Added util function getcto().

committer: mfx <mfx> 978792675 +0000
2001-01-06 14:51:15 +00:00
parent 766b3edeee
commit daa0fe353b
7 changed files with 103 additions and 135 deletions
@@ -0,0 +1,75 @@
+/* getcto.h -- calltrick util
+
+   This file is part of the UPX executable compressor.
+
+   Copyright (C) 1996-2001 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1996-2001 Laszlo Molnar
+   All Rights Reserved.
+
+   UPX and the UCL library are free software; you can redistribute them
+   and/or modify them under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of
+   the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Markus F.X.J. Oberhumer   Laszlo Molnar
+   markus@oberhumer.com      ml1050@cdata.tvnet.hu
+ */
+
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+static int getcto(Filter *f, const unsigned char *buf, const int n=256)
+{
+    int ic = n;
+
+    if (f->preferred_ctos)
+    {
+        for (const int *pc = f->preferred_ctos; *pc >= 0; pc++)
+        {
+            if (*pc < n && buf[*pc] == 0)
+            {
+                ic = *pc;
+                break;
+            }
+        }
+    }
+
+#if 0
+    // just a test to see if certain ctos would improve compression
+    if (ic >= n)
+        for (ic = 0; ic < n; ic += 16)
+            if (buf[ic] == 0)
+                break;
+#endif
+    if (ic >= n)
+        for (ic = 0; ic < n; ic++)
+            if (buf[ic] == 0)
+                break;
+
+    if (ic >= n)
+        //throwCantPack("call trick problem");
+        return -1;
+
+    f->cto = (unsigned char) ic;
+    return ic;
+}
+
+
+
+/*
+vi:ts=4:et:nowrap
+*/
+