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Properly view files with comments now

This commit is contained in:
mysticbbs 2013-02-22 20:46:55 -05:00
parent 9aa572c41c
commit e6df923fe6
1 changed files with 43 additions and 46 deletions
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89
mystic/aviewrar.pas
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@ -2,30 +2,6 @@ Unit AViewRAR;
{$I M_OPS.PAS} {$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 Interface
Uses Uses
@ -34,6 +10,13 @@ Uses
Type Type
RarHeaderRec = Record RarHeaderRec = Record
CRC : Word;
HdrType : Byte;
Flags : Word;
Size : Word;
End;
RarFileRec = Record
PackSize : LongInt; PackSize : LongInt;
Size : LongInt; Size : LongInt;
HostOS : Byte; HostOS : Byte;
@ -48,12 +31,14 @@ Type
PRarArchive = ^TRarArchive; PRarArchive = ^TRarArchive;
TRarArchive = Object(TGeneralArchive) TRarArchive = Object(TGeneralArchive)
Constructor Init; Constructor Init;
Procedure FindFirst (Var SR : ArcSearchRec); Virtual; Procedure FindFirst (Var SR: ArcSearchRec); Virtual;
Procedure FindNext (Var SR : ArcSearchRec); Virtual; Procedure FindNext (Var SR: ArcSearchRec); Virtual;
Private Private
RAR : RarHeaderRec; RAR : RarFileRec;
Buf : Array[1..12] of Byte; Hdr : RarHeaderRec;
Offset : Word; ArcHdr : Array[1..7] of Byte;
NextPos : LongInt;
Offset : LongInt;
End; End;
Implementation Implementation
@ -66,37 +51,49 @@ Procedure TRarArchive.FindFirst (Var SR : ArcSearchRec);
Begin Begin
If Eof(ArcFile) Then Exit; If Eof(ArcFile) Then Exit;
BlockRead (ArcFile, Buf[1], 12); BlockRead (ArcFile, ArcHdr[1], 7); // marker header
BlockRead (ArcFile, Hdr, SizeOf(Hdr)); // archive header
If Buf[10] <> $73 Then Exit; If Hdr.HdrType <> $73 Then Exit;
BlockRead (ArcFile, offset, 2); NextPos := FilePos(ArcFile) + Hdr.Size - 7;
BlockRead (ArcFile, Buf[1], 6);
Seek (ArcFile, FilePos(ArcFile) + (offset - 13));
FindNext (SR); FindNext (SR);
End; End;
Procedure TRarArchive.FindNext (Var SR: ArcSearchRec); Procedure TRarArchive.FindNext (Var SR: ArcSearchRec);
Begin Begin
If Eof(ArcFile) Then Exit; Repeat
Seek (ArcFile, NextPos);
BlockRead (ArcFile, Buf[1], 5); If Eof(ArcFile) Then Exit;
If Buf[3] <> $74 Then Exit; BlockRead (ArcFile, Hdr, SizeOf(Hdr));
BlockRead (ArcFile, Offset, 2); If (Hdr.HdrType = $74) Then Begin
BlockRead (ArcFile, RAR, SizeOf(RAR)); BlockRead (ArcFile, RAR, SizeOf(RAR));
BlockRead (ArcFile, SR.Name[1], RAR.FNSize); BlockRead (ArcFile, SR.Name[1], RAR.FNSize);
SR.Name[0] := Chr(RAR.FNSize); SR.Name[0] := Chr(RAR.FNSize);
SR.Time := RAR.Time; If RAR.Attr = 16 Then SR.Attr := $10;
SR.Size := RAR.Size;
If RAR.Attr = 16 Then SR.Attr := $10; SR.Time := RAR.Time;
SR.Size := RAR.Size;
Seek(ArcFile, FilePos(ArcFile) + (Offset - (SizeOf(RAR) + 7 + Length(SR.Name))) + RAR.PackSize); NextPos := NextPos + Hdr.Size + RAR.PackSize;
Break;
End Else Begin
If (Hdr.Flags And $8000) = 0 Then
NextPos := NextPos + Hdr.Size
Else Begin
BlockRead (ArcFile, Offset , 4);
NextPos := NextPos + Hdr.Size + Offset;
End;
End;
Until Eof(ArcFile);
End; End;
End. End.