[PATCH 2/2] dwrite: Properly truncate face name to LOGFONT size.

[Nikolay Sivov]

Signed-off-by: Nikolay Sivov 
---

Bahnschrift font introduced in Windows 10 1803 demonstrates this issue.

dlls/dwrite/opentype.c   | 15 +++++++++++++--
 dlls/dwrite/tests/font.c |  9 +++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/dlls/dwrite/opentype.c b/dlls/dwrite/opentype.c
index b95083e33a..db44368b2f 100644
--- a/dlls/dwrite/opentype.c
+++ b/dlls/dwrite/opentype.c
@@ -1736,8 +1736,19 @@ HRESULT opentype_get_font_facename(struct file_stream_desc *stream_desc, WCHAR *
         if (!exists)
             IDWriteLocalizedStrings_FindLocaleName(lfnames, enusW, &index, &exists);

-        if (exists)
-            IDWriteLocalizedStrings_GetString(lfnames, index, lfname, LF_FACESIZE);
+        if (exists) {
+            UINT32 length = 0;
+            WCHAR *nameW;
+
+            IDWriteLocalizedStrings_GetStringLength(lfnames, index, &length);
+            nameW = heap_alloc((length + 1) * sizeof(WCHAR));
+            if (nameW) {
+                *nameW = 0;
+                IDWriteLocalizedStrings_GetString(lfnames, index, nameW, length + 1);
+                lstrcpynW(lfname, nameW, LF_FACESIZE);
+                heap_free(nameW);
+            }
+        }

IDWriteLocalizedStrings_Release(lfnames);
     }
diff --git a/dlls/dwrite/tests/font.c b/dlls/dwrite/tests/font.c
index db9949faac..f23bfcc63b 100644
--- a/dlls/dwrite/tests/font.c
+++ b/dlls/dwrite/tests/font.c
@@ -2515,6 +2515,7 @@ static void get_logfont_from_font(IDWriteFont *font, LOGFONTW *logfont)
         if (exists) {
             static const WCHAR enusW[] = {'e','n','-','u','s',0};
             WCHAR localeW[LOCALE_NAME_MAX_LENGTH];
+            WCHAR nameW[256];
             UINT32 index;

/* Fallback to en-us if there's no string for user locale. */
@@ -2525,8 +2526,12 @@ static void get_logfont_from_font(IDWriteFont *font, LOGFONTW *logfont)
             if (!exists)
                 IDWriteLocalizedStrings_FindLocaleName(names, enusW, &index, &exists);

-            if (exists)
-                IDWriteLocalizedStrings_GetString(names, index, logfont->lfFaceName, ARRAY_SIZE(logfont->lfFaceName));
+            if (exists) {
+                nameW[0] = 0;
+                hr = IDWriteLocalizedStrings_GetString(names, index, nameW, ARRAY_SIZE(nameW));
+                ok(hr == S_OK, "Failed to get name string, hr %#x.\n", hr);
+                lstrcpynW(logfont->lfFaceName, nameW, ARRAY_SIZE(logfont->lfFaceName));
+            }
         }

IDWriteLocalizedStrings_Release(names);