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lzwLib-1.0

Category: Libraries

Addon Information

Author:	Brodrick [More]
Version:	1.0
Date:	10-01-2006 11:04 PM
Size:	4.00 Kb
Downloads:	518
Favorites:	2
MD5:

lzwLib-1.0

A simple lua LZW compression library.

----

Syntax:

lzw:compress("string"[,chatsafe][,CompressTable,TableSize]);
returns compressed string

lzw:decompress("string"[,chatsafe][,CompressTable,TableSize]);
returns decompressed string

----

Typical usage:

----

local compressed = lzw:compress("Some text or arbitrary data in a string");
local decompressed = lzw:decompress(compressed);

----

Optimal compression can be achieved by creating code tables for specific input sets. For example:

----

local DecompressTable = {};
local CompressTable = {};
local TableSize;

lzw:begin_analyze();

for all input strings...
lzw:analyze_string( Str );
...

TableSize = lzw:end_analyze(DecompressTable, CompressTable);

local compressed = lzw:compress("Some data to compress", nil, CompressTable, TableSize);
local decompressed = lzw:decompress(compressed, nil, DecompressTable, TableSize);

----

Note that the decompression table and table size must be stored to be able to decompress data at a later point in time.

----

The resulting compressed string can optionally be output in a chat safe format.

----

local compressed = lzw:compress( Str, true );
local decompressed = lzw:decompress( Str, true );

----

Note that a string that has been compressed using the chat safe flag must be decompressed with the flag or the decompressed
string may become garbled.

Optional Files - lzwLib-1.0

Sorry, there are currently no optional files available.

Comments - lzwLib-1.0

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02-08-2007, 01:12 PM
Tokter A Kobold Labourer Forum posts: 1 File comments: 1 Uploads: 1	Found a bug and a few changes that are necessary: Line 118: for k, v in var do -> for k, v in pairs(var) do Line 285: Input = string.gsub(Input, specialpercent, percent); -> Input = string.gsub(Input, specialpercent, percentpercent); Line 413: for k, v in self.AnalyzeCharacters do -> for k, v in pairs(self.AnalyzeCharacters) do Line 418: for k, v in OutReverseTable do -> for k, v in pairs(OutReverseTable) do

10-02-2006, 12:31 PM

Brodrick

A Fallenroot Satyr

Forum posts: 25

File comments: 14

Uploads: 15

Quote:

Originally posted by kaylen
The US LZW patents expired a couple years ago, it should be fine now. I can't speak for other countries, though.

The fact the patents had expired was a major reason why lzw was used.

__________________
- Brodrick (aka Kirov)

10-02-2006, 10:09 AM
kaylen A Murloc Raider Forum posts: 6 File comments: 40 Uploads: 2	The US LZW patents expired a couple years ago, it should be fine now. I can't speak for other countries, though.

10-02-2006, 08:09 AM
Miravlix A Defias Bandit Forum posts: 2 File comments: 1 Uploads: 5	Lzw Patent http://en.wikipedia.org/wiki/LZW#Patent_issues Great work making lzw for Bliz Lua, but unfortuanately it's a cesspool of patent crap.

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