## example.lua

    --- LibDeflate usage example
    -- @author Haoqian He
    -- @file example.lua

    local LibDeflate

    if LibStub then -- You are using LibDeflate as WoW addon
    	LibDeflate = LibStub:GetLibrary("LibDeflate")
    else
    	-- You are using LibDeflate as Lua library.
    	-- Setup the path to locate LibDeflate.lua,
    	-- if 'require("LibDeflate")' fails, for example:
    	-- package.path = ("?.lua;../?.lua;")..(package.path or "")
    	LibDeflate = require("LibDeflate")
    end

    local example_input = "12123123412345123456123456712345678123456789"

    -- Compress using raw deflate format
    local compress_deflate = LibDeflate:CompressDeflate(example_input)

    -- decompress
    local decompress_deflate = LibDeflate:DecompressDeflate(compress_deflate)
    -- Check if the first return value of DecompressXXXX is non-nil to know if the
    -- decompression succeeds.
    if decompress_deflate == nil then
    	error("Decompression fails.")
    else
    	-- Decompression succeeds.
    	assert(example_input == decompress_deflate)
    end

    -- If it is to transmit through WoW addon channel,
    -- compressed data must be encoded so NULL ("\000") is not transmitted.
    local data_to_trasmit_WoW_addon = LibDeflate:EncodeForWoWAddonChannel(
    	compress_deflate)
    -- When the receiver gets the data, decoded it first.
    local data_decoded_WoW_addon = LibDeflate:DecodeForWoWAddonChannel(
    	data_to_trasmit_WoW_addon)
    -- Then decomrpess it
    assert(LibDeflate:DecompressDeflate(data_decoded_WoW_addon) == example_input)

    -- The compressed output is not printable. EncodeForPrint will convert to
    -- a printable format, in case you want to export to the user to
    -- copy and paste. This encoding will make the data 25% bigger.
    local printable_compressed = LibDeflate:EncodeForPrint(compress_deflate)

    -- DecodeForPrint to convert back.
    -- DecodeForPrint will remove prefixed and trailing control or space characters
    -- in the string before decode it.
    assert(LibDeflate:DecodeForPrint(printable_compressed) == compress_deflate)

    -------------------------------------------------------------------------------
    -------------------------------------------------------------------------------
    -------------------------------------------------------------------------------

    --- Compress and decompress using zlib format
    local compress_zlib = LibDeflate:CompressZlib(example_input)
    local decompress_zlib = LibDeflate:DecompressZlib(compress_zlib)
    assert(decompress_zlib == example_input)

    --- Control the compression level
    -- NOTE: High compression level does not make a difference here,
    -- because the input data is very small
    local compress_deflate_with_level = LibDeflate:CompressDeflate(example_input
    	, {level = 9})
    local decompress_deflate_with_level = LibDeflate:DecompressDeflate(
    	compress_deflate_with_level)
    assert(decompress_deflate_with_level == example_input)

    -- Compress with a preset dictionary
    local dict_str = "121231234" -- example preset dictionary string.
    -- print(LibDeflate:Adler32(dict_str), #dict_str)
    -- 9 147325380
    -- hardcode the print result above, the ensure it is not modified
    -- accidenttaly during the program development.
    --
    -- WARNING: The compressor and decompressor must use the same dictionary.
    -- You should be aware of this when tranmitting compressed data over the
    -- internet.
    local dict = LibDeflate:CreateDictionary(dict_str, 9, 147325380)

    -- Using the dictionary with raw deflate format
    local compress_deflate_with_dict = LibDeflate:CompressDeflateWithDict(
    	example_input, dict)
    assert(#compress_deflate_with_dict < #compress_deflate)
    local decompress_deflate_with_dict = LibDeflate:DecompressDeflateWithDict(
    	compress_deflate_with_dict, dict)
    assert(decompress_deflate_with_dict == example_input)

    -- Using the dictionary with zlib format, specifying compression level
    local compress_zlib_with_dict = LibDeflate:CompressZlibWithDict(
    	example_input, dict, {level = 9})
    assert(#compress_zlib_with_dict < #compress_zlib)
    local decompress_zlib_with_dict = LibDeflate:DecompressZlibWithDict(
    	compress_zlib_with_dict, dict)
    assert(decompress_zlib_with_dict == example_input)

generated by LDoc 1.4.6 Last updated 2018-07-30 02:06:38