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| 1 | +// Implementation of libuuid creating RFC4122 version 4 random UUIDs. |
| 2 | + |
| 3 | +mergeInto(LibraryManager.library, { |
| 4 | + // Clear a 'compact' UUID. |
| 5 | + uuid_clear: function(uu) { |
| 6 | + // void uuid_clear(uuid_t uu); |
| 7 | + _memset(uu, 0, 16); |
| 8 | + }, |
| 9 | + |
| 10 | + // Compare whether or not two 'compact' UUIDs are the same. |
| 11 | + // Returns an integer less than, equal to, or greater than zero if uu1 is found, respectively, to be |
| 12 | + // lexigraphically less than, equal, or greater than uu2. |
| 13 | + uuid_compare__deps: ['memcmp'], |
| 14 | + uuid_compare: function(uu1, uu2) { |
| 15 | + // int uuid_compare(const uuid_t uu1, const uuid_t uu2); |
| 16 | + return _memcmp(uu1, uu2, 16); |
| 17 | + }, |
| 18 | + |
| 19 | + // Copies the 'compact' UUID variable from src to dst. |
| 20 | + uuid_copy: function(dst, src) { |
| 21 | + // void uuid_copy(uuid_t dst, const uuid_t src); |
| 22 | + _memcpy(dst, src, 16); |
| 23 | + }, |
| 24 | + |
| 25 | + // Write a RFC4122 version 4 compliant UUID largely based on the method found in |
| 26 | + // http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript |
| 27 | + // tweaked slightly in order to use the 'compact' UUID form used by libuuid. |
| 28 | + uuid_generate: function(out) { |
| 29 | + // void uuid_generate(uuid_t out); |
| 30 | + var uuid = null; |
| 31 | + |
| 32 | + if (ENVIRONMENT_IS_NODE) { |
| 33 | + // If Node.js try to use crypto.randomBytes |
| 34 | + try { |
| 35 | + var rb = require('crypto').randomBytes; |
| 36 | + uuid = rb(16); |
| 37 | + } catch(e) {} |
| 38 | + } else if (ENVIRONMENT_IS_WEB && |
| 39 | + typeof(window.crypto) !== 'undefined' && |
| 40 | + typeof(window.crypto.getRandomValues) !== 'undefined') { |
| 41 | + // If crypto.getRandomValues is available try to use it. |
| 42 | + uuid = new Uint8Array(16); |
| 43 | + window.crypto.getRandomValues(uuid); |
| 44 | + } |
| 45 | + |
| 46 | + // Fall back to Math.random if a higher quality random number generator is not available. |
| 47 | + if (!uuid) { |
| 48 | + uuid = new Array(16); |
| 49 | + var d = new Date().getTime(); |
| 50 | + for (var i = 0; i < 16; i++) { |
| 51 | + var r = (d + Math.random()*256)%256 | 0; |
| 52 | + d = Math.floor(d/256); |
| 53 | + uuid[i] = r; |
| 54 | + } |
| 55 | + } |
| 56 | + |
| 57 | + uuid[6] = (uuid[6] & 0x0F) | 0x40; |
| 58 | + uuid[8] = (uuid[8] & 0x7F) | 0x80; |
| 59 | + writeArrayToMemory(uuid, out); |
| 60 | + }, |
| 61 | + |
| 62 | + // Compares the value of the supplied 'compact' UUID variable uu to the NULL value. |
| 63 | + // If the value is equal to the NULL UUID, 1 is returned, otherwise 0 is returned. |
| 64 | + uuid_is_null: function(uu) { |
| 65 | + // int uuid_is_null(const uuid_t uu); |
| 66 | + for (var i = 0; i < 4; i++, uu = (uu+4)|0) { |
| 67 | + var val = {{{ makeGetValue('uu', 0, 'i32') }}}; |
| 68 | + if (val) { |
| 69 | + return 0; |
| 70 | + } |
| 71 | + } |
| 72 | + return 1; |
| 73 | + }, |
| 74 | + |
| 75 | + // converts the UUID string given by inp into the binary representation. The input UUID is a string of |
| 76 | + // the form "%08x-%04x-%04x-%04x-%012x" 36 bytes plus the trailing '\0'. |
| 77 | + // Upon successfully parsing the input string, 0 is returned, and the UUID is stored in the location |
| 78 | + // pointed to by uu, otherwise -1 is returned. |
| 79 | + uuid_parse: function(inp, uu) { |
| 80 | + // int uuid_parse(const char *in, uuid_t uu); |
| 81 | + var inp = Pointer_stringify(inp); |
| 82 | + if (inp.length === 36) { |
| 83 | + var i = 0; |
| 84 | + var uuid = new Array(16); |
| 85 | + inp.toLowerCase().replace(/[0-9a-f]{2}/g, function(byte) { |
| 86 | + if (i < 16) { |
| 87 | + uuid[i++] = parseInt(byte, 16); |
| 88 | + } |
| 89 | + }); |
| 90 | + |
| 91 | + if (i < 16) { |
| 92 | + return -1; |
| 93 | + } else { |
| 94 | + writeArrayToMemory(uuid, uu); |
| 95 | + return 0; |
| 96 | + } |
| 97 | + } else { |
| 98 | + return -1; |
| 99 | + } |
| 100 | + }, |
| 101 | + |
| 102 | + // Convert a 'compact' form UUID to a string, if the upper parameter is supplied make the string upper case. |
| 103 | + uuid_unparse: function(uu, out, upper) { |
| 104 | + // void uuid_unparse(const uuid_t uu, char *out); |
| 105 | + var i = 0; |
| 106 | + var uuid = 'xxxx-xx-xx-xx-xxxxxx'.replace(/[x]/g, function(c) { |
| 107 | + var r = upper ? ({{{ makeGetValue('uu', 'i', 'i8', 0, 1) }}}).toString(16).toUpperCase() : |
| 108 | + ({{{ makeGetValue('uu', 'i', 'i8', 0, 1) }}}).toString(16); |
| 109 | + r = (r.length === 1) ? '0' + r : r; // Zero pad single digit hex values |
| 110 | + i++; |
| 111 | + return r; |
| 112 | + }); |
| 113 | + writeStringToMemory(uuid, out); |
| 114 | + }, |
| 115 | + |
| 116 | + // Convert a 'compact' form UUID to a lower case string. |
| 117 | + uuid_unparse_lower__deps: ['uuid_unparse'], |
| 118 | + uuid_unparse_lower: function(uu, out) { |
| 119 | + // void uuid_unparse_lower(const uuid_t uu, char *out); |
| 120 | + _uuid_unparse(uu, out); |
| 121 | + }, |
| 122 | + |
| 123 | + // Convert a 'compact' form UUID to an upper case string. |
| 124 | + uuid_unparse_upper__deps: ['uuid_unparse'], |
| 125 | + uuid_unparse_upper: function(uu, out) { |
| 126 | + // void uuid_unparse_upper(const uuid_t uu, char *out); |
| 127 | + _uuid_unparse(uu, out, true); |
| 128 | + }, |
| 129 | + |
| 130 | + uuid_type: function(uu) { |
| 131 | + // int uuid_type(const uuid_t uu); |
| 132 | + return {{{ cDefine('UUID_TYPE_DCE_RANDOM') }}}; |
| 133 | + }, |
| 134 | + |
| 135 | + uuid_variant: function(uu) { |
| 136 | + // int uuid_variant(const uuid_t uu); |
| 137 | + return {{{ cDefine('UUID_VARIANT_DCE') }}}; |
| 138 | + } |
| 139 | +}); |
| 140 | + |
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