public XlsBiffStream(Stream baseStream, int offset = 0, int explicitVersion = 0, string password = null, byte[] secretKey = null, EncryptionInfo encryption = null)
{
BaseStream = baseStream;
Position = offset;
var bof = Read() as XlsBiffBOF;
if (bof != null)
{
BiffVersion = explicitVersion == 0 ? GetBiffVersion(bof) : explicitVersion;
BiffType = bof.Type;
}
CipherBlock = -1;
if (secretKey != null)
{
SecretKey = secretKey;
Encryption = encryption;
Cipher = Encryption.CreateCipher();
}
else
{
var filePass = Read() as XlsBiffFilePass;
if (filePass == null)
{
filePass = Read() as XlsBiffFilePass;
}
if (filePass != null)
{
Encryption = filePass.EncryptionInfo;
if (Encryption.VerifyPassword("VelvetSweatshop"))
{
// Magic password used for write-protected workbooks
password = "******";
}
else if (!Encryption.VerifyPassword(password))
{
throw new InvalidPasswordException(Errors.ErrorInvalidPassword);
}
SecretKey = Encryption.GenerateSecretKey(password);
Cipher = Encryption.CreateCipher();
}
}
Position = offset;
}
