Zlib Gzip String

Try to gzip compress your buffers (including headers) or try to use the decompressBuffer function that works on zlib buffers. Zlib Functions. InflateRaw # Decompress a raw deflate stream. If this option is set to "On" in php. The ZLIB compression library was initially developed as part of the PNG graphics standard and is not protected by patents. Reading entries from an dump archive:. I haven't specifically tried. gzip method is no. The data format defined by this specification does not attempt to: Allow random access to compressed data;. During the compression stage, it is the encoder that chooses the amount of time spent looking for matching strings. zlib库压缩和解压字符串STL string的实例详解. See your system's zlib. NET projects, and I've never had trouble running it under Mono for Linux or OS X. This allows computing a running checksum over the concatenation. The snippet is the following: import pyodbc import zlib cn = pyodbc. The compression functionality in DeflateStream and GZipStream is exposed as a stream. The following are code examples for showing how to use gzip. You can vote up the examples you like or vote down the ones you don't like. ini or the Apache configuration, pages are compressed if the browser sends an "Accept-Encoding: gzip" or "deflate" header. This is an example C program illustrating compressing data using zlib. 02, IO::Zlib can also use an external gzip command. 1 connection, and I just cannot get it to work. If you intercept a SAML Message, you will turn it in plain-text through base64 decoding. The simplest way to work with zlib requires holding all of the data to be compressed or decompressed in memory. You are given a string. The packets are just JSON, so the first thing to try is to compress the data with gzip prior to sending it. How to compress a large string with gzip to a file? Hello, I was wondering what is the proper way to write data from in-memory to file and have it compressed along the way? The best I got is this. Search Google; About Google; Privacy; Terms. zlib gunzip string?-headerVar varName? Return the uncompressed contents of binary string string, which must have been in gzip format. HELP! Python 2. js comes with a variety of transform streams in the Core API: zlib - for gzip compressing and uncompressing; crypto - for encrypting, decrypting, and calculating message digests; Compressing stream with gzip. ZLIB_VERSION¶ The version string of the zlib library that was used for building the module. gzuncompress — Uncompress a compressed string; gzwrite — Binary-safe gz-file write; readgzfile — Output a gz-file; zlib_decode — Uncompress any raw/gzip/zlib encoded data; zlib_encode — Compress data with the specified encoding; zlib_get_coding_type — Returns the coding type used for output compression. I've got a string that I've retreieved im Base64 and when decoded it's a been inflated using zlib (see below). ZLIB_RUNTIME_VERSION¶ The version string of the zlib library actually loaded by the interpreter. If forceOverwrite flag is set to false and the output file exists this method will throw an error, if set to true the file will be overwriten. If -level is given, level gives the compression level to use (from 0, which is uncompressed, to 9, maximally compressed). The gzip data compression algorithm itself is based on zlib module. level-Compression level. 0 (and higher) with the Stream. Current version: 1. NONE,默认为最后一种,即不做任何压缩,定义方法如下:. zlib gzip string?-level level? ?-header dict? Return the compressed contents of binary string string in gzip format. Zlib Compression Functions Introduction This module enables you to transparently read and write gzip (. 7; C: Zlib compress not working; Compress in Java, decompress in Python? Java Decompress a string compressed with zlib deflate; ZLib in iPhone unable to decompress data; zlib fails to decompress gzip data; zlib: Differences Between the `deflate` and `compress` Functions. zlib库压缩和解压字符串STL string的实例详解. String: a sequence of arbitrary bytes. So as I found no method transforming a string into a byte[] and vice versa without involving encoding specifications, I ended up with a loop and a cast. The output data will be in the zlib format, which is different from the gzip or zip formats. 0 and later, FORCE_DEFLATE generates RFC 1950 compliant output, consisting of a zlib header, the deflated data, and an Adler checksum. Quote: Something like that and maybe a couple of examples would be what I would call good documentation. The only way to determine where a string of compressed data ends is by actually decompressing it. Contribute to mapbox/gzip-hpp development by creating an account on GitHub. gzip method is no. You can vote up the examples you like or vote down the ones you don't like. inflateRaw(buf, callback) # Decompress a raw Buffer. It is also a file format. Note that the manual states that the input parameter must be a string compressed with gzcompress(), so it is not guaranteed that it will compress ANY zlib compressed string. The zlib module can be used to implement support for the gzip and deflate content-encoding mechanisms defined by HTTP. NEWS: the source distribution of zlib DLL is now merged with the standard zlib. Time // modification time Name string // file name OS byte // operating system type} type Reader ¶ A Reader is an io. Both the zlib and gzip formats: use the same compressed data format internally, but have different headers: and trailers around the compressed data. Either ZLIB_ENCODING_RAW, ZLIB_ENCODING_DEFLATE or ZLIB_ENCODING_GZIP. The gzip data format uses the same algorithm as the DeflateStream class, but can be extended to use other compression formats. It was produced by the GNU Zip (gzip. md", "modules": [ { "textRaw": "Zlib", "name": "zlib", "introduced_in": "v0. options ; Creates and returns a new DeflateRaw object. The data format defined by this specification does not attempt to: Allow random access to compressed data;. How to compress a large string with gzip to a file? Hello, I was wondering what is the proper way to write data from in-memory to file and have it compressed along the way? The best I got is this. Hello, I have data in a 'string' variable. c: replace with substring. path:TFRecord文件的存放路径; option:TFRecordOptions对象,定义TFRecord文件保存的压缩格式; 有三种文件压缩格式可选,分别为TFRecordCompressionType. This program is free software; you can redistribute it and/or modify it under the terms of the PHP License as published by the PHP Group and included in the distribution in the file: LICENSE. Java gzip compress/decompress string. Not surprisingly, the compression algorithm used in zlib is essentially the same as that in gzip and Zip, namely, the `deflate' method that originated in PKWARE's PKZIP 2. js restored the original behavior of upgrading a value of 8 to 9, since passing windowBits = 9 to zlib actually results in a compressed stream that effectively uses an 8-bit window only. NET Framework's System. If possible, I would like to use zlib. deflate_add — Incrementally deflate data; deflate_init — Initialize an incremental deflate context; gzclose — Close an open gz-file pointer; gzcompress — Compress a string; gzdecode — Decodes a gzip compressed string; gzdeflate — Deflate a string; gzencode — Create a gzip compressed string; gzeof — Test for EOF. gz) format with an interface similar to that of IO. txt compressed. 在stackoverflow问了没人鸟我。。。 How to use zlib gzip a string in nodejs? The result is difference between using GZIPOutputStream in java and using zlib. GZIP/ZLIB formats Open standard; no licenses needed Combines LZ77 and Huffman algorithms: LZ77: Replaces duplicate strings with (distance, length) pairs. The string of literals comes after the token and any extra bytes needed to indicate string length. gzip and Zlib. 18-rc5 allows local users to cause a denial of service (crash) via an SCTP socket with a certain SO_LINGER value, possibly related to the patch for CVE-2006-3745. There have been no technical changes to the deflate format since version 1. Задача получить разжатую строку в php. I would like to use gzip from C++ (or C) to gzip a string. ZLIB、TFRecordCompressionType. ini or the Apache configuration, pages are compressed if the browser sends an "Accept-Encoding: gzip" or "deflate" header. The FreeVBCode site provides free Visual Basic code, examples, snippets, and articles on a variety of other topics as well. String: a sequence of arbitrary bytes. gz" and prints its contents out, uncompressed. zlib是一个比较通用的压缩库,通过在程序中引入zlib,可以方便的对数据进行压缩。今天花了点时间研究了一下,在tbuldr. htaccess directive to enable gzip compression: #Gzip php_flag zlib. GzipFile exists, but that's for file objects - what about with plain strings?. But that's not all, zlib has the option to use a GZIP wrapper on the compressed data or a lighter zlib wrapper. function stream = zlib. 3 only dump archives using the new-fs format - this is the most common variant - are supported. Open and read a gzip compressed file with zlib in C This is an example of opening a file compressed with gzip for reading in C. Who knows libraries for decompress gzip and zlib string in javascript ? I try zlib but it doesn't work for me. deflateRaw(buf, callback) # Compress a string with DeflateRaw. gz file format is not an archive format (i. NEWS: the source distribution of zlib DLL is now merged with the standard zlib. I just extracted the sentence relevant to the gzip headers from the zlib manual which contains all this information. x, the gzopen interface has been completely rewritten to use the IO::Compress::Gzip for writing gzip files and IO::Uncompress::Gunzip for reading gzip files. The compression functionality in DeflateStream and GZipStream is exposed as a stream. NONE,默认为最后一种,即不做任何压缩,定义方法如下:. I highly recommend using virtualenv for a local install of Python that has the same minor version as the one that comes with Ubuntu (2. gz', 'rb') cdata = fh. zlib on the other hand use the gzip format. The extension library to use zlib from Ruby. File footer. Using built-in Node. Gzip and bzip2 are functionally equivalent. fAllowEmptyData = (1<<1), /// Check (and skip) gzip file header on decompression stage fCheckFileHeader = (1<<2), /// Use gzip (. I stumbled upon two C++ functions by Timo Bingmann: string : compress_string(string) string : decompress_string(string) Renamed these and created two gzip versions from them: string : compress_deflate(string). The string of literals comes after the token and any extra bytes needed to indicate string length. String Compress in C# and Decompress in Javascript String Compress in C# and Decompress in Javascript. deflate_add — Incrementally deflate data; deflate_init — Initialize an incremental deflate context; gzclose — Close an open gz-file pointer; gzcompress — Compress a string; gzdecode — Decodes a gzip compressed string; gzdeflate — Deflate a string; gzencode — Create a gzip compressed string; gzeof — Test for EOF. output_compression boolean/integer. 1 and bzip2-1. String GZIP. This documents present CGZip, C++ class wrapper for the gzip methods, which are included in the zlib library. 32-042stab140. The deflate method encodes the input data into compressed data. It contains a single file. DEFLATE uses a combination of the LZ77 algorithm and Huffman coding. js comes with a variety of transform streams in the Core API: zlib - for gzip compressing and uncompressing; crypto - for encrypting, decrypting, and calculating message digests; Compressing stream with gzip. zlib is slower and needs more memory, though. An upgrade of zlib from 1. js zlib for beginners and professionals with examples on first application, repl terminal, package manager, callback concept, event loop, buffers, streams, file systems, global objects, web modules and more. ZLIB_RUNTIME_VERSION¶ The version string of the zlib library actually loaded by the interpreter. gz) compressed files, through versions of most of the filesystem functions which work with gzip-compressed files (and uncompressed files, too, but not with sockets). Compress the given string. When I learned that I would have to use zlib to compress and uncompress, I Googled it for a few minutes and then quickly wrote a program to gzip a file and then ungzip it. 3) - zlib-compressed file depacking library in Lua. This is the snippet Compress and Decompress Strings on FreeVBCode. gunzip(buf[, options], callback) zlib. 10 (2 Jan 2017) - Avoid warnings on snprintf() return value - Fix bug in deflate_stored() for zero-length input - Fix bug in gzwrite. Execute zlib_decode Online. Decompress: Here the GZipStream object is first instantiated. If -level is given, level gives the compression level to use (from 0, which is uncompressed, to 9, maximally compressed). js Zlib Module Built-in Modules. VBZLib - GZip Compress/Uncompress In Memory using Modified ZLib DLL this because I couldn't find any other sample code to uncompress a string containing gzip data. The zlib library can be found on virtually every computer. This small C++ code snippet features a pair of functions which use this ubiquitous library to compress ordinary STL strings. Must be equal to zlib::default_compression or a value in the range 0-9. Replace these consecutive occurrences of the character ' ' with in the string. (please note it's not a file) I want to compress with zlib compression level 9, and get back the result. zlib would automatically set windowBits to 9 if was initially set to 8. inflate() will then process raw deflate data, not looking for a. Do you think we are missing an alternative of ZLib or a related. 3, and earlier, when decompressing a gzipped file, allows local users to modify permissions of arbitrary files via a hard link attack on a file while it is being decompressed, whose permissions are changed by gzip after the decompression is complete. ) If value is present, it is used as the starting value of the checksum; otherwise, a fixed default value is used. level is an integer from 0 to 9 controlling the level of compression; 1 is fastest and produces the least compression, 9 is slowest and produces the most. (There once was a bzip, but it seems to have completely vanished off the face of the world. Enter your text: Tell Your Friends If you like and use these tools, please tell your friends using the social links at the top of the page. gunzipSync(buf[, options]) Decompress a raw Buffer with Gunzip. The FILE_GUNZIP routine uncompresses a given GZIP input file or files, and saves the uncompressed data into a new file or to memory. Note: This is not the same as gzip compression, which includes some. DeflateRaw # Compress data using deflate, and do not append a zlib header. lz-string was designed to fulfill the need of storing large amounts of data in localStorage, specifically on mobile devices. gz" and prints its contents out, uncompressed. Input Format. compress A format using the Lempel-Ziv-Welch (LZW) algorithm. You can vote up the examples you like or vote down the ones you don't like. So as I found no method transforming a string into a byte[] and vice versa without involving encoding specifications, I ended up with a loop and a cast. A random string of characters doesn't exhibit much in the way of patterns the way that real data does. The compression functionality of zlib was produced by Jean-loup Gailly and the decompression components were written by Mark Adler. Prior to PHP 5. 00: Encryption strength for 7z archives was increased. if None, return generated bytes. The compression algorithm used in zlib is the deflate method. Задача получить разжатую строку в php. Mercurial crVCL / file revision. This is just one of many things I need to get on here but I think I need to first start off with this. zlib gzip string?-level level? ?-header dict? Return the compressed contents of binary string string in gzip format. By using fbinread you can also zip individual files. The zlib compressed data format is described in RFC 1950, which is a wrapper around a deflate stream which is described in RFC 1951. This simple online text compression tool is compressing a plain text and decompressing compressed base64 string with gzip, bzip2 and deflate algorithms. the code as below:. It causes memory problems and even opens up DoS attacks. gzip and Zlib. compression) Returns: None or bytes. DeflateRaw # Compress data using deflate, and do not append a zlib header. The zlib format was designed to be compact and fast for use in memory and on communications channels. Passing a string to ini_set (other than the string '1') causes a third, undocumented behavior: zlib. I'm trying to get it working with mod_python, but the same thing happens with CGI, so I've reproduced it with a CGI script, to simplify the problem. The algorithm used for the compress utility dates back from work done in the 1980s. Gzip Compress/Decompress. It supports the "zlib", "gzip" and "raw" compression formats. js Zlib Module Built-in Modules. The library does not install any signal handler. zlib deflate string?level? Returns the raw compressed binary data of the binary string in string. The data to compress. gzuncompress — Uncompress a compressed string; gzwrite — Binary-safe gz-file write; readgzfile — Output a gz-file; zlib_decode — Uncompress any raw/gzip/zlib encoded data; zlib_encode — Compress data with the specified encoding; zlib_get_coding_type — Returns the coding type used for output compression. zlib decompress node js (3) I want to get compress layer data from tmx file. x), I'm quite new myself and had a lot of issues attempting to install packages to a local version without it, whereas with it you can simply create and activate a new environment and install to your hearts content without changing the global package list. The gzip format was designed for single- file compression on file systems, has a larger header than zlib to maintain directory information, and uses a different, slower check method than zlib. compress(str) (Yes, yes, this is not gzip compression. GZipStream example. decompress(c) b'hello python' The module consists of definitions of has two corresponding classes of compression and decompression objects. close() To decompress a gzip format file with zlib, call inflateInit2 with the windowBits parameter as 16+MAX_WBITS , like this:. output_compression boolean/integer. You can vote up the examples you like or vote down the ones you don't like. In this case, -windowBits determines the window size. This routine is written in the IDL language. Search Google; About Google; Privacy; Terms. If you ever need to unzip data compressed with zlib without a header (e. The level provides a speed vs. 02, IO::Zlib can also use an external gzip command. Compress and Decompress with ZLib Library - posted in Pascal and Delphi Tutorials: Overview Sometimes we need to compress our data, either to reduce network traffic when transmitting or just to save space in storage media. Header checksum. The zlib/gzip reference implementation allows the user to select from a sliding scale of likely resulting compression-level vs. htaccess directive to enable gzip compression: #Gzip php_flag zlib. If string is nil, this method finishes the stream, just like Zlib::ZStream#finish. c that produced corrupt gzip files - Remove files to be installed. Standard library documentation for gzip; zlib - The zlib module is a lower-level interface to gzip compression. Brotli is a compression algorithm originally developed by Google, and offers compression superior to gzip. This may be different from the zlib library actually used at runtime, which is available as ZLIB_RUNTIME_VERSION. The version string of the zlib library that was used for building the module. 0 is no compression. Describes how to interact with sequential files (disk files) on Windows or UNIX systems, including using the ObjectScript OPEN command to create a new file, overwrite or append to an existing file, and define the file access type and record format. Optionally specify a windowBits argument that is passed to inflateInit2(), see zlib. kind defaults to zlib. documentation. Creates an instance of Zlib::Inflate for the gzip format, yields it to the given block, and closes it at its end. output_compression on AddOutputFilterByType DEFLATE text/text text/html. Instances of this class wrap another IO object. It supports the "zlib", "gzip" and "raw" compression formats. gunzipSync(buf[, options]) Decompress a raw Buffer with Gunzip. md", "modules": [ { "textRaw": "Zlib", "name": "zlib", "introduced_in": "v0. compress A format using the Lempel-Ziv-Welch (LZW) algorithm. output_compression boolean / integer. level is an integer from 0 to 9 controlling the level of compression; 1 is fastest and produces the least compression, 9 is slowest and produces the most. 11 changed behavior when windowBits is set to 8 for raw deflate streams. gz file format is not an archive format (i. If you ever need to unzip data compressed with zlib without a header (e. The zlib module is a little bit quirky, and the zlib. inflate() will then process raw deflate data, not looking for a. Hello Kpeluso, Thank you for getting in touch with us. GZIP is one of the favorite tool to compress file in Unix systems. 刷新 # 中英对照 提交修改. To decode / uncompress the received HTTP POST data in PHP code, request data coming from Java / Android application via HTTP POST GZIP / DEFLATE compressed format 1) Data sent from Java Android app to PHP using DeflaterOutputStream java class and received in PHP as shown below. Compress a string with Deflate. lz-string was designed to fulfill the need of storing large amounts of data in localStorage, specifically on mobile devices. How do I gzip compress a string in Python? gzip. Either argument may be a single string or a list of strings. Zlib Functions. close # this is necessary! # z was closed to write the gzip footer, so # now we need a new StringIO: StringIO. Ex , layer data in tmx file is :. decompress(string [, wbits [, bufsize]])¶ Decompresses the data in string, returning a string containing the uncompressed data. String: a sequence of arbitrary bytes. The zlib format was designed to be compact and fast for use in memory and on communications channels. 1 #1 SMP Thu Aug 15 13:32:22 MSK 2019 x86_64 : Build Date : Oct 21 2019 17:23:41 : Configure Command. Current version: 1. for example: INSERT INTO dummyTable(id, col1) VALUES (1, COMPRESS('This is a long string')); will insert the string zlib compressed, and you can retrieve it with: SELECT id, UNCOMPRESS(col1) FROM dummyTable; I use this method and it saves me from extra coding. path:TFRecord文件的存放路径; option:TFRecordOptions对象,定义TFRecord文件保存的压缩格式; 有三种文件压缩格式可选,分别为TFRecordCompressionType. The format can be readily implemented in a manner not covered by patents. GZipStream is an implementation of IO and can be used virtually anywhere IO is used. The string of literals comes after the token and any extra bytes needed to indicate string length. In addition, using the TZCompressionStream and TZDecompressionStream classes you can also create (compress) and decompress ZIP files. The compression algorithm. These two algorithms form the basis for many variations including LZW, LZSS, LZMA and others. If present, level gives the compression level to use (from 0, which is uncompressed, to 9, maximally compressed). gzuncompress — Uncompress a compressed string; gzwrite — Binary-safe gz-file write; readgzfile — Output a gz-file; zlib_decode — Uncompress any raw/gzip/zlib encoded data; zlib_encode — Compress data with the specified encoding; zlib_get_coding_type — Returns the coding type used for output compression. 32-042stab140. The gzip data compression algorithm itself is based on zlib module. ) Other common compression formats are zip, rar and 7z; these three do both compression and archiving (packing multiple files into one). The program compresses a short piece of text in message variable and prints the compressed message to stdout. 3 only dump archives using the new-fs format - this is the most common variant - are supported. Decompress: Here the GZipStream object is first instantiated. decompress(string [, wbits [, bufsize]])¶ Decompresses the data in string, returning a string containing the uncompressed data. (There once was a bzip, but it seems to have completely vanished off the face of the world. gzip and Zlib. For gzip data with gzip header you can use gzip module directly; but please remember that under the hood, gzip uses zlib. gz (GZip) file. gzip is a gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. 这里,zlib只是把一段内存压缩,压缩后放的另一段内存上,这离压缩文件甚至文件夹的目标还很远。 确切的说,zlib可能并不是一个针对ZIP文件的库,它只是一个针对gzip以及deflate算法的库。它提供了一个叫做minizip (contrib\minizip) 例子来给出操作 ZIP 文件的方法。. You can also unzip zip archives that contain multiple files. Once a file is compressed using Compress, you can restore the file to its original state with the uncompress utility. decompress(c) b'hello python'. Gzip format files (created with the gzip program, for example) use the "deflate" compression algorithm, which is the same compression algorithm as what zlib uses. The only way to determine where a string of compressed data ends is by actually decompressing it. GZIP/ZLIB formats Open standard; no licenses needed Combines LZ77 and Huffman algorithms: LZ77: Replaces duplicate strings with (distance, length) pairs. A convenient wrapper for the zlib standard library that allows compression/decompression of strings with gzip. Requires a signed-in GitHub account. Line breaks should be denoted by a single line feed character. js transform streams. So, I think it. deflate([ int compression_level ], [ int window_size ]) If no compression_level is provided uses Z_DEFAULT_COMPRESSION (6), compression level is a. Ruby/zlib also provides the features for accessing gzipped files. Gzip header-only C++ library. A few years ago I posted about poor compression ratios from the. If you ever need to unzip data compressed with zlib without a header (e. DEFLATE uses a combination of the LZ77 algorithm and Huffman coding. deflate_add — Incrementally deflate data; deflate_init — Initialize an incremental deflate context; gzclose — Close an open gz-file pointer; gzcompress — Compress a string; gzdecode — Decodes a gzip compressed string; gzdeflate — Deflate a string; gzencode — Create a gzip compressed string; gzeof — Test for EOF. txt: ASCII text, with very long lines since gzip uses a magic header that 'file' knows about. So as I found no method transforming a string into a byte[] and vice versa without involving encoding specifications, I ended up with a loop and a cast. summary | shortlog | changelog | shortlog | changelog. The only way to determine where a string of compressed data ends is by actually decompressing it. LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 and 1978. gz file format is a compressed file format. The zlib format was designed to be compact and fast for use in memory and on communications channels. js comes with a variety of transform streams in the Core API: zlib - for gzip compressing and uncompressing; crypto - for encrypting, decrypting, and calculating message digests; Compressing stream with gzip. The format can be readily implemented in a manner not covered by patents. (There once was a bzip, but it seems to have completely vanished off the face of the world. The HTTP Accept-Encoding header is used within an http request to identify the compression encodings accepted by the client. I'm trying to get it working with mod_python, but the same thing happens with CGI, so I've reproduced it with a CGI script, to simplify the problem. It is fully described in the specifications at the java. And even if the header was stripped, such files are 8-bit and yours is ASCII. These are the top rated real world C# (CSharp) examples of Ionic. gzip(buf, callback) # Compress a string with Gzip. GNU Zip (or gzip for short) is a stream compression program (like the UNIX compress program), and not an archiver (like the DOS pkzip program) that uses an unpatented (and unpatentable) algorithm for its compression. This small C++ code snippet features a pair of functions which use this ubiquitous library to compress ordinary STL strings. Uncompress restores attributes of a compressed file. gunzipSync(buf[, options]) Decompress a raw Buffer with Gunzip. Passing a string to ini_set (other than the string '1') causes a third, undocumented behavior: zlib. Deflate a Gzip string. 1 of this specification. OK, I Understand. h for further information about zlib. Next to that it will also give you some additional information like the size of the original version of the web page you tested and how much you (may) benefit from using. Gzip Compress/Decompress. The compression functionality of zlib was produced by Jean-loup Gailly and the decompression components were written by Mark Adler. This function compresses the given string using the DEFLATE data format. It provides many of the same methods as the IO::Handle interface. Ex , layer data in tmx file is :. In Compress::Zlib version 2. zip package description. See gzip_used. zlib is slower and needs more memory, though. compress(str) (Yes, yes, this is not gzip compression. Input Format. My case was do decompress email messages that are stored in Bullhorn database. Mark and Jean-loup can be reached by e-mail at. Overview ZLIB is a lossless data compression method and software library by Jean-loup Gailly and Mark Adler initially released in 1995 and became “de-facto” standard of lossless data compression. The library does not install any signal handler.