private Stream CheckSFX(Stream stream)
{
RewindableStream rewindableStream = GetRewindableStream(stream);
stream = rewindableStream;
BinaryReader reader = new BinaryReader(rewindableStream);
try
{
int count = 0;
while (true)
{
byte firstByte = reader.ReadByte();
if (firstByte == 0x52)
{
MemoryStream buffer = new MemoryStream();
byte[] nextThreeBytes = reader.ReadBytes(3);
if ((nextThreeBytes[0] == 0x45) &&
(nextThreeBytes[1] == 0x7E) &&
(nextThreeBytes[2] == 0x5E))
{
//old format and isvalid
buffer.WriteByte(0x52);
buffer.Write(nextThreeBytes, 0, 3);
rewindableStream.Rewind(buffer);
break;
}
byte[] secondThreeBytes = reader.ReadBytes(3);
if ((nextThreeBytes[0] == 0x61) &&
(nextThreeBytes[1] == 0x72) &&
(nextThreeBytes[2] == 0x21) &&
(secondThreeBytes[0] == 0x1A) &&
(secondThreeBytes[1] == 0x07) &&
(secondThreeBytes[2] == 0x00))
{
//new format and isvalid
buffer.WriteByte(0x52);
buffer.Write(nextThreeBytes, 0, 3);
buffer.Write(secondThreeBytes, 0, 3);
rewindableStream.Rewind(buffer);
break;
}
buffer.Write(nextThreeBytes, 0, 3);
buffer.Write(secondThreeBytes, 0, 3);
rewindableStream.Rewind(buffer);
}
if (count > MAX_SFX_SIZE)
{
break;
}
}
}
catch (Exception e)
{
if (!FlagUtility.HasFlag(Options, Options.KeepStreamsOpen))
{
#if NET2 || UNITY
reader.Close();
#else
reader.Dispose();
#endif
}
throw new InvalidFormatException("Error trying to read rar signature.", e);
}
return(stream);
}
protected override void ReadFromReader(MarkingBinaryReader reader)
{
uint lowUncompressedSize = reader.ReadUInt32();
HostOS = (HostOS)reader.ReadByte();
FileCRC = reader.ReadUInt32();
FileLastModifiedTime = Utility.DosDateToDateTime(reader.ReadInt32());
RarVersion = reader.ReadByte();
PackingMethod = reader.ReadByte();
short nameSize = reader.ReadInt16();
FileAttributes = reader.ReadInt32();
uint highCompressedSize = 0;
uint highUncompressedkSize = 0;
if (FlagUtility.HasFlag(FileFlags, FileFlags.LARGE))
{
highCompressedSize = reader.ReadUInt32();
highUncompressedkSize = reader.ReadUInt32();
}
else
{
if (lowUncompressedSize == 0xffffffff)
{
lowUncompressedSize = 0xffffffff;
highUncompressedkSize = int.MaxValue;
}
}
CompressedSize = UInt32To64(highCompressedSize, AdditionalSize);
UncompressedSize = UInt32To64(highUncompressedkSize, lowUncompressedSize);
nameSize = nameSize > 4 * 1024 ? (short)(4 * 1024) : nameSize;
byte[] fileNameBytes = reader.ReadBytes(nameSize);
switch (HeaderType)
{
case HeaderType.FileHeader:
{
if (FlagUtility.HasFlag(FileFlags, FileFlags.UNICODE))
{
int length = 0;
while (length < fileNameBytes.Length &&
fileNameBytes[length] != 0)
{
length++;
}
if (length != nameSize)
{
length++;
FileName = FileNameDecoder.Decode(fileNameBytes, length);
}
else
{
FileName = DecodeDefault(fileNameBytes);
}
}
else
{
FileName = DecodeDefault(fileNameBytes);
}
FileName = ConvertPath(FileName, HostOS);
}
break;
case HeaderType.NewSubHeader:
{
int datasize = HeaderSize - NEWLHD_SIZE - nameSize;
if (FlagUtility.HasFlag(FileFlags, FileFlags.SALT))
{
datasize -= SALT_SIZE;
}
if (datasize > 0)
{
SubData = reader.ReadBytes(datasize);
}
if (NewSubHeaderType.SUBHEAD_TYPE_RR.Equals(fileNameBytes))
{
RecoverySectors = SubData[8] + (SubData[9] << 8)
+ (SubData[10] << 16) + (SubData[11] << 24);
}
}
break;
}
if (FlagUtility.HasFlag(FileFlags, FileFlags.SALT))
{
Salt = reader.ReadBytes(SALT_SIZE);
}
if (FlagUtility.HasFlag(FileFlags, FileFlags.EXTTIME))
{
// verify that the end of the header hasn't been reached before reading the Extended Time.
// some tools incorrectly omit Extended Time despite specifying FileFlags.EXTTIME, which most parsers tolerate.
if (ReadBytes + reader.CurrentReadByteCount <= HeaderSize - 2)
{
ushort extendedFlags = reader.ReadUInt16();
FileLastModifiedTime = ProcessExtendedTime(extendedFlags, FileLastModifiedTime, reader, 0);
FileCreatedTime = ProcessExtendedTime(extendedFlags, null, reader, 1);
FileLastAccessedTime = ProcessExtendedTime(extendedFlags, null, reader, 2);
FileArchivedTime = ProcessExtendedTime(extendedFlags, null, reader, 3);
}
}
}