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Compress::LZW::Compressor(3) User Contributed Perl Documentation Compress::LZW::Compressor(3)

Compress::LZW::Compressor - Scaling LZW compressor class

version 0.04

 use Compress::LZW::Compressor;
 my $c   = Compress::LZW::Compressor->new();
 my $lzw = $c->compress( $some_data );

Default: 1

Block mode is a feature added to LZW by compress(1). Once the maximum code size has been reached, if the compression ratio falls (NYI) the code table and code size can be reset, and a code indicating this reset is embedded in the output stream.

May be 0 or 1.

Default: 16

Maximum size in bits that code output may scale up to. This value is stored in byte 3 of the compressed output so the decompressor can also stop at the same size automatically. Maximum code size implies a maximum code table size of "2 ** max_code_size", which can be emptied and restarted mid-stream in "block_mode".

May be between 9 and 31, inclusive. The default of 16 is the largest supported by compress(1), but Compress::LZW can handle up to 31 bits.

Compresses $input with the current settings and returns the result.

Resets the compressor state for another round of compression. Automatically called at the beginning of compress().

Resets the following internal state: Code table, next code number, code size, output buffer, buffer position

Meredith Howard <>

This software is copyright (c) 2015 by Meredith Howard.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2015-02-10 perl v5.32.1

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