Class: Resedit::LEHeader

Inherits:
ExeHeader show all
Defined in:
lib/resedit/mz/le.rb

Constant Summary collapse

MAGIC = 
[0x454C, 0x584C, 0x434C]
HSIZE = 
0xAC
HDRDESCR = 
[:Magic, :BOrd, :WOrd, :FormatLevel, :CpuType, :OsType, :ModuleVersion, :ModuleFlags, :ModulePages, :EIPObj, :EIP, :ESPObj, :ESP,
:PageSize, :PageShift, :FixupSize, :FixupCsum, :LoaderSize, :LoaderCsum, :ObjectTableOfs, :ObjectsInModule,
:ObjectPageOfs, :ObjectIterOfs, :ResourceTableOfs, :ResourceTableEntries, :ResidentTableOfs, :EntryTableOfs,
:ModuleDirectivesOfs, :ModuleDirectives, :FixupPageOfs, :FixupRecordOfs, :ImportTblOfs, :ImportEntries, :ImportProcOfs,
:PerPageCsumOfs, :DataPagesOfs, :PreloadPages, :NonResTableOfs, :NonResTableLen, :NonResTableCsum, :AutoDSObject,
:DebugInfoOfs, :DebugInfoLen, :InstancePreload, :InstanceDemand, :Heapsize]
HDRUNPACK = 
"vCCVvvV*"
HDR_OFFSETS = 
[:ObjectTableOfs, :ObjectPageOfs, :ObjectIterOfs, :ResourceTableOfs,:ResidentTableOfs, :EntryTableOfs, :ModuleDirectivesOfs,
:FixupPageOfs, :FixupRecordOfs, :ImportTblOfs, :ImportProcOfs, :PerPageCsumOfs, :DataPagesOfs, :NonResTableOfs, :DebugInfoOfs]

Constants inherited from ExeHeader

ExeHeader::BLK, ExeHeader::PARA

Constants inherited from Changeable

Changeable::COL_CHANGED, Changeable::COL_ORIGINAL, Changeable::HOW_CHANGED, Changeable::HOW_ORIGINAL, Changeable::LOG

Instance Attribute Summary collapse

Attributes inherited from ExeHeader

#exe, #info

Instance Method Summary collapse

Methods inherited from ExeHeader

#_headerTable, #change, #fieldOffset, #fieldSize, #loadInfo, #setBodySize, #setFileSize, #setHeaderSize, #setInfo

Methods inherited from Changeable

#addData, #bytes, #change, #changed?, #colStr, #colVal, #curcol, #dbgdump, #debug, #fix, #getChanges, #getData, #hex, #hexify, #insert, #loadChanges, #parseHow, #revert, #saveChanges, #saveData, #setData, #size, #undo, #unhexify

Constructor Details

#initialize(exe, file, fsize) ⇒ LEHeader

Returns a new instance of LEHeader.



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# File 'lib/resedit/mz/le.rb', line 20

def initialize(exe, file, fsize)
    @_tablesOrig = nil
    @sofs = file.tell()
    super(exe, file, fsize)
end

Instance Attribute Details

#tables ⇒ Object (readonly)

Returns the value of attribute tables.



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# File 'lib/resedit/mz/le.rb', line 18

def tables
  @tables
end

Instance Method Details

#addPageReloc(pageId, ofs, obj, val) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 93

def addPageReloc(pageId, ofs, obj, val)
    return true if pageRelocs(pageId, ofs, obj, val)
    #extend page fixups
    buf = [7, 0x10, ofs, obj, val].pack("CCs<CV")
    #change fixups offsets
    pgs = getData(@info[:FixupPageOfs]+4*(pageId+1), (@info[:ModulePages]-pageId)*4).unpack("V*")
    d = buf.length
    insert(@info[:FixupRecordOfs]+pgs[0], buf)
    pgs = pgs.map{|v| v+d} #fixup sizes change
    change(@info[:FixupPageOfs]+4*(pageId+1), pgs.pack("V*"))
    #fix header
    fixOffsets(@info[:FixupRecordOfs], d)
    @info[:FixupSize]+=d
    setInfo(:FixupSize, @info[:FixupSize])
    @info[:LoaderSize]+=d
    setInfo(:LoaderSize, @info[:LoaderSize])
    @_tables = nil
    mode(HOW_CHANGED)
    rels = pageRelocs(pageId)
end

#addReloc(ofs, trg = nil) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 180

def addReloc(ofs, trg=nil)
    mode(HOW_CHANGED)
    trg = trg ? @exe.body.raw2addr(trg) : getData(ofs, 4)
    obj = val = -1
    @tables[:Objects].each_with_index{|o,i|
        obj,val = [i+1,trg-o[1]] if o[1]<=trg && o[0]+o[1]>trg
    }
    raise "Target not found for offset: #{trg.to_i(trg)}" if obj==-1
    psz = @info[:PageSize]
    pgid = ofs / psz
    #puts "Adding reloc #{ofs.to_s(16)} -> #{trg.to_s(16)} #{obj}:#{val.to_s(16)} #{pgid}"
    ofs = ofs % psz
    addPageReloc(pgid, ofs, obj, val)
    addPageReloc(pgid+1, ofs-psz, obj, val) if ofs+4>psz
    @_tables = nil
    mode(HOW_CHANGED)
    @exe.body.clearRelocs()
    return true
end

#addSegment(size) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 134

def addSegment(size)
    mode(HOW_CHANGED)
    psz = @info[:PageSize]
    tail = size % psz
    pgs = size / psz + (tail==0 ? 0 : 1)
    tail = psz if tail==0

    #add new object
    last = @tables[:Objects][-1]
    virt = last[1]+last[0]  #lastobject virt base+size
    virt = (virt+psz-1) & ~(psz-1) #align vbase to page size
    obj = [psz*pgs, virt, 0x2047, last[3]+last[4], pgs, 0].pack("V*")  # 32b rwx preloaded object
    insert(@info[:ObjectTableOfs] + 0x18*@info[:ObjectsInModule], obj)
    fixOffsets(@info[:ObjectTableOfs], 0x18)
    setInfo(:ObjectsInModule, @info[:ObjectsInModule]+1)

    #add pages info
    pinfo = ''
    pgs.times{|i|
        pid = @info[:ModulePages]+i+1
        pinfo+=[(pid*@info[:PageSize])<<4].pack("V")
    }
    insert(@info[:ObjectPageOfs]+@info[:ModulePages]*4, pinfo)
    fixOffsets(@info[:ObjectPageOfs], pinfo.length)

    #add empty fixups
    fixofs = 4*@info[:ModulePages]
    fixval = getData(@info[:FixupPageOfs]+fixofs, 4).unpack("V")[0]
    pinfo = [fixval].pack("V") * pgs #end of fixup table <added pages> times
    insert(@info[:FixupPageOfs]+fixofs+4, pinfo)
    fixOffsets(@info[:FixupPageOfs], pinfo.length)
    setInfo(:FixupSize, @info[:FixupSize]+pinfo.length)

    #change pages and tail, fix loader size
    setInfo(:ModulePages, @info[:ModulePages]+pgs)
    setInfo(:PageShift, tail)
    setInfo(:LoaderSize, @info[:ImportTblOfs]-@info[:ObjectTableOfs]+1)

    @_tables = nil
    #reload tables
    mode(HOW_CHANGED)

    return (@info[:ModulePages]-pgs)*@info[:PageSize]
end

#entry ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 67

def entry; sprintf("0x%08X", @info[:EIP]) end

#fileSize ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 66

def fileSize(); headerSize()+(@info[:ModulePages]-1)*@info[:PageSize]+@info[:PageShift] end

#fixOffsets(after, val) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 125

def fixOffsets(after, val)
    HDR_OFFSETS.each{|ofs|
        next if @info[ofs]==0 or @info[ofs]<=after
        @info[ofs]+=val
        setInfo(ofs, @info[ofs])
    }
end

#headerSize ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 65

def headerSize(); @info[:DataPagesOfs]-@exe.mzSize end

#loadTables(file) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 26

def loadTables(file)
    if @_tablesOrig==nil
        objtblend = @sofs+@info[:ObjectTableOfs]+@info[:ObjectsInModule]*0x18
        #addData(file, objtblend-file.tell())
        objtblend = @sofs+@info[:ObjectPageOfs]+@info[:ModulePages]*8
        addData(file, objtblend-file.tell())
    end
    tbl = {:Objects => [], :Pages => []}
    ofs = 0
    for i in 0..@info[:ObjectsInModule]-1
        descr = getData(@info[:ObjectTableOfs]+i*0x18, 0x18).unpack("V*")
        tbl[:Objects] += [descr]
        @exe.env.set("seg#{i}".to_sym, ofs.to_s)
        ofs += descr[4]*@info[:PageSize]
    end
    for i in 0..@info[:ModulePages]-1
        tbl[:Pages] += getData(@info[:ObjectPageOfs]+i*4, 4).unpack("V")
    end
    if @_tablesOrig==nil
        @tables = @_tablesOrig = tbl
    end
    return tbl
end

#loadTail(file) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 50

def loadTail(file);
    addData(file, headerSize() + @sofs - file.tell())
end

#mode(how) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 54

def mode(how)
    super(how)
    if @mode == HOW_ORIGINAL
        @tables = @_tablesOrig
    else
        @_tables = loadTables(nil) if !@_tables
        @tables = @_tables
    end
end

#pageRelocs(pageId, fixOfs = nil, fixObj = nil, fixVal = nil) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 69

def pageRelocs(pageId, fixOfs=nil, fixObj=nil, fixVal=nil)
    def read(pos,cnt, unp); [getData(@info[:FixupRecordOfs]+pos, cnt).unpack(unp), pos+cnt] end
    pgs = getData(@info[:FixupPageOfs]+4*pageId, 8).unpack("V*")
    pgofs = pageId * @info[:PageSize]
    ret = {}
    pos = pgs[0]
    while pos<pgs[1]
        v,pos = read(pos, 5, "CCs<C")
        raise "Unknown fixup type #{v[0]} #{v[1]}" if (v[0]!=7 && v[0]!=2) || (v[1] & ~0x10 !=0 )
        trg, pos=read(pos, v[1]==0x10 ? 4 : 2,v[1]==0x10 ? "V" : "v")
        next if fixOfs!=nil && (v[2]!=fixOfs || (v[1]==0 && fixVal>0xFF))
        if fixOfs
            buf = [fixObj, fixVal].pack("C" + v[1]==0x10 ? "V" : "v")
            change(@info[:FixupRecordOfs]+pos-1, buf)       #change fixup object & value
            return true
        end
        next if v[2]<0
        ret[pgofs+v[2]] = @tables[:Objects][v[3]-1][1]+trg[0]
    end
    return false if fixOfs
    return ret
end

#print(what, how = nil) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 201

def print(what, how=nil)
    ret = super(what, how)
    if what=="tables"
        puts "Objects: #{@tables[:Objects].map{|o| o.map{|v| v.to_s(16)}}}"
        puts "Pages: #{@tables[:Pages].map{|x| x.to_s(16)}}"
        return true
    end
    return ret
end

#read(pos, cnt, unp) ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 70

def read(pos,cnt, unp); [getData(@info[:FixupRecordOfs]+pos, cnt).unpack(unp), pos+cnt] end

#readRelocs ⇒ Object 



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# File 'lib/resedit/mz/le.rb', line 115

def readRelocs()
    ret = {}
    for i in 0..@info[:ModulePages]-1
        pgofs = i * @info[:PageSize]
        ret[pgofs] = pageRelocs(i)
    end
    return ret
end