forcepoint #7 check ksc5601_2uni_page21 bounds

Change-Id: I578e7a63bb50f2088d35174d88f075c00469bad3
Reviewed-on: https://gerrit.libreoffice.org/50287Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit bdf30af5)

hwpfilter/source/hcode.cxx

@@ -1139,14 +1139,11 @@ int kssm_hangul_to_ucs2(hchar ch, hchar *dest)
 hchar ksc5601_sym_to_ucs2 (hchar input)
 {
     unsigned char ch = sal::static_int_cast<unsigned char>(input >> 8);
-    unsigned char ch2;
-    int idx;
-
-    ch2 = sal::static_int_cast<unsigned char>(input & 0xff);
-    idx = (ch - 0xA1) * 94 + (ch2 - 0xA1);
-    if (idx <= 1114 && idx >= 0){
-    hchar value = ksc5601_2uni_page21[idx];
-    return value ? value :  0x25a1;
+    unsigned char ch2 = sal::static_int_cast<unsigned char>(input & 0xff);
+    int idx = (ch - 0xA1) * 94 + (ch2 - 0xA1);
+    if (idx >= 0 && idx < static_cast<int>(SAL_N_ELEMENTS(ksc5601_2uni_page21))) {
+        hchar value = ksc5601_2uni_page21[idx];
+        return value ? value :  0x25a1;
     }
     return 0x25a1;
 }
@@ -1154,15 +1151,12 @@ hchar ksc5601_sym_to_ucs2 (hchar input)
 hchar ksc5601_han_to_ucs2 (hchar input)
 {
     unsigned char ch = sal::static_int_cast<unsigned char>(input >> 8);
-    unsigned char ch2;
-    int idx;
-
-    ch2 = sal::static_int_cast<unsigned char>(input & 0xff);
-    idx = (ch - 0xA1) * 94 + (ch2 - 0xA1);
-    if (idx >= 3854){
-    // Hanja : row 42 - row 93 : 3854 = 94 * (42-1)
-    hchar value = ksc5601_2uni_page21[idx - 3854];
-    return value ? value : '?';
+    unsigned char ch2 = sal::static_int_cast<unsigned char>(input & 0xff);
+    int idx = (ch - 0xA1) * 94 + (ch2 - 0xA1);
+    if (idx >= 3854 && idx < static_cast<int>(3854 + SAL_N_ELEMENTS(ksc5601_2uni_page21))) {
+        // Hanja : row 42 - row 93 : 3854 = 94 * (42-1)
+        hchar value = ksc5601_2uni_page21[idx - 3854];
+        return value ? value : '?';
     }
     return '?';
 }