throw new SMBProtocolDecodingException("Invalid maxTransactSize: " + this.maxTransactSize + " (must be 0-16777216)");
        }
        if (this.maxReadSize < 0 || this.maxReadSize > 16777216) { // 16MB max
            throw new SMBProtocolDecodingException("Invalid maxReadSize: " + this.maxReadSize + " (must be 0-16777216)");
        }
        if (this.maxWriteSize < 0 || this.maxWriteSize > 16777216) { // 16MB max

    /**
     * Test validation of negative buffer sizes.
     */
    @Test
    public void testNegativeBufferSizes() {
        byte[] buffer = createBasicNegotiateResponseBuffer();

        // Test negative maxReadSize
        SMBUtil.writeInt4(1024 * 1024, buffer, 28); // 1MB transact - valid
        SMBUtil.writeInt4(-1, buffer, 32); // Negative read size
        SMBUtil.writeInt4(1024 * 1024, buffer, 36); // 1MB write - valid

        setPrivateField(response, "securityMode", Smb2Constants.SMB2_NEGOTIATE_SIGNING_ENABLED);
        setPrivateField(response, "capabilities", Smb2Constants.SMB2_GLOBAL_CAP_DFS);
        setPrivateField(response, "maxReadSize", 65536);
        setPrivateField(response, "maxWriteSize", 65536);
        setPrivateField(response, "maxTransactSize", 65536);

        // Setup valid request