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Viewing file:     ZipHandler.js (10.19 KB)      -rw-r--r--

import { StringType, UINT32_LE } from 'token-types';
import initDebug from 'debug';
import { DataDescriptor, EndOfCentralDirectoryRecordToken, FileHeader, LocalFileHeaderToken, Signature } from "./ZipToken.js";
function signatureToArray(signature) {
    const signatureBytes = new Uint8Array(UINT32_LE.len);
    UINT32_LE.put(signatureBytes, 0, signature);
    return signatureBytes;
}
const debug = initDebug('tokenizer:inflate');
const syncBufferSize = 256 * 1024;
const ddSignatureArray = signatureToArray(Signature.DataDescriptor);
const eocdSignatureBytes = signatureToArray(Signature.EndOfCentralDirectory);
export class ZipHandler {
    constructor(tokenizer) {
        this.tokenizer = tokenizer;
        this.syncBuffer = new Uint8Array(syncBufferSize);
    }
    async isZip() {
        return await this.peekSignature() === Signature.LocalFileHeader;
    }
    peekSignature() {
        return this.tokenizer.peekToken(UINT32_LE);
    }
    async findEndOfCentralDirectoryLocator() {
        const randomReadTokenizer = this.tokenizer;
        const chunkLength = Math.min(16 * 1024, randomReadTokenizer.fileInfo.size);
        const buffer = this.syncBuffer.subarray(0, chunkLength);
        await this.tokenizer.readBuffer(buffer, { position: randomReadTokenizer.fileInfo.size - chunkLength });
        // Search the buffer from end to beginning for EOCD signature
        // const signature = 0x06054b50;
        for (let i = buffer.length - 4; i >= 0; i--) {
            // Compare 4 bytes directly without calling readUInt32LE
            if (buffer[i] === eocdSignatureBytes[0] &&
                buffer[i + 1] === eocdSignatureBytes[1] &&
                buffer[i + 2] === eocdSignatureBytes[2] &&
                buffer[i + 3] === eocdSignatureBytes[3]) {
                return randomReadTokenizer.fileInfo.size - chunkLength + i;
            }
        }
        return -1;
    }
    async readCentralDirectory() {
        if (!this.tokenizer.supportsRandomAccess()) {
            debug('Cannot reading central-directory without random-read support');
            return;
        }
        debug('Reading central-directory...');
        const pos = this.tokenizer.position;
        const offset = await this.findEndOfCentralDirectoryLocator();
        if (offset > 0) {
            debug('Central-directory 32-bit signature found');
            const eocdHeader = await this.tokenizer.readToken(EndOfCentralDirectoryRecordToken, offset);
            const files = [];
            this.tokenizer.setPosition(eocdHeader.offsetOfStartOfCd);
            for (let n = 0; n < eocdHeader.nrOfEntriesOfSize; ++n) {
                const entry = await this.tokenizer.readToken(FileHeader);
                if (entry.signature !== Signature.CentralFileHeader) {
                    throw new Error('Expected Central-File-Header signature');
                }
                entry.filename = await this.tokenizer.readToken(new StringType(entry.filenameLength, 'utf-8'));
                await this.tokenizer.ignore(entry.extraFieldLength);
                await this.tokenizer.ignore(entry.fileCommentLength);
                files.push(entry);
                debug(`Add central-directory file-entry: n=${n + 1}/${files.length}: filename=${files[n].filename}`);
            }
            this.tokenizer.setPosition(pos);
            return files;
        }
        this.tokenizer.setPosition(pos);
    }
    async unzip(fileCb) {
        const entries = await this.readCentralDirectory();
        if (entries) {
            // Use Central Directory to iterate over files
            return this.iterateOverCentralDirectory(entries, fileCb);
        }
        // Scan Zip files for local-file-header
        let stop = false;
        do {
            const zipHeader = await this.readLocalFileHeader();
            if (!zipHeader)
                break;
            const next = fileCb(zipHeader);
            stop = !!next.stop;
            let fileData;
            await this.tokenizer.ignore(zipHeader.extraFieldLength);
            if (zipHeader.dataDescriptor && zipHeader.compressedSize === 0) {
                const chunks = [];
                let len = syncBufferSize;
                debug('Compressed-file-size unknown, scanning for next data-descriptor-signature....');
                let nextHeaderIndex = -1;
                while (nextHeaderIndex < 0 && len === syncBufferSize) {
                    len = await this.tokenizer.peekBuffer(this.syncBuffer, { mayBeLess: true });
                    nextHeaderIndex = indexOf(this.syncBuffer.subarray(0, len), ddSignatureArray);
                    const size = nextHeaderIndex >= 0 ? nextHeaderIndex : len;
                    if (next.handler) {
                        const data = new Uint8Array(size);
                        await this.tokenizer.readBuffer(data);
                        chunks.push(data);
                    }
                    else {
                        // Move position to the next header if found, skip the whole buffer otherwise
                        await this.tokenizer.ignore(size);
                    }
                }
                debug(`Found data-descriptor-signature at pos=${this.tokenizer.position}`);
                if (next.handler) {
                    await this.inflate(zipHeader, mergeArrays(chunks), next.handler);
                }
            }
            else {
                if (next.handler) {
                    debug(`Reading compressed-file-data: ${zipHeader.compressedSize} bytes`);
                    fileData = new Uint8Array(zipHeader.compressedSize);
                    await this.tokenizer.readBuffer(fileData);
                    await this.inflate(zipHeader, fileData, next.handler);
                }
                else {
                    debug(`Ignoring compressed-file-data: ${zipHeader.compressedSize} bytes`);
                    await this.tokenizer.ignore(zipHeader.compressedSize);
                }
            }
            debug(`Reading data-descriptor at pos=${this.tokenizer.position}`);
            if (zipHeader.dataDescriptor) {
                // await this.tokenizer.ignore(DataDescriptor.len);
                const dataDescriptor = await this.tokenizer.readToken(DataDescriptor);
                if (dataDescriptor.signature !== 0x08074b50) {
                    throw new Error(`Expected data-descriptor-signature at position ${this.tokenizer.position - DataDescriptor.len}`);
                }
            }
        } while (!stop);
    }
    async iterateOverCentralDirectory(entries, fileCb) {
        for (const fileHeader of entries) {
            const next = fileCb(fileHeader);
            if (next.handler) {
                this.tokenizer.setPosition(fileHeader.relativeOffsetOfLocalHeader);
                const zipHeader = await this.readLocalFileHeader();
                if (zipHeader) {
                    await this.tokenizer.ignore(zipHeader.extraFieldLength);
                    const fileData = new Uint8Array(fileHeader.compressedSize);
                    await this.tokenizer.readBuffer(fileData);
                    await this.inflate(zipHeader, fileData, next.handler);
                }
            }
            if (next.stop)
                break;
        }
    }
    async inflate(zipHeader, fileData, cb) {
        if (zipHeader.compressedMethod === 0) {
            // Stored (uncompressed)
            return cb(fileData);
        }
        if (zipHeader.compressedMethod !== 8) {
            throw new Error(`Unsupported ZIP compression method: ${zipHeader.compressedMethod}`);
        }
        debug(`Decompress filename=${zipHeader.filename}, compressed-size=${fileData.length}`);
        const uncompressedData = await ZipHandler.decompressDeflateRaw(fileData);
        return cb(uncompressedData);
    }
    static async decompressDeflateRaw(data) {
        // Wrap Uint8Array in a ReadableStream without copying
        const input = new ReadableStream({
            start(controller) {
                controller.enqueue(data);
                controller.close();
            }
        });
        const ds = new DecompressionStream("deflate-raw");
        const output = input.pipeThrough(ds);
        try {
            // Collect decompressed bytes from the output stream
            const response = new Response(output);
            const buffer = await response.arrayBuffer();
            return new Uint8Array(buffer);
        }
        catch (err) {
            // Provide ZIP-specific error context
            const message = err instanceof Error
                ? `Failed to deflate ZIP entry: ${err.message}`
                : "Unknown decompression error in ZIP entry";
            throw new TypeError(message);
        }
    }
    async readLocalFileHeader() {
        const signature = await this.tokenizer.peekToken(UINT32_LE);
        if (signature === Signature.LocalFileHeader) {
            const header = await this.tokenizer.readToken(LocalFileHeaderToken);
            header.filename = await this.tokenizer.readToken(new StringType(header.filenameLength, 'utf-8'));
            return header;
        }
        if (signature === Signature.CentralFileHeader) {
            return false;
        }
        if (signature === 0xE011CFD0) {
            throw new Error('Encrypted ZIP');
        }
        throw new Error('Unexpected signature');
    }
}
function indexOf(buffer, portion) {
    const bufferLength = buffer.length;
    const portionLength = portion.length;
    // Return -1 if the portion is longer than the buffer
    if (portionLength > bufferLength)
        return -1;
    // Search for the portion in the buffer
    for (let i = 0; i <= bufferLength - portionLength; i++) {
        let found = true;
        for (let j = 0; j < portionLength; j++) {
            if (buffer[i + j] !== portion[j]) {
                found = false;
                break;
            }
        }
        if (found) {
            return i; // Return the starting offset
        }
    }
    return -1; // Not found
}
function mergeArrays(chunks) {
    // Concatenate chunks into a single Uint8Array
    const totalLength = chunks.reduce((acc, curr) => acc + curr.length, 0);
    const mergedArray = new Uint8Array(totalLength);
    let offset = 0;
    for (const chunk of chunks) {
        mergedArray.set(chunk, offset);
        offset += chunk.length;
    }
    return mergedArray;
}