package once

// Singleton contains a pointer to T that must be set once.
// Until the value is set all Get() calls will block.
type Singleton[T any] struct {
	v   *T
	set chan struct{}
}

// NewSingleton creates a new unset singleton.
func NewSingleton[T any]() *Singleton[T] {
	return &Singleton[T]{set: make(chan struct{}), v: nil}
}

// Get will return the singleton value.
func (s *Singleton[T]) Get() *T {
	<-s.set
	return s.v

     * Flag for resource groups in logon information.
     */
    int LOGON_RESOURCE_GROUPS = 0x200;

    /**
     * Kerberos salt type for MD5 checksums.
     */
    int MD5_KRB_SALT = 17;
    /**
     * MD5 block length in bytes.
     */
    int MD5_BLOCK_LENGTH = 64;

 * These constants represent standard Windows error codes returned by SMB servers.
 */
public interface WinError {

    /*
     * Don't bother to edit this. Everything within the interface
     * block is automatically generated from the ntstatus package.
     */

    /** The operation completed successfully */
    int ERROR_SUCCESS = 0;
    /** Access is denied */
    int ERROR_ACCESS_DENIED = 5;

 * These constants represent standard Windows error codes returned by SMB servers.
 */
public interface WinError {

    /* Don't bother to edit this. Everthing within the interface
     * block is automatically generated from the ntstatus package.
     */

    /** The operation completed successfully */
    int ERROR_SUCCESS = 0;
    /** Access is denied */
    int ERROR_ACCESS_DENIED = 5;

/*
 * Copyright (c) 2022 Block, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"os"
	"syscall"
)

var (
	// Disallow updating access times
	// Add non-block to avoid syscall to attempt to set epoll on files.
	readMode = os.O_RDONLY | 0x40000 | syscall.O_NONBLOCK // O_NOATIME

	// Write with data sync only used only for `xl.meta` writes

/*
 * Copyright (C) 2023 Block, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

    void testDES() throws Exception {
        // Given
        byte[] key = "testkey1".getBytes(); // 8 bytes for DES
        byte[] plaintext = "12345678".getBytes(); // 8 bytes (DES block size)

        // When
        Cipher desCipher = Crypto.getDES(key);
        desCipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "DES"));
        byte[] encrypted = desCipher.doFinal(plaintext);

		if err != nil {
			if !xnet.IsNetworkOrHostDown(err, true) {
				gridLogIfNot(ctx, fmt.Errorf("ws read: %w", err), net.ErrClosed, io.EOF)
			}
			return
		}
		block := c.blockMessages.Load()
		if block != nil && *block != nil {
			<-*block
		}

		if c.incomingBytes != nil {
			c.incomingBytes(int64(len(msg)))
		}

		// Parse the received message
		var m message

	DataBlocks int `json:"data"`
	// ParityBlocks is the number of parity blocks for erasure-coding
	ParityBlocks int `json:"parity"`
	// BlockSize is the size of one erasure-coded block
	BlockSize int64 `json:"blockSize"`
	// Index is the index of the current disk
	Index int `json:"index"`
	// Distribution is the distribution of the data and parity blocks
	Distribution []int `json:"distribution"`