{"id":2925,"date":"2025-01-08T10:37:11","date_gmt":"2025-01-08T10:37:11","guid":{"rendered":"https:\/\/elusivedata.io\/?p=2925"},"modified":"2025-08-14T19:31:30","modified_gmt":"2025-08-14T19:31:30","slug":"avkodning-av-varints-en-kritisk-fardighet-i-sqlite-forensics","status":"publish","type":"post","link":"https:\/\/elusivedata.io\/sv\/decoding-varints-a-critical-skill-in-sqlite-forensics\/","title":{"rendered":"Avkodning av Varints: En kritisk f\u00e4rdighet inom SQLite-forensik"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2925\" class=\"elementor elementor-2925\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f400ea3 e-flex e-con-boxed e-con e-parent\" data-id=\"f400ea3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-751fdcd elementor-widget elementor-widget-heading\" data-id=\"751fdcd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Inledning<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a11b574 elementor-widget elementor-widget-text-editor\" data-id=\"a11b574\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Mitt f\u00f6rsta m\u00f6te med varints var f\u00f6r m\u00e5nga \u00e5r sedan under en digital kriminalteknisk unders\u00f6kning av en iPhone 3GS i en mord- och mordbrandsutredning.<\/strong> Fram till dess hade mitt kriminaltekniska arbete fr\u00e4mst handlat om telefoner, s\u00e4rskilt CDMA-enheter som k\u00f6rde BREW. Varje textmeddelande lagrades i en egen fil, med en konsekvent offset och ett enkelt hexv\u00e4rde som angav l\u00e4ngden p\u00e5 meddelandet. Det var en f\u00f6ruts\u00e4gbar och v\u00e4lbekant process.<\/p>\n<p>Men med iPhone fick jag en helt ny utmaning. Meddelanden lagrades inte l\u00e4ngre som enskilda filer utan ist\u00e4llet som poster i en databas. Till skillnad fr\u00e5n hur enkelt det var med feature phones definierades inte l\u00e4ngden p\u00e5 en meddelandestr\u00e4ng av ett tydligt hex-v\u00e4rde. Ist\u00e4llet fick jag navigera i SQLite-databaser och l\u00e4ra mig att analysera nyttolaster. Det var h\u00e4r som jag st\u00f6tte p\u00e5 <strong>varints-heltal med variabel l\u00e4ngd<\/strong>-ett kompakt och effektivt s\u00e4tt att koda data. Att f\u00f6rst\u00e5 varints blev avg\u00f6rande n\u00e4r jag skulle nysta upp databasstrukturen och extrahera viktiga bevis. I det h\u00e4r fallet ledde kunskapen om varints till komprometterande fynd som i slut\u00e4ndan bidrog till att den tilltalade d\u00f6mdes f\u00f6r mordbrand och mord.<\/p>\n<p>Varints \u00e4r en grundl\u00e4ggande komponent i SQLite-databaser och m\u00f6jligg\u00f6r effektiv kodning av heltal som definierar l\u00e4ngden p\u00e5 celler, poster och specifika f\u00e4lt. F\u00f6r digitala kriminaltekniker \u00e4r avkodning av varints avg\u00f6rande f\u00f6r att avsl\u00f6ja kritisk information i databasfiler. Dessa kompakta heltal spelar en viktig roll vid kartl\u00e4ggning av tabellstrukturer, identifiering av nyttolaster f\u00f6r poster och \u00e5terst\u00e4llning av raderade eller dolda data.<\/p>\n<ul>\n<li>Det h\u00e4r blogginl\u00e4gget handlar om den viktiga roll som varints spelar i SQLite-forensik. Jag kommer att introducera <a href=\"https:\/\/elusivedata.io\/sv\/verktyg-varint-kalkylator\/?v=efad7abb323e\" style=\"\">VarInt Kalkylator<\/a>ett gratis verktyg som \u00e4r utformat f\u00f6r att f\u00f6renkla avkodningsprocessen och v\u00e4gleda dig genom en handledning som hj\u00e4lper dig att till\u00e4mpa denna kunskap i dina utredningar. Fr\u00e5n att analysera SQLite-databasposter till att rekonstruera raderade poster \u00e4r f\u00f6rst\u00e5else av varints en f\u00e4rdighet som varje kriminaltekniker b\u00f6r ha i sin verktygsl\u00e5da. Om du vill till\u00e4mpa dessa tekniker i verkliga fall, kan v\u00e5r <a href=\"https:\/\/elusivedata.io\/sv\/sqlite-forensics\/?v=efad7abb323e\">Certifierad SQLite Forensics-kurs<\/a> t\u00e4cker varints, freelists, overflow pages och mer, genom praktiska labbar och praktiska utmaningar.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ee35c3 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"8ee35c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/sv\/sqlite-forensics\/?v=efad7abb323e\">\n\t\t\t\t\t<div class=\"elementor-cta__bg-wrapper\">\n\t\t\t\t<div class=\"elementor-cta__bg elementor-bg\" style=\"background-image: url(https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/06\/SQLite-Forensics-Mobile-Apps-1024x576.jpg);\" role=\"img\" aria-label=\"SQLite-forensik i mobilappar som Instagram, Telegram, WhatsApp och Messenger - avsl\u00f6ja dolda data fr\u00e5n verkliga databaser.\"><\/div>\n\t\t\t\t<div class=\"elementor-cta__bg-overlay\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tL\u00e4r dig identifiera och avkoda varints f\u00f6r att \u00e5terst\u00e4lla och tolka kritiska data fr\u00e5n SQLite-databaser\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tV\u00e5r Certified SQLite Forensics Training tar dig fr\u00e5n identifiering av dessa kompakta heltal till fullst\u00e4ndig tolkning av databasstrukturer, \u00e5terst\u00e4llning av raderade poster och validering av verktygets utdata.\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tL\u00e4s mer \u2192 L\u00e4s mer\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0a9f034 e-flex e-con-boxed e-con e-parent\" data-id=\"0a9f034\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2d15b32 elementor-widget elementor-widget-heading\" data-id=\"2d15b32\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">F\u00f6rst\u00e5else av Varints: Att uppt\u00e4cka och avkoda dem<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1a5cdd5 elementor-widget elementor-widget-text-editor\" data-id=\"1a5cdd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Om du vill f\u00f6rdjupa dig i SQLite och digital kriminalteknik beh\u00f6ver du ha en nyckelkompetens i form av f\u00f6rst\u00e5else <strong>heltal med variabel l\u00e4ngd (varints)<\/strong>. Dessa kompakta siffror finns \u00f6verallt i SQLite-databaser och hj\u00e4lper systemet att spara utrymme genom att anv\u00e4nda s\u00e5 f\u00e5 byte som m\u00f6jligt f\u00f6r att lagra v\u00e4rden. Men de kan ocks\u00e5 vara knepiga att uppt\u00e4cka och avkoda om du inte vet vad du ska leta efter. L\u00e5t oss bryta ner det steg f\u00f6r steg.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-440d395 elementor-widget elementor-widget-heading\" data-id=\"440d395\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Vad \u00e4r en Varint?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a4ead6 elementor-widget elementor-widget-text-editor\" data-id=\"0a4ead6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En varint \u00e4r ett speciellt s\u00e4tt att lagra tal d\u00e4r talets storlek avg\u00f6r hur m\u00e5nga byte som anv\u00e4nds. Till skillnad fr\u00e5n heltal med fast l\u00e4ngd (t.ex. 4 byte eller 8 byte) kan en varint vara s\u00e5 liten som 1 byte eller s\u00e5 stor som 9 byte. Denna flexibilitet g\u00f6r varinter utrymmeseffektiva men ocks\u00e5 mer utmanande att tolka.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a4470c9 e-flex e-con-boxed e-con e-parent\" data-id=\"a4470c9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b69e6a3 elementor-widget elementor-widget-heading\" data-id=\"b69e6a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Var hittar du Varints?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1606c9a elementor-widget elementor-widget-text-editor\" data-id=\"1606c9a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>I SQLite-databaser anv\u00e4nds varints f\u00f6r att koda:<\/p><ul><li>L\u00e4ngden p\u00e5 celler eller poster i en databassida.<\/li><li>Rad-ID:n som identifierar poster p\u00e5 ett unikt s\u00e4tt.<\/li><li>L\u00e4ngden p\u00e5 data inom en posts nyttolast.<\/li><li>Diverse andra v\u00e4rden relaterade till databasstrukturen.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-313b44c e-flex e-con-boxed e-con e-parent\" data-id=\"313b44c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7398cff elementor-widget elementor-widget-heading\" data-id=\"7398cff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Nyckeln till att l\u00e4sa Varints: Markeringsbiten<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-364928d elementor-widget elementor-widget-text-editor\" data-id=\"364928d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Det f\u00f6rsta du beh\u00f6ver veta n\u00e4r du l\u00e4ser en varint \u00e4r hur du r\u00e4knar ut dess l\u00e4ngd. Varje byte i en varint har en <strong>markeringsbit<\/strong> (den mest signifikanta biten, eller MSB) som ber\u00e4ttar om det finns en annan byte till h\u00f6ger som ing\u00e5r i samma varint:<\/p><ul><li><strong>Om markeringsbiten \u00e4r 1<\/strong>\u00e4r n\u00e4sta byte ocks\u00e5 en del av varint.<\/li><li><strong>Om markeringsbiten \u00e4r 0<\/strong>har du kommit till slutet av varint.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f2113ff e-flex e-con-boxed e-con e-parent\" data-id=\"f2113ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8b63438 elementor-widget elementor-widget-heading\" data-id=\"8b63438\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Tv\u00e5 s\u00e4tt att avkoda l\u00e4ngden p\u00e5 Varints<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-32573a4 elementor-widget elementor-widget-text-editor\" data-id=\"32573a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Det finns tv\u00e5 metoder f\u00f6r att r\u00e4kna ut hur l\u00e5ng en varint \u00e4r: det l\u00e5nga s\u00e4ttet (med bin\u00e4r) och det enkla s\u00e4ttet (med hex-nibble). L\u00e5t oss g\u00e5 igenom b\u00e5da.<\/p><p><strong>Den l\u00e5nga v\u00e4gen: Att anv\u00e4nda bin\u00e4ra<\/strong><\/p><ol><li style=\"list-style-type: none;\"><ol><li>B\u00f6rja med den f\u00f6rsta byten i varint.<\/li><li>Konvertera byten till bin\u00e4r kod. Titta p\u00e5 den mest signifikanta biten (biten l\u00e4ngst till v\u00e4nster).<ul><li>Om biten \u00e4r 1 \u00e4r byten till h\u00f6ger en del av varint.<\/li><li>Om biten \u00e4r 0 har du kommit till slutet.<\/li><\/ul><\/li><li>Upprepa denna process f\u00f6r varje byte tills du hittar en byte med MSB 0.<\/li><\/ol><\/li><\/ol><p><strong>Exempel:<\/strong><\/p><ul><li>Byte: <code>0xC2<\/code> \u2192 Bin\u00e4r: 11000010 \u2192 MSB: 1 \u2192 Forts\u00e4tt.<\/li><li>Byte: <code>0x7F<\/code> \u2192 Bin\u00e4r: 01111111 \u2192 MSB: 0 \u2192 Stoppa h\u00e4r.<br \/><br \/><\/li><\/ul><p><strong>Det enkla s\u00e4ttet: Anv\u00e4nda v\u00e4nster nibble<\/strong><\/p><ol><li>Titta p\u00e5 den v\u00e4nstra nibblen (den f\u00f6rsta hexadecimalen i byten).<\/li><li>Om v\u00e4nster nibble \u00e4r 8 eller h\u00f6gre (8, 9, A, B, C, D, E eller F) \u00e4r n\u00e4sta byte en del av varint.<\/li><li>Om den v\u00e4nstra nibblan \u00e4r 7 eller l\u00e4gre (0 till 7) har du n\u00e5tt slutet av varint.<br \/><br \/><\/li><\/ol><p><strong>Varf\u00f6r detta fungerar:<\/strong> En v\u00e4nster nibble p\u00e5 8 eller mer betyder att MSB \u00e4r 1, medan en v\u00e4nster nibble p\u00e5 7 eller mindre betyder att MSB \u00e4r 0.<\/p><p><strong>Exempel:<\/strong><\/p><ul><li>Byte: <code>0xC2<\/code> \u2192 V\u00e4nster nibble: C (st\u00f6rre \u00e4n 8) \u2192 Forts\u00e4tt.<\/li><li>Byte: <code>0x7F<\/code> \u2192 V\u00e4nster nibble: 7 (mindre \u00e4n 8) \u2192 Stoppa h\u00e4r.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e1dd116 e-flex e-con-boxed e-con e-parent\" data-id=\"e1dd116\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2820676 elementor-widget elementor-widget-image\" data-id=\"2820676\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"670\" height=\"387\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03.png\" class=\"attachment-large size-large wp-image-2940\" alt=\"SQLite VarInt in hex view 03 \u2014 forensic analysis of variable-length integer encoding\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03.png.webp 670w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03-300x173.png.webp 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Varint_in_Hex_03-600x347.png.webp 600w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Varint (markerat med r\u00f6tt) anger l\u00e4ngden p\u00e5 meddelandetabellen<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-32888b9 elementor-widget elementor-widget-heading\" data-id=\"32888b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">F\u00f6rst\u00e5 variationer i cell\u00e4ngder: Ett praktiskt exempel<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c77a5d elementor-widget elementor-widget-text-editor\" data-id=\"6c77a5d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Varints anv\u00e4nds i SQLite f\u00f6r att identifiera storleken p\u00e5 <strong>celler<\/strong> p\u00e5 databassidor. Dessa celler kan inneh\u00e5lla allt fr\u00e5n tabeller till tabellposter, och en cells f\u00f6rsta byte(n) talar om f\u00f6r oss hur stor cellen \u00e4r. Denna l\u00e4ngdindikator \u00e4r i sig sj\u00e4lv en varint, som kan variera fr\u00e5n 1 till 9 byte i l\u00e4ngd.<\/p><h4><strong>Exempel fr\u00e5n den verkliga v\u00e4rlden: WAL-fil<\/strong><\/h4><p>I det h\u00e4r exemplet inneh\u00e5ller cellen <strong>tabell \u00f6ver meddelanden<\/strong>. Den f\u00f6rsta byten i cellen \u00e4r <code>0x81<\/code>, vilket indikerar en varint p\u00e5 tv\u00e5 byte.<\/p><ul><li><strong>Uppdelning:<\/strong><ul><li>Byte 1: <code>0x81<\/code> \u2192 Bin\u00e4r: 10000001 \u2192 Markeringsbit: 1 \u2192 Forts\u00e4tt.<\/li><li>Byte 2: <code>0x07<\/code> \u2192 Bin\u00e4r: 00000111 \u2192 Markeringsbit: 0 \u2192 Stopp.<\/li><\/ul><\/li><\/ul><h4><strong>Avkodning<\/strong><strong>med Varint<\/strong><\/h4><p>Nu m\u00e5ste vi avkoda varint. Om vi helt enkelt konverterar v\u00e4rdet <code>0x8107<\/code> till ett heltal, skulle vi felaktigt ber\u00e4kna ett stort tal, 33 031, som uppenbarligen inte st\u00e4mmer \u00f6verens med cellens faktiska storlek.<\/p><p><strong>Varf\u00f6r d\u00e5?<\/strong><br \/>Mark\u00f6rbitarna bidrar inte till det faktiska v\u00e4rdet av varint. F\u00f6r att avkoda varint p\u00e5 r\u00e4tt s\u00e4tt m\u00e5ste vi <strong>ta bort mark\u00f6rbitarna<\/strong> och tolkar endast de meningsfulla delarna av den bin\u00e4ra representationen. S\u00e5 h\u00e4r g\u00e5r det till:<\/p><ul><li><strong>Avkoda:<\/strong><ul><li>Ta bort markeringsbitar: 0000001 och 0000111.<\/li><li>Kombinera de tv\u00e5 septetterna: 00000000 10000111 \u2192 Decimal: 135.<\/li><\/ul><\/li><li>Cellens l\u00e4ngd \u00e4r 135 byte (exklusive varint och ROWID).<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae9848d elementor-widget elementor-widget-video\" data-id=\"ae9848d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=5Gr4LtE-_iE&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7df1e43 e-flex e-con-boxed e-con e-parent\" data-id=\"7df1e43\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f2f28f2 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"f2f28f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/sv\/sqlite-forensics\/?v=efad7abb323e\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tV\u00e5r SQLite Forensics-utbildning ger dig en steg-f\u00f6r-steg-process f\u00f6r att avkoda varints, freelists och andra interna strukturer - s\u00e5 att du kan arbeta bortom verktygsbegr\u00e4nsningar.\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tL\u00e4s mer \u2192 L\u00e4s mer\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fa75970 elementor-widget elementor-widget-heading\" data-id=\"fa75970\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Anv\u00e4nda Varint-kalkylatorn f\u00f6r effektivitet<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-52213a4 elementor-widget elementor-widget-text-editor\" data-id=\"52213a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Den <a href=\"https:\/\/elusivedata.io\/sv\/verktyg-varint-kalkylator\/?v=efad7abb323e\">Varint kalkylator<\/a> f\u00f6renklar denna process. Ange hex-v\u00e4rdet (t.ex. 8107) f\u00f6r att snabbt avkoda varint. F\u00f6r ovanst\u00e5ende exempel returnerar r\u00e4knaren 135, vilket bekr\u00e4ftar l\u00e4ngden.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-98af75a e-flex e-con-boxed e-con e-parent\" data-id=\"98af75a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-afaeca0 elementor-widget elementor-widget-image\" data-id=\"afaeca0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"402\" height=\"412\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1.png\" class=\"attachment-large size-large wp-image-2951\" alt=\"Calculator for SQLite forensics \u2014 forensic hex value calculation and conversion tool\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1.png.webp 402w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Calculator_1-293x300.png.webp 293w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Konvertering av varint 0x8107 till decimal 135<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f3ada8e e-flex e-con-boxed e-con e-parent\" data-id=\"f3ada8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8882a6a elementor-widget elementor-widget-heading\" data-id=\"8882a6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Avkodning av Varints i skivhuvuden<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24e5c3b elementor-widget elementor-widget-text-editor\" data-id=\"24e5c3b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>I SQLite anv\u00e4nds varints f\u00f6r att definiera posthuvuden:<\/p><ol><li><strong>L\u00e4ngd:<\/strong> Hur mycket data som ska l\u00e4sas.<\/li><li><strong>Typ:<\/strong> Hur man tolkar data (heltal, str\u00e4ng, BLOB, etc.).<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-93e73f3 e-flex e-con-boxed e-con e-parent\" data-id=\"93e73f3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e42e020 elementor-widget elementor-widget-image\" data-id=\"e42e020\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"670\" height=\"387\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint.png\" class=\"attachment-large size-large wp-image-2955\" alt=\"SQLite record header string length VarInt \u2014 forensic analysis of text field encoding\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint.png.webp 670w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint-300x173.png.webp 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/record-header-string-length-varint-600x347.png.webp 600w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Varint 0x25 i detta posthuvud anger l\u00e4ngden p\u00e5 str\u00e4ngen i nyttolasten<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2c705b3 e-flex e-con-boxed e-con e-parent\" data-id=\"2c705b3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2407d45 elementor-widget elementor-widget-text-editor\" data-id=\"2407d45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><strong>Exempel: Str\u00e4ngens l\u00e4ngd<\/strong><\/h4>\nL\u00e5t oss avkoda en varint i ett posthuvud:\n<ul>\n \t<li><strong>Varint:<\/strong> <code>0x25<\/code>\n<ul>\n \t<li>V\u00e4nster nibble: 2 (mindre \u00e4n 8) \u2192 Varint med en byte.<\/li>\n \t<li>Decimal: 37.<\/li>\n<\/ul>\n<\/li>\n \t<li><strong>Nyttolast:<\/strong> Str\u00e4ngens l\u00e4ngd = 12 byte (+97444455667).<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c99b93d e-flex e-con-boxed e-con e-parent\" data-id=\"c99b93d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f8fbf4b elementor-widget elementor-widget-image\" data-id=\"f8fbf4b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"295\" height=\"300\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-295x300.png\" class=\"attachment-medium size-medium wp-image-8526\" alt=\"SQLite VarInt Calculator tool \u2014 decode variable-length integers in forensic analysis\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-295x300.png.webp 295w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-768x781.png.webp 768w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-12x12.png.webp 12w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38-600x610.png.webp 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2025\/01\/Skarmavbild-2025-06-04-kl.-16.33.38.png.webp 812w\" sizes=\"(max-width: 295px) 100vw, 295px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Varint calculator omvandlar varint till str\u00e4ngar och BLOB-l\u00e4ngder<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a6e38f e-flex e-con-boxed e-con e-parent\" data-id=\"7a6e38f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ea4454 elementor-widget elementor-widget-heading\" data-id=\"7ea4454\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Avslutande tankar<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a55de6 elementor-widget elementor-widget-text-editor\" data-id=\"6a55de6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Att f\u00f6rst\u00e5 och avkoda varint \u00e4r en h\u00f6rnsten f\u00f6r alla digitala kriminaltekniker som arbetar med SQLite-databaser. Dessa kompakta heltal \u00e4r nyckeln till att tolka databasstrukturer, best\u00e4mma cellstorlekar och \u00e5terst\u00e4lla data p\u00e5 ett effektivt s\u00e4tt.<\/p>\n<p>Med verktyg som <a href=\"https:\/\/elusivedata.io\/sv\/verktyg-varint-kalkylator\/?v=efad7abb323e\">Varint Kalkylator,<\/a> blir processen mer tillg\u00e4nglig, vilket g\u00f6r att kriminaltekniker kan fokusera p\u00e5 att avsl\u00f6ja sanningen som d\u00f6ljs i digitala bevis. Att beh\u00e4rska varints \u00e4r mer \u00e4n en teknisk f\u00e4rdighet - det \u00e4r en viktig f\u00f6rm\u00e5ga som direkt kan p\u00e5verka resultatet av utredningar.<\/p>\n<p>Du kan l\u00e4sa mer och ladda ner <a href=\"https:\/\/elusivedata.io\/sv\/verktyg-varint-kalkylator\/?v=efad7abb323e\">Varint kalkylator <\/a>h\u00e4r:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b4cf2b5 elementor-widget elementor-widget-button\" data-id=\"b4cf2b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/elusivedata.io\/sv\/verktyg-varint-kalkylator\/?v=efad7abb323e\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Ladda ner VarInt Kalkylator<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b6082e2 elementor-widget elementor-widget-heading\" data-id=\"b6082e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Du kanske ocks\u00e5 \u00e4r intresserad av<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62b1289 elementor-widget elementor-widget-video\" data-id=\"62b1289\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=QFn63mQ5_gI&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7413dc6 elementor-cta--layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-bg-transform elementor-bg-transform-zoom-in elementor-widget elementor-widget-call-to-action\" data-id=\"7413dc6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<a class=\"elementor-cta\" href=\"https:\/\/elusivedata.io\/sv\/ed-sqlite-visualizer\/?v=efad7abb323e\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tSQLite Visualizer. Ett helt nytt s\u00e4tt att utforska SQLite.\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tDen kommande ED SQLite Visualizer l\u00e5ter dig se databasens interna funktioner, \u00e5terst\u00e4lla dolda poster och koppla ihop punkterna snabbare \u00e4n n\u00e5gonsin, allt visuellt. Anv\u00e4nds redan i v\u00e5r fullst\u00e4ndiga SQLite-kurs och \u00e4r snart tillg\u00e4nglig f\u00f6r alla. \t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<span class=\"elementor-cta__button elementor-button elementor-size-\">\n\t\t\t\t\t\tSe vad som komma skall \u2192.\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Varints \u00e4r ryggraden i SQLites effektiva datalagring och kodar v\u00e4rden i ett kompakt format som digitala kriminaltekniska utredare m\u00e5ste avkoda f\u00f6r att avsl\u00f6ja kritiska bevis. Den h\u00e4r bloggen dyker in i avkodningsprocessen, exempel fr\u00e5n verkligheten och verktyg som Varint Calculator f\u00f6r att f\u00f6renkla kriminalteknisk analys.<\/p>","protected":false},"author":1,"featured_media":2926,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-2925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile-forensics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Decoding Varints: A Critical Skill in SQLite Forensics - Elusive Data<\/title>\n<meta name=\"description\" content=\"Decoding variable-length integers (Varints) is a critical skill in SQLite forensics. Learn how Varints work, where they appear in mobile app databases, and how to decode them manually.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elusivedata.io\/sv\/avkodning-av-varints-en-kritisk-fardighet-i-sqlite-forensics\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Decoding Varints: A Critical Skill in SQLite Forensics\" \/>\n<meta property=\"og:description\" content=\"Decoding variable-length integers (Varints) is a critical skill in SQLite forensics. 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