{"id":150228,"date":"2025-12-01T17:11:56","date_gmt":"2025-12-01T15:11:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/deniel-bernshtejn-obnovil-biblioteku-cdb"},"modified":"2025-12-01T17:11:56","modified_gmt":"2025-12-01T15:11:56","slug":"deniel-bernshtejn-obnovil-biblioteku-cdb","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/deniel-bernshtejn-obnovil-biblioteku-cdb","title":{"rendered":"Daniel Bernstein atualizou a biblioteca cdb","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Daniel Bernstein (Daniel J. Bernstein), renomado especialista em criptografia e desenvolvimento de software seguro, famoso por projetos como qmail, djbdns, NaCl, Ed25519, Curve25519 e ChaCha20-Poly1305, publicou a vers\u00e3o do projeto cdb 20250121, que oferece um formato de armazenamento de dados e uma biblioteca auxiliar para a integra\u00e7\u00e3o em aplicativos de fun\u00e7\u00f5es para operar com bancos de dados no formato chave\/valor. Esta vers\u00e3o foi criada ap\u00f3s mais de 25 anos desde a \u00faltima atualiza\u00e7\u00e3o do cdb 0.75, lan\u00e7ada em fevereiro de 2000.       <\/p>\n<p>Na nova vers\u00e3o foi implementado o formato cdb64, traduzido para estruturas com tipos de 64 bits. Em plataformas de 64 bits, o novo formato permite a cria\u00e7\u00e3o de bancos de dados com tamanho de at\u00e9 um exabyte (anteriormente, o tamanho do banco de dados n\u00e3o podia exceder 4 GB). O banco de dados \u00e9 muito compacto e utiliza um cabe\u00e7alho de 4096 bytes e 48 bytes de informa\u00e7\u00f5es de controle para cada registro (para a variante de 32 bits, o cabe\u00e7alho \u00e9 de 2048 e 24 bytes por registro). Ao acessar o banco de dados, s\u00e3o realizadas apenas duas opera\u00e7\u00f5es de acesso ao disco quando a chave est\u00e1 presente e uma opera\u00e7\u00e3o quando n\u00e3o est\u00e1. Suporte \u00e9 oferecido para a substitui\u00e7\u00e3o at\u00f4mica do banco de dados, resiliente a encerramentos inesperados e que n\u00e3o bloqueia o acesso para leitura.        <\/p>\n<p>Outras altera\u00e7\u00f5es:  <\/p>\n<ul>\n<li class=\"l\"> Suporte para compila\u00e7\u00e3o utilizando o script configure e instala\u00e7\u00e3o com o comando \u00abmake install\u00bb.\n<li class=\"l\">  Removida a vincula\u00e7\u00e3o de scripts de teste ao csh.\n<li class=\"l\"> Todos os valores inteiros internos foram substitu\u00eddos pelo tipo \u00abnum\u00bb, definido como \u00ablong long\u00bb. As fun\u00e7\u00f5es uint32, fmt e scan foram substitu\u00eddas por fun\u00e7\u00f5es que operam com o tipo num.\n<li class=\"l\"> A interface do programa para trabalhar com buffers foi dividida em inbuf e outbuf. A interface hier foi limpada.\n<li class=\"l\"> Defini\u00e7\u00f5es de fun\u00e7\u00f5es n\u00e3o utilizadas foram removidas do c\u00f3digo.\n<li class=\"l\"> Interrup\u00e7\u00e3o do uso de wrappers, como str_len, alloc, uint32, exit, error e systype.\n<li class=\"l\"> O c\u00f3digo foi reestruturado para interromper o uso de constru\u00e7\u00f5es C obsoletas, como o estilo antigo de defini\u00e7\u00e3o de fun\u00e7\u00f5es, prot\u00f3tipos vazios e o estilo antigo de defini\u00e7\u00e3o de main().\n<li class=\"l\"> Defini\u00e7\u00f5es const e static foram ativadas.\n<li class=\"l\"> Ao compilar, a flag \u00ab-Wall\u00bb foi ativada e o c\u00f3digo foi limpo para eliminar avisos.\n<li class=\"l\"> As op\u00e7\u00f5es -fwrapv, -fno-delete-null-pointer-checks, -fno-strict-aliasing e -fno-strict-overflow foram inclu\u00eddas na compila\u00e7\u00e3o.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64352\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u044d\u043d\u0438\u044d\u043b \u0411\u0435\u0440\u043d\u0448\u0442\u0435\u0439\u043d (Daniel J. Bernstein), \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0442 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0438 \u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0433\u043e \u041f\u041e, \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u0432\u0448\u0438\u0439 \u0442\u0430\u043a\u0438\u0435 \u043f\u0440\u043e\u0435\u043a\u0442\u044b, \u043a\u0430\u043a qmail, djbdns, NaCl, Ed25519, Curve25519 \u0438 ChaCha20-Poly1305, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 cdb 20250121, \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0433\u043e \u0444\u043e\u0440\u043c\u0430\u0442 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0441\u043e\u043f\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0443\u044e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 \u0434\u043b\u044f \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u043d\u0438\u044f \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0411\u0414 \u0432 \u0444\u043e\u0440\u043c\u0435 \u043a\u043b\u044e\u0447\/\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0412\u044b\u043f\u0443\u0441\u043a \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d \u0441\u043f\u0443\u0441\u0442\u044f \u0431\u043e\u043b\u0435\u0435 25 \u043b\u0435\u0442 [&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-150228","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u044d\u043d\u0438\u044d\u043b \u0411\u0435\u0440\u043d\u0448\u0442\u0435\u0439\u043d (Daniel J.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/pt\/blog\/news\/deniel-bernshtejn-obnovil-biblioteku-cdb\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"pt_PT\" \/>\n\t\t<meta 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