random-access-zip v1.0.1
random-access-zip
Extract individual files from a zipfile on disk
I wanted a way to read individual files efficiently from a zipfile without extracting the whole zipfile, and couldn't find an existing library with an API that I liked. Uses yauzl
under the hood. This might be slow for zip files with hundreds of entries, because it reads through the entire central directory before returning any files. The entire central directory is also stored in memory, but the zipfile is not stored in memory and files are streamed from disk, so memory usage should be low. See all the limitations of yauzl
which also apply to this library.
Table of Contents
Install
npm install random-access-zip
Usage
Works similarly to fs.createReadStream()
and fs.readFile()
.
const Raz = require("random-access-zip");
const zip = new Raz("my_zip_file.zip");
const rs = zip.createReadStream("a.txt", "utf8");
// Pipe to console
rs.pipe(process.stdout);
// Cleanup after
rs.on("end", () => zip.close());
API
const zip = new RandomAccessZip(path[, cb])
Create a new random access zipfile reader for a zipfile at path
. The optional callback will be called when the zipfile is ready to read, or if there is an error reading the zipfile. However, you do not need to wait for this in order to call the read methods.
zip.createReadStream(filename, opts)
Returns a ReadableStream with the contents of the file filename
in the zipfile. opts
can be a string encoding option, or an object with the property opts.encoding
. If no encoding is specified, then the raw buffer is returned.
zip.readFile(filename, opts, callback)
callback
is passed two arguments (err, data)
where data
is the contents of the file filename
in the zipfile. opts
can be a string encoding option, or an object with the property opts.encoding
. If no encoding is specified, then the raw buffer is returned.
zip.close()
Close the zipfile (cleans up the file descriptor).
Maintainers
Contributing
PRs accepted.
Small note: If editing the README, please conform to the standard-readme specification.
License
MIT © 2019 Gregor MacLennan
5 years ago