def _init_read(self):
self.crc = zlib.crc32("") & 0xffffffffL
self.size = 0
python类crc32()的实例源码
def _add_read_data(self, data):
self.crc = zlib.crc32(data, self.crc) & 0xffffffffL
offset = self.offset - self.extrastart
self.extrabuf = self.extrabuf[offset:] + data
self.extrasize = self.extrasize + len(data)
self.extrastart = self.offset
self.size = self.size + len(data)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc) & 0xffffffffL
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def write_chunk(outfile, tag, data=strtobytes('')):
"""
Write a PNG chunk to the output file, including length and
checksum.
"""
# http://www.w3.org/TR/PNG/#5Chunk-layout
outfile.write(struct.pack("!I", len(data)))
tag = strtobytes(tag)
outfile.write(tag)
outfile.write(data)
checksum = zlib.crc32(tag)
checksum = zlib.crc32(data, checksum)
checksum &= 2**32-1
outfile.write(struct.pack("!I", checksum))
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def asciiCompress(data, level=9):
""" compress data to printable ascii-code """
code = zlib.compress(data,level)
csum = zlib.crc32(code)
code = base64.encodestring(code)
return code, csum
def update(self, block):
import zlib
self.crc = zlib.crc32(block, self.crc)
def encode_crc32(self, *, message : str):
'''Compute CRC32 checksum'''
await self.bot.embed_reply(zlib.crc32(message.encode("utf-8")))
def crc32(data, start=0):
return zlib.crc32(data, start)
def seqCrc32(seq, start=0):
for i in seq:
start = crc32(i, start)
return start
def update(self):
self.size = len(self.data)
self.crc = crc32(self.data)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def _hash_py_argv():
return zlib.crc32('\x00'.join(sys.argv[1:]))
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def write(self, s):
"""Write string s to the stream.
"""
if self.comptype == "gz":
self.crc = self.zlib.crc32(s, self.crc)
self.pos += len(s)
if self.comptype != "tar":
s = self.cmp.compress(s)
self.__write(s)
def pngCRC32(data):
return crc32(data) & 0xFFFFFFFF
def write_chunk(outfile, tag, data=strtobytes('')):
"""
Write a PNG chunk to the output file, including length and
checksum.
"""
# http://www.w3.org/TR/PNG/#5Chunk-layout
outfile.write(struct.pack("!I", len(data)))
tag = strtobytes(tag)
outfile.write(tag)
outfile.write(data)
checksum = zlib.crc32(tag)
checksum = zlib.crc32(data, checksum)
checksum &= 2**32-1
outfile.write(struct.pack("!I", checksum))
