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PV_Tar.pas
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unit PV_Tar;
{$mode objfpc}{$H+}
//PV Pack
//https://github.com/PascalVault
//Licence: MIT
//Last update: 2023-10-04
//TAR
interface
uses
Classes, SysUtils, StrUtils, Math, Dialogs, CRC32_ISOHDLC, PV_Pack;
type
{ TTar }
TTar = class(TPack)
private
FStream: TStream;
FList: TFileList;
FComment: String;
public
constructor Create(Str: TStream); override;
destructor Destroy; override;
function AddFile(Str: TStream; Name: String): Boolean; override;
procedure SetComment(Comment: String); override;
end;
implementation
{ TTar }
function IntToOct(Val: Integer): String;
var Rest: Integer;
begin
Result := '';
while Val <> 0 do begin
Rest := Val mod 8;
Val := Val div 8;
Result := IntToStr(Rest) + Result;
end;
end;
constructor TTar.Create(Str: TStream);
begin
FStream := Str;
FList := TFileList.Create;
end;
destructor TTar.Destroy;
begin
//
end;
function TTar.AddFile(Str: TStream; Name: String): Boolean;
const BufLen = 4096;
type THead = packed record
FName : array[0..99] of Char;
FileMode : array[0..7] of Char;
OwnerID : array[0..7] of Char;
GroupID : array[0..7] of Char;
UnpackedSize: array[0..11] of Char;
ModTime : array[0..11] of Char;
Checksum : array[0..7] of Char;
FileType : Char;
LinkName : array[0..99] of Char;
UstarMagic : array[0..5] of Char;
Version : array[0..1] of Char;
UName : array[0..31] of Char;
GName : array[0..31] of Char;
DevMajor : array[0..7] of Char;
DevMinor : array[0..7] of Char;
Prefix : array[0..154] of Char;
end;
var Head: THead;
HeadStr: String;
HeadLen: Integer;
HeadOffset: Integer;
DataOffset: Integer;
PackSize: Cardinal;
Hasher: TCRC32_ISO;
Buf: array of Byte;
ReadLen: Integer;
FinalOffset: Cardinal;
CkSum: Cardinal;
i: Integer;
Null: Byte;
Pad: Integer;
begin
with Head do begin
FName := Name;
FileMode := '0000777' + chr(0);
OwnerID := '0000000' + chr(0);
GroupID := '0000000' + chr(0);
UnpackedSize := AddChar('0', IntToOct(Str.Size), 11) + chr(0);
ModTime := AddChar('0', IntToOct(UnixStamp), 11) + chr(0);
Checksum := ' ';
FileType := '0';
LinkName := AddChar(chr(0), '', 100);
UstarMagic := 'ustar ';
Version := ' ' + chr(0);
UName := AddChar(chr(0), '', 32);
GName := AddChar(chr(0), '', 32);
DevMajor := AddChar(chr(0), '', 8);
DevMinor := AddChar(chr(0), '', 8);
Prefix := AddChar(chr(0), '', 155);
end;
HeadStr := Head.FName + Head.FileMode + Head.OwnerID + Head.GroupID + Head.UnpackedSize + Head.ModTime + Head.Checksum +
Head.FileType + Head.LinkName + Head.UstarMagic + Head.Version + Head.UName + Head.Gname + Head.DevMajor +
Head.DevMinor + Head.Prefix;
CkSum := 0;
for i:=1 to Length(HeadStr) do
CkSum := CkSum + ord(HeadStr[i]);
Head.Checksum := AddChar('0', IntToOct(CkSum), 6) + chr(0) + ' ';
FStream.Write(Head, SizeOf(Head));
Pad := Ceil(FStream.Position / 512) * 512 - FStream.Position;
Null := 0;
for i:=0 to Pad-1 do
FStream.Write(Null, 1);
SetLength(Buf, BufLen);
while Str.Position < Str.Size do begin
ReadLen := Str.Read(Buf[0], BufLen);
FStream.Write(Buf[0], ReadLen);
end;
Pad := Ceil(FStream.Position / 512) * 512 - FStream.Position;
Null := 0;
for i:=0 to Pad-1 do
FStream.Write(Null, 1);
for i:=0 to 511 do
FStream.Write(Null, 1);
for i:=0 to 511 do
FStream.Write(Null, 1);
end;
procedure TTar.SetComment(Comment: String);
begin
FComment := Comment;
end;
end.