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/* p_unix.h --
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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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#ifndef __UPX_P_UNIX_H
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#define __UPX_P_UNIX_H
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/*************************************************************************
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// Abstract class for all Unix-type packers.
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// Already provides most of the functionality.
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**************************************************************************/
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class PackUnix : public Packer
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{
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typedef Packer super;
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protected:
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PackUnix(InputFile *f);
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public:
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virtual int getVersion() const { return 11; }
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virtual const int *getFilters() const { return NULL; }
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virtual void pack(OutputFile *fo);
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virtual void unpack(OutputFile *fo);
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virtual bool canPack();
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virtual bool canUnpack();
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protected:
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// called by the generic pack()
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virtual void patchLoader() = 0;
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virtual void patchLoaderChecksum() {}
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// in order too share as much code as possible we introduce
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// an endian abstraction here
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virtual unsigned get_native32(const void *, int off=0) = 0;
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virtual void set_native32(void *, unsigned, int off=0) = 0;
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virtual bool checkCompressionRatio(unsigned, unsigned) const;
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int exetype;
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unsigned blocksize;
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unsigned progid; // program id
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unsigned overlay_offset; // used when decompressing
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MemBuffer loader;
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int lsize;
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struct l_info { // 12-byte trailer in header for loader
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unsigned l_checksum;
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unsigned l_magic;
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unsigned short l_lsize;
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unsigned char l_version;
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unsigned char l_format;
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};
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struct p_info { // 12-byte packed program header
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unsigned p_progid;
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unsigned p_filesize;
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unsigned p_blocksize;
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};
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// do not change !!!
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enum { OVERHEAD = 2048 };
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};
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/*************************************************************************
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// abstract classes encapsulating endian issues
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// note: UPX_MAGIC is always stored in le32 format
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**************************************************************************/
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class PackUnixBe32 : public PackUnix
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{
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typedef PackUnix super;
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protected:
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PackUnixBe32(InputFile *f) : super(f) { }
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virtual unsigned get_native32(const void * b, int off=0)
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{
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return get_be32(b, off);
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}
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virtual void set_native32(void * b, unsigned v, int off=0)
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{
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set_be32(b, v, off);
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}
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};
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class PackUnixLe32 : public PackUnix
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{
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typedef PackUnix super;
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protected:
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PackUnixLe32(InputFile *f) : super(f) { }
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virtual unsigned get_native32(const void * b, int off=0)
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{
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return get_le32(b, off);
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}
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virtual void set_native32(void * b, unsigned v, int off=0)
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{
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set_le32(b, v, off);
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}
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};
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/*************************************************************************
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// linux/i386 (execve format)
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**************************************************************************/
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class PackLinuxI386 : public PackUnixLe32
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{
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typedef PackUnixLe32 super;
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public:
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PackLinuxI386(InputFile *f) : super(f) { }
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virtual int getFormat() const { return UPX_F_LINUX_i386; }
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virtual const char *getName() const { return "linux/386"; }
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virtual int getCompressionMethod() const;
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virtual bool canPack();
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protected:
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virtual const upx_byte *getLoader() const;
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virtual int getLoaderSize() const;
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virtual int getLoaderPrefixSize() const;
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virtual void patchLoader();
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virtual void patchLoaderChecksum();
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enum {
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UPX_ELF_MAGIC = 0x5850557f // "\x7fUPX"
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};
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};
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/*************************************************************************
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// bvmlinux/i386 (Linux kernel image)
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// vmlinux/i386 (Linux kernel image)
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**************************************************************************/
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class PackBvmlinuxI386 : public Packer
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{
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typedef Packer super;
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public:
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PackBvmlinuxI386(InputFile *f);
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virtual int getVersion() const { return 11; }
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virtual int getFormat() const { return UPX_F_BVMLINUX_i386; }
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virtual const char *getName() const { return "bvmlinux/386"; }
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virtual int getCompressionMethod() const;
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virtual const int *getFilters() const { return NULL; }
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virtual void pack(OutputFile *fo);
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virtual void unpack(OutputFile *fo);
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virtual bool canPack();
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virtual bool canUnpack();
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protected:
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// virtual const upx_byte *getLoader() const;
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// virtual int getLoaderSize() const;
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unsigned elf_offset;
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};
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/*************************************************************************
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// solaris/sparc
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**************************************************************************/
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#if 0
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class PackSolarisSparc : public PackUnixBe32
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{
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typedef PackUnixBe32 super;
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public:
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PackSolarisSparc(InputFile *f) : super(f) { }
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virtual int getFormat() const { return UPX_F_SOLARIS_SPARC; }
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virtual const char *getName() const { return "solaris/sparc"; }
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virtual bool canPack();
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protected:
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virtual const upx_byte *getLoader() const;
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virtual int getLoaderSize() const;
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virtual void patchLoader();
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};
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#endif
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#endif /* already included */
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/*
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vi:ts=4:et
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*/
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