node.js library for reading and extraction of ZIP archives. 

node.js library for reading and extraction of ZIP archives

antelle

node-stream-zip

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         * Alternatively, you can pass fd here

         * You will be able to work with entries inside zip archive,

         * otherwise the only way to access them is entry event

         * By default, entry name is checked for malicious characters, like ../ or c:\123,

         * pass this flag to disable validation error

        skipEntryNameValidation?: boolean;

         * @default automatic based on file size

         * Encoding used to decode file names

         * true if it's a directory entry

         * true if it's a file entry, see also isDirectory

         * uncompressed file crc-32 value

        constructor(config: StreamZipOptions);

        entry(name: string): Promise<ZipEntry | undefined>;

        entries(): Promise<{ [name: string]: ZipEntry }>;

        entryData(entry: string | ZipEntry): Promise<Buffer>;

        stream(entry: string | ZipEntry): Promise<NodeJS.ReadableStream>;

        extract(entry: string | ZipEntry | null, outPath: string): Promise<number | undefined>;

 * Portions copyright https://github.com/cthackers/adm-zip | https://raw.githubusercontent.com/cthackers/adm-zip/master/LICENSE

    LOCVER: 4, // version needed to extract

    LOCFLG: 6, // general purpose bit flag

    LOCTIM: 10, // modification time (2 bytes time, 2 bytes date)

    LOCCRC: 14, // uncompressed file crc-32 value

    EXTCRC: 4, // uncompressed file crc-32 value

    /* The central directory file header */

    CENVER: 6, // version needed to extract

    CENTIM: 12, // modification time (2 bytes time, 2 bytes date)

    CENCRC: 16, // uncompressed file crc-32 value

    CENATT: 36, // internal file attributes

    CENATX: 38, // external file attributes (host system dependent)

    /* The entries in the end of central directory */

    ENDSUB: 8, // number of entries on this disk

    ENDTOT: 10, // total number of entries

    ENDSIZ: 12, // central directory size in bytes

    ENDOFF: 16, // offset of first CEN header

    ENDCOM: 20, // zip file comment length

    /* The entries in the end of ZIP64 central directory locator */

    ENDL64HDR: 20, // ZIP64 end of central directory locator header size

    ENDL64SIG: 0x07064b50, // ZIP64 end of central directory locator signature

    ENDL64OFS: 8, // ZIP64 end of central directory offset

    /* The entries in the end of ZIP64 central directory */

    END64HDR: 56, // ZIP64 end of central directory header size

    END64SIG: 0x06064b50, // ZIP64 end of central directory signature

    END64SUB: 24, // number of entries on this disk

    END64TOT: 32, // total number of entries

    REDUCED1: 2, // reduced with compression factor 1

    REDUCED2: 3, // reduced with compression factor 2

    REDUCED3: 4, // reduced with compression factor 3

    REDUCED4: 5, // reduced with compression factor 4

    BZIP2: 12, //  compressed using BZIP2

    IBM_TERSE: 18, // compressed using IBM TERSE

        entries = config.storeEntries !== false ? {} : null,

        textDecoder = config.nameEncoding ? new TextDecoder(config.nameEncoding) : null;

            fs.open(fileName, 'r', (err, f) => {

                    return that.emit('error', err);

            chunkSize = config.chunkSize || Math.round(fileSize / 1000);

                Math.min(chunkSize, Math.min(128 * 1024, fileSize)),

    function readUntilFoundCallback(err, bytesRead) {

            return that.emit('error', err || new Error('Archive read error'));

        let bufferPosition = pos - op.win.position;

        while (--pos >= minPos && --bufferPosition >= 0) {

            if (buffer.length - bufferPosition >= 4 && buffer[bufferPosition] === op.firstByte) {

                // quick check first signature byte

                if (buffer.readUInt32LE(bufferPosition) === op.sig) {

                    op.lastBufferPosition = bufferPosition;

                    op.lastBytesRead = bytesRead;

            return that.emit('error', new Error('Bad archive'));

        const expandLength = Math.min(op.chunkSize, pos - minPos);

        op.win.expandLeft(expandLength, readUntilFoundCallback);

        const totalReadLength = Math.min(consts.ENDHDR + consts.MAXFILECOMMENT, fileSize);

            win: new FileWindowBuffer(fd),

            minPos: fileSize - totalReadLength,

            chunkSize: Math.min(1024, chunkSize),

            firstByte: consts.ENDSIGFIRST,

            complete: readCentralDirectoryComplete,

        op.win.read(fileSize - op.chunkSize, op.chunkSize, readUntilFoundCallback);

    function readCentralDirectoryComplete() {

        const pos = op.lastBufferPosition;

            centralDirectory = new CentralDirectoryHeader();

            centralDirectory.read(buffer.slice(pos, pos + consts.ENDHDR));

            centralDirectory.headerOffset = op.win.position + pos;

            if (centralDirectory.commentLength) {

                        pos + consts.ENDHDR,

                        pos + consts.ENDHDR + centralDirectory.commentLength

            that.entriesCount = centralDirectory.volumeEntries;

            that.centralDirectory = centralDirectory;

                (centralDirectory.volumeEntries === consts.EF_ZIP64_OR_16 &&

                    centralDirectory.totalEntries === consts.EF_ZIP64_OR_16) ||

                entry.read(buffer, bufferPos);

                entry.read(buffer, bufferPos, textDecoder);

                if (!config.skipEntryNameValidation) {

                    entry.validateName();

                    entries[entry.name] = entry;

		@@ -36,2 +36,8 @@ /// <reference types="node" />
		chunkSize?: number;

		/**
		* Encoding used to decode file names
		* @default UTF8
		*/
		nameEncoding?: string;
		}
		@@ -38,0 +44,0 @@

		@@ -143,3 +143,4 @@ /**
		entries = config.storeEntries !== false ? {} : null,
		fileName = config.file;
		fileName = config.file,
		textDecoder = config.nameEncoding ? new TextDecoder(config.nameEncoding) : null;

		@@ -347,3 +348,3 @@ open();
		}
		entry.read(buffer, bufferPos);
		entry.read(buffer, bufferPos, textDecoder);
		if (!config.skipEntryNameValidation) {
		@@ -882,4 +883,7 @@ entry.validateName();

		read(data, offset) {
		this.name = data.slice(offset, (offset += this.fnameLen)).toString();
		read(data, offset, textDecoder) {
		const nameData = data.slice(offset, (offset += this.fnameLen));
		this.name = textDecoder
		? textDecoder.decode(new Uint8Array(nameData))
		: nameData.toString('utf8');
		const lastChar = data[offset - 1];
		@@ -886,0 +890,0 @@ this.isDirectory = lastChar === 47 \|\| lastChar === 92;

		{
		"name": "node-stream-zip",
		"version": "1.14.0",
		"version": "1.15.0",
		"description": "node.js library for reading and extraction of ZIP archives",
		@@ -35,3 +35,3 @@ "keywords": [
		"engines": {
		"node": ">=0.10.0"
		"node": ">=0.12.0"
		},
		@@ -38,0 +38,0 @@ "devDependencies": {

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