First round of dead file removal

experimental/visual_studio_plugin/third_party/breakpad/common/solaris/file_id.cc

-// Copyright (c) 2007, 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
-//
-// Author: Alfred Peng
-
-#include <elf.h>
-#include <fcntl.h>
-#include <gelf.h>
-#include <sys/mman.h>
-#include <sys/ksyms.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <cassert>
-#include <cstdio>
-
-#include "common/md5.h"
-#include "common/solaris/file_id.h"
-#include "common/solaris/message_output.h"
-#include "google_breakpad/common/minidump_format.h"
-
-namespace google_breakpad {
-
-class AutoElfEnder {
- public:
-  AutoElfEnder(Elf *elf) : elf_(elf) {}
-  ~AutoElfEnder() { if (elf_) elf_end(elf_); }
- private:
-  Elf *elf_;
-};
-
-// Find the text section in elf object file.
-// Return the section start address and the size.
-static bool FindElfTextSection(int fd, const void *elf_base,
-                               const void **text_start,
-                               int *text_size) {
-  assert(text_start);
-  assert(text_size);
-
-  *text_start = NULL;
-  *text_size = 0;
-
-  if (elf_version(EV_CURRENT) == EV_NONE) {
-    print_message2(2, "elf_version() failed: %s\n", elf_errmsg(0));
-    return false;
-  }
-
-  GElf_Ehdr elf_header;
-  lseek(fd, 0L, 0);
-  Elf *elf = elf_begin(fd, ELF_C_READ, NULL);
-  AutoElfEnder elfEnder(elf);
-
-  if (gelf_getehdr(elf, &elf_header) == (GElf_Ehdr *)NULL) {
-    print_message2(2, "failed to read elf header: %s\n", elf_errmsg(-1));
-    return false;
-  }
-
-  if (elf_header.e_ident[EI_MAG0] != ELFMAG0 ||
-      elf_header.e_ident[EI_MAG1] != ELFMAG1 ||
-      elf_header.e_ident[EI_MAG2] != ELFMAG2 ||
-      elf_header.e_ident[EI_MAG3] != ELFMAG3) {
-    print_message1(2, "header magic doesn't match\n");
-    return false;
-  }
-
-  static const char kTextSectionName[] = ".text";
-  const GElf_Shdr *text_section = NULL;
-  Elf_Scn *scn = NULL;
-  GElf_Shdr shdr;
-
-  while ((scn = elf_nextscn(elf, scn)) != NULL) {
-    if (gelf_getshdr(scn, &shdr) == (GElf_Shdr *)0) {
-      print_message2(2, "failed to read section header: %s\n", elf_errmsg(0));
-      return false;
-    }
-
-    if (shdr.sh_type == SHT_PROGBITS) {
-      const char *section_name = elf_strptr(elf, elf_header.e_shstrndx,
-                                            shdr.sh_name);
-      if (!section_name) {
-        print_message2(2, "Section name error: %s\n", elf_errmsg(-1));
-        continue;
-      }
-
-      if (strcmp(section_name, kTextSectionName) == 0) {
-        text_section = &shdr;
-        break;
-      }
-    }
-  }
-  if (text_section != NULL && text_section->sh_size > 0) {
-    *text_start = (char *)elf_base + text_section->sh_offset;
-    *text_size = text_section->sh_size;
-    return true;
-  }
-
-  return false;
-}
-
-FileID::FileID(const char *path) {
-  strcpy(path_, path);
-}
-
-class AutoCloser {
- public:
-  AutoCloser(int fd) : fd_(fd) {}
-  ~AutoCloser() { if (fd_) close(fd_); }
- private:
-  int fd_;
-};
-
-bool FileID::ElfFileIdentifier(unsigned char identifier[16]) {
-  int fd = 0;
-  if ((fd = open(path_, O_RDONLY)) < 0)
-    return false;
-
-  AutoCloser autocloser(fd);
-  struct stat st;
-  if (fstat(fd, &st) != 0 || st.st_size <= 0)
-    return false;
-
-  void *base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-  if (base == MAP_FAILED)
-    return false;
-
-  bool success = false;
-  const void *text_section = NULL;
-  int text_size = 0;
-
-  if (FindElfTextSection(fd, base, &text_section, &text_size)) {
-    MD5Context md5;
-    MD5Init(&md5);
-    MD5Update(&md5, (const unsigned char *)text_section, text_size);
-    MD5Final(identifier, &md5);
-    success = true;
-  }
-
-  munmap((char *)base, st.st_size);
-  return success;
-}
-
-// static
-bool FileID::ConvertIdentifierToString(const unsigned char identifier[16],
-                                       char *buffer, int buffer_length) {
-  if (buffer_length < 34)
-    return false;
-
-  int buffer_idx = 0;
-  for (int idx = 0; idx < 16; ++idx) {
-    int hi = (identifier[idx] >> 4) & 0x0F;
-    int lo = (identifier[idx]) & 0x0F;
-
-    buffer[buffer_idx++] = (hi >= 10) ? 'A' + hi - 10 : '0' + hi;
-    buffer[buffer_idx++] = (lo >= 10) ? 'A' + lo - 10 : '0' + lo;
-  }
-
-  // Add an extra "0" by the end.
-  buffer[buffer_idx++] = '0';
-
-  // NULL terminate
-  buffer[buffer_idx] = 0;
-
-  return true;
-}
-
-}  // namespace google_breakpad