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snapshot/win/process_subrange_reader.h

Index: snapshot/win/process_subrange_reader.h
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+// Copyright 2015 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_SNAPSHOT_WIN_PROCESS_SUBRANGE_READER_WIN_H_
+#define CRASHPAD_SNAPSHOT_WIN_PROCESS_SUBRANGE_READER_WIN_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "util/misc/initialization_state_dcheck.h"
+#include "util/win/address_types.h"
+#include "util/win/checked_win_address_range.h"
+
+namespace crashpad {
+
+class ProcessReaderWin;
+
+//! \brief A wrapper for ProcessReaderWin that only allows a specific subrange
+//!     to be read from.
+//!
+//! This class is useful to restrict reads to a specific address range, such as
+//! the address range occupied by a loaded module, or a specific section within
+//! a module.
+class ProcessSubrangeReader {
+ public:
+  ProcessSubrangeReader();
+  ~ProcessSubrangeReader();
+
+  //! \brief Initializes the object.
+  //!
+  //! \param[in] process_reader A reader for a remote process.
+  //! \param[in] base The base address for the range that reads should be
+  //!     restricted to.
+  //! \param[in] size The size of the range that reads should be restricted to.
+  //! \param[in] name The range’s name, a string to be used in logged messages.
+  //!     This string is for diagnostic purposes.
+  //!
+  //! \return `true` on success, `false` on failure with a message logged. The
+  //!     other methods in this class must not be called unless this method or
+  //!     InitializeSubrange() has returned true.
+  bool Initialize(ProcessReaderWin* process_reader,
+                  WinVMAddress base,
+                  WinVMSize size,
+                  const std::string& name);
+
+  //! \brief Initializes the object to a subrange of an existing
+  //!     ProcessSubrangeReader.
+  //!
+  //! The subrange identified by \a base and \a size must be contained within
+  //! the subrange in \a that.
+  //!
+  //! \param[in] that The existing ProcessSubrangeReader to base the new object
+  //!     on.
+  //! \param[in] base The base address for the range that reads should be
+  //!     restricted to.
+  //! \param[in] size The size of the range that reads should be restricted to.
+  //! \param[in] sub_name A description of the subrange, which will be appended
+  //!     to the \a name in \a that and used in logged messages. This string is
+  //!     for diagnostic purposes.
+  //!
+  //! \return `true` on success, `false` on failure with a message logged. The
+  //!     other methods in this class must not be called unless this method or
+  //!     Initialize() has returned true.
+  bool InitializeSubrange(const ProcessSubrangeReader& that,
+                          WinVMAddress base,
+                          WinVMSize size,
+                          const std::string& sub_name);
+
+  bool Is64Bit() const { return range_.Is64Bit(); }
+  WinVMAddress Base() const { return range_.Base(); }
+  WinVMAddress Size() const { return range_.Size(); }
+  const std::string& name() const { return name_; }
+
+  //! \brief Reads memory from the remote process.
+  //!
+  //! The range specified by \a address and \a size must be contained within
+  //! the range that this object is permitted to read.
+  //!
+  //! \param[in] address The address to read from.
+  //! \param[in] size The size of data to read, in bytes.
+  //! \param[out] into The buffer to read data into.
+  //!
+  //! \return `true` on success, `false` on failure with a message logged.
+  bool ReadMemory(WinVMAddress address, WinVMSize size, void* into) const;
+
+ private:
+  // Common helper for Initialize() and InitializeSubrange().
+  bool InitializeInternal(ProcessReaderWin* process_reader,
+                          WinVMAddress base,
+                          WinVMSize size,
+                          const std::string& name);
+
+  std::string name_;
+  CheckedWinAddressRange range_;
+  ProcessReaderWin* process_reader_;  // weak
+  InitializationStateDcheck initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessSubrangeReader);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_WIN_PROCESS_SUBRANGE_READER_WIN_H_