* Added breakpad support for Linux.

thirdparty/breakpad/common/mac/macho_walker.h

@@ -0,0 +1,110 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// macho_walker.h: Iterate over the load commands in a mach-o file
+//
+// Author: Dan Waylonis
+
+#ifndef COMMON_MAC_MACHO_WALKER_H__
+#define COMMON_MAC_MACHO_WALKER_H__
+
+#include <mach-o/loader.h>
+#include <sys/types.h>
+
+namespace MacFileUtilities {
+
+class MachoWalker {
+ public:
+  // A callback function executed when a new load command is read.  If no
+  // further processing of load commands is desired, return false.  Otherwise,
+  // return true.
+  // |cmd| is the current command, and |offset| is the location relative to the
+  // beginning of the file (not header) where the command was read.  If |swap|
+  // is set, then any command data (other than the returned load_command) should
+  // be swapped when read
+  typedef bool (*LoadCommandCallback)(MachoWalker *walker, load_command *cmd,
+                                      off_t offset, bool swap, void *context);
+
+  MachoWalker(const char *path, LoadCommandCallback callback, void *context);
+  MachoWalker(int file_descriptor, LoadCommandCallback callback, void *context);
+  ~MachoWalker();
+
+  // Begin walking the header for |cpu_type|.  If |cpu_type| is 0, then the
+  // native cpu type is used.  Otherwise, accepted values are listed in
+  // /usr/include/mach/machine.h (e.g., CPU_TYPE_X86 or CPU_TYPE_POWERPC).
+  // Returns false if opening the file failed or if the |cpu_type| is not
+  // present in the file.
+  bool WalkHeader(int cpu_type);
+
+  // Locate (if any) the header offset for |cpu_type| and return in |offset|.
+  // Return true if found, false otherwise.
+  bool FindHeader(int cpu_type, off_t &offset);
+
+  // Read |size| bytes from the opened file at |offset| into |buffer|
+  bool ReadBytes(void *buffer, size_t size, off_t offset);
+  
+  // Return the current header and header offset
+  bool CurrentHeader(struct mach_header_64 *header, off_t *offset);
+
+ private:
+  // Validate the |cpu_type|
+  int ValidateCPUType(int cpu_type);
+
+  // Process an individual header starting at |offset| from the start of the
+  // file.  Return true if successful, false otherwise.
+  bool WalkHeaderAtOffset(off_t offset);
+  bool WalkHeader64AtOffset(off_t offset);
+
+  // Bottleneck for walking the load commands
+  bool WalkHeaderCore(off_t offset, uint32_t number_of_commands, bool swap);
+
+  // File descriptor to the opened file
+  int file_;
+
+  // User specified callback & context
+  LoadCommandCallback callback_;
+  void *callback_context_;
+  
+  // Current header, size, and offset.  The mach_header_64 is used for both
+  // 32-bit and 64-bit headers because they only differ in their last field
+  // (reserved).  By adding the |current_header_size_| and the 
+  // |current_header_offset_|, you can determine the offset in the file just
+  // after the header.
+  struct mach_header_64 *current_header_;
+  unsigned long current_header_size_;
+  off_t current_header_offset_;
+  
+ private:
+  MachoWalker(const MachoWalker &);
+  MachoWalker &operator=(const MachoWalker &);
+};
+
+}  // namespace MacFileUtilities
+
+#endif  // COMMON_MAC_MACHO_WALKER_H__