Linux: Use upstream google-breakpad instead of our fork....

breakpad/linux/file_id.cc

-// Copyright (c) 2006, 2009, 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.
-//
-// file_id.cc: Return a unique identifier for a file
-//
-// See file_id.h for documentation
-//
-
-#include "breakpad/linux/file_id.h"
-
-#include <arpa/inet.h>
-#include <elf.h>
-#include <fcntl.h>
-#include <link.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <unistd.h>
-
-#include <cassert>
-#include <cstdio>
-
-namespace google_breakpad {
-
-FileID::FileID(const char* path) {
-  strncpy(path_, path, sizeof(path_));
-}
-
-bool FileID::ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]) {
-  const size_t mapped_len = 4096;  // Page size (matches WriteMappings())
-  int fd = open(path_, O_RDONLY);
-  if (fd < 0)
-    return false;
-  struct stat st;
-  if (fstat(fd, &st) != 0 || st.st_size <= mapped_len) {
-    close(fd);
-    return false;
-  }
-  void* base = mmap(NULL, mapped_len,
-                    PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-  close(fd);
-  if (base == MAP_FAILED)
-    return false;
-
-  memset(identifier, 0, kMDGUIDSize);
-  uint8_t* ptr = reinterpret_cast<uint8_t*>(base);
-  uint8_t* ptr_end = ptr + mapped_len;
-  while (ptr < ptr_end) {
-    for (unsigned i = 0; i < kMDGUIDSize; i++)
-      identifier[i] ^= ptr[i];
-    ptr += kMDGUIDSize;
-  }
-
-  munmap(base, mapped_len);
-  return true;
-}
-
-// static
-void FileID::ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
-                                       char* buffer, int buffer_length) {
-  uint8_t identifier_swapped[kMDGUIDSize];
-
-  // Endian-ness swap to match dump processor expectation.
-  memcpy(identifier_swapped, identifier, kMDGUIDSize);
-  uint32_t* data1 = reinterpret_cast<uint32_t*>(identifier_swapped);
-  *data1 = htonl(*data1);
-  uint16_t* data2 = reinterpret_cast<uint16_t*>(identifier_swapped + 4);
-  *data2 = htons(*data2);
-  uint16_t* data3 = reinterpret_cast<uint16_t*>(identifier_swapped + 6);
-  *data3 = htons(*data3);
-
-  int buffer_idx = 0;
-  for (int idx = 0;
-       (buffer_idx < buffer_length) && (idx < kMDGUIDSize);
-       ++idx) {
-    int hi = (identifier_swapped[idx] >> 4) & 0x0F;
-    int lo = (identifier_swapped[idx]) & 0x0F;
-
-    if (idx == 4 || idx == 6 || idx == 8 || idx == 10)
-      buffer[buffer_idx++] = '-';
-
-    buffer[buffer_idx++] = (hi >= 10) ? 'A' + hi - 10 : '0' + hi;
-    buffer[buffer_idx++] = (lo >= 10) ? 'A' + lo - 10 : '0' + lo;
-  }
-
-  // NULL terminate
-  buffer[(buffer_idx < buffer_length) ? buffer_idx : buffer_idx - 1] = 0;
-}
-
-}  // namespace google_breakpad