[npwoods] 18260: Notepad: Fixed a bug when opening files with no characters other than byte order marks

Notepad:  Fixed a bug when opening files with no characters other than
byte order marks
Modified: trunk/reactos/subsys/system/notepad/text.c
  _____  

Modified: trunk/reactos/subsys/system/notepad/text.c
--- trunk/reactos/subsys/system/notepad/text.c	2005-10-04 12:41:08 UTC
(rev 18259)
+++ trunk/reactos/subsys/system/notepad/text.c	2005-10-04 12:57:04 UTC
(rev 18260)
@@ -130,16 +130,27 @@

 		else
 			goto done;
 
-		dwCharCount = MultiByteToWideChar(iCodePage, 0,
(LPCSTR)&pBytes[dwPos], dwSize - dwPos, NULL, 0);
-		if (dwCharCount == 0)
-			goto done;
+		if ((dwSize - dwPos) > 0)
+		{
+			dwCharCount = MultiByteToWideChar(iCodePage, 0,
(LPCSTR)&pBytes[dwPos], dwSize - dwPos, NULL, 0);
+			if (dwCharCount == 0)
+				goto done;
+		}
+		else
+		{
+			/* special case for files with no characters
(other than BOMs) */
+			dwCharCount = 0;
+		}
 
 		pszAllocText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0,
(dwCharCount + 1) * sizeof(WCHAR));
 		if (!pszAllocText)
 			goto done;
 
-		if (!MultiByteToWideChar(iCodePage, 0,
(LPCSTR)&pBytes[dwPos], dwSize - dwPos, pszAllocText, dwCharCount))
-			goto done;
+		if ((dwSize - dwPos) > 0)
+		{
+			if (!MultiByteToWideChar(iCodePage, 0,
(LPCSTR)&pBytes[dwPos], dwSize - dwPos, pszAllocText, dwCharCount))
+				goto done;
+		}
 
 		pszAllocText[dwCharCount] = '\0';
 		pszText = pszAllocText;