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unit fileunit;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Process;
type
tInputThread = class (tThread)
fertig: boolean;
inhalt: pointer;
len: longint;
proc: tProcess;
constructor create(p: tProcess; inh: pointer; l: longint);
destructor destroy; override;
procedure execute; override;
end;
procedure saveToFile(name: string; pt: pointer; len: longint); inline;
procedure saveToGz(name: string; pt: pointer; len: longint); inline;
procedure loadFromFile(name: string; out pt: pointer; out len: longint); inline;
procedure loadFromGz(name: string; out pt: pointer; out len: longint); inline;
implementation
uses systemunit, math;
const
minBufLen = 1024*1024;
procedure saveToFile(name: string; pt: pointer; len: longint);
var
f: file;
n: string;
begin
if fileexists(name) then
n:=mkTemp(name+'.XXXXXX')
else
n:=name;
assignfile(f,n);
rewrite(f,1);
blockwrite(f,pt^,len);
closefile(f);
if name<>n then begin
deleteFile(name);
rename(f,name);
end;
end;
procedure saveToGz(name: string; pt: pointer; len: longint);
var
pr: tProcess;
buf: array of byte;
f: file;
rb: longint;
it: tInputThread;
datNam: string;
begin
if fileexists(name) then
datNam:=mkTemp(name+'.XXXXXX')
else
datNam:=name;
pr:=tProcess.create(nil);
pr.executable:='gzip';
pr.parameters.add('--best');
pr.parameters.add('-c');
pr.options:=pr.options + [poUsePipes];
pr.execute;
setlength(buf,minBufLen);
fillchar(buf[0],length(buf)*sizeof(buf[0]),$0);
it:=tInputThread.create(pr,pt,len);
assignfile(f,datNam);
rewrite(f,1);
while pr.running or (not it.fertig) or (pr.output.numBytesAvailable>0) do begin
rb:=min(length(buf),pr.output.numBytesAvailable);
if rb>0 then begin
rb:=pr.output.read(buf[0],rb);
blockwrite(f,buf[0],rb);
end
else
sleep(1); // nix zu Schreiben, nix zu Lesen, also warten wir
end;
pr.free;
it.free;
closefile(f);
if name<>datNam then begin
deleteFile(name);
rename(f,name);
end;
end;
procedure loadFromFile(name: string; out pt: pointer; out len: longint);
var
f: file;
begin
assign(f,name);
reset(f,1);
len:=filesize(f);
getmem(pt,len);
blockread(f,pt^,len);
close(f);
end;
procedure loadFromGz(name: string; out pt: pointer; out len: longint);
var
pr: tProcess;
pTmp: pByte;
pLen,rb,br: longint;
begin
pr:=tProcess.create(nil);
pr.executable:='zcat';
pr.parameters.add(name);
pr.options:=pr.options + [poUsePipes];
pLen:=minBufLen;
getmem(pTmp,pLen);
br:=0;
pr.execute;
while pr.running or (pr.output.numBytesAvailable>0) do begin
rb:=pr.output.numBytesAvailable;
if rb>0 then begin
if pLen<br+rb then begin
pt:=pTmp;
len:=pLen;
pLen:=br+rb+minBufLen;
getmem(pTmp,pLen);
move(pt^,pTmp^,len);
freemem(pt);
end;
rb:=pr.output.read((pTmp+br)^,rb);
br:=br+rb;
end
else sleep(1);
end;
len:=br;
getmem(pt,len);
move(pTmp^,pt^,len);
freemem(pTmp);
end;
// tInputThread ****************************************************************
constructor tInputThread.create(p: tProcess; inh: pointer; l: longint);
begin
inherited create(true);
fertig:=false;
inhalt:=inh;
len:=l;
proc:=p;
suspended:=false;
end;
destructor tInputThread.destroy;
begin
inhalt:=nil;
proc:=nil;
inherited destroy;
end;
procedure tInputThread.execute;
var
wb,cwb: longint;
begin
wb:=0;
while wb<len do begin
cwb:=proc.input.write((inhalt+wb)^,len-wb);
if cwb=0 then
sleep(1)
else
wb:=wb+cwb;
end;
proc.CloseInput;
fertig:=true;
end;
end.
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