compression

How to find a good/optimal dictionary for zlib 'setDictionary' when processing a given set of data?

由 只愿长相守 提交于 2019-11-27 00:45:26
问题 I have a (huge) set of similar data files. The set is constantly growing. The size of a single file is about 10K. Each file must be compressed on its own. The compression is done with the zlib library, which is used by the java.util.zip.Deflater class. When passing a dictionary to the Deflate algorithm using setDictionary , I can improve the compression ratio. Is there a way (algorithm) to find the 'optimal' dictionary, i.e. a dictionary with the overall optimal compression ratio? See zlib

How can I use deflated/gzipped content with an XHR onProgress function?

由 落花浮王杯 提交于 2019-11-27 00:26:42
问题 I've seen a bunch of similar questions to this get asked before, but I haven't found one that describes my current problem exactly, so here goes: I have a page which loads a large (between 0.5 and 10 MB) JSON document via AJAX so that the client-side code can process it. Once the file is loaded, I don't have any problems that I don't expect. However, it takes a long time to download, so I tried leveraging the XHR Progress API to render a progress bar to indicate to the user that the document

how to unpack resources.pak from google chrome?

由 眉间皱痕 提交于 2019-11-27 00:17:43
问题 There are bunch of interesting files accessible via chrome://resources/* using google chrome. On linux That the content is in /opt/google/chrome/resources.pak . I know I can get the whole sources from http://chromium.googlecode.com/svn/trunk/ but I would like to unpack the resource.pak file. file resources.pak reports just junk. Just to be clear, the question is NOT where to get those resources from . The question is what is the resources.pak file format and how to unpack it? 回答1: taken from

Node.js: Gzip compression?

由 随声附和 提交于 2019-11-27 00:11:23
Am I wrong in finding that Node.js does no gzip compression and there are no modules out there to perform gzip compression? How can anyone use a web server that has no compression? What am I missing here? Should I try to—gasp—port the algorithm to JavaScript for server-side use? Node v0.6.x has a stable zlib module in core now - there are some examples on how to use it server-side in the docs too. An example (taken from the docs): // server example // Running a gzip operation on every request is quite expensive. // It would be much more efficient to cache the compressed buffer. var zlib =

How to compress URL parameters

由 主宰稳场 提交于 2019-11-27 00:08:34
问题 Say I have a single-page application that uses a third party API for content. The app’s logic is in-browser only, and there is no backend I can write to. To allow deep-linking into the state of the app, I use pushState to keep track of a few variables that determine the state of the app (note that Ubersicht’s public version doesn’t do this yet). In this case repos , labels , milestones and username , show_open (bool) and with_comments (bool) and without_comments (bool). The URL format is

Why do real-world servers prefer gzip over deflate encoding?

由 我怕爱的太早我们不能终老 提交于 2019-11-27 00:02:50
问题 We already know deflate encoding is a winner over gzip with respect to speed of encoding, decoding and compression size. So why do no large sites (that I can find) send it (when I use a browser that accepts it)? Yahoo claims deflate is "less effective". Why? I maintain HTTP server software that prefers deflate, so I'd like to know if there's some really good reason not to continue doing so. 回答1: There is some confusion about the naming between the specifications and the HTTP: DEFLATE as

Most Efficient Multipage RequireJS and Almond setup

由 ≯℡__Kan透↙ 提交于 2019-11-26 23:54:31
问题 I have multiple pages on a site using RequireJS, and most pages have unique functionality. All of them share a host of common modules (jQuery, Backbone, and more); all of them have their own unique modules, as well. I'm wondering what is the best way to optimize this code using r.js. I see a number of alternatives suggested by different parts of RequireJS's and Almond's documentation and examples -- so I came up with the following list of possibilities I see, and I'm asking which one is most

Tool to Unminify / Decompress JavaScript [closed]

由 大憨熊 提交于 2019-11-26 23:34:08
问题 Are there any command line scripts and/or online tools that can reverse the effects of minification similar to how Tidy can clean up horrific HTML? (I'm specifically looking to unminify a minified JavaScript file, so variable renaming might still be an issue.) 回答1: You can use this : http://jsbeautifier.org/ But it depends on the minify method you are using, this one only formats the code, it doesn't change variable names, nor uncompress base62 encoding. edit: in fact it can unpack "packed"

Makefile to combine js files and make a compressed version

由 我们两清 提交于 2019-11-26 23:16:02
问题 I am trying to write a basic makefile that combines multiple js files into a single one and then does the same but compresses them. So far I have this one that can make the compressed version fine. # Set the source directory srcdir = src/ # Create the list of modules modules = ${srcdir}core.js\ ${srcdir}sizzle.js\ ${srcdir}json2.js\ ${srcdir}ajax.js\ ${srcdir}attribute.js\ ${srcdir}content.js\ ${srcdir}cookie.js\ ${srcdir}css.js\ ${srcdir}event.js\ ${srcdir}json.js\ ${srcdir}location.js\ $

Zlib-compatible compression streams?

由 天涯浪子 提交于 2019-11-26 23:14:37
问题 Are System.IO.Compression.GZipStream or System.IO.Compression.Deflate compatible with zlib compression? 回答1: From MSDN about System.IO.Compression.GZipStream: This class represents the gzip data format, which uses an industry standard algorithm for lossless file compression and decompression. From the zlib FAQ: The gz* functions in zlib on the other hand use the gzip format. So zlib and GZipStream should be interoperable, but only if you use the zlib functions for handling the gzip-format.
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