Azure IoT common library
Fork of azure_c_shared_utility by
uniqueid_stub.c
- Committer:
- Azure.IoT Build
- Date:
- 2016-07-01
- Revision:
- 6:c55b013dfc2a
- Parent:
- 1:9190c0f4d23a
File content as of revision 6:c55b013dfc2a:
// Copyright (c) Microsoft. All rights reserved. // Licensed under the MIT license. See LICENSE file in the project root for full license information. #include <stdlib.h> #include <stdint.h> #include "azure_c_shared_utility/uniqueid.h" #include "azure_c_shared_utility/xlogging.h" #include <time.h> DEFINE_ENUM_STRINGS(UNIQUEID_RESULT, UNIQUEID_RESULT_VALUES); static const char tochar[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; static void generate128BitUUID(unsigned char* arrayOfByte) { size_t arrayIndex; for (arrayIndex = 0; arrayIndex < 16; arrayIndex++) { arrayOfByte[arrayIndex] = (unsigned char)rand(); } // // Stick in the version field for random uuid. // arrayOfByte[7] &= 0x0f; //clear the bit field arrayOfByte[7] |= 0x40; //set the ones we care about // // Stick in the variant field for the random uuid. // arrayOfByte[8] &= 0xf3; // Clear arrayOfByte[8] |= 0x08; // Set } // TODO: The User will need to call srand before calling this function UNIQUEID_RESULT UniqueId_Generate(char* uid, size_t len) { UNIQUEID_RESULT result; unsigned char arrayOfChar[16]; /* Codes_SRS_UNIQUEID_07_002: [If uid is NULL then UniqueId_Generate shall return UNIQUEID_INVALID_ARG] */ /* Codes_SRS_UNIQUEID_07_003: [If len is less then 37 then UniqueId_Generate shall return UNIQUEID_INVALID_ARG] */ if (uid == NULL || len < 37) { result = UNIQUEID_INVALID_ARG; LogError("Buffer Size is Null or length is less then 37 bytes"); } else { size_t arrayIndex; size_t shiftCount; size_t characterPosition = 0; /* Codes_SRS_UNIQUEID_07_001: [UniqueId_Generate shall create a unique Id 36 character long string.] */ generate128BitUUID(arrayOfChar); for (arrayIndex = 0; arrayIndex < 16; arrayIndex++) { for (shiftCount = 0; shiftCount <= 1; shiftCount++) { char hexChar = tochar[arrayOfChar[arrayIndex] & 0xf]; if ((characterPosition == 8) || (characterPosition == 13) || (characterPosition == 18) || (characterPosition == 23)) { uid[characterPosition] = '-'; characterPosition++; } uid[characterPosition] = hexChar; characterPosition++; arrayOfChar[arrayIndex] = arrayOfChar[arrayIndex] >> 4; } } uid[characterPosition] = 0; result = UNIQUEID_OK; } return result; }