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# frozen_string_literal: true
module Gitlab
module Utils
module Gzip
def gzip_compress(data)
# .compress returns ASCII-8BIT, so we need to force the encoding to
# UTF-8 before caching it in redis, else we risk encoding mismatch
# errors.
#
ActiveSupport::Gzip.compress(data).force_encoding("UTF-8")
rescue Zlib::GzipFile::Error
data
end
def gzip_decompress(data)
# Since we could be dealing with an already populated cache full of data
# that isn't gzipped, we want to also check to see if the data is
# gzipped before we attempt to .decompress it, thus we check the first
# 2 bytes for "\x1F\x8B" to confirm it is a gzipped string. While a
# non-gzipped string will raise a Zlib::GzipFile::Error, which we're
# rescuing, we don't want to count on rescue for control flow.
#
data[0..1] == "\x1F\x8B" ? ActiveSupport::Gzip.decompress(data) : data
rescue Zlib::GzipFile::Error
data
end
end
end
end
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