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import struct
class reader(object):
"""Wrapper around a read-only binary file"""
def __init__(self, fileorname):
"""fileorname may be a file-like object or a filename"""
self.byteorder = '=' # can also be '<' or '>'
if hasattr(fileorname, 'read'):
self.file = fileorname
else:
self.file = file(fileorname, 'rb')
def read(self,len): return self.file.read(len)
def stream(self, fmt, len=0):
"""Unpack fmt from f and return results."""
fmt = self.byteorder + fmt # don't enforce alignment!
if len == 0: len = struct.calcsize(fmt)
data = self.file.read(len)
return struct.unpack(fmt, data)
def stream1(self, fmt, len=0):
"""Unpack fmt from f and return just one result."""
(data,) = self.stream(fmt,len)
return data
def _streamStringLow(self, len):
if len <= 0: return ''
str = self.file.read(len-1)
char = self.file.read(1)
if ord(char)==0: return str
else: return str+char
def streamCooky(self):
l = list(self.stream("4c"))
l.reverse()
return ''.join(l)
def streamString4(self):
"""Stream string prefixed with 4 bytes of length"""
(strlen,) = self.stream("I",4)
if strlen >= 2048:
print "Bad string len: %#x" % strlen
assert strlen < 2048
return self._streamStringLow(strlen)
def streamString2(self):
"""Stream string prefixed with 2 bytes of length"""
(strlen,) = self.stream("H",2)
assert strlen < 2048
return self._streamStringLow(strlen)
def streamString1(self):
"""Stream string prefixed with 1 byte of length"""
(strlen,) = self.stream("B",1)
assert strlen < 2048
return self._streamStringLow(strlen)
class writer(object):
"""Wrapper around a write-only binary file"""
def __init__(self, fileorname):
"""fileorname may be a file-like object or a filename"""
if hasattr(fileorname, 'write'):
self.file = fileorname
else:
self.file = file(fileorname, 'wb')
def write(self,data): return self.file.write(data)
def stream(self, fmt, *args):
fmt = '='+fmt # add the "no alignment" flag to the fmt
self.file.write(struct.pack(fmt, *args))
# for symmetry with reader
def stream1(self, fmt, *args):
fmt = '='+fmt # add the "no alignment" flag to the fmt
self.file.write(struct.pack(fmt, *args))
def streamCooky(self, cooky):
assert len(cooky)==4
l = list(cooky)
l.reverse()
self.stream("4c", *l)
def streamString1(self, str):
"""Stream string prefixed with 1 byte of length"""
#print "writing %s" % str
# Game doesn't handle 0-length null strings
self.file.write(struct.pack("B",len(str)+1))
self.file.write(str)
self.file.write("\0")
def streamString2(self, str):
"""Stream string prefixed with 2 bytes of length"""
#print "writing %s" % str
# Game doesn't handle 0-length null strings
self.file.write(struct.pack("H",len(str)+1))
self.file.write(str)
self.file.write("\0")
def streamString4(self, str):
"""Stream string prefixed with 4 bytes of length"""
if str=='':
self.file.write(struct.pack("I",0))
else:
#print "writing %s" % str
self.file.write(struct.pack("I",len(str)+1))
self.file.write(str)
self.file.write("\0")
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