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uVimaDecode.pas
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uVimaDecode.pas
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{
******************************************************
DoubleFine Explorer
By Bennyboy
Http://quickandeasysoftware.net
******************************************************
}
{
Vima decoder
Original code by Jimmi Thøgersen (Serge)
(Very) minor tweaks by Bennyboy 2015
}
unit uVimaDecode;
interface
uses
classes, sysutils, uMemReader, uWaveWriter;
type
TCodec = (codecNULL, codecVIMA, codec0x0000, codec0x0001, codec0x0002, codec0x0003,
codec0x000A, codec0x000B, codec0x000C, codec0x000D, codec0x000F, codecUnknown);
function DecompressIMCToStream(SourceStream: TExplorerMemoryStream; DestStream: TStream):
boolean;
implementation
const
IMCTable1Size = 89;
IMCTable1 : array[0..IMCTable1Size-1] of word = (
$0007,$0008,$0009,$000A,$000B,$000C,$000D,$000E,$0010,$0011,
$0013,$0015,$0017,$0019,$001C,$001F,$0022,$0025,$0029,$002D,
$0032,$0037,$003C,$0042,$0049,$0050,$0058,$0061,$006B,$0076,
$0082,$008F,$009D,$00AD,$00BE,$00D1,$00E6,$00FD,$0117,$0133,
$0151,$0173,$0198,$01C1,$01EE,$0220,$0256,$0292,$02D4,$031C,
$036C,$03C3,$0424,$048E,$0502,$0583,$0610,$06AB,$0756,$0812,
$08E0,$09C3,$0ABD,$0BD0,$0CFF,$0E4C,$0FBA,$114C,$1307,$14EE,
$1706,$1954,$1BDC,$1EA5,$21B6,$2515,$28CA,$2CDF,$315B,$364B,
$3BB9,$41B2,$4844,$4F7E,$5771,$602F,$69CE,$7462,$7FFF
);
IMCTable2Size = 89;
IMCTable2 : array[0..IMCTable2Size-1] of byte = (
$04, $04, $04, $04, $04, $04, $04, $04, $04, $04,
$04, $04, $04, $04, $04, $04, $04, $04, $04, $04,
$04, $04, $04, $04, $04, $04, $04, $04, $04, $04,
$04, $04, $04, $04, $04, $04, $04, $04, $04, $04,
$04, $04, $04, $04, $04, $05, $05, $05, $05, $05,
$05, $05, $05, $05, $05, $05, $05, $05, $05, $06,
$06, $06, $06, $06, $06, $06, $06, $06, $06, $06,
$06, $06, $06, $06, $07, $07, $07, $07, $07, $07,
$07, $07, $07, $07, $07, $07, $07, $07, $07
);
IMCOtherTable1Size = 8;
IMCOtherTable1 : array[0..IMCOtherTable1Size-1] of byte = (
$FF, $04, $FF, $04, $00, $00, $00, $00 );
IMCOtherTable2Size = 8;
IMCOtherTable2 : array[0..IMCOtherTable2Size-1] of byte = (
$FF, $FF, $02, $06, $FF, $FF, $02, $06 );
IMCOtherTable3Size = 16;
IMCOtherTable3 : array[0..IMCOtherTable3Size-1] of byte = (
$FF, $FF, $FF, $FF, $01, $02, $04, $06,
$FF, $FF, $FF, $FF, $01, $02, $04, $06 );
IMCOtherTable4Size = 32;
IMCOtherTable4 : array[0..IMCOtherTable4Size-1] of byte = (
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $02, $02, $04, $05, $06,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $02, $02, $04, $05, $06 );
IMCOtherTable5Size = 64;
IMCOtherTable5 : array[0..IMCOtherTable5Size-1] of byte = (
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $01, $01, $02, $02, $02,
$02, $04, $04, $04, $05, $05, $06, $06,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $01, $01, $02, $02, $02,
$02, $04, $04, $04, $05, $05, $06, $06 );
IMCOtherTable6Size = 128;
IMCOtherTable6 : array[0..IMCOtherTable6Size-1] of byte = (
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $01, $01, $01, $01, $01,
$01, $01, $02, $02, $02, $02, $02, $02,
$02, $02, $04, $04, $04, $04, $04, $04,
$05, $05, $05, $05, $06, $06, $06, $06,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF,
$01, $01, $01, $01, $01, $01, $01, $01,
$01, $01, $02, $02, $02, $02, $02, $02,
$02, $02, $04, $04, $04, $04, $04, $04,
$05, $05, $05, $05, $06, $06, $06, $06 );
Offsets : array[0..7] of pointer =
(nil,
nil,
@IMCOtherTable1,
@IMCOtherTable2,
@IMCOtherTable3,
@IMCOtherTable4,
@IMCOtherTable5,
@IMCOtherTable6
);
function DecompressIMCToStream(SourceStream: TExplorerMemoryStream; DestStream: TStream):
boolean;
type
PCompInfo = ^TCompInfo;
TCompInfo = record
codec: TCodec;
CompSize: cardinal;
DecompSize: cardinal;
end;
THugeBuffer = array[0..$7FFFFFFF-1] of byte;
var
DestTablePos : longint;
DestTableStartPos: longint;
Incer: longint;
TableValue: longint;
Count: longint;
Put: word;
DestTable: array[0..5785] of word;
SBytes : array[0..3] of byte;
SWords : array[0..3] of word;
SourcePos: longint;
DestPos: longint;
SBytesPos: longint;
SWordsPos: longint;
CurrTablePos: longint;
DecLength: longint;
DestOffs: longint;
SWordsOffs: longint;
SourceBuffer: pointer;
EntrySize: cardinal;
NoOfEntries: cardinal;
TableEntry: cardinal;
DestPos_SWordsPos: cardinal;
DecsToDo: cardinal;
DecsLeft:cardinal;
BytesToDec: cardinal;
CurrTableVal: cardinal;
var40: cardinal;
NoOfEntriesDeced: cardinal;
OutputWord: longint;
Disp: longint;
FRMTOffs, RIFFOffs: longint;
DATAOffs: longint;
DATASize: cardinal;
BitsPerSample: cardinal;
SampleRate: cardinal;
Channels: cardinal;
BytesPerSec: cardinal;
BlockAlign: cardinal;
NoOfCompEntries: cardinal;
CompList: TList;
CompInfo: PCompInfo;
CodecNo: cardinal;
CodecName: string;
CodecPos: cardinal;
CodecOffset: cardinal;
n: cardinal;
CurrSourcePos: cardinal;
Buffer: pointer;
BufferPos: cardinal;
IMCTable1Pos: cardinal;
PrevOffset: cardinal;
WaveStream: TWaveStream;
begin
result := false;
try
DestTablePos:=0;
DestTableStartPos:=0;
Incer:=0;
repeat
//Label3
IMCTable1Pos:=0;
repeat
TableValue:=IMCTable1[IMCTable1Pos];
Count:=32;
Put:=0;
repeat
if (Incer and Count) <> 0 then
begin
Put:=Put+TableValue;
end;
TableValue:=TableValue shr 1;
Count:=Count shr 1;
until Count=0;
DestTable[DestTablePos]:=Put and $0000FFFF;
// DestTable[DestTablePos]:=word(Put);
Inc(IMCTable1Pos);
Inc(DestTablePos,64);
until IMCTable1Pos>=IMCTable1Size;
Inc(Incer);
Inc(DestTableStartPos);
DestTablePos:=DestTableStartPos;
until DestTableStartPos>=64;
SourceStream.Position := 0;
if SourceStream.ReadBlockName <> 'MCMP' then
exit;
SourceStream.Position := 4;
NoOfCompEntries:= SourceStream.ReadWordBE;
CodecOffset:={Chunk.Offset+}NoOfCompEntries*9+8;
CompList:=TList.Create;
for n:=0 to NoOfCompEntries - 1 do
begin
CompInfo:=PCompInfo(new(PCompInfo));
SourceStream.Position := 6+9*n;
CodecNo:= SourceStream.ReadByte;
CodecName:='';
for CodecPos:=CodecOffset+CodecNo*5 to CodecOffset+CodecNo*5+3 do
begin
SourceStream.Position := CodecPos;
CodecName:=CodecName+chr(SourceStream.ReadByte);
end;
if CodecName = 'VIMA' then
CompInfo^.Codec:=codecVIMA;
if CodecName = 'NULL' then
CompInfo^.Codec:=codecNULL;
if (CodecName <> 'NULL') and (CodecName <> 'VIMA') then
CompInfo^.Codec:=codecUnknown;
SourceStream.Position := 7+9*n;
CompInfo^.DecompSize:= SourceStream.ReadDWordBE;
SourceStream.Position := 11+9*n;
CompInfo^.CompSize:= SourceStream.ReadDWordBE;
CompList.Add(CompInfo);
end;
SourceStream.Position := CodecOffset-2;
CurrSourcePos:=CodecOffset+ SourceStream.ReadWordBE;
//Find the offsets of our 2 info blocks
FRMTOffs:= SourceStream.FindFileHeader('FRMT', 0, SourceStream.Size);
RIFFOffs := SourceStream.FindFileHeader('RIFF', 0, SourceStream.Size);
if FRMTOffs > -1 then
begin
SourceStream.Position := FRMTOffs+16;
BitsPerSample:= SourceStream.ReadDWordBE;
SourceStream.Position := FRMTOffs+20;
SampleRate:= SourceStream.ReadDWordBE;
SourceStream.Position := FRMTOffs+24;
Channels:= SourceStream.ReadDWordBE;
end
else
if RIFFOffs>-1 then //Speech files use RIFF block
begin
SourceStream.Position := RIFFOffs+22;
Channels:= SourceStream.ReadByte;
SourceStream.Seek(1, soFromCurrent);
SampleRate := SourceStream.ReadDWord;
SourceStream.Seek(6, soFromCurrent);
BitsPerSample := SourceStream.ReadByte;
end
else //Assume these values as no FRMT or RIFF blocks
begin
BitsPerSample:=16;
SampleRate:=22050;
Channels:=2;
end;
WaveStream := TWaveStream.Create(DestStream, Channels, BitsPerSample, SampleRate);
try
for n:=0 to CompList.Count-1 do
begin
CompInfo:=CompList.Items[n];
Buffer:=AllocMem(CompInfo^.DecompSize);
case CompInfo^.Codec of
codecNULL : begin
for BufferPos:=0 to CompInfo^.CompSize - 1 do
begin
SourceStream.Position := CurrSourcePos+BufferPos;
THugeBuffer(Buffer^)[BufferPos]:= SourceStream.ReadByte;
end;
end;
codecVIMA : begin
SourceBuffer:=AllocMem(CompInfo^.CompSize);
for BufferPos:=0 to CompInfo^.CompSize - 1 do
begin
SourceStream.Position := CurrSourcePos+BufferPos;
THugeBuffer(SourceBuffer^)[BufferPos]:= SourceStream.ReadByte;
end;
DecLength:=CompInfo^.DecompSize;
DestOffs:=integer(Buffer);
asm
PUSH esp
PUSH ebp
PUSH ebx
PUSH esi
PUSH edi
MOV ecx,SourceBuffer
MOV esi,1
MOV al,[ecx]
INC ecx
TEST al,al
MOV byte ptr SBytes[0],al
JGE @ReadWords
NOT al
MOV byte ptr SBytes[0],al
MOV esi,2
@ReadWords:
MOV ax,[ecx]
XOR edx,edx
MOV dh,al
ADD ecx,2
MOV dl,ah
CMP esi,1
MOV word ptr SWords[0],dx
JBE @OneWord
MOV al,[ecx]
INC ecx
MOV byte ptr SBytes[1],al
XOR edx,edx
MOV ax,[ecx]
ADD ecx,2
MOV dh,al
MOV dl,ah
MOV word ptr SWords[2],dx
@OneWord:
MOV eax,DecLength
MOV CurrTablePos,1
MOV EntrySize,esi
ADD esi,esi
XOR edx,edx
DIV esi
MOV DecsToDo,eax
MOV SourcePos,ecx
XOR ebx,ebx
MOV eax,CurrTablePos
XOR edi,edi
CMP eax,edi
JNZ @Label1
MOV SBytes[1],0
MOV SBytes[0],0
MOV word ptr SWords[2],di
MOV word ptr SWords[0],di
@Label1:
MOV esi,SourcePos
MOV edx,EntrySize
XOR ecx,ecx
MOV ch,[esi]
LEA eax,[esi+1]
XOR esi,esi
MOV cl,[eax]
INC eax
CMP edx,edi
MOV TableEntry,ecx
MOV SourcePos,eax
MOV SBytesPos,esi
JBE @ExitMainDec
MOV edi,DestOffs
LEA eax,SWords
SUB edi,eax
MOV SWordsPos,eax
MOV DestPos_SWordsPos,edi
@NextByte:
LEA ecx,[edi+eax]
MOV DestPos,ecx
MOVSX ecx,byte ptr SBytes[esi]
MOV CurrTablePos, ecx
MOVSX ecx, word ptr [eax]
MOV OutputWord,ecx
MOV ecx,DecsToDo
TEST ecx,ecx
JZ @Done
ADD edx,edx
MOV DecsLeft,ecx
MOV BytesToDec,edx
@NextDec:
MOV eax,CurrTablePos
MOV edx,1
MOV cl,byte ptr IMCTable2[eax]
MOV byte ptr CurrTableVal,cl
MOV esi,CurrTableVal
AND esi,$FF
ADD ebx,esi
LEA ecx,[esi-1]
MOV DestOffs,ebx
SHL edx,cl
MOV cl,$10
SUB cl,bl
MOV al,dl
DEC al
MOV byte ptr var40,al
MOV eax,TableEntry
MOV edi,var40
AND eax,$FFFF
SHR eax,cl
AND edi,$FF
MOV ecx,edx
OR ecx,edi
AND eax,ecx
CMP ebx,7
JLE @Label2
MOV ebx,SourcePos
XOR ecx,ecx
MOV ch,byte ptr TableEntry
MOVZX bx,byte ptr [ebx]
OR ecx,ebx
MOV ebx,SourcePos
INC ebx
MOV TableEntry,ecx
MOV SourcePos,ebx
MOV ebx,DestOffs
SUB ebx,8
MOV DestOffs,ebx
JMP @Label3
@Label2:
MOV ecx,TableEntry
@Label3:
TEST eax,edx
JZ @ClearEDX
XOR eax,edx
JMP @NoClear
@ClearEDX:
XOR edx,edx
@NoClear:
CMP eax,edi
JNZ @Label4
MOV edx,ecx
MOV ecx,ebx
SHL edx,cl
MOV ecx,SourcePos
MOVZX di,byte ptr [ecx]
PUSH ecx
//MOVSX ebp,dx
MOVSX ecx,dx
XOR edx,edx
AND ecx,$FFFFFF00
MOV OutputWord,ecx
POP ecx
MOV dh,byte ptr TableEntry
OR edx,edi
INC ecx
MOV SourcePos,ecx
MOV cx,8
SUB cx,bx
MOV edi,edx
SHR di,cl
XOR ecx,ecx
MOV ebx,DestOffs
MOV ch,dl
MOV edx,ecx
MOV ecx,SourcePos
AND edi,$FF
PUSH ecx
// OR ebp,edi
MOV ecx,OutputWord
OR ecx,edi
MOV OutputWord,ecx
POP ecx
MOVZX di,byte ptr [ecx]
OR edx,edi
INC ecx
MOV TableEntry,edx
MOV SourcePos,ecx
JMP @WriteDec
@Label4:
MOV ecx,7
MOV edi,eax
SUB ecx,esi
SHL edi,cl
MOV ecx,CurrTablePos
SHL ecx,6
OR edi,ecx
XOR ecx,ecx
TEST eax,eax
MOV cx,word ptr DestTable[edi*2]
MOV DestOffs,ecx
JZ @Label5
MOV edi,CurrTablePos
XOR ecx,ecx
MOV cx,word ptr IMCTable1[edi*2]
MOV edi,ecx
LEA ecx,[esi-1]
SHR edi,cl
MOV ecx,DestOffs
ADD ecx,edi
@Label5:
TEST edx,edx
JZ @Label6
NEG ecx
@Label6:
MOV edx,OutputWord
ADD edx,ecx
CMP edx,$FFFF8000
JGE @Label7
MOV edx,$FFFF8000
MOV OutputWord,edx
JMP @WriteDec
@Label7:
CMP edx,$7FFF
MOV OutputWord,edx
JLE @WriteDec
MOV edx,$7FFF
MOV OutputWord,edx
@WriteDec:
MOV ecx,DestPos
MOV edx,BytesToDec
PUSH eax
MOV eax,OutputWord
MOV [ecx],ax
ADD ecx,edx
MOV edx,dword ptr Offsets[esi*4]
MOV DestPos,ecx
MOV ecx,CurrTablePos
POP eax
MOVSX eax,byte ptr [edx+eax]
ADD ecx,eax
MOV CurrTablePos,ecx
JNS @Label8
MOV CurrTablePos,0
JMP @Done
@Label8:
MOV ecx,CurrTablePos
MOV eax,$58
CMP ecx,eax
JLE @Done
MOV CurrTablePos,eax
@Done:
MOV eax,DecsLeft
DEC eax
MOV DecsLeft,eax
JNZ @NextDec
MOV edx,EntrySize
MOV esi,SBytesPos
MOV eax,SWordsPos
MOV edi,DestPos_SWordsPos
MOV cl,byte ptr CurrTablePos
ADD eax,2
MOV byte ptr SBytes[esi],cl
PUSH ebx
MOV ebx,OutputWord
MOV [eax-2],bx
POP ebx
INC esi
MOV SWordsPos,eax
CMP esi,edx
MOV SBytesPos,esi
JB @NextByte
@ExitMainDec:
POP edi
POP esi
POP ebx
POP ebp
POP esp
end;
FreeMem(SourceBuffer);
end;
end;
Inc(CurrSourcePos,CompInfo^.CompSize);
if (n>0) {or (UpperCase(ExtractFileExt(InputFileName))='.WAV')} then
WaveStream.Write(Buffer^,CompInfo^.DecompSize);
FreeMem(Buffer);
end;
finally
WaveStream.Free;
result := true;
end;
for n:=0 to CompList.Count-1 do
begin
CompInfo:=CompList.Items[n];
Dispose(CompInfo);
end;
CompList.Free;
finally
//MainForm.StatusBar.Panels[0].GaugeAttrs.Position:=0;
//MainForm.Status(0,' ');
//Screen.Cursor:=crDefault;
end;
end;
end.