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{
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BOOL bRet = FALSE;
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if (m_bValid) {
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if (ReadFile (m_hFile, pBuf, dwBufSize, pdwSizeRead, NULL)) {
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m_dwCurPos+= *pdwSizeRead;
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bRet = TRUE;
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}
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}
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return bRet;
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}
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