Alexandre Julliard : ntdll: Avoid using tolowerW().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 7a974814cda795801fb845887508e85edaa67df6
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=7a974814cda795801fb845887508e85edaa67df6

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Mon Mar 30 12:09:15 2020 +0200

ntdll: Avoid using tolowerW().

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ntdll/directory.c | 31 +++++++++++++------------------
 dlls/ntdll/loader.c    | 13 +++++++------
 dlls/ntdll/locale.c    |  4 +++-
 3 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/dlls/ntdll/directory.c b/dlls/ntdll/directory.c
index cb9ce3740e..80777da149 100644
--- a/dlls/ntdll/directory.c
+++ b/dlls/ntdll/directory.c
@@ -1316,8 +1316,8 @@ static ULONG hash_short_file_name( const UNICODE_STRING *name, LPWSTR buffer )
     if (!is_case_sensitive)
     {
         for (p = name->Buffer, hash = 0xbeef; p < end - 1; p++)
-            hash = (hash<<3) ^ (hash>>5) ^ tolowerW(*p) ^ (tolowerW(p[1]) << 8);
-        hash = (hash<<3) ^ (hash>>5) ^ tolowerW(*p); /* Last character */
+            hash = (hash<<3) ^ (hash>>5) ^ RtlDowncaseUnicodeChar(*p) ^ (RtlDowncaseUnicodeChar(p[1]) << 8);
+        hash = (hash<<3) ^ (hash>>5) ^ RtlDowncaseUnicodeChar(*p); /* Last character */
     }
     else
     {
@@ -2245,29 +2245,24 @@ static int match_redirect( const WCHAR *path, int len, const WCHAR *redir, BOOLE
 {
     int i = 0;
 
-    while (i < len && *redir)
+    while (i < len)
     {
-        if (IS_SEPARATOR(path[i]))
+        int start = i;
+        while (i < len && !IS_SEPARATOR(path[i])) i++;
+        if (check_case)
         {
-            if (*redir++ != '\\') return 0;
-            while (i < len && IS_SEPARATOR(path[i])) i++;
-            continue;  /* move on to next path component */
-        }
-        else if (check_case)
-        {
-            if (path[i] != *redir) return 0;
+            if (strncmpW( path + start, redir, i - start )) return 0;
         }
         else
         {
-            if (tolowerW(path[i]) != tolowerW(*redir)) return 0;
+            if (wcsnicmp( path + start, redir, i - start )) return 0;
         }
-        i++;
-        redir++;
+        redir += i - start;
+        while (i < len && IS_SEPARATOR(path[i])) i++;
+        if (!*redir) return i;
+        if (*redir++ != '\\') return 0;
     }
-    if (*redir) return 0;
-    if (i < len && !IS_SEPARATOR(path[i])) return 0;
-    while (i < len && IS_SEPARATOR(path[i])) i++;
-    return i;
+    return 0;
 }
 
 
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 8f607409f5..0e2e3f7dd1 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -1749,16 +1749,17 @@ static BOOL get_builtin_fullname( UNICODE_STRING *nt_name, const UNICODE_STRING
 {
     static const WCHAR nt_prefixW[] = {'\\','?','?','\\',0};
     static const WCHAR soW[] = {'.','s','o',0};
-    WCHAR *p, *fullname;
-    size_t i, len = strlen(filename);
+    WCHAR *p, *fullname, filenameW[256];
+    size_t len = strlen(filename);
+
+    if (len >= ARRAY_SIZE(filenameW)) return FALSE;
+    ascii_to_unicode( filenameW, filename, len + 1 );
 
     /* check if path can correspond to the dll we have */
     if (path && (p = strrchrW( path->Buffer, '\\' )))
     {
         p++;
-        for (i = 0; i < len; i++)
-            if (tolowerW(p[i]) != tolowerW( (WCHAR)filename[i]) ) break;
-        if (i == len && (!p[len] || !wcsicmp( p + len, soW )))
+        if (!wcsnicmp( p, filenameW, len ) && (!p[len] || !wcsicmp( p + len, soW )))
         {
             /* the filename matches, use path as the full path */
             len += p - path->Buffer;
@@ -1775,7 +1776,7 @@ static BOOL get_builtin_fullname( UNICODE_STRING *nt_name, const UNICODE_STRING
         return FALSE;
     strcpyW( fullname, nt_prefixW );
     strcatW( fullname, system_dir );
-    ascii_to_unicode( fullname + strlenW(fullname), filename, len + 1 );
+    strcatW( fullname, filenameW );
 done:
     RtlInitUnicodeString( nt_name, fullname );
     return TRUE;
diff --git a/dlls/ntdll/locale.c b/dlls/ntdll/locale.c
index 915a644c9d..0969037078 100644
--- a/dlls/ntdll/locale.c
+++ b/dlls/ntdll/locale.c
@@ -1496,7 +1496,9 @@ NTSTATUS WINAPI RtlUnicodeToOemN( char *dst, DWORD dstlen, DWORD *reslen,
  */
 WCHAR WINAPI RtlDowncaseUnicodeChar( WCHAR wch )
 {
-    return casemap( nls_info.LowerCaseTable, wch );
+    if (nls_info.LowerCaseTable) return casemap( nls_info.LowerCaseTable, wch );
+    if (wch >= 'A' && wch <= 'Z') wch += 'a' - 'A';
+    return wch;
 }