102 lines
2.3 KiB
ObjectPascal
102 lines
2.3 KiB
ObjectPascal
Unit AViewRAR;
|
|
|
|
{$I M_OPS.PAS}
|
|
|
|
(* DOES NOT WORK IF FILE HAS COMMENTS... NEED TO READ SKIP ADDSIZE IF NOT $74
|
|
|
|
1. Read and check marker block
|
|
2. Read archive header
|
|
3. Read or skip HEAD_SIZE-sizeof(MAIN_HEAD) bytes
|
|
4. If end of archive encountered then terminate archive processing,
|
|
else read 7 bytes into fields HEAD_CRC, HEAD_TYPE, HEAD_FLAGS,
|
|
HEAD_SIZE.
|
|
5. Check HEAD_TYPE.
|
|
if HEAD_TYPE==0x74
|
|
read file header ( first 7 bytes already read )
|
|
read or skip HEAD_SIZE-sizeof(FILE_HEAD) bytes
|
|
if (HEAD_FLAGS & 0x100)
|
|
read or skip HIGH_PACK_SIZE*0x100000000+PACK_SIZE bytes
|
|
else
|
|
read or skip PACK_SIZE bytes
|
|
else
|
|
read corresponding HEAD_TYPE block:
|
|
read HEAD_SIZE-7 bytes
|
|
if (HEAD_FLAGS & 0x8000)
|
|
read ADD_SIZE bytes
|
|
6. go to 4.
|
|
*)
|
|
|
|
Interface
|
|
|
|
Uses
|
|
DOS,
|
|
AView;
|
|
|
|
Type
|
|
RarHeaderRec = Record
|
|
PackSize : LongInt;
|
|
Size : LongInt;
|
|
HostOS : Byte;
|
|
FileCRC : LongInt;
|
|
Time : LongInt;
|
|
Version : Byte;
|
|
Method : Byte;
|
|
FNSize : SmallInt;
|
|
Attr : Longint;
|
|
End;
|
|
|
|
PRarArchive = ^TRarArchive;
|
|
TRarArchive = Object(TGeneralArchive)
|
|
Constructor Init;
|
|
Procedure FindFirst (Var SR : ArcSearchRec); Virtual;
|
|
Procedure FindNext (Var SR : ArcSearchRec); Virtual;
|
|
Private
|
|
RAR : RarHeaderRec;
|
|
Buf : Array[1..12] of Byte;
|
|
Offset : Word;
|
|
End;
|
|
|
|
Implementation
|
|
|
|
Constructor TRarArchive.Init;
|
|
Begin
|
|
End;
|
|
|
|
Procedure TRarArchive.FindFirst (Var SR : ArcSearchRec);
|
|
Begin
|
|
If Eof(ArcFile) Then Exit;
|
|
|
|
BlockRead (ArcFile, Buf[1], 12);
|
|
|
|
If Buf[10] <> $73 Then Exit;
|
|
|
|
BlockRead (ArcFile, offset, 2);
|
|
BlockRead (ArcFile, Buf[1], 6);
|
|
|
|
Seek (ArcFile, FilePos(ArcFile) + (offset - 13));
|
|
FindNext (SR);
|
|
End;
|
|
|
|
Procedure TRarArchive.FindNext (Var SR: ArcSearchRec);
|
|
Begin
|
|
If Eof(ArcFile) Then Exit;
|
|
|
|
BlockRead (ArcFile, Buf[1], 5);
|
|
|
|
If Buf[3] <> $74 Then Exit;
|
|
|
|
BlockRead (ArcFile, Offset, 2);
|
|
BlockRead (ArcFile, RAR, SizeOf(RAR));
|
|
BlockRead (ArcFile, SR.Name[1], RAR.FNSize);
|
|
|
|
SR.Name[0] := Chr(RAR.FNSize);
|
|
|
|
SR.Time := RAR.Time;
|
|
SR.Size := RAR.Size;
|
|
|
|
If RAR.Attr = 16 Then SR.Attr := $10;
|
|
|
|
Seek(ArcFile, FilePos(ArcFile) + (Offset - (SizeOf(RAR) + 7 + Length(SR.Name))) + RAR.PackSize);
|
|
End;
|
|
|
|
End. |