Lua

Decompress a Base64-Encoded Gzip String

See more Gzip Examples

This example demonstrates how to use the UncompressStringENC method to decompress Gzip-compressed data that is provided as an encoded string.

The example first compresses a string and encodes the result as Base64. It then demonstrates how the Base64 string can be decoded and decompressed back into the original text.

Internally, the method performs three steps:

1. The input string is decoded from the specified encoding (Base64 in this example) to obtain the compressed binary data.
2. The binary data is decompressed using the Gzip algorithm.
3. The resulting bytes are interpreted using the specified character set (UTF-8) to produce the final string.

This method is useful when working with compressed data embedded in text-based formats such as JSON, XML, or HTTP responses.

Lua

local chilkat = require("chilkat")

-- This example demonstrates how to decompress Gzip data that is
-- provided as a Base64-encoded string.

local gzip = chilkat.Gzip.new()

-- First, create a compressed Base64 string for demonstration purposes:
local inputStr = "The quick brown fox jumps over the lazy dog."
gzip.filename = "quickBrownFox.txt"
local compressedBase64 = gzip:compress_string_enc(inputStr, "utf-8", "base64")
if not gzip.last_method_success then
    print(gzip.last_error_text)
    return
end

print("Compressed (Base64): " .. compressedBase64)

-- Now decompress the Base64-encoded Gzip string:
local decompressed = gzip:uncompress_string_enc(compressedBase64, "utf-8", "base64")
if not gzip.last_method_success then
    print(gzip.last_error_text)
    return
end

print("Decompressed string:")
print(decompressed)