externals: Update zydis to 4.0.0

Merge commit '6fa8d51479e9a5542c67bec715a1f68e7ed057ba'

externals/zydis/tests/binary_reader.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+from struct import unpack
+
+
+class BinaryReader(object):
+
+    def __init__(self, data):
+        self.data = data
+        self.cursor = 0
+
+    def _check_eof(self, size):
+        if self.cursor + size > len(self.data):
+            raise EOFError('Attempted to read past the end of internal data buffer')
+
+    def _read_internal(self, fmt, size):
+        self._check_eof(size)
+        data_to_unpack = self.data[self.cursor:self.cursor + size]
+        self.cursor += size
+        return unpack(fmt, data_to_unpack)[0]
+
+    def read_uint8(self):
+        return self._read_internal('<B', 1)
+
+    def read_uint16(self):
+        return self._read_internal('<H', 2)
+
+    def read_uint32(self):
+        return self._read_internal('<L', 4)
+
+    def read_uint64(self):
+        return self._read_internal('<Q', 8)
+
+    def read_int8(self):
+        return self._read_internal('<b', 1)
+
+    def read_int16(self):
+        return self._read_internal('<h', 2)
+
+    def read_int32(self):
+        return self._read_internal('<l', 4)
+
+    def read_int64(self):
+        return self._read_internal('<q', 8)
+
+    def read_bytes(self, size=-1):
+        if size < 0:
+            data = self.data[self.cursor:]
+        else:
+            self._check_eof(size)
+            data = self.data[self.cursor:self.cursor + size]
+
+        self.cursor += len(data)
+        return data