1  // Copyright 2006 Google LLC
 2  //
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 4  // modification, are permitted provided that the following conditions are
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 9  //     * Redistributions in binary form must reproduce the above
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15  // this software without specific prior written permission.
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28  
29  // file_id.cc: Return a unique identifier for a file
30  //
31  // See file_id.h for documentation
32  //
33  // Author: Dan Waylonis
34  
35  #ifdef HAVE_CONFIG_H
36  #include <config.h>  // Must come first
37  #endif
38  
39  #include "common/mac/file_id.h"
40  
41  #include <fcntl.h>
42  #include <stdio.h>
43  #include <string.h>
44  
45  #include "common/mac/macho_id.h"
46  #include "common/scoped_ptr.h"
47  
48  using MacFileUtilities::MachoID;
49  
50  namespace google_breakpad {
51  namespace mach_o {
52  // Constructs a FileID given a path to a file
53  FileID::FileID(const char* path) : memory_(nullptr), size_(0) {
54    snprintf(path_, sizeof(path_), "%s", path);
55  }
56  
57  // Constructs a FileID given the contents of a file and its size
58  FileID::FileID(void* memory, size_t size)
59      : path_(), memory_(memory), size_(size) {}
60  
61  bool FileID::MachoIdentifier(cpu_type_t cpu_type,
62                               cpu_subtype_t cpu_subtype,
63                               unsigned char identifier[16]) {
64    scoped_ptr<MachoID> macho;
65    if (memory_) {
66      macho.reset(new MachoID(memory_, size_));
67    } else {
68      macho.reset(new MachoID(path_));
69    }
70    if (macho->UUIDCommand(cpu_type, cpu_subtype, identifier))
71      return true;
72  
73    return macho->MD5(cpu_type, cpu_subtype, identifier);
74  }
75  
76  // static
77  void FileID::ConvertIdentifierToString(const unsigned char identifier[16],
78                                         char *buffer, int buffer_length) {
79    int buffer_idx = 0;
80    for (int idx = 0; (buffer_idx < buffer_length) && (idx < 16); ++idx) {
81      int hi = (identifier[idx] >> 4) & 0x0F;
82      int lo = (identifier[idx]) & 0x0F;
83  
84      if (idx == 4 || idx == 6 || idx == 8 || idx == 10)
85        buffer[buffer_idx++] = '-';
86  
87      buffer[buffer_idx++] =
88          static_cast<char>((hi >= 10) ? ('A' + hi - 10) : ('0' + hi));
89      buffer[buffer_idx++] =
90          static_cast<char>((lo >= 10) ? ('A' + lo - 10) : ('0' + lo));
91    }
92  
93    // NULL terminate
94    buffer[(buffer_idx < buffer_length) ? buffer_idx : buffer_idx - 1] = 0;
95  }
96  
97  }  // namespace mach_o
98  }  // namespace google_breakpad