mirror of
https://github.com/pezkuwichain/pezkuwi-common.git
synced 2026-04-22 23:08:01 +00:00
201 lines
8.3 KiB
JavaScript
201 lines
8.3 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.isUtf8 = isUtf8;
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const toU8a_js_1 = require("../u8a/toU8a.js");
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const string_js_1 = require("./string.js");
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/**
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* @name isUtf8
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* @summary Tests if the input is valid Utf8
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* @description
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* Checks to see if the input string or Uint8Array is valid Utf8
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*/
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function isUtf8(value) {
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if (!value) {
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return (0, string_js_1.isString)(value);
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}
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const u8a = (0, toU8a_js_1.u8aToU8a)(value);
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const len = u8a.length;
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let i = 0;
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while (i < len) {
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if (u8a[i] <= 0x7F) /* 00..7F */ {
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i += 1;
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}
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else if (u8a[i] >= 0xC2 && u8a[i] <= 0xDF) /* C2..DF 80..BF */ {
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if (i + 1 < len) /* Expect a 2nd byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte between C2 and DF, expecting a 2nd byte between 80 and BF";
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// *faulty_bytes = 2;
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return false;
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}
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}
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else {
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// *message = "After a first byte between C2 and DF, expecting a 2nd byte.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 2;
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}
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else if (u8a[i] === 0xE0) /* E0 A0..BF 80..BF */ {
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if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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if (u8a[i + 1] < 0xA0 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte of E0, expecting a 2nd byte between A0 and BF.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte of E0, expecting a 3nd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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}
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else {
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// *message = "After a first byte of E0, expecting two following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 3;
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}
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else if (u8a[i] >= 0xE1 && u8a[i] <= 0xEC) /* E1..EC 80..BF 80..BF */ {
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if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte between E1 and EC, expecting the 2nd byte between 80 and BF.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte between E1 and EC, expecting the 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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}
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else {
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// *message = "After a first byte between E1 and EC, expecting two following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 3;
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}
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else if (u8a[i] === 0xED) /* ED 80..9F 80..BF */ {
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if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0x9F) {
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// *message = "After a first byte of ED, expecting 2nd byte between 80 and 9F.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte of ED, expecting 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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}
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else {
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// *message = "After a first byte of ED, expecting two following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 3;
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}
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else if (u8a[i] >= 0xEE && u8a[i] <= 0xEF) /* EE..EF 80..BF 80..BF */ {
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if (i + 2 < len) /* Expect a 2nd and 3rd byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte between EE and EF, expecting 2nd byte between 80 and BF.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte between EE and EF, expecting 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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}
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else {
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// *message = "After a first byte between EE and EF, two following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 3;
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}
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else if (u8a[i] === 0xF0) /* F0 90..BF 80..BF 80..BF */ {
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if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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if (u8a[i + 1] < 0x90 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte of F0, expecting 2nd byte between 90 and BF.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte of F0, expecting 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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// *message = "After a first byte of F0, expecting 4th byte between 80 and BF.";
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// *faulty_bytes = 4;
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return false;
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}
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}
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else {
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// *message = "After a first byte of F0, expecting three following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 4;
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}
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else if (u8a[i] >= 0xF1 && u8a[i] <= 0xF3) /* F1..F3 80..BF 80..BF 80..BF */ {
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if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0xBF) {
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// *message = "After a first byte of F1, F2, or F3, expecting a 2nd byte between 80 and BF.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte of F1, F2, or F3, expecting a 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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// *message = "After a first byte of F1, F2, or F3, expecting a 4th byte between 80 and BF.";
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// *faulty_bytes = 4;
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return false;
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}
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}
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else {
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// *message = "After a first byte of F1, F2, or F3, expecting three following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 4;
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}
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else if (u8a[i] === 0xF4) /* F4 80..8F 80..BF 80..BF */ {
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if (i + 3 < len) /* Expect a 2nd, 3rd 3th byte */ {
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if (u8a[i + 1] < 0x80 || u8a[i + 1] > 0x8F) {
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// *message = "After a first byte of F4, expecting 2nd byte between 80 and 8F.";
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// *faulty_bytes = 2;
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return false;
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}
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if (u8a[i + 2] < 0x80 || u8a[i + 2] > 0xBF) {
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// *message = "After a first byte of F4, expecting 3rd byte between 80 and BF.";
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// *faulty_bytes = 3;
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return false;
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}
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if (u8a[i + 3] < 0x80 || u8a[i + 3] > 0xBF) {
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// *message = "After a first byte of F4, expecting 4th byte between 80 and BF.";
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// *faulty_bytes = 4;
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return false;
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}
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}
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else {
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// *message = "After a first byte of F4, expecting three following bytes.";
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// *faulty_bytes = 1;
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return false;
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}
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i += 4;
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}
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else {
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// *message = "Expecting bytes in the following ranges: 00..7F C2..F4.";
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// *faulty_bytes = 1;
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return false;
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}
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}
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return true;
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}
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