| 01eebc13 |
#include "rar.hpp"
#include "arccmt.cpp"
Archive::Archive(RAROptions *InitCmd)
{
Cmd=NULL; // Just in case we'll have an exception in 'new' below.
DummyCmd=(InitCmd==NULL);
Cmd=DummyCmd ? (new RAROptions):InitCmd;
OpenShared=Cmd->OpenShared;
Format=RARFMT15;
Solid=false;
Volume=false;
MainComment=false;
Locked=false;
Signed=false;
FirstVolume=false;
NewNumbering=false;
SFXSize=0;
LatestTime.Reset();
Protected=false;
Encrypted=false;
FailedHeaderDecryption=false;
BrokenHeader=false;
LastReadBlock=0;
CurBlockPos=0;
NextBlockPos=0;
memset(&MainHead,0,sizeof(MainHead));
memset(&CryptHead,0,sizeof(CryptHead));
memset(&EndArcHead,0,sizeof(EndArcHead));
VolNumber=0;
VolWrite=0;
AddingFilesSize=0;
AddingHeadersSize=0;
*FirstVolumeName=0;
Splitting=false;
NewArchive=false;
SilentOpen=false;
#ifdef USE_QOPEN
ProhibitQOpen=false;
#endif
}
Archive::~Archive()
{
if (DummyCmd)
delete Cmd;
}
void Archive::CheckArc(bool EnableBroken)
{
if (!IsArchive(EnableBroken))
{
// If FailedHeaderDecryption is set, we already reported that archive
// password is incorrect.
if (!FailedHeaderDecryption)
uiMsg(UIERROR_BADARCHIVE,FileName);
ErrHandler.Exit(RARX_FATAL);
}
}
#if !defined(SFX_MODULE)
void Archive::CheckOpen(const wchar *Name)
{
TOpen(Name);
CheckArc(false);
}
#endif
bool Archive::WCheckOpen(const wchar *Name)
{
if (!WOpen(Name))
return false;
if (!IsArchive(false))
{
uiMsg(UIERROR_BADARCHIVE,FileName);
Close();
return false;
}
return true;
}
RARFORMAT Archive::IsSignature(const byte *D,size_t Size)
{
RARFORMAT Type=RARFMT_NONE;
if (Size>=1 && D[0]==0x52)
#ifndef SFX_MODULE
if (Size>=4 && D[1]==0x45 && D[2]==0x7e && D[3]==0x5e)
Type=RARFMT14;
else
#endif
if (Size>=7 && D[1]==0x61 && D[2]==0x72 && D[3]==0x21 && D[4]==0x1a && D[5]==0x07)
{
// We check the last signature byte, so we can return a sensible
// warning in case we'll want to change the archive format
// sometimes in the future.
if (D[6]==0)
Type=RARFMT15;
else
if (D[6]==1)
Type=RARFMT50;
else
if (D[6]>1 && D[6]<5)
Type=RARFMT_FUTURE;
}
return Type;
}
bool Archive::IsArchive(bool EnableBroken)
{
Encrypted=false;
BrokenHeader=false; // Might be left from previous volume.
#ifndef SFX_MODULE
if (IsDevice())
{
uiMsg(UIERROR_INVALIDNAME,FileName,FileName);
return false;
}
#endif
if (Read(MarkHead.Mark,SIZEOF_MARKHEAD3)!=SIZEOF_MARKHEAD3)
return false;
SFXSize=0;
RARFORMAT Type;
if ((Type=IsSignature(MarkHead.Mark,SIZEOF_MARKHEAD3))!=RARFMT_NONE)
{
Format=Type;
if (Format==RARFMT14)
Seek(Tell()-SIZEOF_MARKHEAD3,SEEK_SET);
}
else
{
Array<char> Buffer(MAXSFXSIZE);
long CurPos=(long)Tell();
int ReadSize=Read(&Buffer[0],Buffer.Size()-16);
for (int I=0;I<ReadSize;I++)
if (Buffer[I]==0x52 && (Type=IsSignature((byte *)&Buffer[I],ReadSize-I))!=RARFMT_NONE)
{
Format=Type;
if (Format==RARFMT14 && I>0 && CurPos<28 && ReadSize>31)
{
char *D=&Buffer[28-CurPos];
if (D[0]!=0x52 || D[1]!=0x53 || D[2]!=0x46 || D[3]!=0x58)
continue;
}
SFXSize=CurPos+I;
Seek(SFXSize,SEEK_SET);
if (Format==RARFMT15 || Format==RARFMT50)
Read(MarkHead.Mark,SIZEOF_MARKHEAD3);
break;
}
if (SFXSize==0)
return false;
}
if (Format==RARFMT_FUTURE)
{
uiMsg(UIERROR_NEWRARFORMAT,FileName);
return false;
}
if (Format==RARFMT50) // RAR 5.0 signature is by one byte longer.
{
if (Read(MarkHead.Mark+SIZEOF_MARKHEAD3,1)!=1 || MarkHead.Mark[SIZEOF_MARKHEAD3]!=0)
return false;
MarkHead.HeadSize=SIZEOF_MARKHEAD5;
}
else
MarkHead.HeadSize=SIZEOF_MARKHEAD3;
#ifdef RARDLL
// If callback function is not set, we cannot get the password,
// so we skip the initial header processing for encrypted header archive.
// It leads to skipped archive comment, but the rest of archive data
// is processed correctly.
if (Cmd->Callback==NULL)
SilentOpen=true;
#endif
bool HeadersLeft; // Any headers left to read.
bool StartFound=false; // Main or encryption headers found.
// Skip the archive encryption header if any and read the main header.
while ((HeadersLeft=(ReadHeader()!=0))==true) // Additional parentheses to silence Clang.
{
SeekToNext();
HEADER_TYPE Type=GetHeaderType();
// In RAR 5.0 we need to quit after reading HEAD_CRYPT if we wish to
// avoid the password prompt.
StartFound=Type==HEAD_MAIN || SilentOpen && Type==HEAD_CRYPT;
if (StartFound)
break;
}
// This check allows to make RS based recovery even if password is incorrect.
// But we should not do it for EnableBroken or we'll get 'not RAR archive'
// messages when extracting encrypted archives with wrong password.
if (FailedHeaderDecryption && !EnableBroken)
return false;
if (BrokenHeader || !StartFound) // Main archive header is corrupt or missing.
{
if (!FailedHeaderDecryption) // If not reported a wrong password already.
uiMsg(UIERROR_MHEADERBROKEN,FileName);
if (!EnableBroken)
return false;
}
MainComment=MainHead.CommentInHeader;
// If we process non-encrypted archive or can request a password,
// we set 'first volume' flag based on file attributes below.
// It is necessary for RAR 2.x archives, which did not have 'first volume'
// flag in main header. Also for all RAR formats we need to scan until
// first file header to set "comment" flag when reading service header.
// Unless we are in silent mode, we need to know about presence of comment
// immediately after IsArchive call.
if (HeadersLeft && (!SilentOpen || !Encrypted))
{
SaveFilePos SavePos(*this);
int64 SaveCurBlockPos=CurBlockPos,SaveNextBlockPos=NextBlockPos;
HEADER_TYPE SaveCurHeaderType=CurHeaderType;
while (ReadHeader()!=0)
{
HEADER_TYPE HeaderType=GetHeaderType();
if (HeaderType==HEAD_SERVICE)
{
// If we have a split service headers, it surely indicates non-first
// volume. But not split service header does not guarantee the first
// volume, because we can have split file after non-split archive
// comment. So we do not quit from loop here.
FirstVolume=Volume && !SubHead.SplitBefore;
}
else
if (HeaderType==HEAD_FILE)
{
FirstVolume=Volume && !FileHead.SplitBefore;
break;
}
else
if (HeaderType==HEAD_ENDARC) // Might happen if archive contains only a split service header.
break;
SeekToNext();
}
CurBlockPos=SaveCurBlockPos;
NextBlockPos=SaveNextBlockPos;
CurHeaderType=SaveCurHeaderType;
}
if (!Volume || FirstVolume)
wcsncpyz(FirstVolumeName,FileName,ASIZE(FirstVolumeName));
return true;
}
void Archive::SeekToNext()
{
Seek(NextBlockPos,SEEK_SET);
}
// Calculate the block size including encryption fields and padding if any.
uint Archive::FullHeaderSize(size_t Size)
{
if (Encrypted)
{
Size = ALIGN_VALUE(Size, CRYPT_BLOCK_SIZE); // Align to encryption block size.
if (Format == RARFMT50)
Size += SIZE_INITV;
else
Size += SIZE_SALT30;
}
return uint(Size);
}
#ifdef USE_QOPEN
bool Archive::Open(const wchar *Name,uint Mode)
{
// Important if we reuse Archive object and it has virtual QOpen
// file position not matching real. For example, for 'l -v volname'.
QOpen.Unload();
return File::Open(Name,Mode);
}
int Archive::Read(void *Data,size_t Size)
{
size_t Result;
if (QOpen.Read(Data,Size,Result))
return (int)Result;
return File::Read(Data,Size);
}
void Archive::Seek(int64 Offset,int Method)
{
if (!QOpen.Seek(Offset,Method))
File::Seek(Offset,Method);
}
int64 Archive::Tell()
{
int64 QPos;
if (QOpen.Tell(&QPos))
return QPos;
return File::Tell();
}
#endif
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