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57 lines
1.4 KiB
Python
57 lines
1.4 KiB
Python
from common import *
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class LZ77(WiiHeader):
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class WiiLZ77: # class by marcan, used under scope of BSD license
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TYPE_LZ77 = 1
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def __init__(self, file, offset):
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self.file = file
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self.offset = offset
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self.file.seek(self.offset)
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hdr = struct.unpack("<I",self.file.read(4))[0]
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self.uncompressed_length = hdr>>8
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self.compression_type = hdr>>4 & 0xF
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if self.compression_type != self.TYPE_LZ77:
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raise ValueError("Unsupported compression method %d"%self.compression_type)
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def uncompress(self):
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dout = ""
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self.file.seek(self.offset + 0x4)
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while len(dout) < self.uncompressed_length:
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flags = struct.unpack("<B",self.file.read(1))[0]
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for i in range(8):
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if flags & 0x80:
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info = struct.unpack(">H",self.file.read(2))[0]
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num = 3 + ((info>>12)&0xF)
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disp = info & 0xFFF
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ptr = len(dout) - (info & 0xFFF) - 1
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for i in range(num):
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dout += dout[ptr]
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ptr+=1
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if len(dout) >= self.uncompressed_length:
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break
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else:
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dout += self.file.read(1)
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flags <<= 1
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if len(dout) >= self.uncompressed_length:
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break
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self.data = dout
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return self.data
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def remove(self):
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hdr = self.data[:4]
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if hdr != "LZ77":
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return self.data
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file = StringIO.StringIO(self.data)
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file.seek(4)
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unc = self.WiiLZ77(file, file.tell())
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data = unc.uncompress()
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return data
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def compress(self, fn = ""):
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raise NotImplementedError
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