if (provider != null) {
            return provider;
        }
        provider = new BouncyCastleProvider();
        return provider;
    }

    /**
     * Initialize Provider Instance with customProvider
     * @param customProvider
     * @throws Exception if Provider has already been initialized.
     */
    public static void initProvider(Provider customProvider) throws CIFSUnsupportedCryptoException {

            ASN1TaggedObject constructed = (ASN1TaggedObject) is.readObject();
            if ( constructed == null || constructed.getTagClass() != BERTags.APPLICATION ||
                    !(constructed.getBaseObject() instanceof  ASN1Sequence) )
                throw new IOException("Malformed SPNEGO token " + constructed);

            ASN1Sequence vec = (ASN1Sequence) constructed.getBaseObject();

            CacheEntry<Map<String, CacheEntry<DfsReferralDataInternal>>> entry = new CacheEntry<>(tf.getConfig().getDfsTtl() * 10L);
            this._domains = entry;
            if ( tf.getConfig().isDfsStrictView() && ioe instanceof SmbAuthException ) {
                throw (SmbAuthException) ioe;
            }
            return this._domains.map;
        }
        return null;
    }


    /**
     * 

            }
        } else if (tree.inDomainDfs &&
                        !(request instanceof NtTransQuerySecurityDesc) &&
                        !(request instanceof SmbComClose) &&
                        !(request instanceof SmbComFindClose2)) {
            throw new SmbException(NtStatus.NT_STATUS_NOT_FOUND, false);
        } else {
            if (request != null)

                    tree.send(create2);
                }
                catch ( Exception e ) {
                    // timeout is expected for now as we do not ack the break
                    if ( ! ( e.getCause() instanceof RequestTimeoutException ) ) {
                        throw e;
                    }
                }
            }
            else if ( trans.hasCapability(SmbConstants.CAP_NT_SMBS) ) {

    }


    /**
     * {@inheritDoc}
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals ( Object obj ) {
        if ( ! ( obj instanceof DfsReferralData ) ) {
            return false;
        }
        DfsReferralData other = (DfsReferralData) obj;

     * @param f2
     * @throws CIFSException
     */
    private static void connectionMatches ( SmbResource f1, SmbResource f2 ) throws CIFSException {
        Assert.assertTrue(f1 instanceof SmbFile);
        Assert.assertTrue(f2 instanceof SmbFile);
        try ( SmbTreeHandleInternal th1 = (SmbTreeHandleInternal) ( (SmbFile) f1 ).getTreeHandle();

            ASN1TaggedObject mechToken = ASN1Util.as(ASN1TaggedObject.class, stream.readObject());
            if ( mechToken == null || mechToken.getTagClass() != BERTags.APPLICATION ||
                    !(mechToken.getBaseObject() instanceof ASN1Sequence) )
                throw new PACDecodingException("Malformed kerberos token");

            this.apRequest = new KerberosApRequest((ASN1Sequence) mechToken.getBaseObject(), keys);
        }

        this.andxOffset = dstIndex - this.headerStart;
        SMBUtil.writeInt2(this.andxOffset, dst, start + ANDX_OFFSET_OFFSET);

        this.andx.setUseUnicode(this.isUseUnicode());
        if ( this.andx instanceof AndXServerMessageBlock ) {

            /*
             * A word about communicating header info to andx smbs
             *
             * This is where we recursively invoke the provided andx smb

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.codelibs</groupId>
	<artifactId>jcifs</artifactId>
	<version>2.1.38-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>jCIFS</name>
	<url>https://github.com/codelibs/jcifs</url>