Introduce MinidumpStringWriter and its test

minidump/minidump_writer_util.cc

Index: minidump/minidump_writer_util.cc
diff --git a/minidump/minidump_writer_util.cc b/minidump/minidump_writer_util.cc
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+++ b/minidump/minidump_writer_util.cc
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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.
+
+#include "minidump/minidump_writer_util.h"
+
+#include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "util/stdlib/strlcpy.h"
+
+namespace crashpad {
+namespace internal {
+
+// static
+void MinidumpWriterUtil::AssignTimeT(uint32_t* destination, time_t source) {
+  if (!base::IsValueInRangeForNumericType<uint32_t>(source)) {
+    LOG(WARNING) << "timestamp " << source << " out of range";
+  }
+
+  *destination = source;
+}
+
+// static
+string16 MinidumpWriterUtil::ConvertUTF8ToUTF16(const std::string& utf8) {
+  string16 utf16;
+  if (!base::UTF8ToUTF16(utf8.data(), utf8.length(), &utf16)) {
+    LOG(WARNING) << "string " << utf8
+                 << " cannot be converted to UTF-16 losslessly";
+  }
+  return utf16;
+}
+
+// static
+void MinidumpWriterUtil::AssignUTF8ToUTF16(char16* destination,
+                                           size_t destination_size,
+                                           const std::string& source) {
+  string16 source_utf16 = ConvertUTF8ToUTF16(source);
+  if (source_utf16.size() > destination_size - 1) {
+    LOG(WARNING) << "string " << source << " UTF-16 length "
+                 << source_utf16.size()
+                 << " will be truncated to UTF-16 length "
+                 << destination_size - 1;
+  }
+
+  source_utf16.resize(destination_size - 1);
+  c16lcpy(destination, source_utf16.c_str(), destination_size);
+}
+
+}  // namespace internal
+}  // namespace crashpad