You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
2.4 KiB
141 lines
2.4 KiB
/*****************************************************************************\
|
|
* MODULE: stream.cxx
|
|
*
|
|
* The module contains the stream interface for file and memory access
|
|
*
|
|
* Copyright (C) 1997-1998 Microsoft Corporation
|
|
*
|
|
* History:
|
|
* 09/20/00 Weihaic Created
|
|
*
|
|
\*****************************************************************************/
|
|
|
|
|
|
#include "precomp.h"
|
|
#include "priv.h"
|
|
|
|
CStream::CStream ():
|
|
m_dwCurPos (0),
|
|
m_bValid(FALSE)
|
|
{
|
|
}
|
|
|
|
BOOL
|
|
CStream::Reset (
|
|
VOID)
|
|
{
|
|
return SetPtr(0);
|
|
}
|
|
|
|
BOOL
|
|
CStream::GetTotalSize (
|
|
PDWORD pdwSize) CONST
|
|
{
|
|
BOOL bRet = FALSE;
|
|
|
|
if (m_bValid && pdwSize) {
|
|
*pdwSize = m_dwTotalSize;
|
|
|
|
bRet = TRUE;
|
|
}
|
|
|
|
return bRet;
|
|
}
|
|
|
|
CMemStream::CMemStream (
|
|
PBYTE pMem,
|
|
DWORD dwTotalSize):
|
|
m_pMem (pMem)
|
|
{
|
|
m_dwTotalSize = dwTotalSize;
|
|
m_bValid = TRUE;
|
|
}
|
|
|
|
|
|
BOOL
|
|
CMemStream::SetPtr (
|
|
DWORD dwPos)
|
|
{
|
|
BOOL bRet = FALSE;
|
|
|
|
if (m_dwCurPos < m_dwTotalSize)
|
|
{
|
|
m_dwCurPos = dwPos;
|
|
bRet = TRUE;
|
|
}
|
|
|
|
return bRet;
|
|
}
|
|
|
|
BOOL
|
|
CMemStream::Read (
|
|
PBYTE pBuf,
|
|
DWORD dwBufSize,
|
|
PDWORD pdwSizeRead)
|
|
{
|
|
DWORD dwSizeLeft = m_dwTotalSize - m_dwCurPos;
|
|
|
|
*pdwSizeRead = (dwSizeLeft > dwBufSize)?dwBufSize:dwSizeLeft;
|
|
|
|
CopyMemory (pBuf, m_pMem + m_dwCurPos, *pdwSizeRead);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|
|
CFileStream::CFileStream (
|
|
HANDLE hFile):
|
|
m_hFile (hFile)
|
|
{
|
|
BOOL bRet = FALSE;
|
|
LARGE_INTEGER LargeSize;
|
|
|
|
if (GetFileSizeEx (m_hFile, &LargeSize) && LargeSize.HighPart == 0) {
|
|
m_dwTotalSize = LargeSize.LowPart;
|
|
bRet = TRUE;
|
|
}
|
|
|
|
m_bValid = bRet;
|
|
}
|
|
|
|
BOOL
|
|
CFileStream::SetPtr (
|
|
DWORD dwPos)
|
|
{
|
|
BOOL bRet = FALSE;
|
|
LARGE_INTEGER LargePos;
|
|
|
|
LargePos.LowPart = dwPos;
|
|
LargePos.HighPart = 0;
|
|
|
|
if (m_bValid) {
|
|
|
|
if (SetFilePointerEx (m_hFile, LargePos, NULL, FILE_BEGIN)) {
|
|
m_dwCurPos = dwPos;
|
|
bRet = TRUE;
|
|
}
|
|
}
|
|
return bRet;
|
|
}
|
|
|
|
BOOL
|
|
CFileStream::Read (
|
|
PBYTE pBuf,
|
|
DWORD dwBufSize,
|
|
PDWORD pdwSizeRead)
|
|
{
|
|
BOOL bRet = FALSE;
|
|
|
|
if (m_bValid) {
|
|
|
|
if (ReadFile (m_hFile, pBuf, dwBufSize, pdwSizeRead, NULL)) {
|
|
m_dwCurPos+= *pdwSizeRead;
|
|
bRet = TRUE;
|
|
}
|
|
|
|
}
|
|
return bRet;
|
|
}
|
|
|
|
|