import zlib

from gzip import GzipFile

from ..__common__ import *

__examples__ = {'enc-dec(gzip)': ["test", "This is a test"]}

__guess__ = ["gzip"]

def gzip_encode(text, errors="strict"):

out = BytesIO()

with GzipFile(fileobj=out, mode="wb") as f:

f.write(b(text))

return out.getvalue(), len(text)

def gzip_decode(data, errors="strict"):

# then try decompressing considering the file signature

try:

with GzipFile(fileobj=BytesIO(b(data)), mode="rb") as f:

r = f.read()

except:

pass

# try decompressing without considering the file signature

try:

r = zlib.decompress(b(data), 16 + zlib.MAX_WBITS)

except:

return handle_error("gzip", errors, decode=True)(data[0], 0) if len(data) > 0 else "", len(data)

return r, len(r)

add("gzip", gzip_encode, gzip_decode)

This is, of course, not an encoding properly speaking, but it is implemented for the sake of convenience.

**Codec** | **Conversions** | **Aliases** | **Comment**

:---: | :---: | --- | ---

`gzip` | data <-> GZipped data | | decoding tries with and without the file signature

>>> codext.encode('test', "gzip")

>>> codext.decode('\x1f\x8b\x08\x00\x0esÛ_\x02ÿ+I-.\x01\x00\x0c~\x7fØ\x04\x00\x00\x00', "gzip")