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projecten1/lib/python3.6/site-packages/PIL/_binary.py

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+#
+# The Python Imaging Library.
+# $Id$
+#
+# Binary input/output support routines.
+#
+# Copyright (c) 1997-2003 by Secret Labs AB
+# Copyright (c) 1995-2003 by Fredrik Lundh
+# Copyright (c) 2012 by Brian Crowell
+#
+# See the README file for information on usage and redistribution.
+#
+
+from struct import unpack_from, pack
+from ._util import py3
+
+if py3:
+    def i8(c):
+        return c if c.__class__ is int else c[0]
+
+    def o8(i):
+        return bytes((i & 255,))
+else:
+    def i8(c):
+        return ord(c)
+
+    def o8(i):
+        return chr(i & 255)
+
+
+# Input, le = little endian, be = big endian
+def i16le(c, o=0):
+    """
+    Converts a 2-bytes (16 bits) string to an unsigned integer.
+
+    c: string containing bytes to convert
+    o: offset of bytes to convert in string
+    """
+    return unpack_from("<H", c, o)[0]
+
+
+def si16le(c, o=0):
+    """
+    Converts a 2-bytes (16 bits) string to a signed integer.
+
+    c: string containing bytes to convert
+    o: offset of bytes to convert in string
+    """
+    return unpack_from("<h", c, o)[0]
+
+
+def i32le(c, o=0):
+    """
+    Converts a 4-bytes (32 bits) string to an unsigned integer.
+
+    c: string containing bytes to convert
+    o: offset of bytes to convert in string
+    """
+    return unpack_from("<I", c, o)[0]
+
+
+def si32le(c, o=0):
+    """
+    Converts a 4-bytes (32 bits) string to a signed integer.
+
+    c: string containing bytes to convert
+    o: offset of bytes to convert in string
+    """
+    return unpack_from("<i", c, o)[0]
+
+
+def i16be(c, o=0):
+    return unpack_from(">H", c, o)[0]
+
+
+def i32be(c, o=0):
+    return unpack_from(">I", c, o)[0]
+
+
+# Output, le = little endian, be = big endian
+def o16le(i):
+    return pack("<H", i)
+
+
+def o32le(i):
+    return pack("<I", i)
+
+
+def o16be(i):
+    return pack(">H", i)
+
+
+def o32be(i):
+    return pack(">I", i)