gzip is a file format and a software application used for file compression and decompression. The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from which the "g" of gzip is derived).

1970年1月1日 · gzip reduces the size of the named files using Lempel–Ziv coding (LZ77). Whenever possible, each file is replaced by one with the extension ‘.gz’, while keeping the same ownership modes, access and modification times.

一个GZIP文件主体分为三个部分,如下图所示： 其中头部是元数据，中间是deflate的压缩数据块，尾部是固定 8byte 的元数据，接下来具体详细地介绍这三个部分。 和其他格式一样，Gzip文件的头部定义了该文件的元数据信息。 该部分的长度不固定，至少10byte大小，其格式如下表所示： 这个flag定义了header中超过10字节的部分的含义，依据不同的值，其表示的含义也不同。 一般来说File flag的值都是 0x08，表示了header中10byte偏移之后的部分是文件名（使用C风格字符 …

2012年7月18日 · It is not common, but you will sometimes see concatenated gzip streams in a single file. gzip considers that to be a single stream of data, not multiple "files", so the file names are ignored. If by "How delimit the last block" you mean the last deflate block, then the last deflate block simply has a bit in its header that marks it as the last ...

Gzip reduces the size of the named files using Lempel-Ziv coding (LZ77). Whenever possible, each file is replaced by one with the extension .gz, while keeping the same ownership modes, access and modification times. (The default extension is -gz for VMS, z for MSDOS, OS/2 FAT, Windows NT FAT and Atari.)

2024年2月12日 · gzip（GNU zip）是一种在Linux系统中常见的命令行压缩工具。 它使用DEFLATE压缩算法来减小文件的大小，使文件更易于存储和传输。 gzip主要用于压缩文本文件、Tar归档文件和网页。

Gzip reduces the size of the named files using Lempel-Ziv coding (LZ77). Whenever possible, each file is. replaced by one with the extension .gz, while keeping the same ownership modes, access and modification times. (The default extension is -gz for VMS, z for MSDOS, OS/2 FAT, Windows NT FAT and Atari.) If no files are.

2012年6月30日 · The GZIP file format, then, after the standard header, consists of a series of blocks. The block format is a single bit indicating whether or not this block is the last block (1 = yes, 0 = no), and two bits indicating the block type: 00 = uncompressed, 01 = compressed using fixed Huffman codes, 10 = compressed using declared dynamic Huffman ...

By default, gzip keeps the original file name and timestamp in the compressed file. These are used when decompressing the file with the -N option. This is useful when the compressed file name was truncated or when the timestamp was not preserved after a file transfer.

2016年7月30日 · 压缩是分块（block）输出的，即每处理一定数量的数据就将这部分数据的压缩结果输出一次，而不是一口气将全部数据压缩并输出。 这一点其实我们在上一节中从哈夫曼编码的角度提到过一次，这里还会继_gzip和block的运算关系