Best compression algorithm

Best compression algorithm. 5: Other Transformation Formats. Now, I use the BCJ filter in Xz Utils to increase the elf file compression ratio by %5. Reply reply. Jun 6, 2018 · 23. Nov 13, 2017 · must be loseless. 7z format). Oct 3, 2008 · 1. Much, much faster algorithms, such as LZO and lz4 should be considered. A All Answers (3) Ira Chayut. Few operating systems ship with built Even for uncompressible data it does not hurt the speeds. To be a bit more specific: An archive format aggregates multiple files and/or directories, usually including metadata such as ownership, timestamps, and possibly other data, into a single file. 8 Best-fit curve-fitting Data compression using curve-fitting (best functional form: linear, quadratic, etc. Compression algorithm. How do you define algorithm? Auto encoders compress very well but the model itself is the algorithm. Computers can compress text in a similar way, by finding repeated sequences and replacing them with shorter representations. Flate (zlib) is a decent general compression algo, but for images it should always be beat by DCT (jpeg) and CCITTFax in a PDF file. Tunable with compression levels ranging from negative 5 (fastest)[5] to 22 (slowest in compression speed, but best compression ratio). It has been under development since either 1996 or 1998 by Igor Pavlov [1] and was first used in the 7z format of the 7-Zip archiver. Our proposed algorithm DNABIT compress performs better than the best algorithms GENCOMPRESS and DNA PACK whose compression ratio is approximately 1. Agree, largely. However, Zstandard, at the default setting, shows substantial improvements in both compression speed and decompression speed, while compressing at the same ratio as zlib. deflate is also the compression method used in gzip and by zlib, as well as by The Lempel–Ziv–Markov chain algorithm ( LZMA) is an algorithm used to perform lossless data compression. tar. must be supported in browser via JavaScript libs or natively. Support for the format must be enabled by using a feature flag. With level 1 compression, lz4 is the clear winner in terms of pure speed, at 0. LZW is the foremost technique for general-purpose data compression due to its simplicity and versatility. First, a minor aside about terminology: ZIP is the only archive format you used. Squash Compression Benchmark. 2% of the original size and 14. ZFS enables different compression parameters for this algorithm. Techniques. 7k 7 64 86. We would like to show you a description here but the site won’t allow us. But I want to do more. Type. 04 using level 1 compression. Speed can be tuned dynamically, selecting an "acceleration" factor which trades compression Lossless bit compression. – Anton Tykhyy. LZW compression. PPMd Dmitry Shkarin's PPMdH algorithm with small changes. In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. facebook . It reports times and compression ratios for 100s of compression algorithms over many databases. For 8-bit TIFF files, both LZW and ZIP offer similar compression. Aug 14, 2018 · Audio Compression. Share. ) which, unlike Uncompressed PCM, don't support as wide of a frequency range (a smaller range of possible values ignores sounds outside of the necessary spectrum and requires Best compression algorithms are content aware algorithms. BWT is extremely slow compared to the memory speeds quoted in the original question. bzip2 offers much faster compression than xz but xz decompresses a lot faster than bzip2. For 16-bit TIFF files, ZIP is recommended as LZW can increase file size. character at a time. Mar 9, 2016 · It is interesting to note a few records generated from all of these tests. gzip-1 provides the fastest gzip compression. "zip" in this context is a file format that permits several different compression methods. Step 1: Quantization. The idea is to assign variable-length codes to input characters, lengths of the assigned codes are based on the frequencies of corresponding characters. It creates Jul 27, 2021 · JPEG XL supports both lossless and lossy compression. The algorithm for LZW compression is as follows: set w = NIL loop read a character K if wK exists in the dictionary w = wK else output the code for w add wK to the string table w = K endloop. bmp files where RAR uses specialized routines that outperform LZMA. It was written by Igor Pavlov, who also designed the LZMA algorithm that forms the default compression mode. Apr 22, 2020 · TimescaleDB is an open-source time-series database, engineered on PostgreSQL, that employs all of these best-in-class compression algorithms to enable much greater storage efficiency for our users (over 90% efficiency, as mentioned earlier). Mar 18, 2024 · Compression. Step 2: Transform coding. I highly recommend Deflate (used by zlib and Zip) for a number of reasons. After observing the simulated results, we found that PPMonstr provides the best compression ratio. Huffman compression. Let's try it with this quote from William Shakespeare: Aug 23, 2021 · Zstandard (ZSTD) is a fast, lossless compression algorithm. The Compression is just an opportunistic way of encoding things, and when asking for "the best compression ratio that can be achievable by lossless data compression", you need to be more specific about the context of the compression: the compression ratio is the ratio between the size of the compression and the size of a "raw" encoding, but the another and one would want to pick your algorithm appropriately. JPEG XL is supported in Chrome and Firefox, but it’s not enabled by default. Among all the methods tried, the lowest compression ratio was LZ4 with a 4KB block size, providing a 1. The following algorithms are lossless: CCITT group 3 & 4 compression. The following compression algorithms are available: gzip - standard UNIX compression. Version 1 of this implementation was released as free software on 31 August 2016. frequently encountered) data will produce shorter output than "improbable" data. Whenever finding This could be a valid problem and a good class project, but I think you need to formulate your question and methodology a little more to get there. The LZW can be considered as the best algorithm for text compression by considering the compression ratio, compression time and decompression time of all compression algorithms. Apr 16, 2023 · It is well known that in general encrypted data cannot be compressed. Lempel-Ziv, commonly referred to as LZ77/LZ78 depending on the variant, is one of the oldest, most simplistic, and widespread compression algorithms out there. The combination of these algorithms is based on many variations including LZW , LZSS , LZMA and others. gzip-N - selects a specific gzip level. bzip2 is a free and open-source compression tool for Linux. The answer depends on what you mean by "best audio compression algorithm. In some ways compression is responsible for the very existence of the Portable Network Graphics format (recall Chapter 1, "An Introduction to PNG"), and it is undoubtedly one of the most important components of PNG. CesarB. 8 for lz4 and 3. bzip2. Oct 25, 2010 · The best compression algorithm definitely depends of the kind of data you are dealing with. compression method 1, length 1 byte. What @Asaph says. Another example of lossy compressing a white and black image is: 2D Haar Transform. This warrants that in part 2 I examine this algorithm a bit closer. Oct 29, 2023 · 5. compression method 0, length 2 bytes. Transparency: 8-bit alpha channel is useful for graphical images. Some of the most common and popular algorithms are ZIP, JPEG, MP3, GZIP, and LZ4. codec: default instructs Elasticsearch to use blocks of 16kB compressed with LZ4, while index. For a fairer comparison, I have also included Eric Biggers’ libdeflate utility. NET 5, developers have access to the System. 360 MB/s. Computers represent all data in binary, so all types of files, from text to images to videos, are ultimately sequences of bits. Google Classroom. Obviously neither of these are good options So the more reasonable suggestions are LZMA2 or Gzip. 2: Run Length Encoding (RLE) is applied on the data. DotNetCompression is a real-time compression library in C# that provides ultra fast LZF4 streams, faster-than-native DEFLATE/ZLIB/GZIP streams and LZMA/BZIP2 streams for maximum compression. The xz compression utilities leverage a compression algorithm known as LZMA2. NET Data Compression Algorithms. It is useful on the web, where zlib decompression is widely implemented. [8] Feb 16, 2024 · Great for huge files. 3 seconds while gzip took 8. The Squash library is an abstraction layer for compression algorithms, making it trivial to switch between them or write a benchmark which tries them all, which is what you see here! The Squash Compression Benchmark currently consists of 28 datasets, each of which is tested against 29 plugins containing 46 There is a W3 (not-yet-released) standard named EXI (Efficient XML Interchange). Goals: to compress dense array of 8 million double-precision floats. Compression namespace, which has two compression algorithms: GZip and Brotli. Our DNABIT compress algorithm’s compression ratio is as less as 1. 7-Zip (LZMA algorithm) compresses very well and is available for under the LGPL. Here are five of the top trends in data compression: 1. 1. (Ida Mengyi Pu, 2006) It is used to determine how much the size of the original file has been reduced after compression. To add to @CesarB answer, one can then compress sequence of repeated numbers e. zstd. It comes out ahead of zstd which stresses once more the importance of using good software! gzip. The compression ratio of the resulting compression scheme heavily relies on the first problem: the model capacity. But I would suggest CCITTFax/Group3Fax compression, as a good Jan 5, 2024 · When selecting a data compression algorithm, you can consider multiple factors. Improve this answer. It was developed by Tsachy Weissman, a professor at Stanford University, and Vinith Misra, a graduate student, at the request of producers for HBO's television series Silicon Valley, a television show about a fictional tech start-up working on a data compression algorithm. It is the basis of many PC utilities that claim to “double the Mar 5, 2011 · 7zip. Dec 30, 2020 · We also used the time and nice Linux commands to help us measure time elapsed and increase CPU priority for the compression process, respectively. Released in 1999, 7zip (aka 7z or 7za) is a relative newcomer to compression. Feb 22, 2017 · 1: The input file is traversed from the beginning, reading a single. NET. must have very high compression ratio. The Deflate Compression Algorithm. The opposite would be a lossy compression algorithm. Java provides a variety of classes and methods for compressing and decompressing data with different algorithms, such as ZIP, GZIP, Deflate, JAR, BZIP2, LZMA, JPEG, PNG, MP3 Compressing ZFS File Systems. An important component of these two compression algorithms is string deduplication. Aug 4, 2018 · 1. gz game-directory. Compression is the process where data is stored using less disk space. bzip2), but is still not fast enough to meet the needs outlined here. xz is the fastest decompressing well-compressed algorithm. The most size efficient formats are xz and lzma, both with the -e parameter passed. It was true when our hard drives were tiny, and the advent of the internet has just made it more critical. 7 for gzip. [7] Other free compression software such as NanoZip and FreeArc usually outperform WinRAR. Sep 11, 2017 · H (x) = -Sigma_ {i=1}^ {N} P (x_i) log_2 P (x_i) The theoretical best is achieved by arithmetical coding, but other encodings can come close by chance. wav and . To compress JPEG XL files, I used the official cjxl tool, version 0. Compression ratio is a measure of the effectiveness of a compression algorithm (Ida Mengyi Pu, 2006) , which is calculated as the ratio of the output to the input file size of a compression algorithm. shouldn't be fast. Values are normally distributed. codec: best_compression instructs Elasticsearch to use blocks of 60kB compressed with DEFLATE. The following benchmarks are from compressing and decompressing a 619MB tarball containing Ubuntu 20. If you use LZMA2 with more than 2 threads, 7-zip splits data to chunks and compresses these chunks independently (2 threads per each chunk). The most frequently used compression formats used in live voice audio (like VoIP telephony) are μ-Law (mu-Law/u-Law is used in the US) and a-Law (used in Europe, etc. e. Compression is so closely interrelated with intelligence, you might find it difficult to tease Jan 22, 2011 · The time taken to compress is approximately in seconds. File compression plays a big part in connecting us, letting us send less data down the line so we can have faster downloads . For 8-bit TIFFs, both ZIP and LZW are suitable. gzip (Eric Biggers) 424 MB/s. Image files can take up a lot of space, so computers employ a range of algorithms to compress image files. The compression ratio is 2. The Weissman score is a performance metric for lossless compression applications. Data compression. 1 second. Both of them are theoretically dictionary coders. Recent advances in deep learning allow us to optimize probabilistic models of complex high-dimensional data efficiently. Mar 15, 2023 · It is the algorithm of the widely used Unix file compression utility compress and is used in the GIF image format. IO. So even without compression, we remove nearly two-thirds of the original data. 2% with gzip. – Mark Adler. Use compression for smaller file sizes without quality degradation. 7zip LZMA has the best usable compression for most data types, and fairly wide support now (eg Total Commander can unpack it with a plugin). Jan 2, 2016 · 1 Answer. 44. In later, first few digit (s) says length of actual digit followed by number of repetitions. A sample run of LZW over a (highly redundant) input string can be seen in the diagram above. The highest ration was LZMA with a 256K block size, providing a maximum compression ratio of 10. I am a bit surprised that this first round has a clear winner: ZSTD. Nov 18, 2020 · Elasticsearch offers two options for compression: index. Zstandard was designed to give a compression ratio comparable to that of the DEFLATE algorithm (developed in 1991 and used in the original ZIP and gzip programs), but faster, especially for decompression. Sep 19, 2019 · developing a scalable compression algorithm that exploits this model’s theoretical compression potential. It can handle pretty much any compressed file format you care to throw at it. Jan 11, 2020 · The fastest algorithm, lz4, results in lower compression ratios; xz, which has the highest compression ratio, suffers from a slow compression speed. Jun 20, 2013 · I would first remove the decimal point since it appears that all of your numbers can be described with two digits after the decimal point. 008 seconds per megabyte compressed, while gzip is the slowest at 0. Lossy algorithms achieve better compression ratios by selectively getting rid of some of the information in the file. Software engineers have always developed new ways of fitting a lot of data into a small space. Dec 4, 2010 at 15:17. Aug 31, 2016 · Some algorithms and implementations commonly used today are zlib, lz4, and xz. In addition to this, ZSTD now has a number of features that make a lot of real-world scenarios that have previously been We compare these algorithms on the basis of their compression ratio, compression speed and decompression speed. FileOptimizer is a compression optimizer : it recompress files with other options in order to reduce the size of the files. During compression, the LZ77 maintains a sliding window. Being optimized for XML, it compresses XML more ways more efficient than any conventional compression algorithm. Following LZ7x algorithm is the LZMA algorithm which offers (usually) better compression than LZ7x algortihms. Lempel-Ziv-Markov chain algorithm (LZMA): LZMA is a lossless data compression algorithm that provides high compression ratios, leading to improved performance and efficiency. ) can be effective when the data is amenable to some level of prediction. bzip2 is the best compromise between being enjoying a relatively broad install base and a rather good compression ratio, but requires a separate archiver. Oct 17, 2023 · Images with less detail and fewer tones compress more. The decompression rate also seems to be faster. Arithmetic coding can allocate less than one bit per symbol, where as Huffman, or Golomb coding need at least one bit per symbol (or symbol group). Files are usable as they are. When using . 5 Compression in Java. BSD-3-Clause or GPL-2. BZip2 Sep 14, 2023 · Lossy compression: The lossy compression is based on VP8 key frame encoding. More video technology guides and articles: Jan 4, 2009 · What is the best compression algorithm with the following features: should take less time to decompress (can take reasonably more time compress) should be able to compress sorted data (approx list of 3,000,000 strings/integers ) Please suggest along with metrics: compression ratio, algorithmic complexity for compression and decompression (if Dec 4, 2010 at 15:15. We can reduce the size of a given file For best compression ratio with LZMA2 use 1 or 2 CPU threads. The PNG specification defines a single compression method, the deflate algorithm, for all image May 7, 2011 · Back then i thought that this concept could be the key to the most efficient compression algorithm ever. (primary use-case) May 20, 2019 · 6. The algorithm includes redundancy checks for detecting data corruption. Introduction to Data Compression. 175 MB/s. 58 bits/base. In practice however, you will almost always see deflate used exclusively in zip files, for compatibility. 7_1. If this is a 'real-time' compression, I would recommend investigating a lower-level Brotli or Zstandard compressor (the high level ones take a lot CPU - but do give very good compression). Sep 28, 2021 · . g. 3. Does anyone know if there is a compression algorithm with a Oct 25, 2008 · Where compatibility is a concern, PKZIP (DEFLATE algorithm) still wins. Lossless vs Lossy. It tries to find another way to compress files. Apr 15, 2014 · This compression tool was first released in 2009, and has gained a steady following ever since. If you had a collection of numbers that always consisted of the same amount of numbers (say a collection of 10 numbers) and you could figure out a way to calculate a formula from that collection of numbers so that you could reconstruct it High-compression (low quality) JPEG. This algorithm has a greater compression ratio than the previous two examples, making it a great format when you need to store data on limited disk space. 75 compression ratio. This form is useful as most languages are faster with numbers then strings. Disabling data compression must always succeed. The decompression algorithm is just the same. gzip does offer much faster decompression but the compression ratio gzip offers is far worse. Gzip is a lossless algorithm for data compression. io /zstd /. The fastest algorithm are by far lzop and lz4 which can produce a compression level not very far from gzip in 1. So now I am wondering whether Statistical compression or Dictionary compression is more suitable for large English text compression in BCJ filter can convert relative addresses of instructions in ELF files to absolute addresses to improve the compression ratio. Oct 9, 2021 · For text compression, four types of compression algorithms are used that are Huffman, LZW, run length encoding and Shannon–Fano. This compression algorithm is also known as LZ77 and LZ78 are the two lossless data compression algorithms. Even if the compressed row fits on the page, which means that it's less than 8,060 bytes; SQL Server prevents updates that don't fit on the row when it's uncompressed. Regardless of whether the bits represent a document or a GIF, computers can use a bit compression technique called Huffman coding. In this work, we study the task of compressing encrypted data, when a small amount of knowledge about the structure of the underlying plaintexts is known. Deflate is the fastest algorithm in terms of compression and decompression speed, but provides low compression ratio. 1,1,1,1 to something 1X4 or 114. It provides high compression ratios as well as great compression and decompression speeds, offering best-in-kind performance in many conventional situations. Sep 3, 2021 · Lempel-Ziv compression. It achieves a good compression (tied to the best) at high write speeds. The variable-length codes assigned to input characters are Prefix Codes, means the codes (bit sequences Wikipedia on compression algorithms: 7z's LZMA algorithm reaches a higher compression ratio than RAR, except for "multimedia" files like . The Idea relies on reoccurring patterns to save data space. Ideally I'm looking for: A recommendation of a piece of software $ kopia benchmark compression \ --data-file= Run compression benchmarks Flag Short Default Help --[no-]by-alloc false Sort results by allocated bytes --[no-]by-size false Sort results by size --data-file Use data from the given file --[no-]deprecated false Included deprecated compression algorithms --parallel 1 Number of parallel goroutines --[no-]print-options false Print out options Sep 11, 2023 · Huffman Coding | Greedy Algo-3. Other algorithms can produce smaller archives but most are are increbible slow to pack and unpack data. So simply multiply all numbers by 100 when compressing, and divide by 100 when decompressing. PNG images use lossless compression while JPEG images can and often do use lossy compression. It compresses files using the Burrows-Wheeler block-sorting compression algorithm and Huffman coding. The first free option in this roundup, 7-Zip is another program with an excellent reputation. Asaph +1. Should become THE data format for compressing XML data in the future (claimed to be the last necessary binary format). Dec 7, 2020 · Zopfli is a zlib-compatible compression algorithm that trades superior compression ratio for a long runtime. VP8 is a video compression format created by On2 Technologies as a successor to the VP6 and VP7 formats. Data compression is the process of reducing the size of a file using some compression algorithm. They don't need to worry about the end result sounding the same, like people do, so they can compress even further. This algorithm uses a dictionary compression scheme somewhat similar to the LZ77 algorithm published by We would like to show you a description here but the site won’t allow us. More concretely, we consider encryptions of vectors \ (\boldsymbol {m} = (m_1, \dots , m_n)\) where at most t distinct Specifically, in their work, a new compression algorithm, the Z-order compression is introduced, which first maps a set of multidimensional data to 1D binary stream . zstd is also looking very good when the best compression level 19 and multiple cores are Lossless image compression. – May 8, 2018 · Based on A Comparative Study Of Text Compression Algorithms, it seems that Arithmetic coding is preferable in Statistical compression techniques, while LZB is recommended for Dictionary compression techniques. We’ll also present a comparison between them. Also which compression technique is "best" depends very much on what kind of data do you have: imagine 1-bit images obtained by leveling a photo and a screenshot. To get the highest zstd compression: zstd --long -19 -T0. Such algorithms can be used for images or sound files but not for text or Apr 9, 2009 · Generally for smaller blocks of data, the algorithms compress about the same (give or take a few bytes) mostly because the algorithms need to transmit the dictionary or Huffman trees in addition to the payload. They include deflate, deflate64, bzip2, lzma, wavpack, and ppmd. gzip-9 provides the best data compression. Most lossless compression programs do two things in sequence: the first step generates a statistical model for the input data, and the second step uses this model to map input data to bit sequences in such a way that "probable" (i. Mar 10, 2020 · Peak-Signal-To-Noise Ratio (PSNR) Lossy Compression: the “two” step process. License. 3: Burrow Wheeler technique (BWT) sorts the input by The absolute best possible compression ratio; Compatibility with standard readers, such as Windows and WinZip; So suggestions such as 7-zip won't be of much use, unless 7-zip is also slightly better at the standard ZIP compression (as opposed to using it's very good . In this tutorial, we’ll discuss three popular data compression techniques: zlib, gzip, and ZIP. 039 seconds per meg. Compression enforces the following two rules: An update to a fixed-length type must always succeed. There only 256 unique values. Huffman coding is a lossless data compression algorithm. The BEST compression algorithms that I know of are NNCP - an AI based file compression algorithm and is extremely slow, and CMIX which might take literal years to compress your data. Jan 8, 2024 · By serializing CustomerSlim to an array, we achieve our best result: 34. And for xz: xz -9 -T0. Its power comes from its simplicity, speed, and decent compression rates. Images are all around us, from application icons to animated GIFs to photos. In terms of the "strongest" compression, xz is than another and one would want to pick your algorithm appropriately. Lossless compression: The lossless compression format is developed by the WebP team. Perhaps the best attempt to systematically compare lossless compression algorithms is the Archive Comparison Test (ACT) by Jeff Gilchrist. Though Zopfli takes more time to compress, this is an acceptable tradeoff for reducing network traffic. net framework just implements that one compression algorithm). Zstandard is a lossless data compression algorithm developed by Yann Collet at Facebook . Jul 1, 2021 · Modern compression algorithms like zstd can be really fast. These techniques are used to reduce data size for storing, handling, and transmitting content. To mirror our test commands exactly, the correct syntax would look like this: $ sudo time nice -n -20 tar -czvf archive. 0-or-later (dual-licensed) Website. --ultra unlocks levels up to 21 but the benefit is near zero with a huge increase in memory usage. gzip-6 is the default. Zstd is the corresponding reference implementation in C, released as open-source software on 31 August 2016. For the simplest of images, computers can use a compression algorithm called run-length encoding (RLE). RLE compression. Step 2. gzip has much faster decompression than BWT (e. TimescaleDB deploys different compression algorithms, depending on the data type: Delta-of-delta May 10, 2010 · Deflate is the pure compression algorithm, while GZipStream includes a CRC checksum and could be extended by writing different compression algorithms (The current . Flate/deflate compression. Zstd is the reference implementation in C. Lossy compression can remove data from a file. Unless if you are working with a list of random numbers stored as a string (in which case no compression algorithm will work) knowing the kind of data usually allows to apply much better algorithms than general purpose ones (see other answers for good ready to use general compression algorithms). Feb 24, 2022 · The advantages of compression include the need to buy less storage hardware, lower data transmission times, and lower consumption of bandwidth. 7. It also supports several additional compression methods, such as run-length encoding, delta encoding and sparse bit array. another and one would want to pick your algorithm appropriately. And compression shrinks our JSON data to just one-seventh of the original size! 9. Second, I would delta-code the numbers by subtracting the last number from each. Lossless compression is about removing bits without actually eliminating information. Sep 16, 2020 · Zstandard (or zstd) is a lossless data compression algorithm developed by Yann Collet at Facebook. Each of these algorithms offers different trade-offs: lz4 aims for speed, xz aims for higher compression ratios, and zlib aims for a good balance of speed and size. For a starter you should begin with a LZ77 or LZ78 algorithm which offer quite good compression ratio and a small decompression stub (obviously having a small decompression stub is a must have for a packer). 4. 45. For 16-bit TIFFs, use ZIP compression. Adaptive Sound Technologies. Overview. Dec 27, 2008 · I have found that the compression algorithm tends to be more effective than choosing an alternative format. : : : : : compression method 6, length 1 byte. Gzip and Bzip2 are compression formats, not archive formats. If you are going to go with JPEG/DCT then I would recommend highest quality, otherwise you will get artifacts around the straight edges of text. github . " For some uses, compression can take a long time but The fastest compression for . A lossless compression algorithm compresses data such that it can be decompressed to achieve exactly what was given before compression. LZ4 is lossless compression algorithm, providing compression speed > 500 MB/s per core, scalable with multi-cores CPU. compression method 1, length 2 bytes The top three zRAM algorithms in terms of performance and efficiency for various applications are: 1. 2. Now before we dive into an implementation, let’s understand the concept behind Lempel-Ziv and the various Benchmark them both with samples of the real data you're going to compress. It features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems. 8. Conclusion May 5, 2012 · Correct me if I'm wrong, but are you working out the best compression for the first segment from the following choices (method 0 is uncompressed): compression method 0, length 1 byte. Usually it provides high compression ratio and high speed for text files. at tp ya eo ff ry yn vf yq zq