Moved the actual filter implementations into the new filter directory.

committer: mfx <mfx> 978622245 +0000
2001-01-04 15:30:45 +00:00
parent 595afd8964
commit 794d048bf2
7 changed files with 798 additions and 778 deletions
@@ -0,0 +1,188 @@
+/* sw.h -- swaptrick filter
+
+   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@jk.uni-linz.ac.at        ml1050@cdata.tvnet.hu
+ */
+
+
+
+/*************************************************************************
+// 16-bit swaptrick ("naive")
+**************************************************************************/
+
+#define SW16(f, cond, get, set) \
+    upx_byte *b = f->buf; \
+    upx_byte *b_end = b + f->buf_len - 3; \
+    do { \
+        if (cond) \
+        { \
+            b += 1; \
+            unsigned a = (unsigned) (b - f->buf); \
+            f->lastcall = a; \
+            set(b, get(b)); \
+            f->calls++; \
+            b += 2 - 1; \
+        } \
+    } while (++b < b_end); \
+    if (f->lastcall) f->lastcall += 2; \
+    return 0;
+
+
+// filter
+static int f_sw16_e8(Filter *f)
+{
+    SW16(f, (*b == 0xe8), get_le16, set_be16)
+}
+
+static int f_sw16_e9(Filter *f)
+{
+    SW16(f, (*b == 0xe9), get_le16, set_be16)
+}
+
+static int f_sw16_e8e9(Filter *f)
+{
+    SW16(f, (*b == 0xe8 || *b == 0xe9), get_le16, set_be16)
+}
+
+
+// unfilter
+static int u_sw16_e8(Filter *f)
+{
+    SW16(f, (*b == 0xe8), get_be16, set_le16)
+}
+
+static int u_sw16_e9(Filter *f)
+{
+    SW16(f, (*b == 0xe9), get_be16, set_le16)
+}
+
+static int u_sw16_e8e9(Filter *f)
+{
+    SW16(f, (*b == 0xe8 || *b == 0xe9), get_be16, set_le16)
+}
+
+
+// scan
+static int s_sw16_e8(Filter *f)
+{
+    SW16(f, (*b == 0xe8), get_le16, set_dummy)
+}
+
+static int s_sw16_e9(Filter *f)
+{
+    SW16(f, (*b == 0xe9), get_le16, set_dummy)
+}
+
+static int s_sw16_e8e9(Filter *f)
+{
+    SW16(f, (*b == 0xe8 || *b == 0xe9), get_le16, set_dummy)
+}
+
+
+#undef SW16
+
+
+
+
+/*************************************************************************
+// 32-bit swaptrick ("naive")
+**************************************************************************/
+
+#define SW32(f, cond, get, set) \
+    upx_byte *b = f->buf; \
+    upx_byte *b_end = b + f->buf_len - 5; \
+    do { \
+        if (cond) \
+        { \
+            b += 1; \
+            unsigned a = (unsigned) (b - f->buf); \
+            f->lastcall = a; \
+            set(b, get(b)); \
+            f->calls++; \
+            b += 4 - 1; \
+        } \
+    } while (++b < b_end); \
+    if (f->lastcall) f->lastcall += 4; \
+    return 0;
+
+
+// filter
+static int f_sw32_e8(Filter *f)
+{
+    SW32(f, (*b == 0xe8), get_le32, set_be32)
+}
+
+static int f_sw32_e9(Filter *f)
+{
+    SW32(f, (*b == 0xe9), get_le32, set_be32)
+}
+
+static int f_sw32_e8e9(Filter *f)
+{
+    SW32(f, (*b == 0xe8 || *b == 0xe9), get_le32, set_be32)
+}
+
+
+// unfilter
+static int u_sw32_e8(Filter *f)
+{
+    SW32(f, (*b == 0xe8), get_be32, set_le32)
+}
+
+static int u_sw32_e9(Filter *f)
+{
+    SW32(f, (*b == 0xe9), get_be32, set_le32)
+}
+
+static int u_sw32_e8e9(Filter *f)
+{
+    SW32(f, (*b == 0xe8 || *b == 0xe9), get_be32, set_le32)
+}
+
+
+// scan
+static int s_sw32_e8(Filter *f)
+{
+    SW32(f, (*b == 0xe8), get_le32, set_dummy)
+}
+
+static int s_sw32_e9(Filter *f)
+{
+    SW32(f, (*b == 0xe9), get_le32, set_dummy)
+}
+
+static int s_sw32_e8e9(Filter *f)
+{
+    SW32(f, (*b == 0xe8 || *b == 0xe9), get_le32, set_dummy)
+}
+
+
+#undef SW32
+
+
+
+/*
+vi:ts=4:et:nowrap
+*/
+