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NAME ^

Compress::LZ4 - Perl interface to the LZ4 (de)compressor

SYNOPSIS ^

    use Compress::LZ4;

    my $compressed = compress($bytes);
    my $decompressed = decompress($compressed);

DESCRIPTION ^

The Compress::LZ4 module provides an interface to the LZ4 (de)compressor.

FUNCTIONS ^

compress

    $compressed = compress($bytes)

Compresses the given buffer and returns the resulting bytes. The input buffer can be either a scalar or a scalar reference.

compress_hc

    $compressed = compress_hc($bytes)

A higher-compression, but slower, version of compress.

decompress

uncompress

    $bytes = decompress($compressed)

Decompresses the given buffer and returns the resulting bytes. The input buffer can be either a scalar or a scalar reference.

On error (in case of corrupted data) undef is returned.

COMPATIBILITY ^

Because LZ4 does not define a container format, the original data size is prepended to the compressed data as a little-endian 4-byte integer. This format is compatible with the majority of other LZ4 language bindings.

If you are dealing with raw data from an external source that does not format the data this way, you need to use the following functions.

lz4_compress

lz4_compress_hc

Same as compress/compress_hc but does not add the length header.

lz4_decompress

lz4_uncompress

    $bytes = decompress($compressed, $original_data_size)

Same as decompress/uncompress but also requires the original data size to be given.

PERFORMANCE ^

This distribution contains a benchmarking script which compares several compression modules available on CPAN. These are the results on a MacBook 2GHz Core 2 Duo (64-bit) with Perl 5.16.0:

    Compressible data (10 KiB) - compression
    ----------------------------------------
    Compress::LZ4::compress     185579/s  1812 MiB/s  1.152%
    Compress::Snappy::compress  119467/s  1167 MiB/s  5.332%
    Compress::LZF::compress      45728/s   447 MiB/s  1.865%
    Compress::LZ4::compress_hc   21082/s   206 MiB/s  1.152%
    Compress::Zlib::compress      6164/s    60 MiB/s  1.201%
    Compress::Bzip2::compress      114/s     1 MiB/s  2.070%

    Compressible data (10 KiB) - decompression
    ------------------------------------------
    Compress::LZ4::decompress     573439/s  5600 MiB/s
    Compress::Snappy::decompress  192752/s  1882 MiB/s
    Compress::LZF::decompress     139184/s  1359 MiB/s
    Compress::Zlib::uncompress     30632/s   299 MiB/s
    Compress::Bzip2::decompress     6347/s    62 MiB/s

    Uncompressible data (10 KiB) - compression
    ------------------------------------------
    Compress::LZ4::compress     827077/s  8077 MiB/s  110.000%
    Compress::Snappy::compress  618951/s  6044 MiB/s  103.333%
    Compress::LZF::compress     608424/s  5942 MiB/s  101.667%
    Compress::LZ4::compress_hc   22974/s   224 MiB/s  110.000%
    Compress::Zlib::compress     22755/s   222 MiB/s  115.000%
    Compress::Bzip2::compress    15358/s   150 MiB/s  215.000%

    Uncompressible data (10 KiB) - decompression
    --------------------------------------------
    Compress::LZF::decompress     2513115/s  24542 MiB/s
    Compress::LZ4::decompress     2502283/s  24436 MiB/s
    Compress::Snappy::decompress  2406041/s  23496 MiB/s
    Compress::Zlib::uncompress      90163/s    880 MiB/s
    Compress::Bzip2::decompress     50124/s    489 MiB/s

SEE ALSO ^

http://code.google.com/p/lz4/

REQUESTS AND BUGS ^

Please report any bugs or feature requests to http://rt.cpan.org/Public/Bug/Report.html?Queue=Compress-LZ4. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT ^

You can find documentation for this module with the perldoc command.

    perldoc Compress::LZ4

You can also look for information at:

COPYRIGHT AND LICENSE ^

Copyright (C) 2012-2014 gray <gray at cpan.org>, all rights reserved.

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

AUTHOR ^

gray, <gray at cpan.org>

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