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use struct instead of bit-manipulate in Python

This commit is contained in:
Jeremy Hylton 1999-03-23 23:05:34 +00:00
parent 8ad22c8153
commit c19f9972a1
1 changed files with 3 additions and 21 deletions
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24
Lib/gzip.py
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@ -1,6 +1,7 @@
import time
import string
import zlib
import struct
import __builtin__
# implements a python function that reads and writes a gzipped file
@ -14,29 +15,10 @@ FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16
READ, WRITE = 1, 2
def write32(output, value):
t = divmod(value, 256)
b1 = chr(t[1])
t = divmod(t[0], 256)
b2 = chr(t[1])
t = divmod(t[0], 256)
b3 = chr(t[1])
t = divmod(t[0], 256)
b4 = chr(t[1])
buf = b1 + b2 + b3 + b4
output.write(buf)
output.write(struct.pack("<l", value))
def read32(input):
buf = input.read(4)
v = ord(buf[0])
v = v + (ord(buf[1]) << 8)
v = v + (ord(buf[2]) << 16)
v = v + (ord(buf[3]) << 24)
return v
return struct.unpack("<l", input.read(4))[0]
def open(filename, mode="r", compresslevel=9):
return GzipFile(filename, mode, compresslevel)