upx/src/packmast.cpp

/* packmast.cpp --

   This file is part of the UPX executable compressor.

   Copyright (C) 1996-2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996-2000 Laszlo Molnar

   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
 */


#include "conf.h"
#include "file.h"
#include "packmast.h"
#include "packer.h"
#include "lefile.h"
#include "p_com.h"
#include "p_djgpp2.h"
#include "p_exe.h"
#include "p_elf.h"
#include "p_unix.h"
#include "p_lx_elf.h"
#include "p_lx_sep.h"
#include "p_lx_sh.h"
#include "p_sys.h"
#include "p_tos.h"
#include "p_wcle.h"
#include "p_tmt.h"
#include "p_vxd.h"
#include "p_w32pe.h"


/*************************************************************************
//
**************************************************************************/

PackMaster::PackMaster(InputFile *f, struct options_t *o) :
    fi(f), p(NULL)
{
    // replace options with local options
    saved_opt = o;
    if (o)
    {
        this->local_options = *o;       // struct copy
        opt = &this->local_options;
    }
}


PackMaster::~PackMaster()
{
    fi = NULL;
    delete p; p = NULL;
    // restore options
    if (saved_opt)
        opt = saved_opt;
    saved_opt = NULL;
}


/*************************************************************************
//
**************************************************************************/

typedef Packer* (*try_function)(Packer *p, InputFile *f);

static Packer* try_pack(Packer *p, InputFile *f)
{
    if (p == NULL)
        return NULL;
#if !defined(UNUPX)
    try {
        p->initPackHeader();
        f->seek(0,SEEK_SET);
        if (p->canPack())
        {
            p->updatePackHeader();
            f->seek(0,SEEK_SET);
            return p;
        }
    } catch (IOException&) {
    } catch (...) {
        delete p;
        throw;
    }
#endif /* UNUPX */
    delete p;
    return NULL;
}


static Packer* try_unpack(Packer *p, InputFile *f)
{
    if (p == NULL)
        return NULL;
    try {
        p->initPackHeader();
        f->seek(0,SEEK_SET);
        int r = p->canUnpack();
        if (r > 0)
        {
            f->seek(0,SEEK_SET);
            return p;
        }
        if (r < 0)
        {
            // FIXME - could stop testing all other unpackers at this time
            // see canUnpack() in packer.h
        }
    } catch (IOException&) {
    } catch (...) {
        delete p;
        throw;
    }
    delete p;
    return NULL;
}


/*************************************************************************
//
**************************************************************************/

static Packer* try_packers(InputFile *f, try_function func)
{
    Packer *p = NULL;

    // note: order of tries is important !
    if (!opt->dos.force_stub)
    {
        if ((p = func(new PackDjgpp2(f),f)) != NULL)
            return p;
        if ((p = func(new PackTmt(f),f)) != NULL)
            return p;
        if ((p = func(new PackWcle(f),f)) != NULL)
            return p;
#if 0
        if ((p = func(new PackVxd(f),f)) != NULL)
            return p;
#endif
        if ((p = func(new PackW32Pe(f),f)) != NULL)
            return p;
    }
    if ((p = func(new PackExe(f),f)) != NULL)
        return p;
    if ((p = func(new PackTos(f),f)) != NULL)
        return p;
#if 0
    if (opt->unix.script_name)
    {
        if ((p = func(new PackLinuxI386sep(f),f)) != NULL)
            return p;
    }
#endif
    if ((p = func(new PackLinuxI386elf(f),f)) != NULL)
        return p;
    if ((p = func(new PackLinuxI386sh(f),f)) != NULL)
        return p;
#if 0
    if ((p = func(new PackBvmlinuxI386(f),f)) != NULL)
        return p;
#endif
    if ((p = func(new PackLinuxI386(f),f)) != NULL)
        return p;
    if ((p = func(new PackSys(f),f)) != NULL)
        return p;
    if ((p = func(new PackCom(f),f)) != NULL)
        return p;
    return NULL;
}


static Packer *getPacker(InputFile *f)
{
    Packer *p = try_packers(f, try_pack);
    if (!p)
        throwUnknownExecutableFormat();
    return p;
}


static Packer *getUnpacker(InputFile *f)
{
    Packer *p = try_packers(f, try_unpack);
    if (!p)
        throwNotPacked();
    return p;
}


static void assertPacker(const Packer *p)
{
    assert(strlen(p->getName()) <= 13);
}


/*************************************************************************
// delegation
**************************************************************************/

void PackMaster::pack(OutputFile *fo)
{
    p = getPacker(fi);
    assertPacker(p);
    fi = NULL;
    p->doPack(fo);
}


void PackMaster::unpack(OutputFile *fo)
{
    p = getUnpacker(fi);
    assertPacker(p);
    fi = NULL;
    p->doUnpack(fo);
}


void PackMaster::test()
{
    p = getUnpacker(fi);
    assertPacker(p);
    fi = NULL;
    p->doTest();
}


void PackMaster::list()
{
    p = getUnpacker(fi);
    assertPacker(p);
    fi = NULL;
    p->doList();
}


void PackMaster::fileInfo()
{
    p = try_packers(fi, try_unpack);
    if (!p)
        p = try_packers(fi, try_pack);
    if (!p)
        throwUnknownExecutableFormat(NULL, 1);    // make a warning here
    assertPacker(p);
    fi = NULL;
    p->doFileInfo();
}


/*
vi:ts=4:et:nowrap
*/