LZ77
A dictionary-based compression algorithm built on a sliding window. It finds repeated strings and replaces them with distance-length pointer pairs, and it is a core component of compression algorithms such as DEFLATE.
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The DEFLATE algorithm combines two strategies: the LZ77 algorithm and Huffman coding.
The foundation of almost all common compression formats is built on the algorithms proposed by Lempel and Ziv (LZ77, LZ78), which is also why a large number of compression schemes start with "LZ."
LZ77 uses a sliding window to find repeated byte strings and represents repetitions as (distance, length) pairs; LZ78 builds a dictionary and encodes repeated strings as indices. Both achieve lossless compression.
The DEFLATE algorithm used by gzip is based on LZ77 sliding window and Huffman coding, with a maximum sliding window of 32KB for standard gzip.
In DEFLATE, the LZ77 stage replaces repeated bytes with offset+length pointers, and the Huffman coding stage builds variable-length prefix codes for symbols so that high-frequency symbols use shorter encodings.
All Facts (6)
zlib是基于DEFLATE算法的无损数据压缩库，结合了LZ77算法和哈夫曼编码两种技术
60%UnverifiedThe DEFLATE algorithm combines two strategies: the LZ77 algorithm and Huffman coding.
50%UnverifiedThe foundation of almost all common compression formats is built on the algorithms proposed by Lempel and Ziv (LZ77, LZ78), which is also why a large number of compression schemes start with "LZ."
50%UnverifiedLZ77 uses a sliding window to find repeated byte strings and represents repetitions as (distance, length) pairs; LZ78 builds a dictionary and encodes repeated strings as indices. Both achieve lossless compression.
50%UnverifiedThe DEFLATE algorithm used by gzip is based on LZ77 sliding window and Huffman coding, with a maximum sliding window of 32KB for standard gzip.
50%UnverifiedIn DEFLATE, the LZ77 stage replaces repeated bytes with offset+length pointers, and the Huffman coding stage builds variable-length prefix codes for symbols so that high-frequency symbols use shorter encodings.
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