| 1 | /*␊ |
| 2 | * Convert.c␊ |
| 3 | * Implement conversion utility functions␊ |
| 4 | * Create UUID parsing functions and gather other conversion routines␊ |
| 5 | * --Rek␊ |
| 6 | */␊ |
| 7 | ␊ |
| 8 | #include "convert.h"␊ |
| 9 | ␊ |
| 10 | /* Return a string that is the representation of a 16 bytes UUID */␊ |
| 11 | void getStringFromUUID(const uuid_t uuid, uuid_string_t out)␊ |
| 12 | {␊ |
| 13 | sprintf((char*) out, "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",␊ |
| 14 | uuid[0], uuid[1], uuid[2], uuid[3],␊ |
| 15 | uuid[4], uuid[5], uuid[6], uuid[7],␊ |
| 16 | uuid[8], uuid[9], uuid[10],uuid[11],␊ |
| 17 | uuid[12],uuid[13],uuid[14],uuid[15]);␊ |
| 18 | }␊ |
| 19 | ␊ |
| 20 | /* Parse an UUID string and return a new allocated UUID */␊ |
| 21 | uuid_t* newUUIDFromString(const char *source)␊ |
| 22 | {␊ |
| 23 | if (! source) return NULL;␊ |
| 24 | ␊ |
| 25 | const char* p = source;␊ |
| 26 | int i;␊ |
| 27 | int len;␊ |
| 28 | char uuid_hex[UUID_LEN*2+1];␊ |
| 29 | ␊ |
| 30 | // Check if UUID is valid␊ |
| 31 | for (i=0; *p != 0 && i < UUID_LEN*2; p++) {␊ |
| 32 | if (*p == '-')␊ |
| 33 | continue;␊ |
| 34 | ␊ |
| 35 | if (!isxdigit(*p)) {␊ |
| 36 | return NULL;␊ |
| 37 | }␊ |
| 38 | uuid_hex[i++] = *p;␊ |
| 39 | }␊ |
| 40 | ␊ |
| 41 | // invalid size␊ |
| 42 | if (*p != 0 || i != UUID_LEN*2) {␊ |
| 43 | return NULL;␊ |
| 44 | }␊ |
| 45 | ␊ |
| 46 | uuid_hex[i] = 0; // null terminated string␊ |
| 47 | ␊ |
| 48 | return convertHexStr2Binary(uuid_hex, &len);␊ |
| 49 | }␊ |
| 50 | ␊ |
| 51 | void *convertHexStr2Binary(const char *hexStr, int *outLength)␊ |
| 52 | {␊ |
| 53 | int len;␊ |
| 54 | char hexNibble;␊ |
| 55 | char hexByte[2];␊ |
| 56 | uint8_t binChar;␊ |
| 57 | uint8_t *binStr;␊ |
| 58 | int hexStrIdx, binStrIdx, hexNibbleIdx;␊ |
| 59 | ␊ |
| 60 | len = strlen(hexStr);␊ |
| 61 | if (len > 1)␊ |
| 62 | {␊ |
| 63 | // the resulting binary will be the half size of the input hex string␊ |
| 64 | binStr = malloc(len / 2);␊ |
| 65 | binStrIdx = 0;␊ |
| 66 | hexNibbleIdx = 0;␊ |
| 67 | for (hexStrIdx = 0; hexStrIdx < len; hexStrIdx++)␊ |
| 68 | {␊ |
| 69 | hexNibble = hexStr[hexStrIdx];␊ |
| 70 | ␊ |
| 71 | // ignore all chars except valid hex numbers␊ |
| 72 | if (hexNibble >= '0' && hexNibble <= '9'␊ |
| 73 | || hexNibble >= 'A' && hexNibble <= 'F'␊ |
| 74 | || hexNibble >= 'a' && hexNibble <= 'f')␊ |
| 75 | {␊ |
| 76 | hexByte[hexNibbleIdx++] = hexNibble;␊ |
| 77 | ␊ |
| 78 | // found both two nibbles, convert to binary␊ |
| 79 | if (hexNibbleIdx == 2)␊ |
| 80 | {␊ |
| 81 | binChar = 0;␊ |
| 82 | ␊ |
| 83 | for (hexNibbleIdx = 0; hexNibbleIdx < sizeof(hexByte); hexNibbleIdx++)␊ |
| 84 | {␊ |
| 85 | if (hexNibbleIdx > 0) binChar = binChar << 4;␊ |
| 86 | ␊ |
| 87 | if (hexByte[hexNibbleIdx] <= '9') binChar += hexByte[hexNibbleIdx] - '0';␊ |
| 88 | else if (hexByte[hexNibbleIdx] <= 'F') binChar += hexByte[hexNibbleIdx] - ('A' - 10);␊ |
| 89 | else if (hexByte[hexNibbleIdx] <= 'f') binChar += hexByte[hexNibbleIdx] - ('a' - 10);␊ |
| 90 | }␊ |
| 91 | ␊ |
| 92 | binStr[binStrIdx++] = binChar;␊ |
| 93 | hexNibbleIdx = 0;␊ |
| 94 | }␊ |
| 95 | }␊ |
| 96 | }␊ |
| 97 | *outLength = binStrIdx;␊ |
| 98 | return binStr;␊ |
| 99 | }␊ |
| 100 | else␊ |
| 101 | {␊ |
| 102 | *outLength = 0;␊ |
| 103 | return NULL;␊ |
| 104 | }␊ |
| 105 | }␊ |
| 106 | |
