2016 Update

Task/CRC-32/Python/crc-32-1.py

@@ -1,3 +1,8 @@
+>>> s = 'The quick brown fox jumps over the lazy dog'
 >>> import zlib
->>> hex(zlib.crc32('The quick brown fox jumps over the lazy dog'))
+>>> hex(zlib.crc32(s))
+'0x414fa339'
+
+>>> import binascii
+>>> hex(binascii.crc32(s))
 '0x414fa339'

Task/CRC-32/Python/crc-32-2.py

@@ -1,3 +1,19 @@
->>> import binascii
->>> hex(binascii.crc32('The quick brown fox jumps over the lazy dog'))
-'0x414fa339'
+def create_table():
+    a = []
+    for i in range(256):
+        k = i
+        for j in range(8):
+            if k & 1:
+                k ^= 0x1db710640
+            k >>= 1
+        a.append(k)
+    return a
+
+def crc_update(buf, crc):
+    crc ^= 0xffffffff
+    for k in buf:
+        crc = (crc >> 8) ^ crc_table[(crc & 0xff) ^ k]
+    return crc ^ 0xffffffff
+
+crc_table = create_table()
+print(hex(crc_update(b"The quick brown fox jumps over the lazy dog", 0)))