diff options
Diffstat (limited to '')
-rwxr-xr-x | home-manger/firefox/unzip_mozlz4.py | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/home-manger/firefox/unzip_mozlz4.py b/home-manger/firefox/unzip_mozlz4.py new file mode 100755 index 00000000..311fd214 --- /dev/null +++ b/home-manger/firefox/unzip_mozlz4.py @@ -0,0 +1,43 @@ +#!/usr/bin/python +# source: https://unix.stackexchange.com/a/497861 +# Command-line tool to decompress mozLz4 files used for example by Firefox to store various kinds of session backup information. +# Works in both Python 2.7.15 and 3.6.7, as of version 2.1.6 of the LZ4 Python bindings at pypi.org/project/lz4. +# To use in another script, simply cut and paste the import statement and the mozlz4_to_text() function (lines 8 to 17). + +import lz4.block # pip install lz4 --user + + +def mozlz4_to_text(filepath): + # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, + # return the uncompressed text. + bytestream = open(filepath, "rb") + bytestream.read(8) # skip past the b"mozLz40\0" header + valid_bytes = bytestream.read() + text = lz4.block.decompress(valid_bytes) + return text + + +def main(args): + # Given command-line arguments of an input filepath for a ".mozlz4" file + # and optionally an output filepath, write the decompressed text to the + # output filepath. + # Default output filepath is the input filepath minus the last three characters + # (e.g. "foo.jsonlz4" becomes "foo.json") + filepath_in = args[0] + if len(args) < 2: + filepath_out = filepath_in[:-3] + else: + filepath_out = args[1] + text = mozlz4_to_text(filepath_in) + with open(filepath_out, "wb") as outfile: + outfile.write(text) + print("Wrote decompressed text to {}".format(filepath_out)) + + +if __name__ == "__main__": + import sys + args = sys.argv[1:] + if args and not args[0] in ("--help", "-h"): + main(args) + else: + print("Usage: mozlz4.py <mozlz4 file to read> <location to write>") |