Add MinidumpSimpleStringDictionaryWriter and its test

minidump/minidump_simple_string_dictionary_writer.h

Index: minidump/minidump_simple_string_dictionary_writer.h
diff --git a/minidump/minidump_simple_string_dictionary_writer.h b/minidump/minidump_simple_string_dictionary_writer.h
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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.
+
+#ifndef CRASHPAD_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_WRITER_H_
+#define CRASHPAD_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_WRITER_H_
+
+#include <sys/types.h>
+
+#include <string>
+#include <map>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "minidump/minidump_extensions.h"
+#include "minidump/minidump_string_writer.h"
+#include "minidump/minidump_writable.h"
+#include "util/file/file_writer.h"
+
+namespace crashpad {
+
+//! \brief The writer for a MinidumpSimpleStringDictionaryEntry object in a
+//!     minidump file.
+//!
+//! Because MinidumpSimpleStringDictionaryEntry objects only appear as elements
+//! of MinidumpSimpleStringDictionary objects, this class does not write any
+//! data on its own. It makes its MinidumpSimpleStringDictionaryEntry data
+//! available to its MinidumpSimpleStringDictionaryWriter parent, which writes
+//! it as part of a MinidumpSimpleStringDictionary.
+class MinidumpSimpleStringDictionaryEntryWriter final
+    : public internal::MinidumpWritable {
+ public:
+  MinidumpSimpleStringDictionaryEntryWriter();
+  ~MinidumpSimpleStringDictionaryEntryWriter();
+
+  //! \brief Returns a MinidumpSimpleStringDictionaryEntry referencing this
+  //!     object’s data.
+  //!
+  //! This method is expected to be called by a
+  //! MinidumpSimpleStringDictionaryWriter in order to obtain a
+  //! MinidumpSimpleStringDictionaryEntry to include in its list.
+  //!
+  //! \note Valid in #kStateWritable.
+  const MinidumpSimpleStringDictionaryEntry*
+      MinidumpSimpleStringDictionaryEntry() const;
+
+  //! \brief Sets the strings to be written as the entry object’s key and value.
+  //!
+  //! \note Valid in #kStateMutable.
+  void SetKeyValue(const std::string& key, const std::string& value);
+
+  //! \brief Retrieves the key to be written.
+  //!
+  //! \note Valid in any state.
+  const std::string& Key() const { return key_.UTF8(); }
+
+ protected:
+  // MinidumpWritable:
+
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
+
+ private:
+  struct MinidumpSimpleStringDictionaryEntry entry_;
+  internal::MinidumpUTF8StringWriter key_;
+  internal::MinidumpUTF8StringWriter value_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpSimpleStringDictionaryEntryWriter);
+};
+
+//! \brief The writer for a MinidumpSimpleStringDictionary object in a minidump
+//!     file, containing a list of MinidumpSimpleStringDictionaryEntry objects.
+//!
+//! Because this class writes a representatin of a dictionary, the order of
+//! entries is insignificant. Entries may be written in any order.
+class MinidumpSimpleStringDictionaryWriter final
+    : public internal::MinidumpWritable {
+ public:
+  MinidumpSimpleStringDictionaryWriter();
+  ~MinidumpSimpleStringDictionaryWriter();
+
+  //! \brief Adds a MinidumpSimpleStringDictionaryEntryWriter to the
+  //!     MinidumpSimpleStringDictionary.
+  //!
+  //! \a entry will become a child of this object in the overall tree of
+  //! internal::MinidumpWritable objects.
+  //!
+  //! If the key contained in \a entry duplicates the key of an entry already
+  //! present in the MinidumpSimpleStringDictionary, the new \a entry will
+  //! replace the previous one.
+  //!
+  //! \note Valid in #kStateMutable.
+  void AddEntry(MinidumpSimpleStringDictionaryEntryWriter* entry);
+
+ protected:
+  // MinidumpWritable:
+
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
+
+ private:
+  MinidumpSimpleStringDictionary simple_string_dictionary_base_;
+  std::map<std::string, MinidumpSimpleStringDictionaryEntryWriter*>
+      entries_;  // weak
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpSimpleStringDictionaryWriter);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_WRITER_H_