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335 lines
6.2 KiB
ObjectPascal
335 lines
6.2 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 by Peter Vreman
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Contains the base stuff for writing for object files to disk
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit owbase;
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{$i fpcdefs.inc}
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interface
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uses
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cstreams,
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cclasses;
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type
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tobjectwriter=class
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private
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f : TCFileStream;
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opened : boolean;
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buf : pchar;
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bufidx : longint;
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size : longint;
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procedure writebuf;
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public
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constructor create;
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destructor destroy;override;
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function createfile(const fn:string):boolean;virtual;
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procedure closefile;virtual;
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procedure writesym(const sym:string);virtual;
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procedure write(const b;len:longint);virtual;
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procedure WriteZeros(l:longint);
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end;
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tobjectreader=class
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private
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f : TCFileStream;
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opened : boolean;
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buf : pchar;
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bufidx,
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bufmax : longint;
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function readbuf:boolean;
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public
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constructor create;
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destructor destroy;override;
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function openfile(const fn:string):boolean;virtual;
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procedure closefile;virtual;
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procedure seek(len:longint);
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function read(var b;len:longint):boolean;virtual;
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function readarray(a:TDynamicArray;len:longint):boolean;
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end;
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implementation
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uses
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cutils,
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verbose;
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const
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bufsize = 32768;
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{****************************************************************************
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TObjectWriter
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****************************************************************************}
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constructor tobjectwriter.create;
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begin
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getmem(buf,bufsize);
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bufidx:=0;
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opened:=false;
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size:=0;
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end;
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destructor tobjectwriter.destroy;
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begin
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if opened then
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closefile;
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freemem(buf,bufsize);
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end;
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function tobjectwriter.createfile(const fn:string):boolean;
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begin
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createfile:=false;
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f:=TCFileStream.Create(fn,fmCreate);
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if CStreamError<>0 then
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begin
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Message1(exec_e_cant_create_objectfile,fn);
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exit;
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end;
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bufidx:=0;
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size:=0;
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opened:=true;
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createfile:=true;
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end;
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procedure tobjectwriter.closefile;
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var
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fn : string;
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begin
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if bufidx>0 then
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writebuf;
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fn:=f.filename;
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f.free;
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{ Remove if size is 0 }
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if size=0 then
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DeleteFile(fn);
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opened:=false;
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size:=0;
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end;
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procedure tobjectwriter.writebuf;
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begin
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f.write(buf^,bufidx);
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bufidx:=0;
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end;
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procedure tobjectwriter.writesym(const sym:string);
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begin
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end;
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procedure tobjectwriter.write(const b;len:longint);
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var
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p : pchar;
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left,
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idx : longint;
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begin
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inc(size,len);
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p:=pchar(@b);
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idx:=0;
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while len>0 do
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begin
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left:=bufsize-bufidx;
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if len>left then
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begin
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move(p[idx],buf[bufidx],left);
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dec(len,left);
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inc(idx,left);
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inc(bufidx,left);
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writebuf;
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end
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else
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begin
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move(p[idx],buf[bufidx],len);
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inc(bufidx,len);
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exit;
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end;
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end;
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end;
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procedure tobjectwriter.WriteZeros(l:longint);
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var
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empty : array[0..255] of byte;
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begin
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if l>sizeof(empty) then
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internalerror(200404081);
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if l>0 then
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begin
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fillchar(empty,l,0);
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Write(empty,l);
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end;
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end;
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{****************************************************************************
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TObjectReader
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****************************************************************************}
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constructor tobjectreader.create;
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begin
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getmem(buf,bufsize);
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bufidx:=0;
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bufmax:=0;
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opened:=false;
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end;
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destructor tobjectreader.destroy;
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begin
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if opened then
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closefile;
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freemem(buf,bufsize);
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end;
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function tobjectreader.openfile(const fn:string):boolean;
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begin
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openfile:=false;
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f:=TCFileStream.Create(fn,fmOpenRead);
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if CStreamError<>0 then
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begin
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Message1(exec_e_cant_create_objectfile,fn);
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exit;
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end;
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bufidx:=0;
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bufmax:=0;
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opened:=true;
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openfile:=true;
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end;
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procedure tobjectreader.closefile;
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begin
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f.free;
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opened:=false;
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bufidx:=0;
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bufmax:=0;
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end;
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function tobjectreader.readbuf:boolean;
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begin
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bufmax:=f.read(buf^,bufsize);
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bufidx:=0;
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readbuf:=(bufmax>0);
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end;
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procedure tobjectreader.seek(len:longint);
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begin
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f.seek(len,soFromBeginning);
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bufidx:=0;
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bufmax:=0;
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end;
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function tobjectreader.read(var b;len:longint):boolean;
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var
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p : pchar;
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left,
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idx : longint;
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begin
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read:=false;
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if bufmax=0 then
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if not readbuf then
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exit;
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p:=pchar(@b);
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idx:=0;
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while len>0 do
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begin
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left:=bufmax-bufidx;
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if len>left then
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begin
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move(buf[bufidx],p[idx],left);
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dec(len,left);
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inc(idx,left);
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inc(bufidx,left);
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if not readbuf then
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exit;
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end
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else
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begin
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move(buf[bufidx],p[idx],len);
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inc(bufidx,len);
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inc(idx,len);
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break;
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end;
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end;
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read:=(idx=len);
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end;
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function tobjectreader.readarray(a:TDynamicArray;len:longint):boolean;
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var
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orglen,
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left,
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idx : longint;
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begin
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readarray:=false;
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if bufmax=0 then
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if not readbuf then
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exit;
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orglen:=len;
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idx:=0;
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while len>0 do
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begin
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left:=bufmax-bufidx;
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if len>left then
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begin
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a.Write(buf[bufidx],left);
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dec(len,left);
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inc(idx,left);
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inc(bufidx,left);
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if not readbuf then
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exit;
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end
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else
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begin
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a.Write(buf[bufidx],len);
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inc(bufidx,len);
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inc(idx,len);
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break;
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end;
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end;
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readarray:=(idx=orglen);
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end;
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end.
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{
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$Log$
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Revision 1.13 2004-06-20 08:55:30 florian
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* logs truncated
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Revision 1.12 2004/06/16 20:07:09 florian
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* dwarf branch merged
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Revision 1.11.2.1 2004/04/08 18:33:22 peter
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* rewrite of TAsmSection
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}
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