{"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\/cs\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","title":{"rendered":"Nejpopul\u00e1rn\u011bj\u0161\u00ed p\u0159\u00edklad Java k\u00f3du na StackOverflow se uk\u00e1zal b\u00fdt chybou","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nejpopul\u00e1rn\u011bj\u0161\u00ed p\u0159\u00edklad Java k\u00f3du<\/a><\/noindex>, publikovan\u00e9ho na StackOverflow, se uk\u00e1zal<\/a><\/noindex> b\u00fdt chybou, kter\u00e1 za ur\u010dit\u00fdch podm\u00ednek vede k nespr\u00e1vn\u00e9mu v\u00fdsledku. Zmi\u0148ovan\u00fd k\u00f3d byl zve\u0159ejn\u011bn v roce 2010 a z\u00edskal v\u00edce ne\u017e tis\u00edc doporu\u010den\u00ed, a tak\u00e9 byl zkop\u00edrov\u00e1n<\/a><\/noindex> do mnoha projekt\u016f a objevuje se v repozit\u00e1\u0159\u00edch na GitHubu p\u0159ibli\u017en\u011b 7 tis\u00edckr\u00e1t. Zaj\u00edmav\u00e9 je, \u017ee chybu nenalezli u\u017eivatel\u00e9 kop\u00edruj\u00edc\u00ed tento k\u00f3d do sv\u00fdch projekt\u016f, ale p\u016fvodn\u00ed autor rady.<\/p>\n

Zva\u017eovan\u00fd k\u00f3d p\u0159ev\u00e1d\u011bl velikost v bytech na \u010ditelnou formu, nap\u0159\u00edklad 110592 p\u0159ev\u00e1d\u011bl na «110.6 kB» nebo «108.0 KiB». K\u00f3d byl navr\u017een jako optimalizovan\u00fd pomoc\u00ed logaritm\u016f, co\u017e je varianta d\u0159\u00edve navrhovan\u00e9 rady, kde se hodnota ur\u010dovala na z\u00e1klad\u011b sekven\u010dn\u00edho d\u011blen\u00ed p\u016fvodn\u00ed hodnoty v cyklu na 1018, 1015, 1012, 1019,
\n106, 103 a 100, dokud byl d\u011blitel v\u011bt\u0161\u00ed ne\u017e p\u016fvodn\u00ed hodnota v bajtech. Kv\u016fli nedbal\u00fdm v\u00fdpo\u010dt\u016fm v optimalizovan\u00e9 variant\u011b (p\u0159ete\u010den\u00ed hodnoty long) v\u00fdsledek pr\u00e1ce p\u0159i zpracov\u00e1n\u00ed velmi velk\u00fdch \u010d\u00edsel (exabajt\u016f) neodpov\u00eddal skute\u010dnosti. <\/p>\n

Autor rady se tak\u00e9 pokusil upozornit na probl\u00e9m kop\u00edrov\u00e1n\u00ed p\u0159\u00edklad\u016f bez odkazu na zdroj a bez uveden\u00ed licence. Podle d\u0159\u00edve prov\u00e1d\u011bn\u00e9ho v\u00fdzkumu<\/a><\/noindex> 46 % v\u00fdvoj\u00e1\u0159\u016f zkop\u00edrovalo k\u00f3d ze StackOverflow bez uveden\u00ed autora, 75 % nev\u011bd\u011blo, \u017ee k\u00f3d je \u0161\u00ed\u0159en pod licenc\u00ed CC BY-SA, a 67 % nev\u011bd\u011blo, co to obn\u00e1\u0161\u00ed.<\/p>\n

Podle informac\u00ed<\/a><\/noindex> Podle jin\u00e9ho v\u00fdzkumu je kop\u00edrov\u00e1n\u00ed p\u0159\u00edklad\u016f k\u00f3du spojeno nejen s rizikem chyb v k\u00f3du, ale i s t\u00edm, \u017ee obsahuj\u00ed zranitelnosti. Nap\u0159\u00edklad anal\u00fdzou 72483 p\u0159\u00edklad\u016f k\u00f3du na C++ na StackOverflow v\u00fdzkumn\u00edci zjistili z\u00e1va\u017en\u00e9 zranitelnosti ve 69 p\u0159\u00edkladech (co\u017e p\u0159edstavuje 0,09 %), kter\u00e9 pat\u0159\u00ed do seznamu nejpopul\u00e1rn\u011bj\u0161\u00edch doporu\u010den\u00ed. P\u0159i n\u00e1sledn\u00e9 anal\u00fdze p\u0159\u00edtomnosti tohoto k\u00f3du na GitHubu bylo zji\u0161t\u011bno, \u017ee zkop\u00edrovan\u00fd ze StackOverflow zraniteln\u00fd k\u00f3d je p\u0159\u00edtomen v 2859 projektech.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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