pylibfdt: add Property.as_*int*_array()

Add new methods to handle decoding of int32, uint32, int64 and uint64
arrays.

Also add tests for the new methods.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Message-Id: <20211225132558.167123-3-luca@z3ntu.xyz>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pylibfdt/libfdt.i

@@ -716,6 +716,21 @@ class Property(bytearray):
     def as_int64(self):
         return self.as_cell('q')
 
+    def as_list(self, fmt):
+        return list(map(lambda x: x[0], struct.iter_unpack('>' + fmt, self)))
+
+    def as_uint32_list(self):
+        return self.as_list('L')
+
+    def as_int32_list(self):
+        return self.as_list('l')
+
+    def as_uint64_list(self):
+        return self.as_list('Q')
+
+    def as_int64_list(self):
+        return self.as_list('q')
+
     def as_str(self):
         """Unicode is supported by decoding from UTF-8"""
         if self[-1] != 0:

tests/pylibfdt_tests.py

@@ -382,6 +382,17 @@ class PyLibfdtBasicTests(unittest.TestCase):
                           self.get_prop("prop-uint64").as_uint64())
         self.assertEqual(-2, self.get_prop("prop-int64").as_int64())
 
+    def testGetIntListProperties(self):
+        """Test that we can access properties as integer lists"""
+        self.assertEqual([128, -16, -2],
+                         self.get_prop("prop-int32-array").as_int32_list())
+        self.assertEqual([0x1, 0x98765432, 0xdeadbeef],
+                         self.get_prop("prop-uint32-array").as_uint32_list())
+        self.assertEqual([0x100000000, -2],
+                         self.get_prop("prop-int64-array").as_int64_list())
+        self.assertEqual([0x100000000, 0x1],
+                         self.get_prop("prop-uint64-array").as_uint64_list())
+
     def testGetStringlistProperties(self):
         """Test that we can access properties as string list"""
         node = self.fdt.path_offset('/subnode@1/subsubnode')

tests/test_props.dts

@@ -8,4 +8,8 @@
 	prop-hex64 = /bits/ 64 <0xdeadbeef01abcdef>;
 	prop-uint64 = /bits/ 64 <9223372036854775807>;
 	prop-int64 = /bits/ 64 <0xfffffffffffffffe>;
+	prop-int32-array = <128>, <(-16)>, <0xfffffffe>;
+	prop-uint32-array = <0x1>, <0x98765432>, <0xdeadbeef>;
+	prop-int64-array = /bits/ 64 <0x100000000 0xfffffffffffffffe>;
+	prop-uint64-array = /bits/ 64 <0x100000000 0x1>;
 };