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{
Copyright (c) 2015 by Nikolay Nikolov
Contains the stuff for writing Relocatable Object Module Format (OMF)
libraries directly. This is the object format used on the i8086-msdos
platform (also known as .lib files in the dos world, even though Free
Pascal uses the extension .a).
This program is free software; you can redistribute it and/or modify
it 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; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit owomflib;
{$i fpcdefs.inc}
interface
uses
cclasses,
globtype,
owbase;
type
{ TOmfLibObjectWriter }
TOmfLibObjectWriter=class(TObjectWriter)
strict private
type
{ TOmfLibObjectModule }
TOmfLibObjectModule=class
strict private
FObjFileName: string;
FObjData: TDynamicArray;
FPageNum: Word;
public
constructor Create(const fn:string);
destructor Destroy; override;
property ObjData: TDynamicArray read FObjData;
property PageNum: Word read FPageNum write FPageNum;
end;
{ TOmfLibDictionaryEntry }
TOmfLibDictionaryEntry=class(TFPHashObject)
strict private
FModuleIndex: Integer;
public
constructor Create(HashObjectList:TFPHashObjectList;const aName:TSymStr;aModuleIndex:Integer);
property ModuleIndex: Integer read FModuleIndex write FModuleIndex;
end;
strict private
FPageSize: Integer;
FLibName: string;
FLibData: TDynamicArray;
FFooterPos: LongWord;
FDictionary: TFPHashObjectList;
FObjectModules: TFPObjectList;
FCurrentModule: TOmfLibObjectModule;
FCurrentModuleIndex: Integer;
procedure WriteHeader(DictStart: DWord; DictBlocks: Word);
procedure WriteFooter;
function TryPageSize(aPageSize: Integer): Boolean;
procedure DeterminePageSize;
procedure WriteLib;
function WriteDictionary: Word;
function TryWriteDictionaryWithSize(nblocks: Word): Boolean;
public
constructor createAr(const Aarfn:string);override;
constructor createAr(const Aarfn:string;PageSize:Integer);
destructor destroy;override;
function createfile(const fn:string):boolean;override;
procedure closefile;override;
procedure writesym(const sym:string);override;
procedure write(const b;len:longword);override;
end;
{ TOmfLibObjectReader }
TOmfLibObjectReader=class(TObjectReader)
strict private
type
{ TOmfLibDictionaryEntry }
TOmfLibDictionaryEntry=class(TFPHashObject)
strict private
FPageNum: Word;
public
constructor Create(HashObjectList:TFPHashObjectList;const aName:TSymStr;aPageNum:Word);
property PageNum: Word read FPageNum write FPageNum;
end;
strict private
LibSymbols : TFPHashObjectList;
islib: boolean;
CurrMemberPos : longint;
CurrMemberName : string;
FPageSize: Integer;
FIsCaseSensitive: Boolean;
procedure ReadLibrary;
procedure ReadDictionary(DictionaryOffset: DWord; DictionarySizeInBlocks: Word);
protected
function getfilename:string;override;
function GetPos: longint;override;
function GetIsArchive: boolean;override;
public
constructor createAr(const Aarfn:string;allow_nonar:boolean=false);override;
destructor destroy;override;
function openfile(const fn:string):boolean;override;
procedure closefile;override;
procedure seek(len:longint);override;
property IsCaseSensitive: Boolean read FIsCaseSensitive;
end;
implementation
uses
SysUtils,
cstreams,cutils,
verbose,
omfbase;
const
libbufsize = 65536;
objbufsize = 65536;
{*****************************************************************************
Helpers
*****************************************************************************}
function ModName2DictEntry(const modnm: string): string;
begin
if Copy(modnm,Length(modnm)-1,2)='.o' then
Result:=Copy(modnm,1,Length(modnm)-2)+'!'
else
Result:=modnm;
end;
{*****************************************************************************
TOmfLibObjectWriter.TOmfLibObjectModule
*****************************************************************************}
constructor TOmfLibObjectWriter.TOmfLibObjectModule.Create(const fn: string);
begin
FObjFileName:=fn;
FObjData:=TDynamicArray.Create(objbufsize);
end;
destructor TOmfLibObjectWriter.TOmfLibObjectModule.Destroy;
begin
FObjData.Free;
inherited Destroy;
end;
{*****************************************************************************
TOmfLibObjectWriter.TOmfLibDictionaryEntry
*****************************************************************************}
constructor TOmfLibObjectWriter.TOmfLibDictionaryEntry.Create(
HashObjectList: TFPHashObjectList; const aName: TSymStr; aModuleIndex:Integer);
begin
inherited Create(HashObjectList,aName);
ModuleIndex:=aModuleIndex;
end;
{*****************************************************************************
TOmfLibObjectWriter
*****************************************************************************}
constructor TOmfLibObjectWriter.createAr(const Aarfn: string);
begin
createAr(Aarfn,-1);
end;
constructor TOmfLibObjectWriter.createAr(const Aarfn: string;PageSize: Integer);
begin
FPageSize:=PageSize;
FLibName:=Aarfn;
FLibData:=TDynamicArray.Create(libbufsize);
FDictionary:=TFPHashObjectList.Create;
FObjectModules:=TFPObjectList.Create(True);
FCurrentModule:=nil;
end;
destructor TOmfLibObjectWriter.destroy;
begin
if Errorcount=0 then
WriteLib;
FLibData.Free;
FObjectModules.Free;
FDictionary.Free;
inherited destroy;
end;
function TOmfLibObjectWriter.createfile(const fn: string): boolean;
begin
FCurrentModule:=TOmfLibObjectModule.Create(fn);
FCurrentModuleIndex:=FObjectModules.Add(FCurrentModule);
createfile:=true;
fobjsize:=0;
end;
procedure TOmfLibObjectWriter.closefile;
var
RawRec: TOmfRawRecord;
ObjHeader: TOmfRecord_THEADR;
begin
FCurrentModule.ObjData.seek(0);
RawRec:=TOmfRawRecord.Create;
RawRec.ReadFrom(FCurrentModule.ObjData);
if RawRec.RecordType<>RT_THEADR then
begin
RawRec.Free;
InternalError(2018060801);
end;
ObjHeader:=TOmfRecord_THEADR.Create;
ObjHeader.DecodeFrom(RawRec);
{ create a dictionary entry with the module name }
TOmfLibDictionaryEntry.Create(FDictionary,ModName2DictEntry(ObjHeader.ModuleName),FCurrentModuleIndex);
ObjHeader.Free;
RawRec.Free;
fobjsize:=0;
end;
procedure TOmfLibObjectWriter.writesym(const sym: string);
begin
TOmfLibDictionaryEntry.Create(FDictionary,sym,FCurrentModuleIndex);
end;
procedure TOmfLibObjectWriter.write(const b; len: longword);
begin
inc(fobjsize,len);
inc(fsize,len);
FCurrentModule.ObjData.write(b,len);
end;
procedure TOmfLibObjectWriter.WriteHeader(DictStart: DWord; DictBlocks: Word);
var
Header: TOmfRecord_LIBHEAD;
RawRec: TOmfRawRecord;
begin
{ set header properties }
Header:=TOmfRecord_LIBHEAD.Create;
Header.PageSize:=FPageSize;
Header.DictionaryOffset:=DictStart;
Header.DictionarySizeInBlocks:=DictBlocks;
Header.CaseSensitive:=true;
{ write header }
RawRec:=TOmfRawRecord.Create;
Header.EncodeTo(RawRec);
FLibData.seek(0);
RawRec.WriteTo(FLibData);
Header.Free;
RawRec.Free;
end;
procedure TOmfLibObjectWriter.WriteFooter;
var
Footer: TOmfRecord_LIBEND;
RawRec: TOmfRawRecord;
begin
FLibData.seek(FFooterPos);
Footer:=TOmfRecord_LIBEND.Create;
Footer.CalculatePaddingBytes(FLibData.Pos);
RawRec:=TOmfRawRecord.Create;
Footer.EncodeTo(RawRec);
RawRec.WriteTo(FLibData);
Footer.Free;
RawRec.Free;
end;
function TOmfLibObjectWriter.TryPageSize(aPageSize: Integer): Boolean;
var
I: Integer;
CurrentPage: Integer;
CurrentPos: LongWord;
pow: longint;
begin
if not IsPowerOf2(aPageSize,pow) then
internalerror(2018060701);
if (pow<4) or (pow>15) then
internalerror(2018060702);
FPageSize:=aPageSize;
{ header is at page 0, so first module starts at page 1 }
CurrentPage:=1;
for I:=0 to FObjectModules.Count-1 do
with TOmfLibObjectModule(FObjectModules[I]) do
begin
if CurrentPage>high(word) then
exit(False);
PageNum:=CurrentPage;
{ calculate next page }
CurrentPos:=CurrentPage*FPageSize+ObjData.Size;
CurrentPage:=(CurrentPos+FPageSize-1) div FPageSize;
end;
FFooterPos:=CurrentPage*FPageSize;
Result:=True;
end;
procedure TOmfLibObjectWriter.DeterminePageSize;
var
I: Integer;
begin
if (FPageSize<>-1) and TryPageSize(FPageSize) then
{ success }
exit;
for I:=4 to 15 do
if TryPageSize(1 shl I) then
exit;
internalerror(2018060703);
end;
procedure TOmfLibObjectWriter.WriteLib;
var
libf: TCCustomFileStream;
DictStart, bytes: LongWord;
DictBlocks: Word;
I: Integer;
buf: array [0..1023] of Byte;
begin
DeterminePageSize;
libf:=CFileStreamClass.Create(FLibName,fmCreate);
if CStreamError<>0 then
begin
Message1(exec_e_cant_create_archivefile,FLibName);
exit;
end;
for I:=0 to FObjectModules.Count-1 do
with TOmfLibObjectModule(FObjectModules[I]) do
begin
FLibData.seek(PageNum*FPageSize);
ObjData.seek(0);
while ObjData.Pos<ObjData.size do
begin
bytes:=ObjData.read(buf,Min(SizeOf(buf),ObjData.size-ObjData.Pos));
FLibData.write(buf,bytes);
end;
end;
WriteFooter;
DictStart:=FLibData.Pos;
DictBlocks:=WriteDictionary;
WriteHeader(DictStart,DictBlocks);
FLibData.WriteStream(libf);
libf.Free;
end;
function TOmfLibObjectWriter.WriteDictionary: Word;
var
nb: Word;
begin
for nb in OmfLibDictionaryBlockCounts do
if TryWriteDictionaryWithSize(nb) then
exit(nb);
{ could not write dictionary, even with the largest number of blocks }
internalerror(2015042202);
end;
function TOmfLibObjectWriter.TryWriteDictionaryWithSize(nblocks: Word
): Boolean;
const
nbuckets=37;
freespace=nbuckets;
type
PBlock=^TBlock;
TBlock=array[0..511] of byte;
var
blocks: array of TBlock;
i: Integer;
N: TSymStr;
length_of_string: Integer;
h: TOmfLibHash;
start_block,start_bucket: Integer;
space_required: Integer;
pb: PBlock;
success: Boolean;
store_at: Integer;
PageNum: Word;
begin
blocks:=nil;
SetLength(blocks,nblocks);
for i:=0 to nblocks-1 do
begin
FillChar(blocks[i],SizeOf(blocks[i]),0);
blocks[i][freespace]:=(freespace+1) div 2;
end;
for i:=0 to FDictionary.Count-1 do
begin
N:=TOmfLibDictionaryEntry(FDictionary[i]).Name;
PageNum:=TOmfLibObjectModule(FObjectModules[TOmfLibDictionaryEntry(FDictionary[i]).ModuleIndex]).PageNum;
length_of_string:=Length(N);
h:=compute_omf_lib_hash(N,nblocks);
start_block:=h.block_x;
start_bucket:=h.bucket_x;
space_required:=1+length_of_string+2;
if odd(space_required) then
Inc(space_required);
repeat
pb:=@blocks[h.block_x];
success:=false;
{$push}
{ Disable range check in that part of code }
{$R-}
repeat
if pb^[h.bucket_x]=0 then
begin
if (512-pb^[freespace]*2)<space_required then
break;
pb^[h.bucket_x]:=pb^[freespace];
store_at:=2*pb^[h.bucket_x];
pb^[store_at]:=length_of_string;
Move(N[1],pb^[store_at+1],length_of_string);
pb^[store_at+1+length_of_string]:=Byte(PageNum);
pb^[store_at+1+length_of_string+1]:=Byte(PageNum shr 8);
Inc(pb^[freespace],space_required div 2);
if pb^[freespace]=0 then
pb^[freespace]:=255;
success:=true;
break;
end;
h.bucket_x:=(h.bucket_x+h.bucket_d) mod nbuckets;
until h.bucket_x=start_bucket;
{$pop}
if not success then
begin
h.block_x:=(h.block_x+h.block_d) mod nblocks;
if h.block_x=start_block then
exit(false); // not enough blocks
pb^[freespace]:=255;
end;
until success;
end;
FLibData.write(blocks[0],nblocks*SizeOf(TBlock));
Result:=true;
end;
{*****************************************************************************
TOmfLibObjectReader.TOmfLibDictionaryEntry
*****************************************************************************}
constructor TOmfLibObjectReader.TOmfLibDictionaryEntry.Create(
HashObjectList: TFPHashObjectList; const aName: TSymStr; aPageNum: Word);
begin
inherited Create(HashObjectList,aName);
PageNum:=aPageNum;
end;
{*****************************************************************************
TOmfLibObjectReader
*****************************************************************************}
procedure TOmfLibObjectReader.ReadLibrary;
var
RawRecord: TOmfRawRecord;
Header: TOmfRecord_LIBHEAD;
begin
RawRecord:=TOmfRawRecord.Create;
RawRecord.ReadFrom(Self);
Header:=TOmfRecord_LIBHEAD.Create;
Header.DecodeFrom(RawRecord);
FPageSize:=Header.PageSize;
FIsCaseSensitive:=Header.CaseSensitive;
ReadDictionary(Header.DictionaryOffset, Header.DictionarySizeInBlocks);
Header.Free;
RawRecord.Free;
end;
procedure TOmfLibObjectReader.ReadDictionary(DictionaryOffset: DWord; DictionarySizeInBlocks: Word);
const
nbuckets=37;
freespace=nbuckets;
type
PBlock=^TBlock;
TBlock=array[0..511] of byte;
var
blocks: array of TBlock;
blocknr: Integer;
block: PBlock;
ofs: Integer;
bucket: Integer;
length_of_string: Byte;
name: string;
PageNum: Integer;
begin
blocks:=nil;
name:='';
seek(DictionaryOffset);
SetLength(blocks,DictionarySizeInBlocks);
read(blocks[0],DictionarySizeInBlocks*SizeOf(TBlock));
for blocknr:=0 to DictionarySizeInBlocks-1 do
begin
block:=@(blocks[blocknr]);
for bucket:=0 to nbuckets-1 do
if block^[bucket]<>0 then
begin
ofs:=2*block^[bucket];
length_of_string:=block^[ofs];
if (ofs+1+length_of_string+1)>High(TBlock) then
begin
Comment(V_Error,'OMF dictionary entry goes beyond end of block');
continue;
end;
SetLength(name,length_of_string);
Move(block^[ofs+1],name[1],length_of_string);
PageNum:=block^[ofs+1+length_of_string]+
block^[ofs+1+length_of_string+1] shl 8;
TOmfLibDictionaryEntry.create(LibSymbols,name,PageNum);
end;
end;
end;
function TOmfLibObjectReader.getfilename: string;
begin
Result:=inherited getfilename;
if CurrMemberName<>'' then
result:=result+'('+CurrMemberName+')';
end;
function TOmfLibObjectReader.GetPos: longint;
begin
result:=inherited GetPos-CurrMemberPos;
end;
function TOmfLibObjectReader.GetIsArchive: boolean;
begin
result:=islib;
end;
constructor TOmfLibObjectReader.createAr(const Aarfn: string; allow_nonar: boolean);
var
RecType: Byte;
begin
inherited Create;
LibSymbols:=TFPHashObjectList.Create(true);
CurrMemberPos:=0;
CurrMemberName:='';
if inherited openfile(Aarfn) then
begin
Read(RecType,1);
Seek(0);
islib:=RecType=RT_LIBHEAD;
if islib then
ReadLibrary
else if (not allow_nonar) then
Comment(V_Error,'Not an OMF library file, illegal magic: '+filename);
end;
end;
destructor TOmfLibObjectReader.destroy;
begin
inherited closefile;
LibSymbols.Free;
inherited Destroy;
end;
function TOmfLibObjectReader.openfile(const fn: string): boolean;
var
libsym: TOmfLibDictionaryEntry;
RawRec: TOmfRawRecord;
Header: TOmfRecord_THEADR;
begin
result:=false;
libsym:=TOmfLibDictionaryEntry(LibSymbols.Find(ModName2DictEntry(fn)));
if not assigned(libsym) then
exit;
CurrMemberPos:=libsym.PageNum*FPageSize;
inherited Seek(CurrMemberPos);
{ read the header, to obtain the module name }
RawRec:=TOmfRawRecord.Create;
RawRec.ReadFrom(self);
Header:=TOmfRecord_THEADR.Create;
Header.DecodeFrom(RawRec);
CurrMemberName:=Header.ModuleName;
Header.Free;
RawRec.Free;
{ go back to the beginning of the file }
inherited Seek(CurrMemberPos);
result:=true;
end;
procedure TOmfLibObjectReader.closefile;
begin
CurrMemberPos:=0;
CurrMemberName:='';
end;
procedure TOmfLibObjectReader.seek(len: longint);
begin
inherited Seek(CurrMemberPos+len);
end;
end.
|