web0715/13.webpack/demo1/node_modules/@jsonjoy.com/util/lib/buffers/utf8/decodeAscii.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decodeAsciiMax15 = exports.decodeAscii = void 0;
const fromCharCode = String.fromCharCode;
const decodeAscii = (src, position, length) => {
    const bytes = [];
    for (let i = 0; i < length; i++) {
        const byte = src[position++];
        if (byte & 0x80)
            return;
        bytes.push(byte);
    }
    return fromCharCode.apply(String, bytes);
};
exports.decodeAscii = decodeAscii;
const decodeAsciiMax15 = (src, position, length) => {
    if (length < 4) {
        if (length < 2) {
            if (length === 0)
                return '';
            else {
                const a = src[position++];
                if ((a & 0x80) > 1) {
                    position -= 1;
                    return;
                }
                return fromCharCode(a);
            }
        }
        else {
            const a = src[position++];
            const b = src[position++];
            if ((a & 0x80) > 0 || (b & 0x80) > 0) {
                position -= 2;
                return;
            }
            if (length < 3)
                return fromCharCode(a, b);
            const c = src[position++];
            if ((c & 0x80) > 0) {
                position -= 3;
                return;
            }
            return fromCharCode(a, b, c);
        }
    }
    else {
        const a = src[position++];
        const b = src[position++];
        const c = src[position++];
        const d = src[position++];
        if ((a & 0x80) > 0 || (b & 0x80) > 0 || (c & 0x80) > 0 || (d & 0x80) > 0) {
            position -= 4;
            return;
        }
        if (length < 6) {
            if (length === 4)
                return fromCharCode(a, b, c, d);
            else {
                const e = src[position++];
                if ((e & 0x80) > 0) {
                    position -= 5;
                    return;
                }
                return fromCharCode(a, b, c, d, e);
            }
        }
        else if (length < 8) {
            const e = src[position++];
            const f = src[position++];
            if ((e & 0x80) > 0 || (f & 0x80) > 0) {
                position -= 6;
                return;
            }
            if (length < 7)
                return fromCharCode(a, b, c, d, e, f);
            const g = src[position++];
            if ((g & 0x80) > 0) {
                position -= 7;
                return;
            }
            return fromCharCode(a, b, c, d, e, f, g);
        }
        else {
            const e = src[position++];
            const f = src[position++];
            const g = src[position++];
            const h = src[position++];
            if ((e & 0x80) > 0 || (f & 0x80) > 0 || (g & 0x80) > 0 || (h & 0x80) > 0) {
                position -= 8;
                return;
            }
            if (length < 10) {
                if (length === 8)
                    return fromCharCode(a, b, c, d, e, f, g, h);
                else {
                    const i = src[position++];
                    if ((i & 0x80) > 0) {
                        position -= 9;
                        return;
                    }
                    return fromCharCode(a, b, c, d, e, f, g, h, i);
                }
            }
            else if (length < 12) {
                const i = src[position++];
                const j = src[position++];
                if ((i & 0x80) > 0 || (j & 0x80) > 0) {
                    position -= 10;
                    return;
                }
                if (length < 11)
                    return fromCharCode(a, b, c, d, e, f, g, h, i, j);
                const k = src[position++];
                if ((k & 0x80) > 0) {
                    position -= 11;
                    return;
                }
                return fromCharCode(a, b, c, d, e, f, g, h, i, j, k);
            }
            else {
                const i = src[position++];
                const j = src[position++];
                const k = src[position++];
                const l = src[position++];
                if ((i & 0x80) > 0 || (j & 0x80) > 0 || (k & 0x80) > 0 || (l & 0x80) > 0) {
                    position -= 12;
                    return;
                }
                if (length < 14) {
                    if (length === 12)
                        return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l);
                    else {
                        const m = src[position++];
                        if ((m & 0x80) > 0) {
                            position -= 13;
                            return;
                        }
                        return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m);
                    }
                }
                else {
                    const m = src[position++];
                    const n = src[position++];
                    if ((m & 0x80) > 0 || (n & 0x80) > 0) {
                        position -= 14;
                        return;
                    }
                    if (length < 15)
                        return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m, n);
                    const o = src[position++];
                    if ((o & 0x80) > 0) {
                        position -= 15;
                        return;
                    }
                    return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o);
                }
            }
        }
    }
};
exports.decodeAsciiMax15 = decodeAsciiMax15;
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