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Xdelta [3] is a command line tool for delta encoding, which stores or transmits the difference (deltas) between sequential data, instead of entire files.This is similar to diff and patch, except diff computes and shows the difference between two complete files, while patch is primarily designed for human-readable text files; Xdelta is designed for binary files and does not generate human ...
Free software implementations include xdelta (version 3) and open-vcdiff. Google's Shared Dictionary Compression Over HTTP proposal uses this algorithm, and was included in the Google Chrome browser, up to version 58. [2] xdelta - A tool, which is an Open Source VCDIFF delta compression implementation
A delta can be defined in 2 ways, symmetric delta and directed delta.A symmetric delta can be expressed as (,) = (),where and represent two versions.. A directed delta, also called a change, is a sequence of (elementary) change operations which, when applied to one version , yields another version (note the correspondence to transaction logs in databases).
An open file format is a file format for storing digital data, defined by a published specification usually maintained by a standards organization, and which can be used and implemented by anyone. For example, an open format can be implemented by both proprietary and free and open source software , using the typical software licenses used by each.
The computer tool patch is a Unix program that updates text files according to instructions contained in a separate file, called a patch file.The patch file (also called a patch for short) is a text file that consists of a list of differences and is produced by running the related diff program with the original and updated file as arguments.
Specifically, CVS (Concurrent Versions System) was developed on top of RCS structure, improving scalability of the tool for larger groups, and later PRCS, [8] a simpler CVS-like tool which also uses RCS-like files, but improves upon the delta compression by using Xdelta instead.
It also supports file comments (4DOS descript.ion). XnView can search files that have the same filename or data, and can search for similar graphics as well. The display of the histogram of a picture is possible. Scripts can be created to convert, manipulate and rename a batch of images in one go. Creation of advanced slide shows is also possible.
Google refers to delta updates as "smart updates." This has been implemented in Google's Android operating system devices that run on Android 2.3 or above. Google engineers have estimated that smart updates would be only about one third the size of a full update on average.