fs-nextra/dist/utils/Header.js

Node.js fs next-gen extra (nextra) methods.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Header = void 0;
class Header {
    constructor(data) {
        const headerData = Header.resolve(data);
        /* istanbul ignore next: Requires a tar made by another program */
        this.filename = headerData.filename || '';
        this.mode = headerData.mode;
        this.uid = headerData.uid;
        this.gid = headerData.gid;
        this.size = headerData.size;
        this.mtime = headerData.mtime;
        this.type = headerData.type || 0;
        this.linkName = headerData.linkName || '';
        /* istanbul ignore next: Requires a tar made by another program */
        this.ustar = headerData.ustar || '';
        this.owner = headerData.owner || '';
        this.group = headerData.group || '';
        this.majorNumber = headerData.majorNumber || 0;
        this.minorNumber = headerData.minorNumber || 0;
        this.filenamePrefix = headerData.filenamePrefix || '';
        /* istanbul ignore next: Requires a bad tar file */
        if (headerData.checksum && headerData.checksum !== this.checksum)
            throw new Error(`Checksum not equal: ${headerData.checksum} != ${this.checksum}`);
    }
    get checksum() {
        let checksum = 0;
        checksum += Header.checksum(this.filename);
        checksum += Header.checksum(Header.pad(this.mode, 7));
        checksum += Header.checksum(Header.pad(this.uid, 7));
        checksum += Header.checksum(Header.pad(this.gid, 7));
        checksum += Header.checksum(Header.pad(this.size, 11));
        checksum += Header.checksum(Header.pad(this.mtime, 11));
        // blank checksum
        checksum += Header.checksum('        ');
        checksum += Header.checksum(Header.pad(this.type, 0));
        /* istanbul ignore next: Requires a tar made by another program */
        if (!/ustar/.test(this.ustar))
            return checksum;
        checksum += Header.checksum(this.ustar);
        checksum += Header.checksum(this.owner);
        checksum += Header.checksum(this.group);
        checksum += Header.checksum(Header.pad(this.majorNumber, 7));
        checksum += Header.checksum(Header.pad(this.minorNumber, 7));
        checksum += Header.checksum(this.filenamePrefix);
        return checksum;
    }
    toBuffer() {
        const header = Buffer.alloc(512);
        header.write(this.filename, 0);
        header.write(Header.pad(this.mode, 7), 100);
        header.write(Header.pad(this.uid, 7), 108);
        header.write(Header.pad(this.gid, 7), 116);
        header.write(Header.pad(this.size, 11), 124);
        header.write(Header.pad(this.mtime, 11), 136);
        header.write(Header.pad(this.checksum, 5) + String.fromCharCode(0, 0x20), 148);
        header.write(Header.pad(this.type, 0), 156);
        header.write(this.linkName, 157);
        header.write(this.ustar, 257);
        header.write(this.owner, 265);
        header.write(this.group, 297);
        header.write(Header.pad(this.majorNumber, 7), 329);
        header.write(Header.pad(this.minorNumber, 7), 337);
        header.write(this.filenamePrefix, 345);
        return header;
    }
    static resolve(data) {
        if (!(data instanceof Buffer))
            return data;
        return {
            filename: Header.readString(data.slice(0, 100)),
            mode: Header.readInt(data.slice(100, 108)),
            uid: Header.readInt(data.slice(108, 116)),
            gid: Header.readInt(data.slice(116, 124)),
            size: Header.readInt(data.slice(124, 136)),
            mtime: Header.readInt(data.slice(136, 148)),
            checksum: Header.readInt(data.slice(148, 156)),
            type: Header.readInt(data.slice(156, 157)),
            linkName: Header.readString(data.slice(157, 257)),
            ustar: Header.readString(data.slice(257, 265)),
            owner: Header.readString(data.slice(265, 297)),
            group: Header.readString(data.slice(297, 329)),
            majorNumber: Header.readInt(data.slice(329, 337)),
            minorNumber: Header.readInt(data.slice(337, 345)),
            filenamePrefix: Header.readString(data.slice(345, 500))
        };
    }
    static checksum(value) {
        let checksum = 0;
        for (let i = 0, { length } = value; i < length; i++)
            checksum += value.charCodeAt(i);
        return checksum;
    }
    static readInt(buffer) {
        return parseInt(buffer.toString(), 8) || 0;
    }
    static readString(buffer) {
        for (let i = 0, { length } = buffer; i < length; i++)
            if (buffer[i] === 0)
                return buffer.toString('utf8', 0, i);
        /* istanbul ignore next: Probably wont happen */
        return '';
    }
    static pad(num, bytes, base = 8) {
        return num.toString(base).padStart(bytes, '0');
    }
}
exports.Header = Header;
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