zlib_constants: Retrieve zlib Constants

In zlib: Compression and Decompression

Retrieve zlib Constants

Description

This function returns a list of constants from the zlib C library.

Usage

zlib_constants()

Details

The constants are defined as follows:

• DEFLATED: The compression method, set to 8.

• DEF_BUF_SIZE: The default buffer size, set to 16384.

• DEF_MEM_LEVEL: Default memory level, set to 8.

• MAX_WBITS: Maximum size of the history buffer, set to 15.

• Z_BEST_COMPRESSION: Best compression level, set to 9.

• Z_BEST_SPEED: Best speed for compression, set to 1.

• Z_BLOCK: Block compression mode, set to 5.

• Z_DEFAULT_COMPRESSION: Default compression level, set to -1.

• Z_DEFAULT_STRATEGY: Default compression strategy, set to 0.

• Z_FILTERED: Filtered compression mode, set to 1.

• Z_FINISH: Finish compression mode, set to 4.

• Z_FULL_FLUSH: Full flush mode, set to 3.

• Z_HUFFMAN_ONLY: Huffman-only compression mode, set to 2.

• Z_NO_COMPRESSION: No compression, set to 0.

• Z_NO_FLUSH: No flush mode, set to 0.

• Z_PARTIAL_FLUSH: Partial flush mode, set to 1.

• Z_RLE: Run-length encoding compression mode, set to 3.

• Z_SYNC_FLUSH: Synchronized flush mode, set to 2.

• Z_TREES: Tree block compression mode, set to 6.

Value

A named list of zlib constants.

Examples

constants <- zlib_constants()

zlib documentation built on Oct. 19, 2023, 1:13 a.m.