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arcread.cpp
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arcread.cpp
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#include "rar.hpp"
size_t Archive::ReadHeader()
{
// Once we failed to decrypt an encrypted block, there is no reason to
// attempt to do it further. We'll never be successful and only generate
// endless errors.
if (FailedHeaderDecryption)
return 0;
CurBlockPos=Tell();
// Other developers asked us to initialize it to suppress "may be used
// uninitialized" warning in code below in some compilers.
size_t ReadSize=0;
switch(Format)
{
#ifndef SFX_MODULE
case RARFMT14:
ReadSize=ReadHeader14();
break;
#endif
case RARFMT15:
ReadSize=ReadHeader15();
break;
case RARFMT50:
ReadSize=ReadHeader50();
break;
}
// It is important to check ReadSize>0 here, because it is normal
// for RAR2 and RAR3 archives without end of archive block to have
// NextBlockPos==CurBlockPos after the end of archive has reached.
if (ReadSize>0 && NextBlockPos<=CurBlockPos)
{
BrokenHeaderMsg();
ReadSize=0;
}
if (ReadSize==0)
CurHeaderType=HEAD_UNKNOWN;
return ReadSize;
}
size_t Archive::SearchBlock(HEADER_TYPE HeaderType)
{
size_t Size,Count=0;
while ((Size=ReadHeader())!=0 &&
(HeaderType==HEAD_ENDARC || GetHeaderType()!=HEAD_ENDARC))
{
if ((++Count & 127)==0)
Wait();
if (GetHeaderType()==HeaderType)
return Size;
SeekToNext();
}
return 0;
}
size_t Archive::SearchSubBlock(const wchar *Type)
{
size_t Size,Count=0;
while ((Size=ReadHeader())!=0 && GetHeaderType()!=HEAD_ENDARC)
{
if ((++Count & 127)==0)
Wait();
if (GetHeaderType()==HEAD_SERVICE && SubHead.CmpName(Type))
return Size;
SeekToNext();
}
return 0;
}
size_t Archive::SearchRR()
{
// If locator extra field is available for recovery record, let's utilize it.
if (MainHead.Locator && MainHead.RROffset!=0)
{
uint64 CurPos=Tell();
Seek(MainHead.RROffset,SEEK_SET);
size_t Size=ReadHeader();
if (Size!=0 && !BrokenHeader && GetHeaderType()==HEAD_SERVICE && SubHead.CmpName(SUBHEAD_TYPE_RR))
return Size;
Seek(CurPos,SEEK_SET);
}
// Otherwise scan the entire archive to find the recovery record.
return SearchSubBlock(SUBHEAD_TYPE_RR);
}
void Archive::UnexpEndArcMsg()
{
int64 ArcSize=FileLength();
// If block positions are equal to file size, this is not an error.
// It can happen when we reached the end of older RAR 1.5 archive,
// which did not have the end of archive block.
if (CurBlockPos!=ArcSize || NextBlockPos!=ArcSize)
{
uiMsg(UIERROR_UNEXPEOF,FileName);
ErrHandler.SetErrorCode(RARX_WARNING);
}
}
void Archive::BrokenHeaderMsg()
{
uiMsg(UIERROR_HEADERBROKEN,FileName);
BrokenHeader=true;
ErrHandler.SetErrorCode(RARX_CRC);
}
void Archive::UnkEncVerMsg(const wchar *Name,const wchar *Info)
{
uiMsg(UIERROR_UNKNOWNENCMETHOD,FileName,Name,Info);
ErrHandler.SetErrorCode(RARX_WARNING);
}
// Return f in case of signed integer overflow or negative parameters
// or v1+v2 otherwise. We use it for file offsets, which are signed
// for compatibility with off_t in POSIX file functions and third party code.
// Signed integer overflow is the undefined behavior according to
// C++ standard and it causes fuzzers to complain.
inline int64 SafeAdd(int64 v1,int64 v2,int64 f)
{
return v1>=0 && v2>=0 && v1<=MAX_INT64-v2 ? v1+v2 : f;
}
size_t Archive::ReadHeader15()
{
RawRead Raw(this);
bool Decrypt=Encrypted && CurBlockPos>(int64)SFXSize+SIZEOF_MARKHEAD3;
if (Decrypt)
{
#ifdef RAR_NOCRYPT // For rarext.dll and unrar_nocrypt.dll.
return 0;
#else
RequestArcPassword();
byte Salt[SIZE_SALT30];
if (Read(Salt,SIZE_SALT30)!=SIZE_SALT30)
{
UnexpEndArcMsg();
return 0;
}
HeadersCrypt.SetCryptKeys(false,CRYPT_RAR30,&Cmd->Password,Salt,NULL,0,NULL,NULL);
Raw.SetCrypt(&HeadersCrypt);
#endif
}
Raw.Read(SIZEOF_SHORTBLOCKHEAD);
if (Raw.Size()==0)
{
UnexpEndArcMsg();
return 0;
}
ShortBlock.HeadCRC=Raw.Get2();
ShortBlock.Reset();
uint HeaderType=Raw.Get1();
ShortBlock.Flags=Raw.Get2();
ShortBlock.SkipIfUnknown=(ShortBlock.Flags & SKIP_IF_UNKNOWN)!=0;
ShortBlock.HeadSize=Raw.Get2();
ShortBlock.HeaderType=(HEADER_TYPE)HeaderType;
if (ShortBlock.HeadSize<SIZEOF_SHORTBLOCKHEAD)
{
BrokenHeaderMsg();
return 0;
}
// For simpler further processing we map header types common
// for RAR 1.5 and 5.0 formats to RAR 5.0 values. It does not include
// header types specific for RAR 1.5 - 4.x only.
switch(ShortBlock.HeaderType)
{
case HEAD3_MAIN: ShortBlock.HeaderType=HEAD_MAIN; break;
case HEAD3_FILE: ShortBlock.HeaderType=HEAD_FILE; break;
case HEAD3_SERVICE: ShortBlock.HeaderType=HEAD_SERVICE; break;
case HEAD3_ENDARC: ShortBlock.HeaderType=HEAD_ENDARC; break;
}
CurHeaderType=ShortBlock.HeaderType;
if (ShortBlock.HeaderType==HEAD3_CMT)
{
// Old style (up to RAR 2.9) comment header embedded into main
// or file header. We must not read the entire ShortBlock.HeadSize here
// to not break the comment processing logic later.
Raw.Read(SIZEOF_COMMHEAD-SIZEOF_SHORTBLOCKHEAD);
}
else
if (ShortBlock.HeaderType==HEAD_MAIN && (ShortBlock.Flags & MHD_COMMENT)!=0)
{
// Old style (up to RAR 2.9) main archive comment embedded into
// the main archive header found. While we can read the entire
// ShortBlock.HeadSize here and remove this part of "if", it would be
// waste of memory, because we'll read and process this comment data
// in other function anyway and we do not need them here now.
Raw.Read(SIZEOF_MAINHEAD3-SIZEOF_SHORTBLOCKHEAD);
}
else
Raw.Read(ShortBlock.HeadSize-SIZEOF_SHORTBLOCKHEAD);
NextBlockPos=CurBlockPos+FullHeaderSize(ShortBlock.HeadSize);
switch(ShortBlock.HeaderType)
{
case HEAD_MAIN:
MainHead.Reset();
*(BaseBlock *)&MainHead=ShortBlock;
MainHead.HighPosAV=Raw.Get2();
MainHead.PosAV=Raw.Get4();
Volume=(MainHead.Flags & MHD_VOLUME)!=0;
Solid=(MainHead.Flags & MHD_SOLID)!=0;
Locked=(MainHead.Flags & MHD_LOCK)!=0;
Protected=(MainHead.Flags & MHD_PROTECT)!=0;
Encrypted=(MainHead.Flags & MHD_PASSWORD)!=0;
Signed=MainHead.PosAV!=0 || MainHead.HighPosAV!=0;
MainHead.CommentInHeader=(MainHead.Flags & MHD_COMMENT)!=0;
// Only for encrypted 3.0+ archives. 2.x archives did not have this
// flag, so for non-encrypted archives, we'll set it later based on
// file attributes.
FirstVolume=(MainHead.Flags & MHD_FIRSTVOLUME)!=0;
NewNumbering=(MainHead.Flags & MHD_NEWNUMBERING)!=0;
break;
case HEAD_FILE:
case HEAD_SERVICE:
{
bool FileBlock=ShortBlock.HeaderType==HEAD_FILE;
FileHeader *hd=FileBlock ? &FileHead:&SubHead;
hd->Reset();
*(BaseBlock *)hd=ShortBlock;
hd->SplitBefore=(hd->Flags & LHD_SPLIT_BEFORE)!=0;
hd->SplitAfter=(hd->Flags & LHD_SPLIT_AFTER)!=0;
hd->Encrypted=(hd->Flags & LHD_PASSWORD)!=0;
hd->SaltSet=(hd->Flags & LHD_SALT)!=0;
hd->Solid=FileBlock && (hd->Flags & LHD_SOLID)!=0;
hd->SubBlock=!FileBlock && (hd->Flags & LHD_SOLID)!=0;
hd->Dir=(hd->Flags & LHD_WINDOWMASK)==LHD_DIRECTORY;
hd->WinSize=hd->Dir ? 0:0x10000<<((hd->Flags & LHD_WINDOWMASK)>>5);
hd->CommentInHeader=(hd->Flags & LHD_COMMENT)!=0;
hd->Version=(hd->Flags & LHD_VERSION)!=0;
hd->DataSize=Raw.Get4();
uint LowUnpSize=Raw.Get4();
hd->HostOS=Raw.Get1();
hd->FileHash.Type=HASH_CRC32;
hd->FileHash.CRC32=Raw.Get4();
uint FileTime=Raw.Get4();
hd->UnpVer=Raw.Get1();
// RAR15 did not use the special dictionary size to mark dirs.
if (hd->UnpVer<20 && (hd->FileAttr & 0x10)!=0)
hd->Dir=true;
hd->Method=Raw.Get1()-0x30;
size_t NameSize=Raw.Get2();
hd->FileAttr=Raw.Get4();
hd->CryptMethod=CRYPT_NONE;
if (hd->Encrypted)
switch(hd->UnpVer)
{
case 13: hd->CryptMethod=CRYPT_RAR13; break;
case 15: hd->CryptMethod=CRYPT_RAR15; break;
case 20:
case 26: hd->CryptMethod=CRYPT_RAR20; break;
default: hd->CryptMethod=CRYPT_RAR30; break;
}
hd->HSType=HSYS_UNKNOWN;
if (hd->HostOS==HOST_UNIX || hd->HostOS==HOST_BEOS)
hd->HSType=HSYS_UNIX;
else
if (hd->HostOS<HOST_MAX)
hd->HSType=HSYS_WINDOWS;
hd->RedirType=FSREDIR_NONE;
// RAR 4.x Unix symlink.
if (hd->HostOS==HOST_UNIX && (hd->FileAttr & 0xF000)==0xA000)
{
hd->RedirType=FSREDIR_UNIXSYMLINK;
*hd->RedirName=0;
}
hd->Inherited=!FileBlock && (hd->SubFlags & SUBHEAD_FLAGS_INHERITED)!=0;
hd->LargeFile=(hd->Flags & LHD_LARGE)!=0;
uint HighPackSize,HighUnpSize;
if (hd->LargeFile)
{
HighPackSize=Raw.Get4();
HighUnpSize=Raw.Get4();
hd->UnknownUnpSize=(LowUnpSize==0xffffffff && HighUnpSize==0xffffffff);
}
else
{
HighPackSize=HighUnpSize=0;
// UnpSize equal to 0xffffffff without LHD_LARGE flag indicates
// that we do not know the unpacked file size and must unpack it
// until we find the end of file marker in compressed data.
hd->UnknownUnpSize=(LowUnpSize==0xffffffff);
}
hd->PackSize=INT32TO64(HighPackSize,hd->DataSize);
hd->UnpSize=INT32TO64(HighUnpSize,LowUnpSize);
if (hd->UnknownUnpSize)
hd->UnpSize=INT64NDF;
char FileName[NM*4];
size_t ReadNameSize=Min(NameSize,ASIZE(FileName)-1);
Raw.GetB((byte *)FileName,ReadNameSize);
FileName[ReadNameSize]=0;
if (FileBlock)
{
*hd->FileName=0;
if ((hd->Flags & LHD_UNICODE)!=0)
{
EncodeFileName NameCoder;
size_t Length=strlen(FileName);
Length++;
if (ReadNameSize>Length)
NameCoder.Decode(FileName,ReadNameSize,(byte *)FileName+Length,
ReadNameSize-Length,hd->FileName,
ASIZE(hd->FileName));
}
if (*hd->FileName==0)
ArcCharToWide(FileName,hd->FileName,ASIZE(hd->FileName),ACTW_OEM);
#ifndef SFX_MODULE
ConvertNameCase(hd->FileName);
#endif
ConvertFileHeader(hd);
}
else
{
CharToWide(FileName,hd->FileName,ASIZE(hd->FileName));
// Calculate the size of optional data.
int DataSize=int(hd->HeadSize-NameSize-SIZEOF_FILEHEAD3);
if ((hd->Flags & LHD_SALT)!=0)
DataSize-=SIZE_SALT30;
if (DataSize>0)
{
// Here we read optional additional fields for subheaders.
// They are stored after the file name and before salt.
hd->SubData.Alloc(DataSize);
Raw.GetB(&hd->SubData[0],DataSize);
}
if (hd->CmpName(SUBHEAD_TYPE_CMT))
MainComment=true;
}
if ((hd->Flags & LHD_SALT)!=0)
Raw.GetB(hd->Salt,SIZE_SALT30);
hd->mtime.SetDos(FileTime);
if ((hd->Flags & LHD_EXTTIME)!=0)
{
ushort Flags=Raw.Get2();
RarTime *tbl[4];
tbl[0]=&FileHead.mtime;
tbl[1]=&FileHead.ctime;
tbl[2]=&FileHead.atime;
tbl[3]=NULL; // Archive time is not used now.
for (int I=0;I<4;I++)
{
RarTime *CurTime=tbl[I];
uint rmode=Flags>>(3-I)*4;
if ((rmode & 8)==0 || CurTime==NULL)
continue;
if (I!=0)
{
uint DosTime=Raw.Get4();
CurTime->SetDos(DosTime);
}
RarLocalTime rlt;
CurTime->GetLocal(&rlt);
if (rmode & 4)
rlt.Second++;
rlt.Reminder=0;
int count=rmode&3;
for (int J=0;J<count;J++)
{
byte CurByte=Raw.Get1();
rlt.Reminder|=(((uint)CurByte)<<((J+3-count)*8));
}
// Convert from 100ns RAR precision to REMINDER_PRECISION.
rlt.Reminder*=RarTime::REMINDER_PRECISION/10000000;
CurTime->SetLocal(&rlt);
}
}
// Set to 0 in case of overflow, so end of ReadHeader cares about it.
NextBlockPos=SafeAdd(NextBlockPos,hd->PackSize,0);
bool CRCProcessedOnly=hd->CommentInHeader;
ushort HeaderCRC=Raw.GetCRC15(CRCProcessedOnly);
if (hd->HeadCRC!=HeaderCRC)
{
BrokenHeader=true;
ErrHandler.SetErrorCode(RARX_WARNING);
// If we have a broken encrypted header, we do not need to display
// the error message here, because it will be displayed for such
// headers later in this function. Also such headers are unlikely
// to have anything sensible in file name field, so it is useless
// to display the file name.
if (!Decrypt)
uiMsg(UIERROR_FHEADERBROKEN,Archive::FileName,hd->FileName);
}
}
break;
case HEAD_ENDARC:
*(BaseBlock *)&EndArcHead=ShortBlock;
EndArcHead.NextVolume=(EndArcHead.Flags & EARC_NEXT_VOLUME)!=0;
EndArcHead.DataCRC=(EndArcHead.Flags & EARC_DATACRC)!=0;
EndArcHead.RevSpace=(EndArcHead.Flags & EARC_REVSPACE)!=0;
EndArcHead.StoreVolNumber=(EndArcHead.Flags & EARC_VOLNUMBER)!=0;
if (EndArcHead.DataCRC)
EndArcHead.ArcDataCRC=Raw.Get4();
if (EndArcHead.StoreVolNumber)
VolNumber=EndArcHead.VolNumber=Raw.Get2();
break;
#ifndef SFX_MODULE
case HEAD3_CMT:
*(BaseBlock *)&CommHead=ShortBlock;
CommHead.UnpSize=Raw.Get2();
CommHead.UnpVer=Raw.Get1();
CommHead.Method=Raw.Get1();
CommHead.CommCRC=Raw.Get2();
break;
case HEAD3_PROTECT:
*(BaseBlock *)&ProtectHead=ShortBlock;
ProtectHead.DataSize=Raw.Get4();
ProtectHead.Version=Raw.Get1();
ProtectHead.RecSectors=Raw.Get2();
ProtectHead.TotalBlocks=Raw.Get4();
Raw.GetB(ProtectHead.Mark,8);
NextBlockPos+=ProtectHead.DataSize;
break;
case HEAD3_OLDSERVICE: // RAR 2.9 and earlier.
*(BaseBlock *)&SubBlockHead=ShortBlock;
SubBlockHead.DataSize=Raw.Get4();
NextBlockPos+=SubBlockHead.DataSize;
SubBlockHead.SubType=Raw.Get2();
SubBlockHead.Level=Raw.Get1();
switch(SubBlockHead.SubType)
{
case UO_HEAD:
*(SubBlockHeader *)&UOHead=SubBlockHead;
UOHead.OwnerNameSize=Raw.Get2();
UOHead.GroupNameSize=Raw.Get2();
if (UOHead.OwnerNameSize>=ASIZE(UOHead.OwnerName))
UOHead.OwnerNameSize=ASIZE(UOHead.OwnerName)-1;
if (UOHead.GroupNameSize>=ASIZE(UOHead.GroupName))
UOHead.GroupNameSize=ASIZE(UOHead.GroupName)-1;
Raw.GetB(UOHead.OwnerName,UOHead.OwnerNameSize);
Raw.GetB(UOHead.GroupName,UOHead.GroupNameSize);
UOHead.OwnerName[UOHead.OwnerNameSize]=0;
UOHead.GroupName[UOHead.GroupNameSize]=0;
break;
case NTACL_HEAD:
*(SubBlockHeader *)&EAHead=SubBlockHead;
EAHead.UnpSize=Raw.Get4();
EAHead.UnpVer=Raw.Get1();
EAHead.Method=Raw.Get1();
EAHead.EACRC=Raw.Get4();
break;
case STREAM_HEAD:
*(SubBlockHeader *)&StreamHead=SubBlockHead;
StreamHead.UnpSize=Raw.Get4();
StreamHead.UnpVer=Raw.Get1();
StreamHead.Method=Raw.Get1();
StreamHead.StreamCRC=Raw.Get4();
StreamHead.StreamNameSize=Raw.Get2();
if (StreamHead.StreamNameSize>=ASIZE(StreamHead.StreamName))
StreamHead.StreamNameSize=ASIZE(StreamHead.StreamName)-1;
Raw.GetB(StreamHead.StreamName,StreamHead.StreamNameSize);
StreamHead.StreamName[StreamHead.StreamNameSize]=0;
break;
}
break;
#endif
default:
if (ShortBlock.Flags & LONG_BLOCK)
NextBlockPos+=Raw.Get4();
break;
}
ushort HeaderCRC=Raw.GetCRC15(false);
// Old AV header does not have header CRC properly set.
if (ShortBlock.HeadCRC!=HeaderCRC && ShortBlock.HeaderType!=HEAD3_SIGN &&
ShortBlock.HeaderType!=HEAD3_AV)
{
bool Recovered=false;
if (ShortBlock.HeaderType==HEAD_ENDARC && EndArcHead.RevSpace)
{
// Last 7 bytes of recovered volume can contain zeroes, because
// REV files store its own information (volume number, etc.) here.
SaveFilePos SavePos(*this);
int64 Length=Tell();
Seek(Length-7,SEEK_SET);
Recovered=true;
for (int J=0;J<7;J++)
if (GetByte()!=0)
Recovered=false;
}
if (!Recovered)
{
BrokenHeader=true;
ErrHandler.SetErrorCode(RARX_CRC);
if (Decrypt)
{
uiMsg(UIERROR_CHECKSUMENC,FileName,FileName);
FailedHeaderDecryption=true;
return 0;
}
}
}
return Raw.Size();
}
size_t Archive::ReadHeader50()
{
RawRead Raw(this);
bool Decrypt=Encrypted && CurBlockPos>(int64)SFXSize+SIZEOF_MARKHEAD5;
if (Decrypt)
{
#if defined(RAR_NOCRYPT)
return 0;
#else
byte HeadersInitV[SIZE_INITV];
if (Read(HeadersInitV,SIZE_INITV)!=SIZE_INITV)
{
UnexpEndArcMsg();
return 0;
}
// We repeat the password request only for manually entered passwords
// and not for -p<pwd>. Wrong password can be intentionally provided
// in -p<pwd> to not stop batch processing for encrypted archives.
bool GlobalPassword=Cmd->Password.IsSet() || uiIsGlobalPasswordSet();
while (true) // Repeat the password prompt for wrong passwords.
{
RequestArcPassword();
byte PswCheck[SIZE_PSWCHECK];
HeadersCrypt.SetCryptKeys(false,CRYPT_RAR50,&Cmd->Password,CryptHead.Salt,HeadersInitV,CryptHead.Lg2Count,NULL,PswCheck);
// Verify password validity.
if (CryptHead.UsePswCheck && memcmp(PswCheck,CryptHead.PswCheck,SIZE_PSWCHECK)!=0)
{
if (GlobalPassword) // For -p<pwd> or Ctrl+P.
{
// This message is used by Android GUI to reset cached passwords.
// Update appropriate code if changed.
uiMsg(UIERROR_BADPSW,FileName);
FailedHeaderDecryption=true;
ErrHandler.SetErrorCode(RARX_BADPWD);
return 0;
}
else // For passwords entered manually.
{
// This message is used by Android GUI and Windows GUI and SFX to
// reset cached passwords. Update appropriate code if changed.
uiMsg(UIWAIT_BADPSW,FileName);
Cmd->Password.Clean();
}
#ifdef RARDLL
// Avoid new requests for unrar.dll to prevent the infinite loop
// if app always returns the same password.
ErrHandler.SetErrorCode(RARX_BADPWD);
Cmd->DllError=ERAR_BAD_PASSWORD;
ErrHandler.Exit(RARX_BADPWD);
#else
continue; // Request a password again.
#endif
}
break;
}
Raw.SetCrypt(&HeadersCrypt);
#endif
}
// Header size must not occupy more than 3 variable length integer bytes
// resulting in 2 MB maximum header size (MAX_HEADER_SIZE_RAR5),
// so here we read 4 byte CRC32 followed by 3 bytes or less of header size.
const size_t FirstReadSize=7; // Smallest possible block size.
if (Raw.Read(FirstReadSize)<FirstReadSize)
{
UnexpEndArcMsg();
return 0;
}
ShortBlock.Reset();
ShortBlock.HeadCRC=Raw.Get4();
uint SizeBytes=Raw.GetVSize(4);
uint64 BlockSize=Raw.GetV();
if (BlockSize==0 || SizeBytes==0)
{
BrokenHeaderMsg();
return 0;
}
int SizeToRead=int(BlockSize);
SizeToRead-=FirstReadSize-SizeBytes-4; // Adjust overread size bytes if any.
uint HeaderSize=4+SizeBytes+(uint)BlockSize;
if (SizeToRead<0 || HeaderSize<SIZEOF_SHORTBLOCKHEAD5)
{
BrokenHeaderMsg();
return 0;
}
Raw.Read(SizeToRead);
if (Raw.Size()<HeaderSize)
{
UnexpEndArcMsg();
return 0;
}
uint HeaderCRC=Raw.GetCRC50();
ShortBlock.HeaderType=(HEADER_TYPE)Raw.GetV();
ShortBlock.Flags=(uint)Raw.GetV();
ShortBlock.SkipIfUnknown=(ShortBlock.Flags & HFL_SKIPIFUNKNOWN)!=0;
ShortBlock.HeadSize=HeaderSize;
CurHeaderType=ShortBlock.HeaderType;
bool BadCRC=(ShortBlock.HeadCRC!=HeaderCRC);
if (BadCRC)
{
BrokenHeaderMsg(); // Report, but attempt to process.
BrokenHeader=true;
ErrHandler.SetErrorCode(RARX_CRC);
if (Decrypt)
{
uiMsg(UIERROR_CHECKSUMENC,FileName,FileName);
FailedHeaderDecryption=true;
return 0;
}
}
uint64 ExtraSize=0;
if ((ShortBlock.Flags & HFL_EXTRA)!=0)
{
ExtraSize=Raw.GetV();
if (ExtraSize>=ShortBlock.HeadSize)
{
BrokenHeaderMsg();
return 0;
}
}
uint64 DataSize=0;
if ((ShortBlock.Flags & HFL_DATA)!=0)
DataSize=Raw.GetV();
NextBlockPos=CurBlockPos+FullHeaderSize(ShortBlock.HeadSize);
// Set to 0 in case of overflow, so end of ReadHeader cares about it.
NextBlockPos=SafeAdd(NextBlockPos,DataSize,0);
switch(ShortBlock.HeaderType)
{
case HEAD_CRYPT:
{
*(BaseBlock *)&CryptHead=ShortBlock;
uint CryptVersion=(uint)Raw.GetV();
if (CryptVersion>CRYPT_VERSION)
{
wchar Info[20];
swprintf(Info,ASIZE(Info),L"h%u",CryptVersion);
UnkEncVerMsg(FileName,Info);
return 0;
}
uint EncFlags=(uint)Raw.GetV();
CryptHead.UsePswCheck=(EncFlags & CHFL_CRYPT_PSWCHECK)!=0;
CryptHead.Lg2Count=Raw.Get1();
if (CryptHead.Lg2Count>CRYPT5_KDF_LG2_COUNT_MAX)
{
wchar Info[20];
swprintf(Info,ASIZE(Info),L"hc%u",CryptHead.Lg2Count);
UnkEncVerMsg(FileName,Info);
return 0;
}
Raw.GetB(CryptHead.Salt,SIZE_SALT50);
if (CryptHead.UsePswCheck)
{
Raw.GetB(CryptHead.PswCheck,SIZE_PSWCHECK);
byte csum[SIZE_PSWCHECK_CSUM];
Raw.GetB(csum,SIZE_PSWCHECK_CSUM);
sha256_context ctx;
sha256_init(&ctx);
sha256_process(&ctx, CryptHead.PswCheck, SIZE_PSWCHECK);
byte Digest[SHA256_DIGEST_SIZE];
sha256_done(&ctx, Digest);
CryptHead.UsePswCheck=memcmp(csum,Digest,SIZE_PSWCHECK_CSUM)==0;
}
Encrypted=true;
}
break;
case HEAD_MAIN:
{
MainHead.Reset();
*(BaseBlock *)&MainHead=ShortBlock;
uint ArcFlags=(uint)Raw.GetV();
Volume=(ArcFlags & MHFL_VOLUME)!=0;
Solid=(ArcFlags & MHFL_SOLID)!=0;
Locked=(ArcFlags & MHFL_LOCK)!=0;
Protected=(ArcFlags & MHFL_PROTECT)!=0;
Signed=false;
NewNumbering=true;
if ((ArcFlags & MHFL_VOLNUMBER)!=0)
VolNumber=(uint)Raw.GetV();
else
VolNumber=0;
FirstVolume=Volume && VolNumber==0;
if (ExtraSize!=0)
ProcessExtra50(&Raw,(size_t)ExtraSize,&MainHead);
#ifdef USE_QOPEN
if (!ProhibitQOpen && MainHead.Locator && MainHead.QOpenOffset>0 && Cmd->QOpenMode!=QOPEN_NONE)
{
// We seek to QO block in the end of archive when processing
// QOpen.Load, so we need to preserve current block positions
// to not break normal archive processing by calling function.
int64 SaveCurBlockPos=CurBlockPos,SaveNextBlockPos=NextBlockPos;
HEADER_TYPE SaveCurHeaderType=CurHeaderType;
QOpen.Init(this,false);
QOpen.Load(MainHead.QOpenOffset);
CurBlockPos=SaveCurBlockPos;
NextBlockPos=SaveNextBlockPos;
CurHeaderType=SaveCurHeaderType;
}
#endif
}
break;
case HEAD_FILE:
case HEAD_SERVICE:
{
FileHeader *hd=ShortBlock.HeaderType==HEAD_FILE ? &FileHead:&SubHead;
hd->Reset();
*(BaseBlock *)hd=ShortBlock;
bool FileBlock=ShortBlock.HeaderType==HEAD_FILE;
hd->LargeFile=true;
hd->PackSize=DataSize;
hd->FileFlags=(uint)Raw.GetV();
hd->UnpSize=Raw.GetV();
hd->UnknownUnpSize=(hd->FileFlags & FHFL_UNPUNKNOWN)!=0;
if (hd->UnknownUnpSize)
hd->UnpSize=INT64NDF;
hd->MaxSize=Max(hd->PackSize,hd->UnpSize);
hd->FileAttr=(uint)Raw.GetV();
if ((hd->FileFlags & FHFL_UTIME)!=0)
hd->mtime.SetUnix((time_t)Raw.Get4());
hd->FileHash.Type=HASH_NONE;
if ((hd->FileFlags & FHFL_CRC32)!=0)
{
hd->FileHash.Type=HASH_CRC32;
hd->FileHash.CRC32=Raw.Get4();
}
hd->RedirType=FSREDIR_NONE;
uint CompInfo=(uint)Raw.GetV();
hd->Method=(CompInfo>>7) & 7;
// "+ 50" to not mix with old RAR format algorithms. For example,
// we may need to use the compression algorithm 15 in the future,
// but it was already used in RAR 1.5 and Unpack needs to distinguish
// them.
hd->UnpVer=(CompInfo & 0x3f) + 50;
if (hd->UnpVer!=50) // Only 5.0 compression is known now.
hd->UnpVer=VER_UNKNOWN;
hd->HostOS=(byte)Raw.GetV();
size_t NameSize=(size_t)Raw.GetV();
hd->Inherited=(ShortBlock.Flags & HFL_INHERITED)!=0;
hd->HSType=HSYS_UNKNOWN;
if (hd->HostOS==HOST5_UNIX)
hd->HSType=HSYS_UNIX;
else
if (hd->HostOS==HOST5_WINDOWS)
hd->HSType=HSYS_WINDOWS;
hd->SplitBefore=(hd->Flags & HFL_SPLITBEFORE)!=0;
hd->SplitAfter=(hd->Flags & HFL_SPLITAFTER)!=0;
hd->SubBlock=(hd->Flags & HFL_CHILD)!=0;
hd->Solid=FileBlock && (CompInfo & FCI_SOLID)!=0;
hd->Dir=(hd->FileFlags & FHFL_DIRECTORY)!=0;
hd->WinSize=hd->Dir ? 0:size_t(0x20000)<<((CompInfo>>10)&0xf);
hd->CryptMethod=hd->Encrypted ? CRYPT_RAR50:CRYPT_NONE;
char FileName[NM*4];
size_t ReadNameSize=Min(NameSize,ASIZE(FileName)-1);
Raw.GetB((byte *)FileName,ReadNameSize);
FileName[ReadNameSize]=0;
UtfToWide(FileName,hd->FileName,ASIZE(hd->FileName));
// Should do it before converting names, because extra fields can
// affect name processing, like in case of NTFS streams.
if (ExtraSize!=0)
ProcessExtra50(&Raw,(size_t)ExtraSize,hd);
if (FileBlock)
{
#ifndef SFX_MODULE
ConvertNameCase(hd->FileName);
#endif
ConvertFileHeader(hd);
}
if (!FileBlock && hd->CmpName(SUBHEAD_TYPE_CMT))
MainComment=true;
#if 0
// For RAR5 format we read the user specified recovery percent here.
// It would be useful to do it for shell extension too, so we display
// the correct recovery record size in archive properties. But then
// we would need to include the entire recovery record processing
// code to shell extension, which is not done now.
if (!FileBlock && hd->CmpName(SUBHEAD_TYPE_RR) && hd->SubData.Size()>0)
{
RecoveryPercent=hd->SubData[0];
RSBlockHeader Header;
GetRRInfo(this,&Header);
RecoverySize=Header.RecSectionSize*Header.RecCount;
}
#endif
if (BadCRC) // Add the file name to broken header message displayed above.
uiMsg(UIERROR_FHEADERBROKEN,Archive::FileName,hd->FileName);
}
break;
case HEAD_ENDARC:
{
*(BaseBlock *)&EndArcHead=ShortBlock;
uint ArcFlags=(uint)Raw.GetV();
EndArcHead.NextVolume=(ArcFlags & EHFL_NEXTVOLUME)!=0;
EndArcHead.StoreVolNumber=false;
EndArcHead.DataCRC=false;
EndArcHead.RevSpace=false;
}
break;
}
return Raw.Size();
}
#if !defined(RAR_NOCRYPT)
void Archive::RequestArcPassword()
{
if (!Cmd->Password.IsSet())
{
#ifdef RARDLL
if (Cmd->Callback!=NULL)
{
wchar PasswordW[MAXPASSWORD];
*PasswordW=0;
if (Cmd->Callback(UCM_NEEDPASSWORDW,Cmd->UserData,(LPARAM)PasswordW,ASIZE(PasswordW))==-1)
*PasswordW=0;
if (*PasswordW==0)
{
char PasswordA[MAXPASSWORD];
*PasswordA=0;
if (Cmd->Callback(UCM_NEEDPASSWORD,Cmd->UserData,(LPARAM)PasswordA,ASIZE(PasswordA))==-1)
*PasswordA=0;
GetWideName(PasswordA,NULL,PasswordW,ASIZE(PasswordW));
cleandata(PasswordA,sizeof(PasswordA));
}
Cmd->Password.Set(PasswordW);
cleandata(PasswordW,sizeof(PasswordW));
}
if (!Cmd->Password.IsSet())
{
Close();
Cmd->DllError=ERAR_MISSING_PASSWORD;
ErrHandler.Exit(RARX_USERBREAK);
}
#else
if (!uiGetPassword(UIPASSWORD_ARCHIVE,FileName,&Cmd->Password))
{
Close();
uiMsg(UIERROR_INCERRCOUNT); // Prevent archive deleting if delete after extraction is on.
ErrHandler.Exit(RARX_USERBREAK);
}
#endif
Cmd->ManualPassword=true;
}
}
#endif
void Archive::ProcessExtra50(RawRead *Raw,size_t ExtraSize,BaseBlock *bb)
{
// Read extra data from the end of block skipping any fields before it.
size_t ExtraStart=Raw->Size()-ExtraSize;
if (ExtraStart<Raw->GetPos())
return;
Raw->SetPos(ExtraStart);
while (Raw->DataLeft()>=2)
{
int64 FieldSize=Raw->GetV(); // Needs to be signed for check below and can be negative.
if (FieldSize<=0 || Raw->DataLeft()==0 || FieldSize>(int64)Raw->DataLeft())
break;
size_t NextPos=size_t(Raw->GetPos()+FieldSize);
uint64 FieldType=Raw->GetV();
FieldSize=int64(NextPos-Raw->GetPos()); // Field size without size and type fields.
if (FieldSize<0) // FieldType is longer than expected extra field size.
break;
if (bb->HeaderType==HEAD_MAIN)
{
MainHeader *hd=(MainHeader *)bb;
if (FieldType==MHEXTRA_LOCATOR)
{
hd->Locator=true;
uint Flags=(uint)Raw->GetV();
if ((Flags & MHEXTRA_LOCATOR_QLIST)!=0)
{
uint64 Offset=Raw->GetV();
if (Offset!=0) // 0 means that reserved space was not enough to write the offset.
hd->QOpenOffset=Offset+CurBlockPos;
}
if ((Flags & MHEXTRA_LOCATOR_RR)!=0)
{
uint64 Offset=Raw->GetV();
if (Offset!=0) // 0 means that reserved space was not enough to write the offset.
hd->RROffset=Offset+CurBlockPos;
}
}
}
if (bb->HeaderType==HEAD_FILE || bb->HeaderType==HEAD_SERVICE)
{
FileHeader *hd=(FileHeader *)bb;
switch(FieldType)
{
case FHEXTRA_CRYPT:
{
FileHeader *hd=(FileHeader *)bb;
uint EncVersion=(uint)Raw->GetV();