}

func reqSignatureV4Verify(r *http.Request, region string, stype serviceType) (s3Error APIErrorCode) {
	sha256sum := getContentSha256Cksum(r, stype)
	switch {
	case isRequestSignatureV4(r):
		return doesSignatureMatch(sha256sum, r, region, stype)
	case isRequestPresignedSignatureV4(r):
		return doesPresignedSignatureMatch(sha256sum, r, region, stype)
	default:
		return ErrAccessDenied
	}
}

    public void decode(final NdrBuffer buf) throws NdrException {
        decode_header(buf);

        if (this.ptype != 12 && this.ptype != 2 && this.ptype != 3 && this.ptype != 13) {
            throw new NdrException("Unexpected ptype: " + this.ptype);
        }

        if (this.ptype == 2 || this.ptype == 3) { /* Response or Fault */
            this.alloc_hint = buf.dec_ndr_long();

        TestMessage m = new TestMessage();
        m.ptype = 0; // Request type
        NdrBuffer buf = new NdrBuffer(new byte[1024], 0);
        m.encode(buf);

        buf.setIndex(0);
        // Decode will throw exception as ptype 0 is not a valid response type
        assertThrows(NdrException.class, () -> m.decode(buf));
    }

    @Test

    // Packet Types (ptype)
    /**
     * Request packet type
     */
    int RPC_PT_REQUEST = 0x00;
    /**
     * Ping packet type
     */
    int RPC_PT_PING = 0x01;
    /**
     * Response packet type
     */
    int RPC_PT_RESPONSE = 0x02;
    /**
     * Fault packet type - indicates an error
     */
    int RPC_PT_FAULT = 0x03;
    /**

    @Override
    public void decode(final NdrBuffer buf) throws NdrException {
        decode_header(buf);

        if (ptype != 12 && ptype != 2 && ptype != 3 && ptype != 13) {
            throw new NdrException("Unexpected ptype: " + ptype);
        }

        if (ptype == 2 || ptype == 3) { /* Response or Fault */
            alloc_hint = buf.dec_ndr_long();
            buf.dec_ndr_short(); /* context id */

    class MsrpcShareInfo1 extends SmbShareInfo {

        MsrpcShareInfo1(final srvsvc.ShareInfo1 info1) {
            this.netName = info1.netname;
            this.type = info1.type;
            this.remark = info1.remark;
        }
    }

    /**
     * Creates a new request to enumerate shares on a server.
     *
     * @param server the server name to enumerate shares from
     */

    class MsrpcShareInfo1 extends SmbShareInfo {

        MsrpcShareInfo1(final srvsvc.ShareInfo1 info1) {
            this.netName = info1.netname;
            this.type = info1.type;
            this.remark = info1.remark;
        }
    }

    /**
     * Creates a new request to enumerate shares on a server.
     *
     * @param server the server name to enumerate shares from
     */

	}
}

// metricDisplay - contains info on a metric for display purposes.
type metricDisplay struct {
	Name   string   `json:"name"`
	Help   string   `json:"help"`
	Type   string   `json:"type"`
	Labels []string `json:"labels"`
}

func (md metricDisplay) String() string {
	return fmt.Sprintf("Name: %s\nType: %s\nHelp: %s\nLabels: {%s}\n", md.Name, md.Type, md.Help, strings.Join(md.Labels, ","))
}

            // Verify header encoding including ptype
            verify(mockBuffer, times(3)).enc_ndr_small(0); // minor version, ptype (REQUEST=0), and flags (all are 0)
        }

        @Test
        @DisplayName("encode should handle non-REQUEST ptype correctly")
        void testEncodeNonRequestPtype() throws NdrException {
            message.ptype = DcerpcConstants.RPC_PT_RESPONSE; // 2, not 0

                            final Map<String, String> indexObj = dataObj.get("index");
                            if (indexObj != null) {
                                if (indexObj.containsKey("_type")) {
                                    indexObj.remove("_type");
                                }
                                final String index = indexObj.get("_index");
                                if (index != null) {