100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/* packhead.h --
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This file is part of the UPX executable compressor.
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Copyright (C) 1996-2023 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1996-2023 Laszlo Molnar
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All Rights Reserved.
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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.com> <ezerotven+github@gmail.com>
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*/
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#pragma once
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class Filter;
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/*************************************************************************
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// PackHeader
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// also see stub/src/include/header.S
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**************************************************************************/
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class PackHeader final {
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public:
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explicit PackHeader() noexcept;
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~PackHeader() noexcept = default;
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void putPackHeader(SPAN_S(byte) p) const;
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bool decodePackHeaderFromBuf(SPAN_S(const byte) b, int blen);
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int getPackHeaderSize() const;
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// fields stored in compressed file => see header.S
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// enum { magic = UPX_MAGIC_LE32 };
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int version;
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int format; // executable format
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int method; // compresison method
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int level; // compresison level 1..10
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unsigned u_len;
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unsigned c_len;
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unsigned u_adler;
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unsigned c_adler;
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unsigned u_file_size;
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int filter;
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int filter_cto;
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int n_mru; // FIXME: rename to filter_misc
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int header_checksum;
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// support fields for verifying decompression
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unsigned saved_u_adler;
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unsigned saved_c_adler;
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// info fields set by decodePackHeaderFromBuf()
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unsigned buf_offset;
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// info fields set by Packer::compress()
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upx_compress_result_t compress_result;
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// unsigned min_offset_found;
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unsigned max_offset_found;
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// unsigned min_match_found;
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unsigned max_match_found;
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// unsigned min_run_found;
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unsigned max_run_found;
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unsigned first_offset_found;
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// unsigned same_match_offsets_found;
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// info fields set by Packer::compressWithFilters()
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unsigned overlap_overhead;
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};
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/*************************************************************************
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// ph default util functions
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**************************************************************************/
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bool ph_is_forced_method(int method) noexcept; // predicate
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int ph_force_method(int method) noexcept; // (0x80ul<<24)|method
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int ph_forced_method(int method) noexcept; // (0x80ul<<24)|method ==> method
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bool ph_skipVerify(const PackHeader &ph) noexcept;
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void ph_decompress(PackHeader &ph, SPAN_P(const byte) in, SPAN_P(byte) out, bool verify_checksum,
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Filter *ft);
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bool ph_testOverlappingDecompression(const PackHeader &ph, const byte *buf, const byte *tbuf,
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unsigned overlap_overhead);
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