windows-nt/Source/XPSP1/NT/shell/shlwapi/ole2dup.c

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2020-09-26 03:20:57 -05:00
//---------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation 1991-1993
//
// File: ole2dup.c
//
// This file contains all the duplicated code from OLE 2.0 DLLs to avoid
// any link to their DLLs from the shell. If we decided to have links to
// them, we need to delete these files.
//
// History:
// 04-16-97 AndyP moved parts to shlwapi (from shell32)
// 12-29-92 SatoNa Created.
//
//---------------------------------------------------------------------------
#include "priv.h"
//
// SHStringFromGUIDA
//
// converts GUID into (...) form without leading identifier; returns
// amount of data copied to lpsz if successful; 0 if buffer too small.
//
// An endian-dependant map of what bytes go where in the GUID
// text representation.
//
// Do NOT use the TEXT() macro in GuidMap... they're intended to be bytes
//
static const BYTE c_rgbGuidMap[] = { 3, 2, 1, 0, '-', 5, 4, '-', 7, 6, '-',
8, 9, '-', 10, 11, 12, 13, 14, 15 };
static const CHAR c_szDigitsA[] = "0123456789ABCDEF";
static const WCHAR c_szDigitsW[] = TEXTW("0123456789ABCDEF");
STDAPI_(int)
SHStringFromGUIDA(
UNALIGNED REFGUID rguid,
LPSTR psz,
int cchMax)
{
int i;
const BYTE * pBytes = (const BYTE *) rguid;
if (cchMax < GUIDSTR_MAX)
return 0;
#ifdef BIG_ENDIAN
// This is the slow, but portable version
wnsprintf(psz, cchMax,"{%08lX-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
rguid->Data1, rguid->Data2, rguid->Data3,
rguid->Data4[0], rguid->Data4[1],
rguid->Data4[2], rguid->Data4[3],
rguid->Data4[4], rguid->Data4[5],
rguid->Data4[6], rguid->Data4[7]);
#else
// The following algorithm is faster than the wsprintf.
*psz++ = '{';
for (i = 0; i < SIZEOF(c_rgbGuidMap); i++)
{
if (c_rgbGuidMap[i] == '-') // don't TEXT() this line
{
*psz++ = '-';
}
else
{
// Convert a byte-value into a character representation
*psz++ = c_szDigitsA[ (pBytes[c_rgbGuidMap[i]] & 0xF0) >> 4 ];
*psz++ = c_szDigitsA[ (pBytes[c_rgbGuidMap[i]] & 0x0F) ];
}
}
*psz++ = '}';
*psz = '\0';
#endif /* !BIG_ENDIAN */
return GUIDSTR_MAX;
}
STDAPI_(int)
SHStringFromGUIDW(
UNALIGNED REFGUID rguid,
LPWSTR psz,
int cchMax)
{
int i;
const BYTE * pBytes = (const BYTE *) rguid;
if (cchMax < GUIDSTR_MAX)
return 0;
#ifdef BIG_ENDIAN
// This is the slow, but portable version
wnsprintfW(psz, cchMax, L"{%08lX-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
rguid->Data1, rguid->Data2, rguid->Data3,
rguid->Data4[0], rguid->Data4[1],
rguid->Data4[2], rguid->Data4[3],
rguid->Data4[4], rguid->Data4[5],
rguid->Data4[6], rguid->Data4[7]);
#else
// The following algorithm is faster than the wsprintf.
*psz++ = TEXTW('{');
for (i = 0; i < SIZEOF(c_rgbGuidMap); i++)
{
if (c_rgbGuidMap[i] == '-') // don't TEXT() this line
{
*psz++ = TEXTW('-');
}
else
{
// Convert a byte-value into a character representation
*psz++ = c_szDigitsW[ (pBytes[c_rgbGuidMap[i]] & 0xF0) >> 4 ];
*psz++ = c_szDigitsW[ (pBytes[c_rgbGuidMap[i]] & 0x0F) ];
}
}
*psz++ = TEXTW('}');
*psz = TEXTW('\0');
#endif /* !BIG_ENDIAN */
return GUIDSTR_MAX;
}
// this makes sure the DLL for the given clsid stays in memory
// this is needed because we violate COM rules and hold apparment objects
// across the lifetime of appartment threads. these objects really need
// to be free threaded (we have always treated them as such)
//
// Look in the registry and pull out the name of the DLL who owns
// the CLSID. We must pull the DLL name as unicode in case the
// DLL name contains unicode characters.
//
STDAPI_(HINSTANCE) SHPinDllOfCLSID(const CLSID *pclsid)
{
HKEY hk;
DWORD dwSize;
HINSTANCE hinst = NULL;
TCHAR szClass[GUIDSTR_MAX + 64]; // CLSID\{...}\InProcServer32
WCHAR szDllPath[MAX_PATH];
lstrcpy(szClass, TEXT("CLSID\\"));
SHStringFromGUID(pclsid, szClass+6, GUIDSTR_MAX); // 6 = strlen("CLSID\\")
lstrcat(szClass, TEXT("\\InProcServer32"));
if (RegOpenKeyEx(HKEY_CLASSES_ROOT, szClass, 0, KEY_QUERY_VALUE, &hk)
== ERROR_SUCCESS) {
// Explicitly read as unicode. SHQueryValueEx handles REG_EXPAND_SZ
dwSize = SIZEOF(szDllPath);
if (SHQueryValueExW(hk, 0, 0, 0, szDllPath, &dwSize) == ERROR_SUCCESS) {
hinst = LoadLibraryExWrapW(szDllPath, NULL, 0);
}
RegCloseKey(hk);
}
return hinst;
}
// scan psz for a number of hex digits (at most 8); update psz, return
// value in Value; check for chDelim; return TRUE for success.
BOOL HexStringToDword(LPCTSTR * ppsz, DWORD * lpValue, int cDigits, TCHAR chDelim)
{
int ich;
LPCTSTR psz = *ppsz;
DWORD Value = 0;
BOOL fRet = TRUE;
for (ich = 0; ich < cDigits; ich++)
{
TCHAR ch = psz[ich];
if (InRange(ch, TEXT('0'), TEXT('9')))
{
Value = (Value << 4) + ch - TEXT('0');
}
else if ( InRange( (ch |= (TEXT('a')-TEXT('A'))), TEXT('a'), TEXT('f')) )
{
Value = (Value << 4) + ch - TEXT('a') + 10;
}
else
return(FALSE);
}
if (chDelim)
{
fRet = (psz[ich++] == chDelim);
}
*lpValue = Value;
*ppsz = psz+ich;
return fRet;
}
// parse above format; return TRUE if succesful; always writes over *pguid.
STDAPI_(BOOL) GUIDFromString(LPCTSTR psz, GUID *pguid)
{
DWORD dw;
if (*psz++ != TEXT('{') /*}*/ )
return FALSE;
if (!HexStringToDword(&psz, &pguid->Data1, SIZEOF(DWORD)*2, TEXT('-')))
return FALSE;
if (!HexStringToDword(&psz, &dw, SIZEOF(WORD)*2, TEXT('-')))
return FALSE;
pguid->Data2 = (WORD)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(WORD)*2, TEXT('-')))
return FALSE;
pguid->Data3 = (WORD)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[0] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, TEXT('-')))
return FALSE;
pguid->Data4[1] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[2] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[3] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[4] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[5] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, 0))
return FALSE;
pguid->Data4[6] = (BYTE)dw;
if (!HexStringToDword(&psz, &dw, SIZEOF(BYTE)*2, /*(*/ TEXT('}')))
return FALSE;
pguid->Data4[7] = (BYTE)dw;
return TRUE;
}
#ifdef UNICODE
LWSTDAPI_(BOOL) GUIDFromStringA(LPCSTR psz, GUID *pguid)
{
TCHAR sz[GUIDSTR_MAX];
SHAnsiToTChar(psz, sz, SIZECHARS(sz));
return GUIDFromString(sz, pguid);
}
#else
LWSTDAPI_(BOOL) GUIDFromStringW(LPCWSTR psz, GUID *pguid)
{
TCHAR sz[GUIDSTR_MAX];
SHUnicodeToAnsi(psz, sz, SIZECHARS(sz));
return GUIDFromString(sz, pguid);
}
#endif // UNICODE