private void ReadLocator(MarkingBinaryReader reader)
{
var size = reader.ReadRarVIntUInt16();
var type = reader.ReadRarVIntUInt16();
if (type != 1)
{
throw new InvalidFormatException("expected locator record");
}
var flags = reader.ReadRarVIntUInt16();
const ushort hasQuickOpenOffset = 0x01;
const ushort hasRecoveryOffset = 0x02;
ulong quickOpenOffset = 0;
if ((flags & hasQuickOpenOffset) == hasQuickOpenOffset)
{
quickOpenOffset = reader.ReadRarVInt();
}
ulong recoveryOffset = 0;
if ((flags & hasRecoveryOffset) == hasRecoveryOffset)
{
recoveryOffset = reader.ReadRarVInt();
}
}
protected override void ReadFinish(MarkingBinaryReader reader)
{
if (IsRar5)
{
Flags = reader.ReadRarVIntUInt16();
if (HasFlag(ArchiveFlagsV5.HAS_VOLUME_NUMBER))
{
VolumeNumber = (int)reader.ReadRarVIntUInt32();
}
// later: we may have a locator record if we need it
//if (ExtraSize != 0) {
// ReadLocator(reader);
//}
}
else
{
Flags = HeaderFlags;
HighPosAv = reader.ReadInt16();
PosAv = reader.ReadInt32();
if (HasFlag(ArchiveFlagsV4.ENCRYPT_VER))
{
EncryptionVersion = reader.ReadByte();
}
}
}
protected override void ReadFinish(MarkingBinaryReader reader)
{
if (IsRar5)
{
Flags = reader.ReadRarVIntUInt16();
}
else
{
Flags = HeaderFlags;
if (HasFlag(EndArchiveFlagsV4.DATA_CRC))
{
ArchiveCrc = reader.ReadInt32();
}
if (HasFlag(EndArchiveFlagsV4.VOLUME_NUMBER))
{
VolumeNumber = reader.ReadInt16();
}
}
}
private void ReadFromReaderV5(MarkingBinaryReader reader)
{
Flags = reader.ReadRarVIntUInt16();
var lvalue = checked ((long)reader.ReadRarVInt());
// long.MaxValue causes the unpack code to finish when the input stream is exhausted
UncompressedSize = HasFlag(FileFlagsV5.UNPACKED_SIZE_UNKNOWN) ? long.MaxValue : lvalue;
FileAttributes = reader.ReadRarVIntUInt32();
if (HasFlag(FileFlagsV5.HAS_MOD_TIME))
{
FileLastModifiedTime = Utility.UnixTimeToDateTime(reader.ReadUInt32());
}
if (HasFlag(FileFlagsV5.HAS_CRC32))
{
FileCrc = reader.ReadUInt32();
}
var compressionInfo = reader.ReadRarVIntUInt16();
// Lower 6 bits (0x003f mask) contain the version of compression algorithm, resulting in possible 0 - 63 values. Current version is 0.
// "+ 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.
CompressionAlgorithm = (byte)((compressionInfo & 0x3f) + 50);
// 7th bit (0x0040) defines the solid flag. If it is set, RAR continues to use the compression dictionary left after processing preceding files.
// It can be set only for file headers and is never set for service headers.
IsSolid = (compressionInfo & 0x40) == 0x40;
// Bits 8 - 10 (0x0380 mask) define the compression method. Currently only values 0 - 5 are used. 0 means no compression.
CompressionMethod = (byte)((compressionInfo >> 7) & 0x7);
// Bits 11 - 14 (0x3c00) define the minimum size of dictionary size required to extract data. Value 0 means 128 KB, 1 - 256 KB, ..., 14 - 2048 MB, 15 - 4096 MB.
WindowSize = IsDirectory ? 0 : ((size_t)0x20000) << ((compressionInfo >> 10) & 0xf);
HostOs = reader.ReadRarVIntByte();
var nameSize = reader.ReadRarVIntUInt16();
// Variable length field containing Name length bytes in UTF-8 format without trailing zero.
// For file header this is a name of archived file. Forward slash character is used as the path separator both for Unix and Windows names.
// Backslashes are treated as a part of name for Unix names and as invalid character for Windows file names. Type of name is defined by Host OS field.
//
// TODO: not sure if anything needs to be done to handle the following:
// If Unix file name contains any high ASCII characters which cannot be correctly converted to Unicode and UTF-8
// we map such characters to to 0xE080 - 0xE0FF private use Unicode area and insert 0xFFFE Unicode non-character
// to resulting string to indicate that it contains mapped characters, which need to be converted back when extracting.
// Concrete position of 0xFFFE is not defined, we need to search the entire string for it. Such mapped names are not
// portable and can be correctly unpacked only on the same system where they were created.
//
// For service header this field contains a name of service header. Now the following names are used:
// CMT Archive comment
// QO Archive quick open data
// ACL NTFS file permissions
// STM NTFS alternate data stream
// RR Recovery record
var b = reader.ReadBytes(nameSize);
FileName = ConvertPathV5(Encoding.UTF8.GetString(b, 0, b.Length));
// extra size seems to be redudant since we know the total header size
if (ExtraSize != RemainingHeaderBytes(reader))
{
throw new InvalidFormatException("rar5 header size / extra size inconsistency");
}
isEncryptedRar5 = false;
while (RemainingHeaderBytes(reader) > 0)
{
var size = reader.ReadRarVIntUInt16();
int n = RemainingHeaderBytes(reader);
var type = reader.ReadRarVIntUInt16();
switch (type)
{
//TODO
case 1: // file encryption
{
isEncryptedRar5 = true;
//var version = reader.ReadRarVIntByte();
//if (version != 0) throw new InvalidFormatException("unknown encryption algorithm " + version);
}
break;
// case 2: // file hash
// {
//
// }
// break;
case 3: // file time
{
ushort flags = reader.ReadRarVIntUInt16();
var isWindowsTime = (flags & 1) == 0;
if ((flags & 0x2) == 0x2)
{
FileLastModifiedTime = ReadExtendedTimeV5(reader, isWindowsTime);
}
if ((flags & 0x4) == 0x4)
{
FileCreatedTime = ReadExtendedTimeV5(reader, isWindowsTime);
}
if ((flags & 0x8) == 0x8)
{
FileLastAccessedTime = ReadExtendedTimeV5(reader, isWindowsTime);
}
}
break;
//TODO
// case 4: // file version
// {
//
// }
// break;
// case 5: // file system redirection
// {
//
// }
// break;
// case 6: // unix owner
// {
//
// }
// break;
// case 7: // service data
// {
//
// }
// break;
default:
// skip unknown record types to allow new record types to be added in the future
break;
}
// drain any trailing bytes of extra record
int did = n - RemainingHeaderBytes(reader);
int drain = size - did;
if (drain > 0)
{
reader.ReadBytes(drain);
}
}
if (AdditionalDataSize != 0)
{
CompressedSize = AdditionalDataSize;
}
}