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diff --git a/externals/breakpad/src/common/mac/macho_walker.cc b/externals/breakpad/src/common/mac/macho_walker.cc
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+++ b/externals/breakpad/src/common/mac/macho_walker.cc
@@ -0,0 +1,270 @@
+// Copyright 2006 Google LLC
+//
+// 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 LLC 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.cc: Iterate over the load commands in a mach-o file
+//
+// See macho_walker.h for documentation
+//
+// Author: Dan Waylonis
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include <assert.h>
+#include <fcntl.h>
+#include <mach-o/fat.h>
+#include <mach-o/loader.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common/mac/arch_utilities.h"
+#include "common/mac/byteswap.h"
+#include "common/mac/macho_utilities.h"
+#include "common/mac/macho_walker.h"
+
+namespace MacFileUtilities {
+
+MachoWalker::MachoWalker(const char* path, LoadCommandCallback callback,
+                         void* context)
+    : file_(-1),
+      memory_(NULL),
+      memory_size_(0),
+      callback_(callback),
+      callback_context_(context),
+      current_header_(NULL),
+      current_header_size_(0),
+      current_header_offset_(0) {
+  file_ = open(path, O_RDONLY);
+}
+
+MachoWalker::MachoWalker(void* memory, size_t size,
+                         LoadCommandCallback callback, void* context)
+    : file_(-1),
+      memory_(memory),
+      memory_size_(size),
+      callback_(callback),
+      callback_context_(context),
+      current_header_(NULL),
+      current_header_size_(0),
+      current_header_offset_(0) {
+}
+
+MachoWalker::~MachoWalker() {
+  if (file_ != -1)
+    close(file_);
+}
+
+bool MachoWalker::WalkHeader(cpu_type_t cpu_type, cpu_subtype_t cpu_subtype) {
+  cpu_type_t valid_cpu_type = cpu_type;
+  cpu_subtype_t valid_cpu_subtype = cpu_subtype;
+  // if |cpu_type| is 0, use the native cpu type.
+  if (cpu_type == 0) {
+    ArchInfo arch = GetLocalArchInfo();
+    valid_cpu_type = arch.cputype;
+    valid_cpu_subtype = CPU_SUBTYPE_MULTIPLE;
+  }
+  off_t offset;
+  if (FindHeader(valid_cpu_type, valid_cpu_subtype, offset)) {
+    if (cpu_type & CPU_ARCH_ABI64)
+      return WalkHeader64AtOffset(offset);
+
+    return WalkHeaderAtOffset(offset);
+  }
+
+  return false;
+}
+
+bool MachoWalker::ReadBytes(void* buffer, size_t size, off_t offset) {
+  if (memory_) {
+    if (offset < 0)
+      return false;
+    bool result = true;
+    if (offset + size > memory_size_) {
+      if (static_cast<size_t>(offset) >= memory_size_)
+        return false;
+      size = memory_size_ - static_cast<size_t>(offset);
+      result = false;
+    }
+    memcpy(buffer, static_cast<char*>(memory_) + offset, size);
+    return result;
+  } else {
+    return pread(file_, buffer, size, offset) == (ssize_t)size;
+  }
+}
+
+bool MachoWalker::CurrentHeader(struct mach_header_64* header, off_t* offset) {
+  if (current_header_) {
+    memcpy(header, current_header_, sizeof(mach_header_64));
+    *offset = current_header_offset_;
+    return true;
+  }
+
+  return false;
+}
+
+bool MachoWalker::FindHeader(cpu_type_t cpu_type,
+                             cpu_subtype_t cpu_subtype,
+                             off_t& offset) {
+  // Read the magic bytes that's common amongst all mach-o files
+  uint32_t magic;
+  if (!ReadBytes(&magic, sizeof(magic), 0))
+    return false;
+
+  offset = sizeof(magic);
+
+  // Figure out what type of file we've got
+  bool is_fat = false;
+  if (magic == FAT_MAGIC || magic == FAT_CIGAM) {
+    is_fat = true;
+  }
+  else if (magic != MH_MAGIC && magic != MH_CIGAM && magic != MH_MAGIC_64 &&
+           magic != MH_CIGAM_64) {
+    return false;
+  }
+
+  if (!is_fat) {
+    // If we don't have a fat header, check if the cpu type matches the single
+    // header
+    struct mach_header header;
+    if (!ReadBytes(&header, sizeof(header), 0))
+      return false;
+
+    if (magic == MH_CIGAM || magic == MH_CIGAM_64)
+      breakpad_swap_mach_header(&header);
+
+    if (cpu_type != header.cputype ||
+        (cpu_subtype != CPU_SUBTYPE_MULTIPLE &&
+         cpu_subtype != header.cpusubtype)) {
+      return false;
+    }
+
+    offset = 0;
+    return true;
+  } else {
+    // Read the fat header and find an appropriate architecture
+    offset = 0;
+    struct fat_header fat;
+    if (!ReadBytes(&fat, sizeof(fat), offset))
+      return false;
+
+    if (NXHostByteOrder() != NX_BigEndian)
+      breakpad_swap_fat_header(&fat);
+
+    offset += sizeof(fat);
+
+    // Search each architecture for the desired one
+    struct fat_arch arch;
+    for (uint32_t i = 0; i < fat.nfat_arch; ++i) {
+      if (!ReadBytes(&arch, sizeof(arch), offset))
+        return false;
+
+      if (NXHostByteOrder() != NX_BigEndian)
+        breakpad_swap_fat_arch(&arch, 1);
+
+      if (arch.cputype == cpu_type &&
+          (cpu_subtype == CPU_SUBTYPE_MULTIPLE ||
+           arch.cpusubtype == cpu_subtype)) {
+        offset = arch.offset;
+        return true;
+      }
+
+      offset += sizeof(arch);
+    }
+  }
+
+  return false;
+}
+
+bool MachoWalker::WalkHeaderAtOffset(off_t offset) {
+  struct mach_header header;
+  if (!ReadBytes(&header, sizeof(header), offset))
+    return false;
+
+  bool swap = (header.magic == MH_CIGAM);
+  if (swap)
+    breakpad_swap_mach_header(&header);
+
+  // Copy the data into the mach_header_64 structure.  Since the 32-bit and
+  // 64-bit only differ in the last field (reserved), this is safe to do.
+  struct mach_header_64 header64;
+  memcpy((void*)&header64, (const void*)&header, sizeof(header));
+  header64.reserved = 0;
+
+  current_header_ = &header64;
+  current_header_size_ = sizeof(header); // 32-bit, not 64-bit
+  current_header_offset_ = offset;
+  offset += current_header_size_;
+  bool result = WalkHeaderCore(offset, header.ncmds, swap);
+  current_header_ = NULL;
+  current_header_size_ = 0;
+  current_header_offset_ = 0;
+  return result;
+}
+
+bool MachoWalker::WalkHeader64AtOffset(off_t offset) {
+  struct mach_header_64 header;
+  if (!ReadBytes(&header, sizeof(header), offset))
+    return false;
+
+  bool swap = (header.magic == MH_CIGAM_64);
+  if (swap)
+    breakpad_swap_mach_header_64(&header);
+
+  current_header_ = &header;
+  current_header_size_ = sizeof(header);
+  current_header_offset_ = offset;
+  offset += current_header_size_;
+  bool result = WalkHeaderCore(offset, header.ncmds, swap);
+  current_header_ = NULL;
+  current_header_size_ = 0;
+  current_header_offset_ = 0;
+  return result;
+}
+
+bool MachoWalker::WalkHeaderCore(off_t offset, uint32_t number_of_commands,
+                                 bool swap) {
+  for (uint32_t i = 0; i < number_of_commands; ++i) {
+    struct load_command cmd;
+    if (!ReadBytes(&cmd, sizeof(cmd), offset))
+      return false;
+
+    if (swap)
+      breakpad_swap_load_command(&cmd);
+
+    // Call the user callback
+    if (callback_ && !callback_(this, &cmd, offset, swap, callback_context_))
+      break;
+
+    offset += cmd.cmdsize;
+  }
+
+  return true;
+}
+
+}  // namespace MacFileUtilities