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third_party/crashpad/crashpad/minidump/minidump_string_writer.h

Index: third_party/crashpad/crashpad/minidump/minidump_string_writer.h
diff --git a/third_party/crashpad/crashpad/minidump/minidump_string_writer.h b/third_party/crashpad/crashpad/minidump/minidump_string_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_STRING_WRITER_H_
+#define CRASHPAD_MINIDUMP_MINIDUMP_STRING_WRITER_H_
+
+#include <windows.h>
+#include <dbghelp.h>
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+#include "minidump/minidump_extensions.h"
+#include "minidump/minidump_rva_list_writer.h"
+#include "minidump/minidump_writable.h"
+
+namespace crashpad {
+namespace internal {
+
+//! \cond
+
+struct MinidumpStringWriterUTF16Traits {
+  using StringType = base::string16;
+  using MinidumpStringType = MINIDUMP_STRING;
+};
+
+struct MinidumpStringWriterUTF8Traits {
+  using StringType = std::string;
+  using MinidumpStringType = MinidumpUTF8String;
+};
+
+//! \endcond
+
+//! \brief Writes a variable-length string to a minidump file in accordance with
+//!     the string type’s characteristics.
+//!
+//! MinidumpStringWriter objects should not be instantiated directly. To write
+//! strings to minidump file, use the MinidumpUTF16StringWriter and
+//! MinidumpUTF8StringWriter subclasses instead.
+template <typename Traits>
+class MinidumpStringWriter : public MinidumpWritable {
+ public:
+  MinidumpStringWriter();
+  ~MinidumpStringWriter() override;
+
+ protected:
+  using MinidumpStringType = typename Traits::MinidumpStringType;
+  using StringType = typename Traits::StringType;
+
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
+
+  //! \brief Sets the string to be written.
+  //!
+  //! \note Valid in #kStateMutable.
+  void set_string(const StringType& string) { string_.assign(string); }
+
+  //! \brief Retrieves the string to be written.
+  //!
+  //! \note Valid in any state.
+  const StringType& string() const { return string_; }
+
+ private:
+  scoped_ptr<MinidumpStringType> string_base_;
+  StringType string_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpStringWriter);
+};
+
+//! \brief Writes a variable-length UTF-16-encoded MINIDUMP_STRING to a minidump
+//!     file.
+//!
+//! MinidumpUTF16StringWriter objects should not be instantiated directly
+//! outside of the MinidumpWritable family of classes.
+class MinidumpUTF16StringWriter final
+    : public MinidumpStringWriter<MinidumpStringWriterUTF16Traits> {
+ public:
+  MinidumpUTF16StringWriter() : MinidumpStringWriter() {}
+  ~MinidumpUTF16StringWriter() override;
+
+  //! \brief Converts a UTF-8 string to UTF-16 and sets it as the string to be
+  //!     written.
+  //!
+  //! \note Valid in #kStateMutable.
+  void SetUTF8(const std::string& string_utf8);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MinidumpUTF16StringWriter);
+};
+
+//! \brief Writes a variable-length UTF-8-encoded MinidumpUTF8String to a
+//!     minidump file.
+//!
+//! MinidumpUTF8StringWriter objects should not be instantiated directly outside
+//! of the MinidumpWritable family of classes.
+class MinidumpUTF8StringWriter final
+    : public MinidumpStringWriter<MinidumpStringWriterUTF8Traits> {
+ public:
+  MinidumpUTF8StringWriter() : MinidumpStringWriter() {}
+  ~MinidumpUTF8StringWriter() override;
+
+  //! \brief Sets the string to be written.
+  //!
+  //! \note Valid in #kStateMutable.
+  void SetUTF8(const std::string& string_utf8) { set_string(string_utf8); }
+
+  //! \brief Retrieves the string to be written.
+  //!
+  //! \note Valid in any state.
+  const std::string& UTF8() const { return string(); }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MinidumpUTF8StringWriter);
+};
+
+//! \brief The writer for a MinidumpRVAList object in a minidump file,
+//!     containing a list of \a MinidumpStringWriterType objects.
+template <typename MinidumpStringWriterType>
+class MinidumpStringListWriter final : public MinidumpRVAListWriter {
+ public:
+  MinidumpStringListWriter();
+  ~MinidumpStringListWriter() override;
+
+  //! \brief Adds a new \a Traits::MinidumpStringWriterType for each element in
+  //!     \a vector to the MinidumpRVAList.
+  //!
+  //! \param[in] vector The vector to use as source data. Each string in the
+  //!     vector is treated as a UTF-8 string, and a new string writer will be
+  //!     created for each one and made a child of the MinidumpStringListWriter.
+  //!
+  //! \note Valid in #kStateMutable. No mutator methods may be called before
+  //!     this method, and it is not normally necessary to call any mutator
+  //!     methods after this method.
+  void InitializeFromVector(const std::vector<std::string>& vector);
+
+  //! \brief Creates a new \a Traits::MinidumpStringWriterType object and adds
+  //!     it to the MinidumpRVAList.
+  //!
+  //! This object creates a new string writer with string value \a string_utf8,
+  //! takes ownership of it, and becomes its parent in the overall tree of
+  //! MinidumpWritable objects.
+  //!
+  //! \note Valid in #kStateMutable.
+  void AddStringUTF8(const std::string& string_utf8);
+
+  //! \brief Determines whether the object is useful.
+  //!
+  //! A useful object is one that carries data that makes a meaningful
+  //! contribution to a minidump file. An object carrying entries would be
+  //! considered useful.
+  //!
+  //! \return `true` if the object is useful, `false` otherwise.
+  bool IsUseful() const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MinidumpStringListWriter);
+};
+
+}  // namespace internal
+
+using MinidumpUTF16StringListWriter = internal::MinidumpStringListWriter<
+    internal::MinidumpUTF16StringWriter>;
+using MinidumpUTF8StringListWriter = internal::MinidumpStringListWriter<
+    internal::MinidumpUTF8StringWriter>;
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_MINIDUMP_MINIDUMP_STRING_WRITER_H_