Jacek Caban : winex11: Use a simple sdbm hash implementation in X11DRV_GetICMProfile.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f1fb42ac4d4924beba3e5d48cf76132a2bbbaecc
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=f1fb42ac4d4924beba3e5d48cf76132a2bbbaecc

Author: Jacek Caban <jacek at codeweavers.com>
Date:   Fri Apr 22 14:46:31 2022 +0200

winex11: Use a simple sdbm hash implementation in X11DRV_GetICMProfile.

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
Signed-off-by: Huw Davies <huw at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/winex11.drv/graphics.c | 39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/dlls/winex11.drv/graphics.c b/dlls/winex11.drv/graphics.c
index 4dafb5a339b..dadedf2d9cf 100644
--- a/dlls/winex11.drv/graphics.c
+++ b/dlls/winex11.drv/graphics.c
@@ -1621,12 +1621,13 @@ fallback:
     return dev->funcs->pGradientFill( dev, vert_array, nvert, grad_array, ngrad, mode );
 }
 
-static unsigned char *get_icm_profile( unsigned long *size )
+static char *get_icm_profile( unsigned long *size )
 {
     Atom type;
     int format;
     unsigned long count, remaining;
-    unsigned char *profile, *ret = NULL;
+    unsigned char *profile;
+    char *ret = NULL;
 
     XGetWindowProperty( gdi_display, DefaultRootWindow(gdi_display),
                         x11drv_atom(_ICC_PROFILE), 0, ~0UL, False, AnyPropertyType,
@@ -1674,15 +1675,15 @@ BOOL CDECL X11DRV_GetICMProfile( PHYSDEV dev, BOOL allow_default, LPDWORD size,
     DWORD required;
     char buf[4096];
     KEY_VALUE_FULL_INFORMATION *info = (void *)buf;
-    unsigned char *buffer;
-    unsigned long buflen;
+    char *buffer;
+    unsigned long buflen, i;
     ULONG full_size;
-    WCHAR profile[MAX_PATH], fullname[MAX_PATH + ARRAY_SIZE( color_path )];
+    WCHAR fullname[MAX_PATH + ARRAY_SIZE( color_path )], *p;
 
     if (!size) return FALSE;
 
     memcpy( fullname, color_path, sizeof(color_path) );
-    fullname[ARRAYSIZE(color_path)] = 0;
+    p = fullname + ARRAYSIZE(color_path);
 
     hkey = reg_open_key( NULL, mntr_key, sizeof(mntr_key) );
 
@@ -1690,27 +1691,25 @@ BOOL CDECL X11DRV_GetICMProfile( PHYSDEV dev, BOOL allow_default, LPDWORD size,
                                       info, sizeof(buf), &full_size ))
     {
         /* FIXME handle multiple values */
-        memcpy( fullname + ARRAYSIZE(color_path), info->Name, info->NameLength );
-        fullname[ARRAYSIZE(color_path) + info->NameLength / sizeof(WCHAR)] = 0;
+        memcpy( p, info->Name, info->NameLength );
+        p[info->NameLength / sizeof(WCHAR)] = 0;
     }
     else if ((buffer = get_icm_profile( &buflen )))
     {
-        static const WCHAR fmt[] = {'%','0','2','x',0};
         static const WCHAR icm[] = {'.','i','c','m',0};
-
-        unsigned char sha1sum[20];
-        unsigned int i;
-        sha_ctx ctx;
+        UINT64 hash = 0;
         HANDLE file;
 
-        A_SHAInit( &ctx );
-        A_SHAUpdate( &ctx, buffer, buflen );
-        A_SHAFinal( &ctx, sha1sum );
+        for (i = 0; i < buflen; i++) hash = (hash << 16) - hash + buffer[i];
+        for (i = 0; i < sizeof(hash) * 2; i++)
+        {
+            int digit = hash & 0xf;
+            p[i] = digit < 10 ? '0' + digit : 'a' - 10 + digit;
+            hash >>= 4;
+        }
 
-        for (i = 0; i < sizeof(sha1sum); i++) sprintfW( &profile[i * 2], fmt, sha1sum[i] );
-        memcpy( &profile[i * 2], icm, sizeof(icm) );
+        memcpy( p + i, icm, sizeof(icm) );
 
-        strcatW( fullname, profile );
         file = CreateFileW( fullname, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, 0 );
         if (file != INVALID_HANDLE_VALUE)
         {
@@ -1723,7 +1722,7 @@ BOOL CDECL X11DRV_GetICMProfile( PHYSDEV dev, BOOL allow_default, LPDWORD size,
         HeapFree( GetProcessHeap(), 0, buffer );
     }
     else if (!allow_default) return FALSE;
-    else strcatW( fullname, srgb );
+    else lstrcpyW( p, srgb );
 
     NtClose( hkey );
     required = strlenW( fullname ) + 1;