def compress_with_preset(data):
initial = compress(PRESET + data)
pos = 0
for i, j in zip(initial[4:], COMPRESSED_PRESET):
if i != j:
break
pos += 1
return pos, initial[:4], initial[pos+4:]
ateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertran
sfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locati
oncontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMo
ndayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSe
pOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplic
ation/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1
.1statusversionurlMozillaMacintoshIntelMacGeckoKHTMLVersionAppleWebKitMac
10_5_8OS XSafarigzipen
""".strip().split())
# putting "en" at the end seems to improve compression ratio??
LEN_PRESET = len(PRESET)
COMPRESSED_PRESET = compress(PRESET)[4:]
def compress_with_preset(data):
initial = compress(PRESET + data)
pos = 0
for i, j in zip(initial[4:], COMPRESSED_PRESET):
if i != j:
break
pos += 1
return pos, initial[:4], initial[pos+4:]
def decompress_with_preset(pos, size, data):
return decompress(size + COMPRESSED_PRESET[:pos] + data)[LEN_PRESET:]
pos, size, output = compress_with_preset(HEADERS)
input = decompress_with_preset(pos, size, output)
