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Shortcomings of LZ77 Algorithm even string founds no match. In LZ77, search buffer is thousands of bytes long, while the look-ahead buffer is tens of byte long. pattern. LZ77 doesn't have its external dictionary which cause problem while decompressing on another machine.

The Lempel–Ziv (LZ) compression methods are among the most popular algorithms for lossless storage. DEFLATE is a variation on LZ optimized for decompression speed and compression ratio, but compression can be slow.

In this post we are going to explore LZ77, a lossless data-compression algorithm created by Lempel and Ziv in 1977. This algorithm is widely spread in our current systems since, for instance, ZIP and GZIP are based on LZ77.

The main advantage of LZ77 is the decompression is extremely fast, a lot of LZ77 variants don't improve a lot on compression ratio, but they do improve on speed instead. In the original LZ77 algorithm suggested that you should encode every possible match, so even matches with only length 1.

LZW compression is a method to reduce the size of Tag Image File Format (TIFF) or Graphics Interchange Format (GIF) files. It is a table-based lookup algorithm to remove duplicate data and compress an original file into a smaller file. LZW compression is also suitable for compressing text and PDF files.

LZ78-based schemes work by entering phrases into a 'dictionary' and then, when a repeat occurrence of that particular phrase is found, outputting a that consists of the dictionary index instead of the phrase, as well as a single character that follows that phrase.

The LZW algorithm is a greedy algorithm in that it tries to recognize increasingly longer and longer phrases that are repetitive, and encode them. Each phrase is defined to have a prefix that is equal to a previously encoded phrase plus one additional character in the alphabet.