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vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Descrizione"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Descrizione</span> </div> </a> <button aria-controls="toc-Descrizione-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Attiva/disattiva la sottosezione Descrizione</span> </button> <ul id="toc-Descrizione-sublist" class="vector-toc-list"> <li id="toc-Classificazione" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Classificazione"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Classificazione</span> </div> </a> <ul id="toc-Classificazione-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Esempi" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Esempi"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Esempi</span> </div> </a> <ul id="toc-Esempi-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Funzioni_per_la_conversione" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Funzioni_per_la_conversione"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Funzioni per la conversione</span> </div> </a> <button aria-controls="toc-Funzioni_per_la_conversione-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Attiva/disattiva la sottosezione Funzioni per la conversione</span> </button> <ul id="toc-Funzioni_per_la_conversione-sublist" class="vector-toc-list"> <li id="toc-Implementazione_in_C" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Implementazione_in_C"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Implementazione in C</span> </div> </a> <ul id="toc-Implementazione_in_C-sublist" class="vector-toc-list"> <li id="toc-Conversione_di_word" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Conversione_di_word"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.1</span> <span>Conversione di word</span> </div> </a> <ul id="toc-Conversione_di_word-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Conversione_di_double_word" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Conversione_di_double_word"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.2</span> <span>Conversione di double word</span> </div> </a> <ul id="toc-Conversione_di_double_word-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Implementazione_in_C#" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Implementazione_in_C#"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Implementazione in C#</span> </div> </a> <ul id="toc-Implementazione_in_C#-sublist" class="vector-toc-list"> <li id="toc-UInt32" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#UInt32"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.1</span> <span>UInt32</span> </div> </a> <ul id="toc-UInt32-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-UInt64" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#UInt64"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.2</span> <span>UInt64</span> </div> </a> <ul id="toc-UInt64-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Implementazione_in_C++" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Implementazione_in_C++"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Implementazione in C++</span> </div> </a> <ul id="toc-Implementazione_in_C++-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Uso_per_i_formati_di_data" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Uso_per_i_formati_di_data"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Uso per i formati di data</span> </div> </a> <ul id="toc-Uso_per_i_formati_di_data-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Altri progetti</span> </div> </a> <ul id="toc-Altri_progetti-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indice" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostra/Nascondi l'indice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ordine dei byte</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vai a una voce in un'altra lingua. Disponibile in 30 lingue" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-30" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">30 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D8%B1%D8%AA%D9%8A%D8%A8_%D8%A7%D9%84%D8%A8%D8%A7%D9%8A%D8%AA%D8%A7%D8%AA" title="ترتيب البايتات - arabo" lang="ar" hreflang="ar" data-title="ترتيب البايتات" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/K%C3%BCtuclular_%C3%BCsulu" title="Kütuclular üsulu - azerbaigiano" lang="az" hreflang="az" data-title="Kütuclular üsulu" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaigiano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Ordre_dels_bytes" title="Ordre dels bytes - catalano" lang="ca" hreflang="ca" data-title="Ordre dels bytes" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Endianita" title="Endianita - ceco" lang="cs" hreflang="cs" data-title="Endianita" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Byte-Reihenfolge" title="Byte-Reihenfolge - tedesco" lang="de" hreflang="de" data-title="Byte-Reihenfolge" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/Endianness" title="Endianness - greco" lang="el" hreflang="el" data-title="Endianness" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Endianness" title="Endianness - inglese" lang="en" hreflang="en" data-title="Endianness" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Bajta_vic-ordo" title="Bajta vic-ordo - esperanto" lang="eo" hreflang="eo" data-title="Bajta vic-ordo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Endianness" title="Endianness - spagnolo" lang="es" hreflang="es" data-title="Endianness" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%86%D8%AF%DB%8C%D8%A7%D9%86" title="اندیان - persiano" lang="fa" hreflang="fa" data-title="اندیان" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Tavuj%C3%A4rjestys" title="Tavujärjestys - finlandese" lang="fi" hreflang="fi" data-title="Tavujärjestys" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Boutisme" title="Boutisme - francese" lang="fr" hreflang="fr" data-title="Boutisme" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A1%D7%93%D7%A8_%D7%91%D7%AA%D7%99%D7%9D" title="סדר בתים - ebraico" lang="he" hreflang="he" data-title="סדר בתים" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/B%C3%A1jtsorrend" title="Bájtsorrend - ungherese" lang="hu" hreflang="hu" data-title="Bájtsorrend" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Endian" title="Endian - indonesiano" lang="id" hreflang="id" data-title="Endian" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%A8%E3%83%B3%E3%83%87%E3%82%A3%E3%82%A2%E3%83%B3" title="エンディアン - giapponese" lang="ja" hreflang="ja" data-title="エンディアン" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%97%94%EB%94%94%EC%96%B8" title="엔디언 - coreano" lang="ko" hreflang="ko" data-title="엔디언" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Endianness" title="Endianness - latino" lang="la" hreflang="la" data-title="Endianness" data-language-autonym="Latina" data-language-local-name="latino" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Bait%C5%B3_seka_%C5%BEodyje" title="Baitų seka žodyje - lituano" lang="lt" hreflang="lt" data-title="Baitų seka žodyje" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Endianness" title="Endianness - olandese" lang="nl" hreflang="nl" data-title="Endianness" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Endian" title="Endian - norvegese bokmål" lang="nb" hreflang="nb" data-title="Endian" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Kolejno%C5%9B%C4%87_bajt%C3%B3w" title="Kolejność bajtów - polacco" lang="pl" hreflang="pl" data-title="Kolejność bajtów" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Extremidade_(ordena%C3%A7%C3%A3o)" title="Extremidade (ordenação) - portoghese" lang="pt" hreflang="pt" data-title="Extremidade (ordenação)" data-language-autonym="Português" data-language-local-name="portoghese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BE%D1%80%D1%8F%D0%B4%D0%BE%D0%BA_%D0%B1%D0%B0%D0%B9%D1%82%D0%BE%D0%B2" title="Порядок байтов - russo" lang="ru" hreflang="ru" data-title="Порядок байтов" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Endianness" title="Endianness - Simple English" lang="en-simple" hreflang="en-simple" data-title="Endianness" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Endianita" title="Endianita - slovacco" lang="sk" hreflang="sk" data-title="Endianita" data-language-autonym="Slovenčina" data-language-local-name="slovacco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Endian" title="Endian - svedese" lang="sv" hreflang="sv" data-title="Endian" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Endian" title="Endian - turco" lang="tr" hreflang="tr" data-title="Endian" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%BE%D1%80%D1%8F%D0%B4%D0%BE%D0%BA_%D0%B1%D0%B0%D0%B9%D1%82%D1%96%D0%B2" title="Порядок байтів - ucraino" lang="uk" hreflang="uk" data-title="Порядок байтів" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%AD%97%E8%8A%82%E5%BA%8F" title="字节序 - cinese" lang="zh" hreflang="zh" data-title="字节序" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q339338#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> 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aggiungendo citazioni da <a href="/wiki/Wikipedia:Fonti_attendibili" title="Wikipedia:Fonti attendibili">fonti attendibili</a> secondo le <a href="/wiki/Wikipedia:Uso_delle_fonti" title="Wikipedia:Uso delle fonti">linee guida sull'uso delle fonti</a>. Segui i suggerimenti del <a href="/wiki/Progetto:Informatica" title="Progetto:Informatica">progetto di riferimento</a>.</div> </div> </div> </div> </div> <p>L'<b>ordine dei byte</b> (conosciuto anche come <b>big-endian</b>, <b>little-endian</b> o <b>middle-endian</b> a seconda dei metodi differenti), in <a href="/wiki/Informatica" title="Informatica">informatica</a>, indica modalità differenti usate dai <a href="/wiki/Computer" title="Computer">calcolatori</a> per immagazzinare in <a href="/wiki/Memoria_(informatica)" title="Memoria (informatica)">memoria</a> <a href="/wiki/Dato" title="Dato">dati</a> di dimensione superiore al <a href="/wiki/Byte" title="Byte">byte</a> (es. <a href="/wiki/Word" class="mw-redirect" title="Word">word</a>, <a href="/wiki/Dword" title="Dword">dword</a>, <a href="/wiki/Qword" title="Qword">qword</a>). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Storia">Storia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=1" title="Modifica la sezione Storia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=1" title="Edit section's source code: Storia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La <i>endianness</i> (ordine dei byte) di un computer dipende essenzialmente dall'architettura hardware usata. Ad esempio, <a href="/wiki/Intel" title="Intel">Intel</a> e <a href="/wiki/Digital" class="mw-redirect" title="Digital">Digital</a> usano il formato little-endian mentre <a href="/wiki/Motorola" title="Motorola">Motorola</a>, <a href="/wiki/IBM" title="IBM">IBM</a> e <a href="/wiki/Sun_Microsystems" title="Sun Microsystems">Sun</a> usano il formato big-endian. Il formato dei dati contenuti nelle intestazioni dei <a href="/wiki/Protocollo_di_rete" title="Protocollo di rete">protocolli di rete</a> è anch'esso big-endian; altri esempi di uso di questi due diversi formati sono quello del bus <a href="/wiki/Peripheral_Component_Interconnect" title="Peripheral Component Interconnect">PCI</a>, che è little-endian, o quello del <a href="/wiki/VMEbus" title="VMEbus">bus VME</a> che è big-endian. </p> <div class="mw-heading mw-heading2"><h2 id="Etimologia">Etimologia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=2" title="Modifica la sezione Etimologia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=2" title="Edit section's source code: Etimologia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I termini big-endian e little-endian derivano dai nomi di due popolazioni che abitavano nelle favolose isole di <a href="/wiki/Lilliput" title="Lilliput">Lilliput</a> e <a href="/wiki/Lilliput" title="Lilliput">Blefuscu</a> nel romanzo <i><a href="/wiki/I_viaggi_di_Gulliver" title="I viaggi di Gulliver">I viaggi di Gulliver</a></i> di <a href="/wiki/Jonathan_Swift" title="Jonathan Swift">Jonathan Swift</a>. Queste erano entrate in rivalità per il modo in cui aprivano le uova - rompendo la punta o il fondo: a Lilliput, per editto dell'imperatore il cui figlio una volta si tagliò aprendo un uovo dall'estremità più grande, fu ordinato di aprire le uova dall'estremità più piccola (little endians); a Blefuscu si rifugiarono gli oppositori che volevano conservare la tradizione di rompere le uova dall'estremità più grande (big endians). A causa di questa differenza e della sua legittimazione imperiale era scoppiata tra le due isole una guerra sanguinosa. </p> <div class="mw-heading mw-heading2"><h2 id="Descrizione">Descrizione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=3" title="Modifica la sezione Descrizione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=3" title="Edit section's source code: Descrizione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Questa differenziazione non riguarda né la posizione dei <a href="/wiki/Bit_(informatica)" class="mw-redirect" title="Bit (informatica)">bit</a> all'interno del byte, nel qual caso si parla di <a href="/wiki/Ordine_dei_bit" title="Ordine dei bit">ordine dei bit</a>, né le posizioni dei caratteri in una <a href="/wiki/Stringa_(informatica)" title="Stringa (informatica)">stringa</a>. Ha invece importanza nell'interpretazione (decodifica) di stringhe multi-byte di caratteri, ad esempio la codifica <a href="/wiki/UTF-16" title="UTF-16">UTF-16</a> dello standard <a href="/wiki/Unicode" title="Unicode">unicode</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Classificazione">Classificazione</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=4" title="Modifica la sezione Classificazione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=4" title="Edit section's source code: Classificazione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:32bit-Endianess.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/32bit-Endianess.svg/500px-32bit-Endianess.svg.png" decoding="async" width="500" height="250" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/32bit-Endianess.svg/750px-32bit-Endianess.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/32bit-Endianess.svg/1000px-32bit-Endianess.svg.png 2x" data-file-width="1000" data-file-height="500" /></a><figcaption>Diagramma che mostra le differenze tra la notazione <i>little-endian</i> e quella <i>big-endian</i></figcaption></figure> <p>La differenza tra i due sistemi è data dall'ordine con cui i byte costituenti il dato da immagazzinare vengono memorizzati o trasmessi: </p> <ul><li><i>big-endian</i>: memorizzazione/trasmissione che inizia dal byte più significativo (estremità più grande) per finire col meno significativo, è utilizzata dai processori <a href="/wiki/Motorola" title="Motorola">Motorola</a>;</li> <li><i>little-endian</i>: memorizzazione/trasmissione che inizia dal byte meno significativo (estremità più piccola) per finire col più significativo, è utilizzata dai processori <a href="/wiki/Intel" title="Intel">Intel</a>;</li></ul> <p>Nota bene: il termine <i>endian</i> genera spesso confusione; per ricordare correttamente la differenza si rammenti che <i>endian</i> si riferisce alla estremità da cui il dato originale comincia a essere elaborato (scritto/letto su/da memoria o trasmesso/ricevuto su/da canale di comunicazione), non a quale estremità finisce per ultima in memoria o su canale di comunicazione. </p><p>L'ordine big-endian è stato scelto come ordine standard in molti protocolli utilizzati in <a href="/wiki/Internet" title="Internet">Internet</a>, viene perciò anche chiamato <i>network byte order</i>. Per contro viene chiamato <i>host byte order</i> l'ordine nativo dell'<a href="/wiki/Host" title="Host">host</a> </p> <div class="mw-heading mw-heading3"><h3 id="Esempi">Esempi</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=5" title="Modifica la sezione Esempi" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=5" title="Edit section's source code: Esempi"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Nel caso di una WORD (16 bit), il numero <a href="/wiki/Esadecimale" class="mw-redirect" title="Esadecimale">esadecimale</a> 0x0123 viene immagazzinato come: </p> <pre> Little-endian Big-endian +----+----+ +----+----+ |0x23|0x01| |0x01|0x23| +----+----+ +----+----+ byte: 0 1 0 1 </pre> <p>Nel caso di una DWORD (32 bit), il numero <a href="/wiki/Esadecimale" class="mw-redirect" title="Esadecimale">esadecimale</a> 0x01234567 verrà immagazzinato come: </p> <pre> Little-endian Big-endian +----+----+----+----+ +----+----+----+----+ |0x67|0x45|0x23|0x01| |0x01|0x23|0x45|0x67| +----+----+----+----+ +----+----+----+----+ byte: 0 1 2 3 0 1 2 3 </pre> <p>(Negli esempi il valore 0x01 è il byte più significativo) </p> <div class="mw-heading mw-heading2"><h2 id="Funzioni_per_la_conversione">Funzioni per la conversione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=6" title="Modifica la sezione Funzioni per la conversione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=6" title="Edit section's source code: Funzioni per la conversione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le seguenti <a href="/wiki/Funzione_(informatica)" title="Funzione (informatica)">funzioni</a> possono essere usate per convertire da little a big endian e viceversa (la conversione è perfettamente simmetrica). </p> <div class="mw-heading mw-heading3"><h3 id="Implementazione_in_C">Implementazione in C</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=7" title="Modifica la sezione Implementazione in C" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=7" title="Edit section's source code: Implementazione in C"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Conversione_di_word">Conversione di word</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=8" title="Modifica la sezione Conversione di word" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=8" title="Edit section's source code: Conversione di word"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-highlight mw-highlight-lang-c mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Endian_Word_Conversion</span><span class="p">(</span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">word</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="p">((</span><span class="n">word</span><span class="o">>></span><span class="mi">8</span><span class="p">)</span><span class="o">&</span><span class="mh">0x00FF</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="n">word</span><span class="o"><<</span><span class="mi">8</span><span class="p">)</span><span class="o">&</span><span class="mh">0xFF00</span><span class="p">)</span><span class="w"> </span><span class="p">;</span> <span class="w"> </span><span class="p">}</span> </pre></div> <div class="mw-heading mw-heading4"><h4 id="Conversione_di_double_word">Conversione di double word</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=9" title="Modifica la sezione Conversione di double word" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=9" title="Edit section's source code: Conversione di double word"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-highlight mw-highlight-lang-c mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Endian_DWord_Conversion</span><span class="p">(</span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">dword</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="p">((</span><span class="n">dword</span><span class="o">>></span><span class="mi">24</span><span class="p">)</span><span class="o">&</span><span class="mh">0x000000FF</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="n">dword</span><span class="o">>></span><span class="mi">8</span><span class="p">)</span><span class="o">&</span><span class="mh">0x0000FF00</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="n">dword</span><span class="o"><<</span><span class="mi">8</span><span class="p">)</span><span class="o">&</span><span class="mh">0x00FF0000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="n">dword</span><span class="o"><<</span><span class="mi">24</span><span class="p">)</span><span class="o">&</span><span class="mh">0xFF000000</span><span class="p">);</span> <span class="w"> </span><span class="p">}</span> </pre></div> <div class="mw-heading mw-heading3"><h3 id="Implementazione_in_C#"><span id="Implementazione_in_C.23"></span>Implementazione in C#</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=10" title="Modifica la sezione Implementazione in C#" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=10" title="Edit section's source code: Implementazione in C#"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="UInt32">UInt32</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=11" title="Modifica la sezione UInt32" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=11" title="Edit section's source code: UInt32"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-highlight mw-highlight-lang-c# mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kt">uint</span><span class="w"> </span><span class="nf">Endian_UInt32_Conversion</span><span class="p">(</span><span class="kt">uint</span><span class="w"> </span><span class="k">value</span><span class="p">){</span> <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">24</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x000000FF</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">8</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x0000FF00</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">8</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x00FF0000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">24</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">xFF000000</span><span class="p">);</span> <span class="w"> </span><span class="p">}</span> </pre></div> <div class="mw-heading mw-heading4"><h4 id="UInt64">UInt64</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=12" title="Modifica la sezione UInt64" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=12" title="Edit section's source code: UInt64"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-highlight mw-highlight-lang-c# mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kt">ulong</span><span class="w"> </span><span class="nf">Endian_UInt64_Conversion</span><span class="p">(</span><span class="kt">ulong</span><span class="w"> </span><span class="k">value</span><span class="p">){</span> <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">56</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x00000000000000FF</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">40</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x000000000000FF00</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">24</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x0000000000FF0000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="m">8</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x00000000FF000000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">8</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x000000FF00000000</span><span class="p">)</span><span class="w"> </span> <span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">24</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x0000FF00000000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">40</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">x00FF0000000000</span><span class="p">)</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">((</span><span class="k">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="m">56</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="m">0</span><span class="n">xFF000000000000</span><span class="p">);</span> <span class="w"> </span><span class="p">}</span> </pre></div> <div class="mw-heading mw-heading3"><h3 id="Implementazione_in_C++"><span id="Implementazione_in_C.2B.2B"></span>Implementazione in C++</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=13" title="Modifica la sezione Implementazione in C++" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=13" title="Edit section's source code: Implementazione in C++"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Da C++23 è disponibile <a rel="nofollow" class="external text" href="https://en.cppreference.com/w/cpp/numeric/byteswap">std::byteswap</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Uso_per_i_formati_di_data">Uso per i formati di data</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=14" title="Modifica la sezione Uso per i formati di data" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=14" title="Edit section's source code: Uso per i formati di data"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I termini <style data-mw-deduplicate="TemplateStyles:r140554517">.mw-parser-output .chiarimento{background:#ffeaea;color:#444444}.mw-parser-output .chiarimento-apice{color:#EE0700}@media screen{html.skin-theme-clientpref-night .mw-parser-output .chiarimento{background:rgba(179,36,36,0.21);color:inherit}html.skin-theme-clientpref-night .mw-parser-output .chiarimento-apice{color:#b32424}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .chiarimento{background:rgba(179,36,36,0.21);color:inherit}html.skin-theme-clientpref-os .mw-parser-output .chiarimento-apice{color:#b32424}}</style><span class="chiarimento" title="Queste informazioni non sono comprovate da fonti attendibili.">vengono alle volte usati</span><sup class="noprint chiarimento-apice" title="Queste informazioni non sono comprovate da fonti attendibili.">[<i><a href="/wiki/Wikipedia:Uso_delle_fonti" title="Wikipedia:Uso delle fonti">senza fonte</a></i>]</sup> anche per indicare il formato di data: </p> <ul><li>gg/mm/aaaa: la data europea è little-endian</li> <li>aaaa/mm/gg: la data big-endian è usata in <a href="/wiki/Giappone" title="Giappone">Giappone</a> e in <a href="/wiki/ISO_8601" title="ISO 8601">ISO 8601</a></li> <li>mm/gg/aaaa: la data usata in <a href="/wiki/Stati_Uniti_d%27America" title="Stati Uniti d'America">U.S.A.</a> è middle-endian</li></ul> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=15" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=15" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Bit" title="Bit">Bit</a></li> <li><a href="/wiki/Byte" title="Byte">Byte</a></li> <li><a href="/wiki/Byte_Order_Mark" title="Byte Order Mark">Byte Order Mark</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordine_dei_byte&veaction=edit&section=16" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordine_dei_byte&action=edit&section=16" title="Edit section's source code: Altri 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