public static bool TryRead(BinaryReader reader, int version, out QarArchiveEntryHeader header)
{
header = new QarArchiveEntryHeader();
// hash 8 bytes
uint hashLow = reader.ReadUInt32() ^ xorMask1;
uint hashHigh = reader.ReadUInt32() ^ xorMask1;
header.Hash = (ulong)hashHigh << 32 | hashLow;
// size 8 bytes (4+4), compressed and not, the order depends on the version
header.Size1 = reader.ReadUInt32() ^ xorMask2;
header.Size2 = reader.ReadUInt32() ^ xorMask3;
// data hash 16 bytes
uint md51 = reader.ReadUInt32() ^ xorMask4;
uint md52 = reader.ReadUInt32() ^ xorMask1;
uint md53 = reader.ReadUInt32() ^ xorMask1;
uint md54 = reader.ReadUInt32() ^ xorMask2;
byte[] md5Hash = new byte[16];
Buffer.BlockCopy(BitConverter.GetBytes(md51), 0, md5Hash, 0, sizeof(uint));
Buffer.BlockCopy(BitConverter.GetBytes(md52), 0, md5Hash, 4, sizeof(uint));
Buffer.BlockCopy(BitConverter.GetBytes(md53), 0, md5Hash, 8, sizeof(uint));
Buffer.BlockCopy(BitConverter.GetBytes(md54), 0, md5Hash, 12, sizeof(uint));
header.DataHash = md5Hash;
// some file have a special signature if they are crypted
// here we attempt to read the file signature
QarArchiveEntryContentHeader.TryRead(reader, version, header.Hash, header.Seed, out header.Content);
return(true);
}
// header is 32 bytes
void ReadHeader()
{
// we cant read if the archive has been closed.
_archive.ThrowIfDisposed();
using (var stream = _archive.Open(Offset))
using (var reader = new BinaryReader(stream))
{
if (!QarArchiveEntryHeader.TryRead(reader, _archive.Version, out header))
{
throw new InvalidDataException("The contents of the stream are not in the qar archive format.");
}
}
}