zlib

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File Format
Name zlib
Ontology
Released 1995

zlib format is a variant of the DEFLATE compressed data format. It adds a lightweight container, a small amount of configurability, and error checking.

zlib is also the name of a software library that supports the zlib format, and other formats related to DEFLATE.

There are many formats and protocols that use, or may use, zlib format. A notable example is PNG.

Contents

See also

Identification

The first byte of a zlib datastream has eight possible values: 0x08, 0x18, 0x28, ..., 0x78.

If the first two bytes are interpreted as a big-endian integer, it is always a multiple of 31.

Specifications

  • RFC 1950: ZLIB Compressed Data Format Specification version 3.3

Software

See also DEFLATE#Software.

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