private RarHeader TryReadNextHeader(Stream stream)
{
RarCrcBinaryReader reader;
if (!IsEncrypted)
{
reader = new RarCrcBinaryReader(stream);
}
else
{
if (Options.Password == null)
{
throw new CryptographicException("Encrypted Rar archive has no password specified.");
}
reader = new RarCryptoBinaryReader(stream, Options.Password);
}
var header = RarHeader.TryReadBase(reader, _isRar5, Options.ArchiveEncoding);
if (header == null)
{
return(null);
}
switch (header.HeaderCode)
{
case HeaderCodeV.RAR5_ARCHIVE_HEADER:
case HeaderCodeV.RAR4_ARCHIVE_HEADER:
{
var ah = new ArchiveHeader(header, reader);
if (ah.IsEncrypted == true)
{
//!!! rar5 we don't know yet
IsEncrypted = true;
}
return(ah);
}
case HeaderCodeV.RAR4_PROTECT_HEADER:
{
var ph = new ProtectHeader(header, reader);
// skip the recovery record data, we do not use it.
switch (StreamingMode)
{
case StreamingMode.Seekable:
{
reader.BaseStream.Position += ph.DataSize;
}
break;
case StreamingMode.Streaming:
{
reader.BaseStream.Skip(ph.DataSize);
}
break;
default:
{
throw new InvalidFormatException("Invalid StreamingMode");
}
}
return(ph);
}
case HeaderCodeV.RAR5_SERVICE_HEADER:
{
var fh = new FileHeader(header, reader, HeaderType.Service);
SkipData(fh, reader);
return(fh);
}
case HeaderCodeV.RAR4_NEW_SUB_HEADER:
{
var fh = new FileHeader(header, reader, HeaderType.NewSub);
SkipData(fh, reader);
return(fh);
}
case HeaderCodeV.RAR5_FILE_HEADER:
case HeaderCodeV.RAR4_FILE_HEADER:
{
var fh = new FileHeader(header, reader, HeaderType.File);
switch (StreamingMode)
{
case StreamingMode.Seekable:
{
fh.DataStartPosition = reader.BaseStream.Position;
reader.BaseStream.Position += fh.CompressedSize;
}
break;
case StreamingMode.Streaming:
{
var ms = new ReadOnlySubStream(reader.BaseStream, fh.CompressedSize);
if (fh.R4Salt == null)
{
fh.PackedStream = ms;
}
else
{
fh.PackedStream = new RarCryptoWrapper(ms, Options.Password, fh.R4Salt);
}
}
break;
default:
{
throw new InvalidFormatException("Invalid StreamingMode");
}
}
return(fh);
}
case HeaderCodeV.RAR5_END_ARCHIVE_HEADER:
case HeaderCodeV.RAR4_END_ARCHIVE_HEADER:
{
return(new EndArchiveHeader(header, reader));
}
case HeaderCodeV.RAR5_ARCHIVE_ENCRYPTION_HEADER:
{
var ch = new ArchiveCryptHeader(header, reader);
IsEncrypted = true;
return(ch);
}
default:
{
throw new InvalidFormatException("Unknown Rar Header: " + header.HeaderCode);
}
}
}
private RarHeader TryReadNextHeader(Stream stream)
{
RarCrcBinaryReader reader;
if (!IsEncrypted)
{
reader = new RarCrcBinaryReader(stream);
}
else
{
#if !NO_CRYPTO
if (Options.Password == null)
{
throw new CryptographicException("Encrypted Rar archive has no password specified.");
}
reader = new RarCryptoBinaryReader(stream, Options.Password);
#else
throw new CryptographicException("Rar encryption unsupported on this platform");
#endif
}
var header = RarHeader.TryReadBase(reader, this.isRar5, Options.ArchiveEncoding);
if (header == null)
{
return(null);
}
switch (header.HeaderCode)
{
case HeaderCodeV.Rar5ArchiveHeader:
case HeaderCodeV.Rar4ArchiveHeader:
{
var ah = new ArchiveHeader(header, reader);
if (ah.IsEncrypted == true)
{
//!!! rar5 we don't know yet
IsEncrypted = true;
}
return(ah);
}
case HeaderCodeV.Rar4ProtectHeader:
{
var ph = new ProtectHeader(header, reader);
// skip the recovery record data, we do not use it.
switch (StreamingMode)
{
case StreamingMode.Seekable:
{
reader.BaseStream.Position += ph.DataSize;
}
break;
case StreamingMode.Streaming:
{
reader.BaseStream.Skip(ph.DataSize);
}
break;
default:
{
throw new InvalidFormatException("Invalid StreamingMode");
}
}
return(ph);
}
case HeaderCodeV.Rar5ServiceHeader:
{
var fh = new FileHeader(header, reader, HeaderType.Service);
SkipData(fh, reader);
return(fh);
}
case HeaderCodeV.Rar4NewSubHeader:
{
var fh = new FileHeader(header, reader, HeaderType.NewSub);
SkipData(fh, reader);
return(fh);
}
case HeaderCodeV.Rar5FileHeader:
case HeaderCodeV.Rar4FileHeader:
{
var fh = new FileHeader(header, reader, HeaderType.File);
switch (StreamingMode)
{
case StreamingMode.Seekable:
{
fh.DataStartPosition = reader.BaseStream.Position;
reader.BaseStream.Position += fh.CompressedSize;
}
break;
case StreamingMode.Streaming:
{
var ms = new ReadOnlySubStream(reader.BaseStream, fh.CompressedSize);
if (fh.R4Salt == null)
{
fh.PackedStream = ms;
}
else
{
#if !NO_CRYPTO
fh.PackedStream = new RarCryptoWrapper(ms, Options.Password, fh.R4Salt);
#else
throw new NotSupportedException("RarCrypto not supported");
#endif
}
}
break;
default:
{
throw new InvalidFormatException("Invalid StreamingMode");
}
}
return(fh);
}
case HeaderCodeV.Rar5EndArchiveHeader:
case HeaderCodeV.Rar4EndArchiveHeader:
{
return(new EndArchiveHeader(header, reader));
}
case HeaderCodeV.Rar5ArchiveEncryptionHeader:
{
var ch = new ArchiveCryptHeader(header, reader);
IsEncrypted = true;
return(ch);
}
default:
{
throw new InvalidFormatException("Unknown Rar Header: " + header.HeaderCode);
}
}
}
