109 lines
3.1 KiB
JavaScript
109 lines
3.1 KiB
JavaScript
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.UTF_32LE = exports.UTF_32BE = exports.UTF_16LE = exports.UTF_16BE = void 0;
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const match_1 = __importDefault(require("../match"));
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class UTF_16BE {
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name() {
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return 'UTF-16BE';
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}
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match(det) {
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const input = det.rawInput;
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if (input.length >= 2 &&
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(input[0] & 0xff) == 0xfe &&
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(input[1] & 0xff) == 0xff) {
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return (0, match_1.default)(det, this, 100);
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}
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return null;
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}
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}
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exports.UTF_16BE = UTF_16BE;
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class UTF_16LE {
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name() {
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return 'UTF-16LE';
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}
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match(det) {
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const input = det.rawInput;
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if (input.length >= 2 &&
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(input[0] & 0xff) == 0xff &&
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(input[1] & 0xff) == 0xfe) {
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if (input.length >= 4 && input[2] == 0x00 && input[3] == 0x00) {
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return null;
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}
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return (0, match_1.default)(det, this, 100);
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}
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return null;
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}
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}
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exports.UTF_16LE = UTF_16LE;
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class UTF_32 {
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name() {
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return 'UTF-32';
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}
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getChar(_input, _index) {
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return -1;
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}
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match(det) {
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let numValid = 0, numInvalid = 0, hasBOM = false, confidence = 0;
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const limit = (det.rawLen / 4) * 4;
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const input = det.rawInput;
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if (limit == 0) {
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return null;
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}
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if (this.getChar(input, 0) == 0x0000feff) {
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hasBOM = true;
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}
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for (let i = 0; i < limit; i += 4) {
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const ch = this.getChar(input, i);
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if (ch < 0 || ch >= 0x10ffff || (ch >= 0xd800 && ch <= 0xdfff)) {
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numInvalid += 1;
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}
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else {
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numValid += 1;
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}
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}
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if (hasBOM && numInvalid == 0) {
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confidence = 100;
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}
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else if (hasBOM && numValid > numInvalid * 10) {
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confidence = 80;
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}
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else if (numValid > 3 && numInvalid == 0) {
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confidence = 100;
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}
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else if (numValid > 0 && numInvalid == 0) {
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confidence = 80;
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}
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else if (numValid > numInvalid * 10) {
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confidence = 25;
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}
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return confidence == 0 ? null : (0, match_1.default)(det, this, confidence);
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}
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}
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class UTF_32BE extends UTF_32 {
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name() {
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return 'UTF-32BE';
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}
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getChar(input, index) {
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return (((input[index + 0] & 0xff) << 24) |
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((input[index + 1] & 0xff) << 16) |
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((input[index + 2] & 0xff) << 8) |
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(input[index + 3] & 0xff));
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}
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}
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exports.UTF_32BE = UTF_32BE;
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class UTF_32LE extends UTF_32 {
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name() {
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return 'UTF-32LE';
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}
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getChar(input, index) {
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return (((input[index + 3] & 0xff) << 24) |
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((input[index + 2] & 0xff) << 16) |
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((input[index + 1] & 0xff) << 8) |
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(input[index + 0] & 0xff));
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}
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}
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exports.UTF_32LE = UTF_32LE;
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//# sourceMappingURL=unicode.js.map
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