class compressobj:
# all jython uses wbits for is deciding whether to skip the header if it's negative
def __init__(self, level=6, method=DEFLATED, wbits=MAX_WBITS,
memLevel=0, strategy=0):
if abs(wbits) > MAX_WBITS or abs(wbits) < 8:
raise ValueError, "Invalid initialization option"
self.deflater = Deflater(level, wbits < 0)
self.deflater.setStrategy(strategy)
if wbits < 0:
_get_deflate_data(self.deflater)
self._ended = False
def compress(self, string):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
string = _to_input(string)
self.deflater.setInput(string, 0, len(string))
return _get_deflate_data(self.deflater)
def flush(self, mode=Z_FINISH):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
if mode not in _valid_flush_modes:
raise ValueError, "Invalid flush option"
self.deflater.finish()
last = _get_deflate_data(self.deflater)
if mode == Z_FINISH:
self.deflater.end()
self._ended = True
return last
class compressobj(object):
# All jython uses wbits for is in deciding whether to skip the
# header if it's negative or to set gzip. But we still raise
# ValueError to get full test compliance.
GZIP_HEADER = "\x1f\x8b\x08\x00\x00\x00\x00\x00\x04\x03"
# NB: this format is little-endian, not big-endian as we might
# expect for network oriented protocols. Both are 4 bytes unsigned
# modulus 2^32 per RFC-1952. CRC32.getValue() returns an unsigned
# int as a long, so cope accordingly.
GZIP_TRAILER_FORMAT = struct.Struct("<II") # crc32, size
def __init__(self, level=6, method=DEFLATED, wbits=MAX_WBITS,
memLevel=0, strategy=0):
if abs(wbits) & 16:
if wbits > 0:
wbits -= 16
else:
wbits += 16
self._gzip = True
else:
self._gzip = False
if abs(wbits) > MAX_WBITS or abs(wbits) < 8:
raise ValueError, "Invalid initialization option: %s" % (wbits,)
self.deflater = Deflater(level, wbits < 0 or self._gzip)
self.deflater.setStrategy(strategy)
self._ended = False
self._size = 0
self._crc32 = CRC32()
def compress(self, string):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
string = _to_input(string)
self.deflater.setInput(string, 0, len(string))
deflated = _get_deflate_data(self.deflater)
self._size += len(string)
self._crc32.update(string)
if self._gzip:
return self.GZIP_HEADER + deflated
else:
return deflated
def flush(self, mode=Z_FINISH):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
if mode not in _valid_flush_modes:
raise ValueError, "Invalid flush option"
if mode == Z_FINISH:
self.deflater.finish()
last = _get_deflate_data(self.deflater, mode)
if mode == Z_FINISH:
if self._gzip:
last += self.GZIP_TRAILER_FORMAT.pack(
self._crc32.getValue(), self._size & _MASK32)
self.deflater.end()
self._ended = True
return last
class compressobj(object):
# All jython uses wbits for is in deciding whether to skip the
# header if it's negative or to set gzip. But we still raise
# ValueError to get full test compliance.
GZIP_HEADER = "\x1f\x8b\x08\x00\x00\x00\x00\x00\x04\x03"
# NB: this format is little-endian, not big-endian as we might
# expect for network oriented protocols, as specified by RFCs;
# CRC32.getValue() returns an unsigned int as a long, so cope
# accordingly
GZIP_TRAILER_FORMAT = struct.Struct("<Ii") # crc32, size
def __init__(self, level=6, method=DEFLATED, wbits=MAX_WBITS,
memLevel=0, strategy=0):
if abs(wbits) & 16:
if wbits > 0:
wbits -= 16
else:
wbits += 16
self._gzip = True
else:
self._gzip = False
if abs(wbits) > MAX_WBITS or abs(wbits) < 8:
raise ValueError, "Invalid initialization option: %s" % (wbits,)
self.deflater = Deflater(level, wbits < 0 or self._gzip)
self.deflater.setStrategy(strategy)
self._ended = False
self._size = 0
self._crc32 = CRC32()
def compress(self, string):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
string = _to_input(string)
self.deflater.setInput(string, 0, len(string))
deflated = _get_deflate_data(self.deflater)
self._size += len(string)
self._crc32.update(string)
if self._gzip:
return self.GZIP_HEADER + deflated
else:
return deflated
def flush(self, mode=Z_FINISH):
if self._ended:
raise error("compressobj may not be used after flush(Z_FINISH)")
if mode not in _valid_flush_modes:
raise ValueError, "Invalid flush option"
if mode == Z_FINISH:
self.deflater.finish()
last = _get_deflate_data(self.deflater, mode)
if mode == Z_FINISH:
if self._gzip:
last += self.GZIP_TRAILER_FORMAT.pack(
self._crc32.getValue(), self._size % sys.maxint)
self.deflater.end()
self._ended = True
return last
def compress(string, level=6):
if level < Z_BEST_SPEED or level > Z_BEST_COMPRESSION:
raise error, "Bad compression level"
deflater = Deflater(level, 0)
try:
string = _to_input(string)
deflater.setInput(string, 0, len(string))
deflater.finish()
return _get_deflate_data(deflater)
finally:
deflater.end()
