def decodeTextFile(filePath, outputFilePath='/'):
if outputFilePath == '/':
outputFilePath = os.path.splitext(filePath)[0] + '.txt'
bfileReader = open(filePath, "rb")
dict = getNgramDict()
SO = chr(0x000E)
SI = chr(0x000F)
fileBytes = bfileReader.read()
fileBits = BitArray(fileBytes).bin
bitsReader = False
charStream = ''
binStream = ''
decoded = ''
while len(fileBits) > 0:
t = len(fileBits)
#byte = fileBits[:4]
#fileBits = fileBits[4:]
if bitsReader:
firstBits = fileBits[:4]
fileBits = fileBits[4:]
if firstBits == '0000':
bStreamLen = len(binStream) + 4
skip = 0 if bStreamLen % 8 == 0 else 8 - (bStreamLen % 8)
fileBits = fileBits[skip:]
bitsReader = False
else:
size = 18 if firstBits == '1111' else int(firstBits, 2)
binStream += firstBits + fileBits[:size]
fileBits = fileBits[size:]
else:
char = chr(int(fileBits[:8], 2))
bin = fileBits[:8]
fileBits = fileBits[8:]
if char == SO:
charStreamHex = BitArray(bin=charStream).bytes
decodedChars = charStreamHex.decode(errors='strict')
#print('c: ' + decodedChars)
#TODO: implement logger
decoded += decodedChars
bitsReader = True
charStream = ''
continue
elif char == SI:
decodedBits = decodeBinStream(binStream, dict)
#print('b: ' + decodedBits)
#TODO: implement logger
decoded += decodedBits
binStream = ''
bitsReader = False
nextChar = chr(int(fileBits[:8], 2))
if nextChar in [',', '.']:
decoded = decoded[:-1]
continue
else:
charStream += bin
if len(charStream) > 0:
charStreamHex = BitArray(bin=charStream).bytes
decodedChars = charStreamHex.decode(errors='strict')
#print('c: ' + decodedChars)
#TODO: implement logger
decoded += decodedChars
decoded = ''.join([line.rstrip() + '\n' for line in decoded.splitlines()])
decoded = decoded[:-1] #delete newline
decodedFile = open(outputFilePath, "w", encoding="utf-8")
decodedFile.write(decoded)
#print(decoded)
print("File was decompressed.")
