1 files changed, 66 insertions, 0 deletions
diff --git a/security/sandbox/chromium-shim/sandbox/win/src/line_break_policy.cc b/security/sandbox/chromium-shim/sandbox/win/src/line_break_policy.cc
new file mode 100644
index 0000000000..5533232643
--- /dev/null
+++ b/security/sandbox/chromium-shim/sandbox/win/src/line_break_policy.cc
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "sandbox/win/src/line_break_policy.h"
+
+#include <algorithm>
+#include <array>
+#include <usp10.h>
+
+#include "sandbox/win/src/ipc_tags.h"
+#include "sandbox/win/src/line_break_common.h"
+#include "sandbox/win/src/policy_engine_opcodes.h"
+#include "sandbox/win/src/policy_params.h"
+
+namespace sandbox {
+
+bool LineBreakPolicy::GenerateRules(const wchar_t* null,
+                                    TargetPolicy::Semantics semantics,
+                                    LowLevelPolicy* policy) {
+  if (TargetPolicy::LINE_BREAK_ALLOW != semantics) {
+    return false;
+  }
+
+  PolicyRule line_break_rule(ASK_BROKER);
+  if (!policy->AddRule(IpcTag::GETCOMPLEXLINEBREAKS, &line_break_rule)) {
+    return false;
+  }
+  return true;
+}
+
+/* static */ DWORD LineBreakPolicy::GetComplexLineBreaksProxyAction(
+    EvalResult eval_result, const wchar_t* text, uint32_t length,
+    uint8_t* break_before) {
+  // The only action supported is ASK_BROKER which means call the line breaker.
+  if (ASK_BROKER != eval_result) {
+    return ERROR_ACCESS_DENIED;
+  }
+
+  int outItems = 0;
+  std::array<SCRIPT_ITEM, kMaxBrokeredLen + 1> items;
+  HRESULT result = ::ScriptItemize(text, length, kMaxBrokeredLen, nullptr,
+                                   nullptr, items.data(), &outItems);
+  if (result != 0) {
+    return ERROR_ACCESS_DENIED;
+  }
+
+  std::array<SCRIPT_LOGATTR, kMaxBrokeredLen> slas;
+  for (int iItem = 0; iItem < outItems; ++iItem) {
+    uint32_t endOffset = items[iItem + 1].iCharPos;
+    uint32_t startOffset = items[iItem].iCharPos;
+    if (FAILED(::ScriptBreak(text + startOffset, endOffset - startOffset,
+                             &items[iItem].a, &slas[startOffset]))) {
+      return ERROR_ACCESS_DENIED;
+    }
+  }
+
+  std::transform(slas.data(), slas.data() + length, break_before,
+                 [](const SCRIPT_LOGATTR& sla) { return sla.fSoftBreak; });
+
+  return ERROR_SUCCESS;
+}
+
+}  // namespace sandbox