| // |
| // C++ Implementation: GUIDData |
| // |
| // Description: GUIDData class header |
| // Implements the GUIDData data structure and support methods |
| // |
| // |
| // Author: Rod Smith <rodsmith@rodsbooks.com>, (C) 2010 |
| // |
| // Copyright: See COPYING file that comes with this distribution |
| // |
| // |
| |
| #define __STDC_LIMIT_MACROS |
| #define __STDC_CONSTANT_MACROS |
| |
| #include <stdio.h> |
| #include <string> |
| #include <iostream> |
| #include "guid.h" |
| #include "support.h" |
| |
| using namespace std; |
| |
| GUIDData::GUIDData(void) { |
| Zero(); |
| } // constructor |
| |
| GUIDData::GUIDData(const GUIDData & orig) { |
| int i; |
| |
| for (i = 0; i < 16; i++) |
| uuidData[i] = orig.uuidData[i]; |
| } // copy constructor |
| |
| GUIDData::GUIDData(const char * orig) { |
| operator=(orig); |
| } // copy (from char*) constructor |
| |
| GUIDData::~GUIDData(void) { |
| } // destructor |
| |
| GUIDData & GUIDData::operator=(const GUIDData & orig) { |
| int i; |
| |
| for (i = 0; i < 16; i++) |
| uuidData[i] = orig.uuidData[i]; |
| return *this; |
| } // GUIDData::operator=(const GUIDData & orig) |
| |
| // Assign the GUID from a string input value. A GUID is normally formatted |
| // with four dashes as element separators, for a total length of 36 |
| // characters. If the input string is this long or longer, this function |
| // assumes standard separator positioning; if the input string is less |
| // than 36 characters long, this function assumes the input GUID has |
| // been compressed by removal of separators. In either event, there's |
| // little in the way of sanity checking, so garbage in = garbage out! |
| // One special case: If the first character is 'r' or 'R', a random |
| // GUID is assigned. |
| GUIDData & GUIDData::operator=(const string & orig) { |
| string copy, fragment; |
| size_t len; |
| // Break points for segments, either with or without characters separating the segments.... |
| size_t longSegs[6] = {0, 9, 14, 19, 24, 36}; |
| size_t shortSegs[6] = {0, 8, 12, 16, 20, 32}; |
| size_t *segStart = longSegs; // Assume there are separators between segments |
| |
| // If first character is an 'R' or 'r', set a random GUID; otherwise, |
| // try to parse it as a real GUID |
| if ((orig[0] == 'R') || (orig[0] == 'r')) { |
| Randomize(); |
| } else { |
| Zero(); |
| |
| // Delete stray spaces.... |
| copy = DeleteSpaces(orig); |
| |
| // If length is too short, assume there are no separators between segments |
| len = copy.length(); |
| if (len < 36) { |
| segStart = shortSegs; |
| }; |
| |
| // Extract data fragments at fixed locations and convert to |
| // integral types.... |
| if (len >= segStart[1]) { |
| uuidData[3] = StrToHex(copy, 0); |
| uuidData[2] = StrToHex(copy, 2); |
| uuidData[1] = StrToHex(copy, 4); |
| uuidData[0] = StrToHex(copy, 6); |
| } // if |
| if (len >= segStart[2]) { |
| uuidData[5] = StrToHex(copy, segStart[1]); |
| uuidData[4] = StrToHex(copy, segStart[1] + 2); |
| } // if |
| if (len >= segStart[3]) { |
| uuidData[7] = StrToHex(copy, segStart[2]); |
| uuidData[6] = StrToHex(copy, segStart[2] + 2); |
| } // if |
| if (len >= segStart[4]) { |
| uuidData[8] = StrToHex(copy, segStart[3]); |
| uuidData[9] = StrToHex(copy, segStart[3] + 2); |
| } // if |
| if (len >= segStart[5]) { |
| uuidData[10] = StrToHex(copy, segStart[4]); |
| uuidData[11] = StrToHex(copy, segStart[4] + 2); |
| uuidData[12] = StrToHex(copy, segStart[4] + 4); |
| uuidData[13] = StrToHex(copy, segStart[4] + 6); |
| uuidData[14] = StrToHex(copy, segStart[4] + 8); |
| uuidData[15] = StrToHex(copy, segStart[4] + 10); |
| } // if |
| } // if/else randomize/set value |
| |
| return *this; |
| } // GUIDData::operator=(const string & orig) |
| |
| // Assignment from C-style string; rely on C++ casting.... |
| GUIDData & GUIDData::operator=(const char * orig) { |
| return operator=((string) orig); |
| } // GUIDData::operator=(const char * orig) |
| |
| // Read a GUIDData from stdin, prompting the user along the way for the |
| // correct form. This is a bit more flexible than it claims; it parses |
| // any entry of 32 or 36 characters as a GUID ( |
| GUIDData & GUIDData::GetGUIDFromUser(void) { |
| string part1, part2, part3, part4, part5; |
| char line[255]; |
| int entered = 0; |
| |
| cout << "\nA GUID is entered in five segments of from two to six bytes, with\n" |
| << "dashes between segments.\n"; |
| cout << "Enter the entire GUID, a four-byte hexadecimal number for the first segment, or\n" |
| << "'R' to generate the entire GUID randomly: "; |
| cin.get(line, 255); |
| part1 = DeleteSpaces(line); |
| |
| // If user entered 'r' or 'R', generate GUID randomly.... |
| if ((part1[0] == 'r') || (part1[0] == 'R')) { |
| Randomize(); |
| entered = 1; |
| } // if user entered 'R' or 'r' |
| |
| // If string length is right for whole entry, try to parse it.... |
| if (((part1.length() == 36) || (part1.length() == 32)) && (entered == 0)) { |
| operator=(part1); |
| entered = 1; |
| } // if |
| |
| // If neither of the above methods of entry was used, use prompted |
| // entry.... |
| if (entered == 0) { |
| cout << "Enter a two-byte hexadecimal number for the second segment: "; |
| cin >> part2; |
| cout << "Enter a two-byte hexadecimal number for the third segment: "; |
| cin >> part3; |
| cout << "Enter a two-byte hexadecimal number for the fourth segment: "; |
| cin >> part4; |
| cout << "Enter a six-byte hexadecimal number for the fifth segment: "; |
| cin >> part5; |
| operator=(part1 += (string) "-" += part2 += (string) "-" += part3 |
| += (string) "-" += part4 += (string) "-" += part5); |
| } // if/else |
| cin.ignore(255, '\n'); |
| cout << "New GUID: " << AsString() << "\n"; |
| return *this; |
| } // GUIDData::GetGUIDData(void) |
| |
| // Erase the contents of the GUID |
| void GUIDData::Zero(void) { |
| int i; |
| |
| for (i = 0; i < 16; i++) { |
| uuidData[i] = 0; |
| } // for |
| } // GUIDData::Zero() |
| |
| // Set a completely random GUID value.... |
| // The uuid_generate() function returns a value that needs to have its |
| // first three fields byte-reversed to conform to Intel's GUID layout. |
| // If that function isn't defined (e.g., on Windows), set a completely |
| // random GUID -- not completely kosher, but it doesn't seem to cause |
| // any problems (so far...) |
| void GUIDData::Randomize(void) { |
| #ifdef _UUID_UUID_H |
| uuid_generate(uuidData); |
| ReverseBytes(&uuidData[0], 4); |
| ReverseBytes(&uuidData[4], 2); |
| ReverseBytes(&uuidData[6], 2); |
| #else |
| int i; |
| for (i = 0; i < 16; i++) |
| uuidData[i] = rand(); |
| #endif |
| } // GUIDData::Randomize |
| |
| // Equality operator; returns 1 if the GUIDs are equal, 0 if they're unequal |
| int GUIDData::operator==(const GUIDData & orig) { |
| int retval = 1; // assume they're equal |
| int i; |
| |
| for (i = 0; i < 16; i++) |
| if (uuidData[i] != orig.uuidData[i]) |
| retval = 0; |
| |
| return retval; |
| } // GUIDData::operator== |
| |
| // Inequality operator; returns 1 if the GUIDs are unequal, 0 if they're equal |
| int GUIDData::operator!=(const GUIDData & orig) { |
| return !operator==(orig); |
| } // GUIDData::operator!= |
| |
| // Return the GUID as a string, suitable for display to the user. |
| string GUIDData::AsString(void) { |
| char theString[40]; |
| |
| sprintf(theString, |
| "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", |
| uuidData[3], uuidData[2], uuidData[1], uuidData[0], uuidData[5], |
| uuidData[4], uuidData[7], uuidData[6], uuidData[8], uuidData[9], |
| uuidData[10], uuidData[11], uuidData[12], uuidData[13], uuidData[14], |
| uuidData[15]); |
| return theString; |
| } // GUIDData::AsString(void) |
| |
| // Delete spaces or braces (which often enclose GUIDs) from the orig string, |
| // returning modified string. |
| string GUIDData::DeleteSpaces(string s) { |
| size_t position; |
| |
| if (s.length() > 0) { |
| for (position = s.length(); position > 0; position--) { |
| if ((s[position - 1] == ' ') || (s[position - 1] == '{') || (s[position - 1] == '}')) { |
| s.erase(position - 1, 1); |
| } // if |
| } // for |
| } // if |
| return s; |
| } // GUIDData::DeleteSpaces() |