{"id":53599,"date":"2019-12-05T00:00:00","date_gmt":"2019-12-04T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj"},"modified":"2020-02-18T14:01:31","modified_gmt":"2020-02-18T11:01:31","slug":"samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","title":{"rendered":"Najbolj priljubljen primer Java kode na StackOverflow se je izkazal za napa\u010dnega","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Najbolj priljubljen <noindex><a rel=\"nofollow\" href=\"https:\/\/stackoverflow.com\/questions\/3758606\/how-to-convert-byte-size-into-human-readable-format-in-java\/3758880#3758880\">primer Java kode<\/a><\/noindex>, objavljen na StackOverflow, <noindex><a rel=\"nofollow\" href=\"https:\/\/programming.guide\/worlds-most-copied-so-snippet.html\">se je izkazal<\/a><\/noindex> za napako, ki pri dolo\u010denih pogojih povzro\u010da napa\u010den izpis. Obravnavana koda je bila objavljena leta 2010 in je prejela ve\u010d kot tiso\u010d priporo\u010dil ter bila <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1802.02938.pdf\">kopirana<\/a><\/noindex> v mnoge projekte in se pojavlja v repozitorijih na GitHubu pribli\u017eno 7000-krat. Zanimivo je, da napake niso odkrili uporabniki, ki so to kodo kopirali v svoje projekte, temve\u010d izvirni avtor nasveta.<\/p>\n<p>Obravnavani koda je pretvarjal velikost bajtov v \u010ditljivo obliko, na primer, 110592 je pretvoril v &#171;110.6 kB&#187; ali &#171;108.0 KiB&#187;. Koda je bila predlagana kot optimizirana s pomo\u010djo logaritmov variant prej predlaganega nasveta, kjer je bila velikost dolo\u010dena na podlagi zaporednega deljenja izvirne vrednosti v ciklu na 1018, 1015, 1012, 1019,<br \/>\n106, 103 in 100, dokler je bil delitelj ve\u010dji od izvirne vrednosti v bajtih. Zaradi neto\u010dnih izra\u010dunov v optimizirani razli\u010dici (prekora\u010ditev dolgega vrednosti) rezultat obdelave zelo velikih \u0161tevil (eksabajtov) ni bil pravilen. <\/p>\n<p>Avtor nasveta je prav tako posku\u0161al opozoriti na problem kopiranja primerov brez navedbe vira in brez navedbe licence. Po podatkih prej <noindex><a rel=\"nofollow\" href=\"https:\/\/empirical-software.engineering\/assets\/pdf\/icse19-snippets-slides.pdf\">izvedenega raziskovanja<\/a><\/noindex> 46% razvijalcev je kopiralo kodo s StackOverflow brez navedbe avtorja, 75% ni vedelo, da je koda raz\u0161irjena pod licenco CC BY-SA, in 67% ni vedelo, da to pomeni potrebo po navedbi avtorstva.<\/p>\n<p>Po <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1910.01321.pdf\">podatkov<\/a><\/noindex> druge raziskave, kopiranje primerov kode ni povezano le z tveganjem za napake v kodi, temve\u010d tudi z ranljivostmi. Na primer, z analizo 72483 primerov kode v C++ na StackOverflow so raziskovalci odkrili resne ranljivosti v 69 primerih (kar pomeni 0,09%), ki so vklju\u010deni na seznam najbolj priljubljenih priporo\u010dil. Po analizi prisotnosti te kode na GitHubu se je izkazalo, da ranljiva koda, kopirana iz StackOverflow, obstaja v 2859 projektih.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51982\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0430\u043c\u044b\u0439 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440 Java-\u043a\u043e\u0434\u0430, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043d\u0430 StackOverflow, \u043e\u043a\u0430\u0437\u0430\u043b\u0441\u044f \u0441 \u043e\u0448\u0438\u0431\u043a\u043e\u0439, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u0432\u044b\u0432\u043e\u0434\u0443 \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u043d\u0435\u0432\u0435\u0440\u043d\u043e\u0433\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430. \u0420\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0439 \u043a\u043e\u0434 \u0431\u044b\u043b \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u0432 2010 \u0433\u043e\u0434\u0443 \u0438 \u043d\u0430\u043a\u043e\u043f\u0438\u043b \u0431\u043e\u043b\u0435\u0435 \u0442\u044b\u0441\u044f\u0447\u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0431\u044b\u043b \u0441\u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0435 \u043f\u0440\u043e\u0435\u043a\u0442\u044b \u0438 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f\u0445 \u043d\u0430 GitHub \u043e\u043a\u043e\u043b\u043e 7 \u0442\u044b\u0441\u044f\u0447 \u0440\u0430\u0437. \u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043e\u0448\u0438\u0431\u043a\u0443 \u043d\u0430\u0448\u043b\u0438 \u043d\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438, \u043a\u043e\u043f\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-53599","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta 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