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MD5SUM (Matéria)

by tadeufilippini (via)
Matérias / Matéria MD5SUM Como verificar a integridade de arquivos puxados da Internet Por Fábio Melatti em 21/Out/2003 O MD5SUM é um programa de domínio público usado para verificar mensagens criptografadas e integridade de arquivos. Portanto quando as ISOs são feitas é usado o MD5SUM para que você possa ter certeza que a ISO que foi baixada é exatamente igual a que está no servidor. Por ser uma ferramenta de 128-bit te dá uma excelente garantia de que o seu arquivo está exatamente igual ao original, a menos que os md5sums sejam diferentes ;-), pois qualquer alteração em meio bit do arquivo resultará em um conjunto de caracteres totalmente diferentes. Quando o MD5SUM é rodado sobre um arquivo é gerado um conjunto de 32 caracteres, semelhante a esse: dddb5786219f57fef20b0ae3616afc67 isoqualquer.1.3-5.iso Pronto, agora que sabemos o que é e para que serve, vamos para a parte prática. As distribuições Linux por padrão já incluem o programa MD5SUM, por isso não há muito trabalho, basta abrir qualquer terminal e digitar: md5sum isoqualquer.1.3.iso E depois de algum tempo, afinal de contas estamos verificando arquivos de 650 MB em média, ele retornará um conjunto de caracteres, então é só conferir com o md5sum do servidor. É claro que agora vem a pergunta clássica, mas eu estou usando o Windows, como vou usar o MD5SUM? Ai você terá duas opções, existem aqui mesmo no Superdownloads versões de MD5SUM para rodar no ambiente gráfico do Windows e em janela do DOS, fica a sua escolha, as duas fazem exatamente a mesma coisa. Usando a versão para janela do DOS é só ir para a pasta em que está a ISO e dar o mesmo comando acima, como no Linux. Se você tiver o problema de limite de caracteres com o nome do arquivo do tipo, 8 caracteres para o nome e 3 para a extensão (8.3), renomeie o arquivo para outro nome similar que fique dentro desses limites. Caso queira mais opções com o MD5SUM, digite: md5sum -h Na versão gráfica antes de mais nada é necessário instalar o programa, depois rode e escolha a pasta onde está a ISO e clique em "create sums", vá tomar um café, e depois de algums minutos você verá um monte de números e letras na frente do nome do arquivo, é o seu md5sum. Dicas importantes Caso o md5sum da ISO que você baixou não bater com o que está no Superdownloads, antes de apagar e começar a baixar novamente, verifique o md5sum do servidor de onde você baixou, por exemplo, se você utilizou este link "ftp://ftp.univie.ac.at/systems/linux/Mandrake/iso/Mandrake91-cd1-inst.i586.iso", é só tirar o nome do arquivo e abrir no seu navegador, ficaria assim esse link "ftp://ftp.univie.ac.at/systems/linux/Mandrake/iso/", lá estará a relação das ISOs e o md5sum. É dificil, mas ocasionalmente pode haver uma pequena diferença nas ISOs de um servidor para outro, o que resulta em um md5sum diferente. Para fazer o download das ISOs é preciso usar o modo binário (binary mode), pois se for usado o modo ASCII (como a maioria dos navegadores fazem), com certeza haverá alteração dos dados durante a transferência e sua ISO será corrompida e o m5sum nunca irá bater. Por isso sempre utilize um cliente de FTP ou gerenciador de download com a função de continuar downloads interrompidos (muito importante considerando o tamanho dos arquivos) e que faça o download em modo binário (binary mode). Links relacionados # Todos os softwares relacionados a MD5

October 2009

September 2009

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August 2009

Up-conversion using XSLT 2.0

by karlcow

The paper shows case study of a multi-phase transformation taking data from a legacy ASCII-based interchange format, to XML based on a standardized vocabulary. The transformations illustrate the power of new features including regular expression handling, grouping, recursive functions, and schema-aware processing.

July 2009

June 2009

May 2009

ASCII.jp:黒船Google汐留沖に出現でWeb広告業界に激震!

by kuroyagi
"たとえば月間公称70億PVの某ブログサービスはGoogle Ad Plannerによると20億PV以下。標準的なPVの計測方法がないとはいえ、ここまで乖離していると媒体資料の信憑性が問われてしまうだろう。"

Comment encoder des données dans une URL

by decembre
Je m’explique. Vous pouvez créez de toute pièce une URL contenant un fichier, qu’il soit image, ascii, texte ou encore xml. Celle-ci se forme de cette façon pour une image par exemple: data:image/jpeg;base64,jpeg_encodée_en_base64Quoiqu’il en soit, voici comment faire ! Tout d’abord, il faut convertir votre fichier en base64. Moi je vais convertir une image. Il a des tas de sites qui fond ça mais celui là est sympa: http://www.sveinbjorn.org/dataurlmaker Plus votre fichier est gros, plus ces lignes de codées seront longues. Il suffit ensuite de replacer cette chaine dans les tags cité ci dessus: <img src="data:image/jpeg;base64,ICI_LE_CODE_BASE64"> et le tour est joué !

April 2009

10 tutoriels PHP originaux sur la création d’une shoutbox, une complétion trés design à la Apple, etc.

by eledo34
10 tutoriels PHP originaux sur la création d’une shoutbox, une complétion trés design à la Apple, un script qui transforme une image en ascii art, etc.

February 2009

PDFfing.htm: Tout sur le PDF (Hack), by fravia+ pdffing (2005)

by decembre
Introduction PDF-related essays Converting any file to PDF Converting an Acrobat PDF into ASCII The modern art of HTML2PDF conversion Enabling Print-Challenged PDF Files The use of pdf2txt@adobe.com De-protecting PDF files PDF tools Cleaning Adobe bloated reader 6 "Remote Approach" pdf malware

January 2009

ASCII by Jason Scott / FUCK THE CLOUD

by karlcow & 2 others (via)

Don’t blow anything into the Cloud that you don’t have a personal copy of.

ASCII by Jason Scott / Datapocalypso!

by night.kame

And as for “free”, I think we’re going to have a few rounds of root beers over whether a place, like Google, that browses through your e-mail via robots and uses it to generate statistically relevant advertisements on your page, or places like Flickr that do in fact have advertisements for seeing your content and charge you on top of that for additional features, or places like Ustream that have profit-sharing and used to do indirect advertisement but now overlay ads on your content, are “free”. Some people confuse “no money down” with free and that’s why they’re getting fucking kicked out of their houses, finding themselves at the mercy and procedures of actual eviction law.

Peu de choses sont réellement gratuites, et même quand elles semblent l'être, votre propriété est en réalité très limitée.

December 2008

Hourri o/

by onizuka
\o/ Hourri \o/ Le site dédié au bonheur universel et ascii

November 2008

Language (API) Processing 1.0

by Neewok & 1 other
The biggest changes in the months prior to release 1.0 are as follows:
  • Libraries - All libraries must be placed in a folder named "libraries", inside the sketchbook folder. Do not use the main "libraries" directory in the Processing distribution, as it is reserved for the core libraries, and is not visible on Mac OS X.
  • XML - The XML library is now included by default, so you won't find it in the Import Library menu anymore. In addition, the XML library since 0135 has been greatly improved, making it compatible with far more documents.
  • Processing.app - The Mac OS X release of Processing is now a single .app file, more befitting an OS X application.
  • Processing.exe - The Windows release has a new launcher based on launch4j. Unfortunately, some machines have a problem with the new launcher that we haven't been able to track down. If you have trouble, please help us find the problem. PDE files are also now double-clickable on Windows.
  • OpenGL - All OpenGL sketches now use 2x full screen anti-aliasing. This means that these sketches are always smooth, and the smooth() and noSmooth() commands are ignored. To return to the behavior found in the beta releases, see the hint() reference.
  • P2D and P3D - The P2D renderer has returned (see the size() reference) and smoothing is now enabled for both P2D and P3D. Smoothing support is unfortunately incomplete, however, and sometimes thin lines can be seen inside shapes. This is a very high priority bug to be fixed in a future release.
  • Candy and PShape - The Candy SVG library has been merged into the core, which brings along a new loadShape() command and a new PShape object. The special powers of PShape will be rolled out in future releases. For the time being, loadShape() works best with the default renderer (JAVA2D). Complex shapes will often appear jagged or not at all when rendered with P2D, P3D, and OPENGL. We've also added better support for SVG files created with Inkscape.
  • PVector - We've added a new class called PVector, which is a simple three-dimensional vector (also known as point or tuple) class. This is useful for storing point data, or operations on 3D points.
  • Tools - A new Tools API has been created for developers who want to contribute code that extends the Processing Development Environment in some fashion. Let your creativity flow with fantastical contributions like "Color Selector 2.0", "ROT13 Code Mangler", and "I Am Rich". Visit the developer page on tools for more information. Similar to libraries, tools are installed in a folder of the same name within your sketchbook folder.
  • Asynchronouse Images - Big JPEGs and small pipes? We've added a new requestImage() that loads an image in the background so that your sketch doesn't freeze when loading lots of large images over a slow connection.
  • Present - Present mode (full screen) is handled differently. When run inside the PDE, only Mac OS X uses exclusive mode with Present. Windows and Linux just do full screen windows. When run outside the PDE, all three simply create an undecorated window the size of the entire screen, and on the Mac, an option is added to the Info.plist file to hide the dock and menubar (since that cannot be done programatically from Java).
  • Compiler - We've removed the old Jikes compiler and are now using another. We've also tried hard to improve the quality of error messages, though some are still real gems that invoke the complaints of mainframe computers in 1970s films.
  • Internationalization - For better internationalization support, we've changed to UTF-8 encoding when loading and saving sketches. Sketches that contain non-ASCII characters and were saved with Processing 0140 and earlier may look strange when opened. Garbled text and odd characters may appear where umlauts, cedillas, and Japanese formerly lived. If this happens, use the "Fix Encoding & Reload" option under the Tools menu. This will reload your sketch using the same method as previous versions of Processing, at which point you can re-save it which will write a proper UTF-8 version.
  • Java - Linux and Windows now inlude Java 6 update 10 with the download. We still don't have support for Java 1.5 syntax yet, but we hope that the performance boosts in Java 6 will help applications run well.

October 2008

Quelques tables de caractères

by tehu & 2 others
Tables de caractères très pratiques, avec ASCII, ISO-8859-1, ISO-8859-15, CP1252, CP850, MacRoman (et Unicode, UTF-8)

Quelques tables de caractères

by parmentierf & 2 others
Tables de caractères très pratiques, avec ASCII, ISO-8859-1, ISO-8859-15, CP1252, CP850, MacRoman (et Unicode, UTF-8)

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