| 1 | ;
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| 2 | Object.defineProperty(exports, "__esModule", { value: true });
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| 3 | exports.isUtf8 = void 0;
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| 4 | const toU8a_js_1 = require("../u8a/toU8a.js");
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| 5 | const string_js_1 = require("./string.js");
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| 6 | /**
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| 7 | * @name isUtf8
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| 8 | * @summary Tests if the input is valid Utf8
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| 9 | * @description
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| 10 | * Checks to see if the input string or Uint8Array is valid Utf8
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| 11 | */
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| 12 | function isUtf8(value) {
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| 13 | if (!value) {
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| 14 | return (0, string_js_1.isString)(value);
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| 15 | }
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| 16 | const u8a = (0, toU8a_js_1.u8aToU8a)(value);
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| 17 | const len = u8a.length;
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| 18 | let i = 0;
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| 19 | while (i < len) {
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| 20 | if (u8a[i] <= 0x7F) /* 00..7F */ {
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| 21 | i += 1;
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| 22 | }
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| 23 | else if (u8a[i] >= 0xC2 && u8a[i] <= 0xDF) /* C2..DF 80..BF */ {
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| 24 | if (i + 1 < len) /* Expect a 2nd byte */ {
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| 25 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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| 26 | // *message = "After a first byte between C2 and DF, expecting a 2nd byte between 80 and BF";
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| 27 | // *faulty_bytes = 2;
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| 28 | return false;
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| 29 | }
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| 30 | }
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| 31 | else {
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| 32 | // *message = "After a first byte between C2 and DF, expecting a 2nd byte.";
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| 33 | // *faulty_bytes = 1;
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| 34 | return false;
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| 35 | }
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| 36 | i += 2;
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| 37 | }
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| 38 | else if (u8a[i] === 0xE0) /* E0 A0..BF 80..BF */ {
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| 39 | if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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| 40 | if (u8a[i + 1] < 0xA0 || u8a[i + 1] > 0xBF) {
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| 41 | // *message = "After a first byte of E0, expecting a 2nd byte between A0 and BF.";
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| 42 | // *faulty_bytes = 2;
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| 43 | return false;
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| 44 | }
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| 45 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 46 | // *message = "After a first byte of E0, expecting a 3nd byte between 80 and BF.";
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| 47 | // *faulty_bytes = 3;
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| 48 | return false;
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| 49 | }
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| 50 | }
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| 51 | else {
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| 52 | // *message = "After a first byte of E0, expecting two following bytes.";
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| 53 | // *faulty_bytes = 1;
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| 54 | return false;
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| 55 | }
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| 56 | i += 3;
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| 57 | }
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| 58 | else if (u8a[i] >= 0xE1 && u8a[i] <= 0xEC) /* E1..EC 80..BF 80..BF */ {
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| 59 | if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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| 60 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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| 61 | // *message = "After a first byte between E1 and EC, expecting the 2nd byte between 80 and BF.";
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| 62 | // *faulty_bytes = 2;
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| 63 | return false;
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| 64 | }
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| 65 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 66 | // *message = "After a first byte between E1 and EC, expecting the 3rd byte between 80 and BF.";
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| 67 | // *faulty_bytes = 3;
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| 68 | return false;
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| 69 | }
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| 70 | }
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| 71 | else {
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| 72 | // *message = "After a first byte between E1 and EC, expecting two following bytes.";
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| 73 | // *faulty_bytes = 1;
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| 74 | return false;
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| 75 | }
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| 76 | i += 3;
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| 77 | }
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| 78 | else if (u8a[i] === 0xED) /* ED 80..9F 80..BF */ {
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| 79 | if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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| 80 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0x9F) {
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| 81 | // *message = "After a first byte of ED, expecting 2nd byte between 80 and 9F.";
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| 82 | // *faulty_bytes = 2;
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| 83 | return false;
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| 84 | }
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| 85 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 86 | // *message = "After a first byte of ED, expecting 3rd byte between 80 and BF.";
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| 87 | // *faulty_bytes = 3;
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| 88 | return false;
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| 89 | }
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| 90 | }
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| 91 | else {
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| 92 | // *message = "After a first byte of ED, expecting two following bytes.";
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| 93 | // *faulty_bytes = 1;
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| 94 | return false;
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| 95 | }
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| 96 | i += 3;
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| 97 | }
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| 98 | else if (u8a[i] >= 0xEE && u8a[i] <= 0xEF) /* EE..EF 80..BF 80..BF */ {
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| 99 | if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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| 100 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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| 101 | // *message = "After a first byte between EE and EF, expecting 2nd byte between 80 and BF.";
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| 102 | // *faulty_bytes = 2;
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| 103 | return false;
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| 104 | }
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| 105 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 106 | // *message = "After a first byte between EE and EF, expecting 3rd byte between 80 and BF.";
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| 107 | // *faulty_bytes = 3;
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| 108 | return false;
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| 109 | }
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| 110 | }
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| 111 | else {
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| 112 | // *message = "After a first byte between EE and EF, two following bytes.";
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| 113 | // *faulty_bytes = 1;
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| 114 | return false;
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| 115 | }
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| 116 | i += 3;
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| 117 | }
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| 118 | else if (u8a[i] === 0xF0) /* F0 90..BF 80..BF 80..BF */ {
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| 119 | if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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| 120 | if (u8a[i + 1] < 0x90 || u8a[i + 1] > 0xBF) {
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| 121 | // *message = "After a first byte of F0, expecting 2nd byte between 90 and BF.";
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| 122 | // *faulty_bytes = 2;
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| 123 | return false;
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| 124 | }
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| 125 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 126 | // *message = "After a first byte of F0, expecting 3rd byte between 80 and BF.";
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| 127 | // *faulty_bytes = 3;
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| 128 | return false;
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| 129 | }
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| 130 | if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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| 131 | // *message = "After a first byte of F0, expecting 4th byte between 80 and BF.";
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| 132 | // *faulty_bytes = 4;
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| 133 | return false;
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| 134 | }
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| 135 | }
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| 136 | else {
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| 137 | // *message = "After a first byte of F0, expecting three following bytes.";
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| 138 | // *faulty_bytes = 1;
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| 139 | return false;
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| 140 | }
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| 141 | i += 4;
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| 142 | }
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| 143 | else if (u8a[i] >= 0xF1 && u8a[i] <= 0xF3) /* F1..F3 80..BF 80..BF 80..BF */ {
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| 144 | if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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| 145 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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| 146 | // *message = "After a first byte of F1, F2, or F3, expecting a 2nd byte between 80 and BF.";
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| 147 | // *faulty_bytes = 2;
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| 148 | return false;
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| 149 | }
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| 150 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 151 | // *message = "After a first byte of F1, F2, or F3, expecting a 3rd byte between 80 and BF.";
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| 152 | // *faulty_bytes = 3;
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| 153 | return false;
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| 154 | }
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| 155 | if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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| 156 | // *message = "After a first byte of F1, F2, or F3, expecting a 4th byte between 80 and BF.";
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| 157 | // *faulty_bytes = 4;
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| 158 | return false;
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| 159 | }
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| 160 | }
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| 161 | else {
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| 162 | // *message = "After a first byte of F1, F2, or F3, expecting three following bytes.";
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| 163 | // *faulty_bytes = 1;
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| 164 | return false;
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| 165 | }
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| 166 | i += 4;
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| 167 | }
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| 168 | else if (u8a[i] === 0xF4) /* F4 80..8F 80..BF 80..BF */ {
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| 169 | if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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| 170 | if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0x8F) {
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| 171 | // *message = "After a first byte of F4, expecting 2nd byte between 80 and 8F.";
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| 172 | // *faulty_bytes = 2;
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| 173 | return false;
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| 174 | }
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| 175 | if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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| 176 | // *message = "After a first byte of F4, expecting 3rd byte between 80 and BF.";
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| 177 | // *faulty_bytes = 3;
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| 178 | return false;
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| 179 | }
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| 180 | if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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| 181 | // *message = "After a first byte of F4, expecting 4th byte between 80 and BF.";
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| 182 | // *faulty_bytes = 4;
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| 183 | return false;
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| 184 | }
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| 185 | }
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| 186 | else {
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| 187 | // *message = "After a first byte of F4, expecting three following bytes.";
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| 188 | // *faulty_bytes = 1;
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| 189 | return false;
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| 190 | }
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| 191 | i += 4;
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| 192 | }
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| 193 | else {
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| 194 | // *message = "Expecting bytes in the following ranges: 00..7F C2..F4.";
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| 195 | // *faulty_bytes = 1;
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| 196 | return false;
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| 197 | }
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| 198 | }
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| 199 | return true;
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| 200 | }
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| 201 | exports.isUtf8 = isUtf8;
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