1 // Copyright (c) 2006, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // file_id.cc: Return a unique identifier for a file 31 // 32 // See file_id.h for documentation 33 // 34 // Author: Dan Waylonis 35 36 #include <fcntl.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 #include "common/mac/file_id.h" 41 #include "common/mac/macho_id.h" 42 43 using MacFileUtilities::MachoID; 44 45 namespace google_breakpad { 46 47 FileID::FileID(const char *path) { 48 strlcpy(path_, path, sizeof(path_)); 49 } 50 51 bool FileID::FileIdentifier(unsigned char identifier[16]) { 52 int fd = open(path_, O_RDONLY); 53 if (fd == -1) 54 return false; 55 56 MD5Context md5; 57 MD5Init(&md5); 58 59 // Read 4k x 2 bytes at a time. This is faster than just 4k bytes, but 60 // doesn't seem to be an unreasonable size for the stack. 61 unsigned char buffer[4096 * 2]; 62 size_t buffer_size = sizeof(buffer); 63 while ((buffer_size = read(fd, buffer, buffer_size) > 0)) { 64 MD5Update(&md5, buffer, static_cast<unsigned>(buffer_size)); 65 } 66 67 close(fd); 68 MD5Final(identifier, &md5); 69 70 return true; 71 } 72 73 bool FileID::MachoIdentifier(cpu_type_t cpu_type, 74 cpu_subtype_t cpu_subtype, 75 unsigned char identifier[16]) { 76 MachoID macho(path_); 77 78 if (macho.UUIDCommand(cpu_type, cpu_subtype, identifier)) 79 return true; 80 81 return macho.MD5(cpu_type, cpu_subtype, identifier); 82 } 83 84 // static 85 void FileID::ConvertIdentifierToString(const unsigned char identifier[16], 86 char *buffer, int buffer_length) { 87 int buffer_idx = 0; 88 for (int idx = 0; (buffer_idx < buffer_length) && (idx < 16); ++idx) { 89 int hi = (identifier[idx] >> 4) & 0x0F; 90 int lo = (identifier[idx]) & 0x0F; 91 92 if (idx == 4 || idx == 6 || idx == 8 || idx == 10) 93 buffer[buffer_idx++] = '-'; 94 95 buffer[buffer_idx++] = 96 static_cast<char>((hi >= 10) ? ('A' + hi - 10) : ('0' + hi)); 97 buffer[buffer_idx++] = 98 static_cast<char>((lo >= 10) ? ('A' + lo - 10) : ('0' + lo)); 99 } 100 101 // NULL terminate 102 buffer[(buffer_idx < buffer_length) ? buffer_idx : buffer_idx - 1] = 0; 103 } 104 105 } // namespace google_breakpad 106
