tftsr-devops_investigation/node_modules/chardet/lib/encoding/unicode.js

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