203 lines
6 KiB
C++
203 lines
6 KiB
C++
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/*************************************************************************
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* *
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* ITUTILS.CPP *
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* *
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* Copyright (C) Microsoft Corporation 1997 *
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* All Rights reserved. *
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* *
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**************************************************************************
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* *
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* Module Intent *
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* Provide a place to put miscellaneous utility routines. *
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* *
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**************************************************************************
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* *
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* Current Owner: InfoTech Team *
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* *
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*************************************************************************/
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#include <mvopsys.h>
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#ifdef _DEBUG
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static char s_aszModule[] = __FILE__; /* For error report */
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#endif
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#include <mem.h>
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#include <orkin.h>
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#include <iterror.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*************************************************************************
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* @doc INTERNAL
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*
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* @func HRESULT FAR PASCAL | ReallocBufferHmem |
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* This function will reallocate or allocate anew a buffer of
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* requested size.
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*
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* @parm HGLOBAL | *phmemBuf |
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* Pointer to buffer handle; buffer handle can be NULL if
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* a new buffer needs to be allocated. New buffer handle
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* is returned through this param.
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*
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* @parm DWORD | *pcbBufCur |
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* Current size of existing buffer, if any. Should be
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* 0 if *phmemBuf == 0. New size is returned through
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* this param.
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*
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* @parm DWORD | cbBufNew |
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* Current size of existing buffer, if any. Should be
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* 0 if *phmemBuf == 0.
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*
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* @rvalue E_POINTER | phmemBuf or pcbBufCur was NULL
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* @rvalue E_OUTOFMEMORY | Ran out of memory (re)allocating the buffer.
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*************************************************************************/
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HRESULT FAR PASCAL ReallocBufferHmem(HGLOBAL *phmemBuf, DWORD *pcbBufCur,
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DWORD cbBufNew)
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{
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HRESULT hr = S_OK;
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if (phmemBuf == NULL || pcbBufCur == NULL)
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return (E_POINTER);
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// Need to make sure we have a buffer big enough to hold what the caller
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// needs to store.
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if (cbBufNew > *pcbBufCur)
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{
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HGLOBAL hmemNew;
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if (*phmemBuf == NULL)
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hmemNew = _GLOBALALLOC(GMEM_MOVEABLE, cbBufNew);
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else
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hmemNew = _GLOBALREALLOC(*phmemBuf, cbBufNew, GMEM_MOVEABLE);
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if (hmemNew != NULL)
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{
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// Do reassignment just in case the new hmem is different
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// than the old or if we just allocated a buffer for the
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// first time.
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*phmemBuf = hmemNew;
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*pcbBufCur = cbBufNew;
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}
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else
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// A pre-existing *phmemBuf is still valid;
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// we'll free it in Close().
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hr = E_OUTOFMEMORY;
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}
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return (hr);
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}
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/*************************************************************************
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* @doc INTERNAL
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*
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* @func void FAR PASCAL | SetGrfFlag |
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* Sets or clears a bit flag in a group of flags.
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*
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* @parm DWORD | *pgrf |
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* Pointer to the group of flags.
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*
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* @parm DWORD | fGrfFlag |
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* Flag to set or clear.
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*
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* @parm BOOL | fSet |
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* TRUE to set fGrfFlag; FALSE to clear fGrfFlag.
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*************************************************************************/
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void FAR PASCAL SetGrfFlag(DWORD *pgrf, DWORD fGrfFlag, BOOL fSet)
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{
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if (pgrf == NULL)
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return;
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*pgrf &= (~fGrfFlag);
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if (fSet)
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*pgrf |= fGrfFlag;
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}
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/*
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Memory Maps a give file for Read-Only, sequential access
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Return a pointer to the memory mapped address space and sets
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pdwFileSize to the size of the file if it is not NULL.
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*/
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LPSTR MapSequentialReadFile(LPCSTR szFilename, LPDWORD pdwFileSize)
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{
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LPSTR pMemory;
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HANDLE hInput, hMemMap;
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if (NULL == szFilename)
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return NULL;
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// Open input file
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hInput = CreateFile(szFilename, GENERIC_READ, FILE_SHARE_READ,
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NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
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if (INVALID_HANDLE_VALUE == hInput)
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return NULL;
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// Get the file size for the user
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if (pdwFileSize)
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*pdwFileSize = GetFileSize(hInput, NULL);
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// Create file mapping object
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hMemMap = CreateFileMapping(hInput, NULL, PAGE_READONLY, 0, 0, NULL);
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CloseHandle(hInput); // Done with this handle
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if (NULL == hMemMap)
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return NULL;
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// Link the object to memory space
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pMemory =(LPSTR)MapViewOfFile(hMemMap, FILE_MAP_READ, 0, 0, 0);
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CloseHandle(hMemMap); // Done with this handle
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return pMemory;
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} /* MapSequentialReadFile */
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// This routine was extracted from the C runtime, simplified, and renamed.
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/***
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*int _wcsicmp(dst, src) - compare wide-character strings, ignore case
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*
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*Purpose:
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* _wcsicmp perform a case-insensitive wchar_t string comparision.
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*
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*Entry:
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* wchar_t *dst, *src - strings to compare
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*
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*Return:
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* <0 if dst < src
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* 0 if dst = src
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* >0 if dst > src
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* This range of return values may differ from other *cmp/*coll functions.
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _it_wcsicmp (
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const wchar_t * dst,
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const wchar_t * src
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)
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{
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wchar_t f,l;
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do {
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f = ((*dst <= L'Z') && (*dst >= L'A'))
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? *dst + L'a' - L'A'
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: *dst;
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l = ((*src <= L'Z') && (*src >= L'A'))
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? *src + L'a' - L'A'
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: *src;
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dst++;
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src++;
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} while ( (f) && (f == l) );
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return (int)(f - l);
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}
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#ifdef __cplusplus
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}
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#endif
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