novidia: add shader.farc xdelta/vcdiff patching

source-code/dependencies/xdelta3/testing/cmp.h

@@ -0,0 +1,67 @@
+/* xdelta3 - delta compression tools and library -*- Mode: C++ -*-
+   Copyright 2016 Joshua MacDonald
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+static size_t CmpDifferentBlockBytes(const Block &a, const Block &b) {
+  size_t total = 0;
+  size_t i = 0; 
+  size_t m = min(a.Size(), b.Size());
+
+  for (; i < m; i++) {
+    if (a[i] != b[i]) {
+      total++;
+    }
+  }
+
+  total += a.Size() - i;
+  total += b.Size() - i;
+
+  return total;
+}
+
+static xoff_t CmpDifferentBytes(const FileSpec &a, const FileSpec &b) {
+  Block block_a, block_b;
+  xoff_t total = 0;
+  typename FileSpec::iterator a_i(a), b_i(b);
+
+  for (; !a_i.Done() && !b_i.Done(); a_i.Next(), b_i.Next()) {
+
+    a_i.Get(&block_a);
+    b_i.Get(&block_b);
+
+    total += CmpDifferentBlockBytes(block_a, block_b);
+  }
+
+  for (; !a_i.Done(); a_i.Next()) {
+    total += a_i.BytesOnBlock();
+  }
+  for (; !b_i.Done(); b_i.Next()) {
+    total += b_i.BytesOnBlock();
+  }
+
+  return total;
+}
+
+static size_t CmpDifferentBlockBytesAtOffset(const Block &a,
+					     const FileSpec &b_spec,
+					     xoff_t offset) {
+  Block b;
+  size_t size = a.Size();
+  CHECK_LE(offset, b_spec.Size());
+  if (b_spec.Size() < offset + size) {
+    size = b_spec.Size() - offset;
+  }
+  b_spec.Get(&b, offset, size);
+  return CmpDifferentBlockBytes(a, b);
+}