compression

Data compression on Android (other than java.util.zip ?)

由 ε祈祈猫儿з 提交于 2019-12-07 06:58:07
问题 I have a lot of data (text format) to send from a device. It obviously means that I should compress it. But my question is whether there are any ways of doing it other than by zip algorithm (like this). The reason I am asking this question is over here - for a text file i.e. 7-zip is twice (!) better than zip. Which is a significant gain. And maybe there are even better algorithms. So are there any effective ways of data compression (better than zip) available for Android? 回答1: You would need

How to validate that a file is a password protected ZIP file, using C#

由 懵懂的女人 提交于 2019-12-07 06:30:45
问题 Given a path to a file, how can I validate that the file is a password-protected zip file? i.e., how would I implement this function? bool IsPasswordProtectedZipFile(string pathToFile) I don't need to unzip the file -- I just need to verify that it's a ZIP and has been protected with some password. Thanks 回答1: Using SharpZipLib, the following code works. And by works I mean entry.IsCrypted returns true or false based on whether or not there is a password for the first entry in the zip file.

Which compression type should i choose in SharpZipLib?

由 本秂侑毒 提交于 2019-12-07 05:06:19
问题 I have a File Transfer Application that sends files and folders. (Server - client) I am trying to send data over TCP (sockets), I've made some rules for the way of transferring the data, so if it's sending a large folder that has many files, it should compress them into a single zip file first then when that zip file sent, the receiver has to decompress it. so I have decided to use SharpZibLib and I have got a question about it. Which type of compressing should i choose for my application? I

ASCII compressor works for short test file, not on long

由 不羁的心 提交于 2019-12-07 03:40:08
问题 The current project in Systems Programming is to come up with an ASCII compressor that removes the top zero bit and writes the contents to the file. In order to facilitate decompression, the original file size is written to file, then the compressed char bytes. There are two files to run tests on- one that is 63 bytes long, and the other is 5344213 bytes. My code below works as expected for the first test file, as it writes 56 bytes of compressed text plus 4 bytes of file header. However,

How to decompress an AES-256 Encrypted zip files?

由 被刻印的时光 ゝ 提交于 2019-12-07 03:33:54
问题 I am developing an android application which requires to decompress an AES-256 encrypted zip files, is there any libraries out there that I can use to accomplish that? I am greatly appreciative of any guidance or help. 回答1: zip4j , java library to handle Zip files (Open source, Apache License v2.0). http://www.lingala.net/zip4j/ Create, Add, Extract, Update, Remove files from a Zip file Read/Write password protected Zip files Supports AES 128/256 Encryption Supports Standard Zip Encryption

lightweight RESTful PHP server

由 ￣綄美尐妖づ 提交于 2019-12-07 02:17:31
I want to write an extremely lightweight PHP server which handles data requests from remote clients. The data returned is tabular (like that of data read from a CSV file or a database table). The "problem" is that I could be returning potentially several hundred thousand rows of data - with a column width of between 10 - 15 (depending on the type of data requested). In short, the data returned could be HUGE - and in an attempt to save bandwidth, and also increase the speed of transmission, I would like to compress the data (maybe optionally encrypt it whilst we are at it) before sending it

How do I compress a folder with the Python GZip module?

由 ￡可爱￡侵袭症＋ 提交于 2019-12-07 02:06:02
问题 I'm creating Python software that compresses files/folders... How would I create a section of the code that asks for the user input of the folder location and then compresses it. I currently have the code for a single file but not a folder full of files. Please explain in detail how to do this. 回答1: The code to compress a folder in to tar file is: import tarfile tar = tarfile.open("TarName.tar.gz", "w:gz") tar.add("folder/location", arcname="TarName") tar.close() It works for me. Hope that

Does SVN Compress the binary content?

由 删除回忆录丶 提交于 2019-12-07 01:18:05
问题 I was wondering whether SVN actually compresses the binary content on the server during Commits? I know that the binary store the diffgrams for comparison and versioning but wondered whether a new file commited would occupy the same volume on the server as it does on the client pc? 回答1: I believe so. From here: http://svn.apache.org/repos/asf/subversion/trunk/INSTALL * libz (REQUIRED for client and server) Subversion uses zlib for compressing binary differences. These diff streams are used

How to zip a file while writing to it?

由 北城以北 提交于 2019-12-07 00:49:58
问题 Does anyone know of a way to zip a stream that you are writing to? I'm trying to avoid writing the file to the disk, and was wondering if I can just compress data as you are writing it to the stream. The use case behind this is that the raw file is going to be very large and we want to avoid having to write the entire thing unzipped onto the disk. 回答1: I think you would be interested in ZipOutputStream. You can write to that stream, and then write it out to a zipped file. Also, check out this

Speeding up Websites via Simple Apache Settings in Htaccess [zlib.output_compression + mod_deflate] a Syntax

由 拥有回忆 提交于 2019-12-07 00:38:32
Imagine these two chunks of code residing in htaccess for speeding up the website. With php 5.2.3 on apache 2.0 block A # preserve bandwidth for PHP enabled servers <ifmodule mod_php4.c> php_value zlib.output_compression 16386 </ifmodule> block B # compress speficic filetypes <IfModule mod_deflate.c> <FilesMatch "\.(js|css|eot|ttf|svg|xml|ast|php)$"> SetOutputFilter DEFLATE </FilesMatch> </IfModule> Questions that arise: Q1. Is this the proper way to combine these two blocks A + B into 1 htaccess in the root? Q2. Is it correct that on the second block B, |php| is used again in the mod_edflate?
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