x264 source for verification 2026-05-22

tools/digress/comparers.py

@@ -0,0 +1,68 @@
+"""
+Digress comparers.
+"""
+
+from digress.errors import ComparisonError
+
+import os
+from itertools import imap, izip
+
+def compare_direct(value_a, value_b):
+    if value_a != value_b:
+        raise ComparisonError("%s is not %s" % (value_a, value_b))
+
+def compare_pass(value_a, value_b):
+    """
+    Always true, as long as the test is passed.
+    """
+
+def compare_tolerance(tolerance):
+    def _compare_tolerance(value_a, value_b):
+        if abs(value_a - value_b) > tolerance:
+            raise ComparisonError("%s is not %s (tolerance: %s)" % (
+                value_a,
+                value_b,
+                tolerance
+            ))
+    return _compare_tolerance
+
+def compare_files(file_a, file_b):
+    size_a = os.path.getsize(file_a)
+    size_b = os.path.getsize(file_b)
+
+    print file_a, file_b
+
+    if size_a != size_b:
+        raise ComparisonError("%s is not the same size as %s" % (
+            file_a,
+            file_b
+        ))
+
+    BUFFER_SIZE = 8196
+
+    offset = 0
+
+    with open(file_a) as f_a:
+        with open(file_b) as f_b:
+            for chunk_a, chunk_b in izip(
+                imap(
+                    lambda i: f_a.read(BUFFER_SIZE),
+                    xrange(size_a // BUFFER_SIZE + 1)
+                ),
+                imap(
+                    lambda i: f_b.read(BUFFER_SIZE),
+                    xrange(size_b // BUFFER_SIZE + 1)
+                )
+            ):
+                chunk_size = len(chunk_a)
+
+                if chunk_a != chunk_b:
+                    for i in xrange(chunk_size):
+                        if chunk_a[i] != chunk_b[i]:
+                            raise ComparisonError("%s differs from %s at offset %d" % (
+                                file_a,
+                                file_b,
+                                offset + i
+                            ))
+
+                offset += chunk_size