Append crc32__examples

gil9red · gil9red · commit 3ad83de76c08 · 2018-05-12T17:47:09.000+05:00
diff --git a/crc32__examples/1.csv b/crc32__examples/1.csv
@@ -0,0 +1,3 @@
+123;
+456;
+789;
diff --git a/crc32__examples/2.csv b/crc32__examples/2.csv
@@ -0,0 +1,3 @@
+143;
+456;
+799;
diff --git a/crc32__examples/main.py b/crc32__examples/main.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+__author__ = 'ipetrash'
+
+
+import zlib
+
+
+def crc32_from_bytes(data: bytes) -> int:
+    return zlib.crc32(data) & 0xFFFFFFFF
+
+
+def crc32_hex_from_bytes(data: bytes) -> str:
+    return "%08X" % crc32_from_bytes(data)
+
+
+def crc32_hex_from_file(filename):
+    with open(filename, 'rb') as f:
+        buf = f.read()
+
+    return crc32_hex_from_bytes(buf)
+
+
+if __name__ == '__main__':
+    print(crc32_from_bytes(b'hello-world'))  # 2983461467
+    print(crc32_hex_from_bytes(b'hello-world'))  # B1D4025B
+    print()
+    print(crc32_hex_from_file('1.csv'))  # 7EB0F2B2
+    print(crc32_hex_from_file('2.csv'))  # 5D884C77
