Support files with UTF8BOM character

StandAlone/StandAlone.cpp

@@ -2167,6 +2167,20 @@ char* ReadFileData(const char* fileName)
 
     fseek(in, 0, SEEK_SET);
 
+    if (count > 3) {
+        unsigned char head[3];
+        if (fread(head, 1, 3, in) == 3) {
+            if (head[0] == 0xef && head[1] == 0xbb && head[2] == 0xbf) {
+                // skip BOM
+                count -= 3;
+            } else {
+                fseek(in, 0, SEEK_SET);
+            }
+        } else {
+            Error("can't read input file");
+        }
+    }
+
     char* return_data = (char*)malloc(count + 1);  // freed in FreeFileData()
     if ((int)fread(return_data, 1, count, in) != count) {
         free(return_data);

Test/UTF8BOM.vert

@@ -0,0 +1,11 @@
+/*
+
+glslangValidator.exe --glsl-version 410 -V -S vert -o UTF8BOM.vert.out UTF8BOM.vert
+
+*/
+
+#version 110
+
+void main()
+{
+}

Test/baseResults/UTF8BOM.vert.out

@@ -0,0 +1 @@
+UTF8BOM.vert

Test/runtests

@@ -348,6 +348,13 @@ diff -b $BASEDIR/enhanced.7.link.out "$TARGETDIR/enhanced.7.link.out" || HASERRO
 run --enhanced-msgs -V --target-env vulkan1.2 --amb --aml spv.textureError.frag > "$TARGETDIR/spv.textureError.frag.out"
 diff -b $BASEDIR/spv.textureError.frag.out "$TARGETDIR/spv.textureError.frag.out" || HASERROR=1
 
+#
+# Test UTF8BOM
+#
+echo "Testing UTF8BOM"
+run --glsl-version 410 -V -S vert UTF8BOM.vert > $TARGETDIR/UTF8BOM.vert.out
+diff -b $BASEDIR/UTF8BOM.vert.out $TARGETDIR/UTF8BOM.vert.out || HASERROR=1
+
 #
 # Final checking
 #