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); } } }