srs5694 | 20e2a97 | 2010-02-04 00:55:04 -0500 | [diff] [blame] | 1 | // |
| 2 | // C++ Implementation: GUIDData |
| 3 | // |
| 4 | // Description: GUIDData class header |
| 5 | // Implements the GUIDData data structure and support methods |
| 6 | // |
| 7 | // |
| 8 | // Author: Rod Smith <rodsmith@rodsbooks.com>, (C) 2010 |
| 9 | // |
| 10 | // Copyright: See COPYING file that comes with this distribution |
| 11 | // |
| 12 | // |
| 13 | |
| 14 | #define __STDC_LIMIT_MACROS |
| 15 | #define __STDC_CONSTANT_MACROS |
| 16 | |
| 17 | #include <stdio.h> |
| 18 | #include <string> |
| 19 | #include <iostream> |
| 20 | #include "guid.h" |
| 21 | #include "support.h" |
| 22 | |
| 23 | using namespace std; |
| 24 | |
| 25 | GUIDData::GUIDData(void) { |
| 26 | Zero(); |
| 27 | } // constructor |
| 28 | |
| 29 | GUIDData::GUIDData(const GUIDData & orig) { |
| 30 | int i; |
| 31 | |
| 32 | for (i = 0; i < 16; i++) |
| 33 | uuidData[i] = orig.uuidData[i]; |
| 34 | } // copy constructor |
| 35 | |
| 36 | GUIDData::GUIDData(const char * orig) { |
| 37 | operator=(orig); |
| 38 | } // copy (from char*) constructor |
| 39 | |
| 40 | GUIDData::~GUIDData(void) { |
| 41 | } // destructor |
| 42 | |
| 43 | GUIDData & GUIDData::operator=(const GUIDData & orig) { |
| 44 | int i; |
| 45 | |
| 46 | for (i = 0; i < 16; i++) |
| 47 | uuidData[i] = orig.uuidData[i]; |
| 48 | return *this; |
| 49 | } // GUIDData::operator=(const GUIDData & orig) |
| 50 | |
| 51 | // Assign the GUID from a string input value. A GUID is normally formatted |
| 52 | // with four dashes as element separators, for a total length of 36 |
| 53 | // characters. If the input string is this long or longer, this function |
| 54 | // assumes standard separator positioning; if the input string is less |
| 55 | // than 36 characters long, this function assumes the input GUID has |
| 56 | // been compressed by removal of separators. In either event, there's |
| 57 | // little in the way of sanity checking, so garbage in = garbage out! |
| 58 | GUIDData & GUIDData::operator=(const string & orig) { |
| 59 | string copy, fragment; |
| 60 | size_t len; |
| 61 | // Break points for segments, either with or without characters separating the segments.... |
| 62 | size_t longSegs[6] = {0, 9, 14, 19, 24, 36}; |
| 63 | size_t shortSegs[6] = {0, 8, 12, 16, 20, 32}; |
srs5694 | 55d9261 | 2010-03-07 22:16:07 -0500 | [diff] [blame^] | 64 | size_t *segStart = longSegs; // Assume there are separators between segments |
srs5694 | 20e2a97 | 2010-02-04 00:55:04 -0500 | [diff] [blame] | 65 | |
| 66 | Zero(); |
| 67 | |
| 68 | // Delete stray spaces.... |
| 69 | copy = DeleteSpaces(orig); |
| 70 | |
| 71 | // If length is too short, assume there are no separators between segments |
| 72 | len = copy.length(); |
| 73 | if (len < 36) { |
| 74 | segStart = shortSegs; |
| 75 | }; |
| 76 | |
| 77 | // Extract data fragments at fixed locations and convert to |
| 78 | // integral types.... |
| 79 | if (len >= segStart[1]) { |
| 80 | uuidData[3] = StrToHex(copy, 0); |
| 81 | uuidData[2] = StrToHex(copy, 2); |
| 82 | uuidData[1] = StrToHex(copy, 4); |
| 83 | uuidData[0] = StrToHex(copy, 6); |
| 84 | } // if |
| 85 | if (len >= segStart[2]) { |
| 86 | uuidData[5] = StrToHex(copy, segStart[1]); |
| 87 | uuidData[4] = StrToHex(copy, segStart[1] + 2); |
| 88 | } // if |
| 89 | if (len >= segStart[3]) { |
| 90 | uuidData[7] = StrToHex(copy, segStart[2]); |
| 91 | uuidData[6] = StrToHex(copy, segStart[2] + 2); |
| 92 | } // if |
| 93 | if (len >= segStart[4]) { |
| 94 | uuidData[8] = StrToHex(copy, segStart[3]); |
| 95 | uuidData[9] = StrToHex(copy, segStart[3] + 2); |
| 96 | } // if |
| 97 | if (len >= segStart[5]) { |
| 98 | uuidData[10] = StrToHex(copy, segStart[4]); |
| 99 | uuidData[11] = StrToHex(copy, segStart[4] + 2); |
| 100 | uuidData[12] = StrToHex(copy, segStart[4] + 4); |
| 101 | uuidData[13] = StrToHex(copy, segStart[4] + 6); |
| 102 | uuidData[14] = StrToHex(copy, segStart[4] + 8); |
| 103 | uuidData[15] = StrToHex(copy, segStart[4] + 10); |
| 104 | } // if |
| 105 | |
| 106 | return *this; |
| 107 | } // GUIDData::operator=(const string & orig) |
| 108 | |
| 109 | // Assignment from C-style string; rely on C++ casting.... |
| 110 | GUIDData & GUIDData::operator=(const char * orig) { |
| 111 | return operator=((string) orig); |
| 112 | } // GUIDData::operator=(const char * orig) |
| 113 | |
| 114 | // Read a GUIDData from stdin, prompting the user along the way for the |
| 115 | // correct form. This is a bit more flexible than it claims; it parses |
| 116 | // any entry of 32 or 36 characters as a GUID ( |
| 117 | GUIDData & GUIDData::GetGUIDFromUser(void) { |
| 118 | string part1, part2, part3, part4, part5; |
| 119 | char line[255]; |
| 120 | int entered = 0; |
| 121 | |
| 122 | cout << "\nA GUID is entered in five segments of from two to six bytes, with\n" |
| 123 | << "dashes between segments.\n"; |
| 124 | cout << "Enter the entire GUID, a four-byte hexadecimal number for the first segment, or\n" |
| 125 | << "'R' to generate the entire GUID randomly: "; |
| 126 | cin.get(line, 255); |
| 127 | part1 = DeleteSpaces(line); |
| 128 | |
| 129 | // If user entered 'r' or 'R', generate GUID randomly.... |
| 130 | if ((part1[0] == 'r') || (part1[0] == 'R')) { |
| 131 | Randomize(); |
| 132 | entered = 1; |
| 133 | } // if user entered 'R' or 'r' |
| 134 | |
| 135 | // If string length is right for whole entry, try to parse it.... |
| 136 | if (((part1.length() == 36) || (part1.length() == 32)) && (entered == 0)) { |
| 137 | operator=(part1); |
| 138 | entered = 1; |
| 139 | } // if |
| 140 | |
| 141 | // If neither of the above methods of entry was used, use prompted |
| 142 | // entry.... |
| 143 | if (entered == 0) { |
| 144 | cout << "Enter a two-byte hexadecimal number for the second segment: "; |
| 145 | cin >> part2; |
| 146 | cout << "Enter a two-byte hexadecimal number for the third segment: "; |
| 147 | cin >> part3; |
| 148 | cout << "Enter a two-byte hexadecimal number for the fourth segment: "; |
| 149 | cin >> part4; |
| 150 | cout << "Enter a six-byte hexadecimal number for the fifth segment: "; |
| 151 | cin >> part5; |
| 152 | operator=(part1 += (string) "-" += part2 += (string) "-" += part3 |
srs5694 | 55d9261 | 2010-03-07 22:16:07 -0500 | [diff] [blame^] | 153 | += (string) "-" += part4 += (string) "-" += part5); |
srs5694 | 20e2a97 | 2010-02-04 00:55:04 -0500 | [diff] [blame] | 154 | } // if/else |
| 155 | cin.ignore(255, '\n'); |
| 156 | cout << "New GUID: " << AsString() << "\n"; |
| 157 | return *this; |
| 158 | } // GUIDData::GetGUIDData(void) |
| 159 | |
| 160 | // Erase the contents of the GUID |
| 161 | void GUIDData::Zero(void) { |
| 162 | int i; |
| 163 | |
| 164 | for (i = 0; i < 16; i++) { |
| 165 | uuidData[i] = 0; |
| 166 | } // for |
| 167 | } // GUIDData::Zero() |
| 168 | |
| 169 | // Set a completely random GUID value.... |
| 170 | // The uuid_generate() function returns a value that needs to have its |
| 171 | // first three fields byte-reversed to conform to Intel's GUID layout. |
| 172 | // If that function isn't defined (e.g., on Windows), set a completely |
| 173 | // random GUID -- not completely kosher, but it doesn't seem to cause |
| 174 | // any problems (so far...) |
| 175 | void GUIDData::Randomize(void) { |
| 176 | #ifdef _UUID_UUID_H |
| 177 | uuid_generate(uuidData); |
| 178 | ReverseBytes(&uuidData[0], 4); |
| 179 | ReverseBytes(&uuidData[4], 2); |
| 180 | ReverseBytes(&uuidData[6], 2); |
| 181 | #else |
| 182 | int i; |
| 183 | for (i = 0; i < 16; i++) |
| 184 | uuidData[i] = rand(); |
| 185 | #endif |
| 186 | } // GUIDData::Randomize |
| 187 | |
| 188 | // Equality operator; returns 1 if the GUIDs are equal, 0 if they're unequal |
| 189 | int GUIDData::operator==(const GUIDData & orig) { |
| 190 | int retval = 1; // assume they're equal |
| 191 | int i; |
| 192 | |
| 193 | for (i = 0; i < 16; i++) |
| 194 | if (uuidData[i] != orig.uuidData[i]) |
| 195 | retval = 0; |
| 196 | |
| 197 | return retval; |
| 198 | } // GUIDData::operator== |
| 199 | |
| 200 | // Inequality operator; returns 1 if the GUIDs are unequal, 0 if they're equal |
| 201 | int GUIDData::operator!=(const GUIDData & orig) { |
| 202 | return !operator==(orig); |
| 203 | } // GUIDData::operator!= |
| 204 | |
| 205 | // Return the GUID as a string, suitable for display to the user. |
| 206 | string GUIDData::AsString(void) { |
| 207 | char theString[40]; |
| 208 | |
| 209 | sprintf(theString, |
| 210 | "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", |
| 211 | uuidData[3], uuidData[2], uuidData[1], uuidData[0], uuidData[5], |
| 212 | uuidData[4], uuidData[7], uuidData[6], uuidData[8], uuidData[9], |
| 213 | uuidData[10], uuidData[11], uuidData[12], uuidData[13], uuidData[14], |
| 214 | uuidData[15]); |
| 215 | return theString; |
| 216 | } // GUIDData::AsString(void) |
| 217 | |
| 218 | // Delete spaces or braces (which often enclose GUIDs) from the orig string, |
| 219 | // returning modified string. |
srs5694 | 55d9261 | 2010-03-07 22:16:07 -0500 | [diff] [blame^] | 220 | string GUIDData::DeleteSpaces(string s) { |
srs5694 | 20e2a97 | 2010-02-04 00:55:04 -0500 | [diff] [blame] | 221 | size_t position; |
| 222 | |
srs5694 | 55d9261 | 2010-03-07 22:16:07 -0500 | [diff] [blame^] | 223 | if (s.length() > 0) { |
| 224 | for (position = s.length(); position > 0; position--) { |
| 225 | if ((s[position - 1] == ' ') || (s[position - 1] == '{') || (s[position - 1] == '}')) { |
| 226 | s.erase(position - 1, 1); |
| 227 | } // if |
| 228 | } // for |
| 229 | } // if |
| 230 | return s; |
srs5694 | 20e2a97 | 2010-02-04 00:55:04 -0500 | [diff] [blame] | 231 | } // GUIDData::DeleteSpaces() |