Create direct write font proxy classes and unit tests.

content/child/dwrite_font_proxy/dwrite_localized_strings_win.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/child/dwrite_font_proxy/dwrite_localized_strings_win.h"
+
+#include "base/logging.h"
+
+namespace content {
+
+DWriteLocalizedStrings::DWriteLocalizedStrings() = default;
+
+DWriteLocalizedStrings::~DWriteLocalizedStrings() = default;
+
+HRESULT DWriteLocalizedStrings::FindLocaleName(const WCHAR* locale_name,
+                                               UINT32* index,
+                                               BOOL* exists) {
+  for (size_t n = 0; n < strings_.size(); ++n) {
+    if (_wcsicmp(strings_[n].first.data(), locale_name) == 0) {
+      *index = n;
+      *exists = TRUE;
+      return S_OK;
+    }
+  }
+
+  *index = UINT_MAX;
+  *exists = FALSE;
+  return S_OK;
+}
+
+UINT32 DWriteLocalizedStrings::GetCount() {
+  return strings_.size();
+}
+
+HRESULT DWriteLocalizedStrings::GetLocaleName(UINT32 index,
+                                              WCHAR* locale_name,
+                                              UINT32 size) {
+  if (index >= strings_.size())
+    return E_INVALIDARG;
+  // string16::size does not count the null terminator as part of the string,
+  // but GetLocaleName requires the caller to reserve space for the null
+  // terminator, so we need to ensure |size| is greater than the count of
+  // characters.
+  if (size <= strings_[index].first.size())
+    return E_INVALIDARG;
+  wcsncpy(locale_name, strings_[index].first.c_str(), size);
+  return S_OK;
+}
+
+HRESULT DWriteLocalizedStrings::GetLocaleNameLength(UINT32 index,
+                                                    UINT32* length) {
+  if (index >= strings_.size())
+    return E_INVALIDARG;
+  // Oddly, GetLocaleNameLength requires the length to not count the null
+  // terminator, even though GetLocaleName requires the output to be null
+  // terminated.
+  *length = strings_[index].first.size();
+  return S_OK;
+}
+
+HRESULT DWriteLocalizedStrings::GetString(UINT32 index,
+                                          WCHAR* string_buffer,
+                                          UINT32 size) {
+  if (index >= strings_.size())
+    return E_INVALIDARG;
+  // string16::size does not count the null terminator as part of the string,
+  // but GetString requires the caller to reserve space for the null terminator,
+  // so we need to ensure |size| is greater than the count of characters.
+  if (size <= strings_[index].second.size())
+    return E_INVALIDARG;
+  wcsncpy(string_buffer, strings_[index].second.c_str(), size);
+  return S_OK;
+}
+
+HRESULT DWriteLocalizedStrings::GetStringLength(UINT32 index, UINT32* length) {
+  if (index >= strings_.size())
+    return E_INVALIDARG;
+  // Oddly, GetStringLength requires the length to not count the null
+  // terminator, even though GetString requires the output to be null
+  // terminated.
+  *length = strings_[index].second.size();
+  return S_OK;
+}
+
+HRESULT DWriteLocalizedStrings::RuntimeClassInitialize(
+    std::vector<std::pair<base::string16, base::string16>>* strings) {
+  strings_.swap(*strings);
+  return S_OK;
+}
+
+}  // namespace content