mirror of
https://github.com/upx/upx
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456 lines
12 KiB
C++
456 lines
12 KiB
C++
/* filteri.cpp -- filter implementation (low-level)
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This file is part of the UPX executable compressor.
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Copyright (C) 1996-2000 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1996-2000 Laszlo Molnar
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UPX and the UCL library are free software; you can redistribute them
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and/or modify them under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer Laszlo Molnar
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markus.oberhumer@jk.uni-linz.ac.at ml1050@cdata.tvnet.hu
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*/
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#include "conf.h"
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#include "filter.h"
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#define set_dummy(p, v) ((void)0)
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/*************************************************************************
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// 16-bit calltrick ("naive")
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**************************************************************************/
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#define CT16(f, cond, addvalue, get, set) \
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upx_byte *b = f->buf; \
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upx_byte *b_end = b + f->buf_len - 3; \
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do { \
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if (cond) \
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{ \
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b += 1; \
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unsigned a = (unsigned) (b - f->buf); \
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f->lastcall = a; \
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set(b, get(b) + (addvalue)); \
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f->calls++; \
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b += 2 - 1; \
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} \
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} while (++b < b_end); \
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if (f->lastcall) f->lastcall += 2; \
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return 0;
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// filter: e8, e9, e8e9
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static int f_ct16_e8(Filter *f)
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{
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CT16(f, (*b == 0xe8), a + f->addvalue, get_le16, set_le16)
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}
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static int f_ct16_e9(Filter *f)
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{
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CT16(f, (*b == 0xe9), a + f->addvalue, get_le16, set_le16)
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}
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static int f_ct16_e8e9(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_le16, set_le16)
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}
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// unfilter: e8, e9, e8e9
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static int u_ct16_e8(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_le16, set_le16)
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}
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static int u_ct16_e9(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_le16, set_le16)
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}
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static int u_ct16_e8e9(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le16, set_le16)
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}
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// scan: e8, e9, e8e9
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static int s_ct16_e8(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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static int s_ct16_e9(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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static int s_ct16_e8e9(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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// filter: e8, e9, e8e9 with bswap le->be
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static int f_ct16_e8_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8), a + f->addvalue, get_le16, set_be16)
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}
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static int f_ct16_e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe9), a + f->addvalue, get_le16, set_be16)
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}
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static int f_ct16_e8e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_le16, set_be16)
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}
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// unfilter: e8, e9, e8e9 with bswap le->be
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static int u_ct16_e8_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_be16, set_le16)
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}
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static int u_ct16_e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_be16, set_le16)
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}
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static int u_ct16_e8e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_be16, set_le16)
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}
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// scan: e8, e9, e8e9 with bswap le->be
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static int s_ct16_e8_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_be16, set_dummy)
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}
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static int s_ct16_e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_be16, set_dummy)
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}
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static int s_ct16_e8e9_bswap_le(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_be16, set_dummy)
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}
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// filter: e8, e9, e8e9 with bswap be->le
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static int f_ct16_e8_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8), a + f->addvalue, get_be16, set_le16)
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}
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static int f_ct16_e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe9), a + f->addvalue, get_be16, set_le16)
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}
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static int f_ct16_e8e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_be16, set_le16)
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}
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// unfilter: e8, e9, e8e9 with bswap be->le
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static int u_ct16_e8_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_le16, set_be16)
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}
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static int u_ct16_e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_le16, set_be16)
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}
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static int u_ct16_e8e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le16, set_be16)
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}
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// scan: e8, e9, e8e9 with bswap be->le
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static int s_ct16_e8_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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static int s_ct16_e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe9), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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static int s_ct16_e8e9_bswap_be(Filter *f)
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{
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CT16(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le16, set_dummy)
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}
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#undef CT16
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/*************************************************************************
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// 32-bit calltrick ("naive")
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**************************************************************************/
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#define CT32(f, cond, addvalue, get, set) \
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upx_byte *b = f->buf; \
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upx_byte *b_end = b + f->buf_len - 5; \
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do { \
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if (cond) \
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{ \
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b += 1; \
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unsigned a = (unsigned) (b - f->buf); \
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f->lastcall = a; \
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set(b, get(b) + (addvalue)); \
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f->calls++; \
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b += 4 - 1; \
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} \
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} while (++b < b_end); \
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if (f->lastcall) f->lastcall += 4; \
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return 0;
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// filter: e8, e9, e8e9
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static int f_ct32_e8(Filter *f)
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{
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CT32(f, (*b == 0xe8), a + f->addvalue, get_le32, set_le32)
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}
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static int f_ct32_e9(Filter *f)
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{
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CT32(f, (*b == 0xe9), a + f->addvalue, get_le32, set_le32)
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}
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static int f_ct32_e8e9(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_le32, set_le32)
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}
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// unfilter: e8, e9, e8e9
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static int u_ct32_e8(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_le32, set_le32)
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}
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static int u_ct32_e9(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_le32, set_le32)
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}
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static int u_ct32_e8e9(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le32, set_le32)
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}
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// scan: e8, e9, e8e9
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static int s_ct32_e8(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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static int s_ct32_e9(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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static int s_ct32_e8e9(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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// filter: e8, e9, e8e9 with bswap le->be
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static int f_ct32_e8_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8), a + f->addvalue, get_le32, set_be32)
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}
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static int f_ct32_e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe9), a + f->addvalue, get_le32, set_be32)
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}
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static int f_ct32_e8e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_le32, set_be32)
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}
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// unfilter: e8, e9, e8e9 with bswap le->be
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static int u_ct32_e8_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_be32, set_le32)
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}
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static int u_ct32_e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_be32, set_le32)
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}
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static int u_ct32_e8e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_be32, set_le32)
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}
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// scan: e8, e9, e8e9 with bswap le->be
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static int s_ct32_e8_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_be32, set_dummy)
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}
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static int s_ct32_e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_be32, set_dummy)
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}
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static int s_ct32_e8e9_bswap_le(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_be32, set_dummy)
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}
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// filter: e8, e9, e8e9 with bswap be->le
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static int f_ct32_e8_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8), a + f->addvalue, get_be32, set_le32)
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}
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static int f_ct32_e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe9), a + f->addvalue, get_be32, set_le32)
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}
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static int f_ct32_e8e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), a + f->addvalue, get_be32, set_le32)
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}
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// unfilter: e8, e9, e8e9 with bswap be->le
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static int u_ct32_e8_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_le32, set_be32)
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}
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static int u_ct32_e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_le32, set_be32)
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}
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static int u_ct32_e8e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le32, set_be32)
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}
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// scan: e8, e9, e8e9 with bswap be->le
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static int s_ct32_e8_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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static int s_ct32_e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe9), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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static int s_ct32_e8e9_bswap_be(Filter *f)
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{
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CT32(f, (*b == 0xe8 || *b == 0xe9), 0 - a - f->addvalue, get_le32, set_dummy)
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}
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#undef CT32
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#undef set_dummy
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/*************************************************************************
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// 32-bit calltrick with cto ("clever")
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//
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// This version is more sophisticated because it only
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// tries to change actual calls and/or jumps.
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**************************************************************************/
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#if 1
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// use Laszlo's implementation
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#include "fcto_ml.ch"
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#else
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// use Marco's implementation
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#include "fcto_mfx.ch"
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#endif
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/*************************************************************************
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// database for use in class Filter
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**************************************************************************/
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const FilterImp::FilterEntry FilterImp::filters[] = {
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// no filter
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{ 0x00, 0, 0, NULL, NULL, NULL },
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// 16-bit calltrick
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{ 0x01, 4, 0, f_ct16_e8, u_ct16_e8, s_ct16_e8,},
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{ 0x02, 4, 0, f_ct16_e9, u_ct16_e9, s_ct16_e9 },
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{ 0x03, 4, 0, f_ct16_e8e9, u_ct16_e8e9, s_ct16_e8e9 },
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{ 0x04, 4, 0, f_ct16_e8_bswap_le, u_ct16_e8_bswap_le, s_ct16_e8_bswap_le },
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{ 0x05, 4, 0, f_ct16_e9_bswap_le, u_ct16_e9_bswap_le, s_ct16_e9_bswap_le },
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{ 0x06, 4, 0, f_ct16_e8e9_bswap_le, u_ct16_e8e9_bswap_le, s_ct16_e8e9_bswap_le },
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{ 0x07, 4, 0, f_ct16_e8_bswap_be, u_ct16_e8_bswap_be, s_ct16_e8_bswap_be },
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{ 0x08, 4, 0, f_ct16_e9_bswap_be, u_ct16_e9_bswap_be, s_ct16_e9_bswap_be },
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{ 0x09, 4, 0, f_ct16_e8e9_bswap_be, u_ct16_e8e9_bswap_be, s_ct16_e8e9_bswap_be },
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// 32-bit calltrick
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{ 0x11, 6, 0, f_ct32_e8, u_ct32_e8, s_ct32_e8 },
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{ 0x12, 6, 0, f_ct32_e9, u_ct32_e9, s_ct32_e9 },
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{ 0x13, 6, 0, f_ct32_e8e9, u_ct32_e8e9, s_ct32_e8e9 },
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{ 0x14, 6, 0, f_ct32_e8_bswap_le, u_ct32_e8_bswap_le, s_ct32_e8_bswap_le },
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{ 0x15, 6, 0, f_ct32_e9_bswap_le, u_ct32_e9_bswap_le, s_ct32_e9_bswap_le },
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{ 0x16, 6, 0, f_ct32_e8e9_bswap_le, u_ct32_e8e9_bswap_le, s_ct32_e8e9_bswap_le },
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{ 0x17, 6, 0, f_ct32_e8_bswap_be, u_ct32_e8_bswap_be, s_ct32_e8_bswap_be },
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{ 0x18, 6, 0, f_ct32_e9_bswap_be, u_ct32_e9_bswap_be, s_ct32_e9_bswap_be },
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{ 0x19, 6, 0, f_ct32_e8e9_bswap_be, u_ct32_e8e9_bswap_be, s_ct32_e8e9_bswap_be },
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// 32-bit cto calltrick
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{ 0x21, 6, 0x00ffffff, f_cto32_e8, u_cto32_e8, s_cto32_e8 },
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{ 0x22, 6, 0x00ffffff, f_cto32_e9, u_cto32_e9, s_cto32_e9 },
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{ 0x23, 6, 0x00ffffff, f_cto32_e8e9, u_cto32_e8e9, s_cto32_e8e9 },
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{ 0x24, 6, 0x00ffffff, f_cto32_e8_bswap_le, u_cto32_e8_bswap_le, s_cto32_e8_bswap_le },
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{ 0x25, 6, 0x00ffffff, f_cto32_e9_bswap_le, u_cto32_e9_bswap_le, s_cto32_e9_bswap_le },
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{ 0x26, 6, 0x00ffffff, f_cto32_e8e9_bswap_le, u_cto32_e8e9_bswap_le, s_cto32_e8e9_bswap_le },
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{ 0x27, 6, 0x00ffffff, f_cto32_e8_bswap_be, u_cto32_e8_bswap_be, s_cto32_e8_bswap_be },
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{ 0x28, 6, 0x00ffffff, f_cto32_e9_bswap_be, u_cto32_e9_bswap_be, s_cto32_e9_bswap_be },
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{ 0x29, 6, 0x00ffffff, f_cto32_e8e9_bswap_be, u_cto32_e8e9_bswap_be, s_cto32_e8e9_bswap_be },
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};
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const int FilterImp::n_filters = HIGH(filters);
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/*
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vi:ts=4:et:nowrap
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*/
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