public const int ItemSize = (1 + 8 + 4 + 4) + 1; // 1 more than length of fields
internal MultiStreamItemHeader(QQnBinaryReader reader)
{
byte version = reader.ReadByte();
if (version == 1)
{
_offset = reader.ReadInt64();
_length = reader.ReadUInt32(); // As uint
_itemType = reader.ReadInt32();
}
else if (version == 2)
{
// Define some format which allows +4GB substream
// When this is used we will need some more padding space; but it probably will never be written anyway
// At least we can read them with this version
_offset = reader.ReadInt64();
_length = reader.ReadInt64(); // As long
_itemType = reader.ReadInt32();
}
else
{
throw new InvalidOperationException();
}
}
/*public AssuredStreamHeader(Stream source)
* : this(source, VerificationMode.Full)
* {
* }*/
public AssuredStreamHeader(Stream source, VerificationMode mode)
{
QQnBinaryReader br = new QQnBinaryReader(source);
uint vFileSignature = br.ReadUInt32();
if (vFileSignature != FileSignature)
{
throw new FormatException();
}
_fileType = br.ReadString();
_hashType = (HashType)br.ReadByte();
_fileHash = br.ReadByteArray();
_hashSignature = br.ReadByteArray();
byte[] publicKey = br.ReadByteArray();
if (publicKey.Length > 0)
{
_snk = StrongNameKey.LoadFrom(publicKey);
if (mode != VerificationMode.None)
{
if (!_snk.VerifyHash(_fileHash, _hashSignature))
{
throw new CryptographicException("Stream hash verification failed");
}
}
}
_guid = new Guid(br.ReadBytes(16));
_bodyLength = br.ReadInt64();
_hashPosition = source.Position;
}