The node libzim package binds to the zimlib library from OpenZIM to allow read/write access to ZIM files.

var zim = require('libzim');

class TestArticle extends zim.writer.Article {
  constructor(id) {
    super();
    this._id = id;
    this._data = new Buffer("this is article " + id);
  }
  getAid() { return this._id; }
  getNamespace() { return 'A'; }
  getUrl() { return this._id; }
  getTitle() { return this._id; }
  isRedirect() { return false; }
  getMimeType() { return "text/plain"; }
  getRedirectAid() { return ""; }
  getData() {
    return new zim.Blob(this._data);
  }
}

class TestArticleSource extends zim.writer.ArticleSource {
  constructor(max = 16, szfunc) {
    super();
    this._next = 0;
    this._articles = [];
    this.getCurrentSize = szfunc;
    for (var n = 0; n < max ; n++) {
      this._articles[n] = new TestArticle("" + (n+1));
    }
  }
  getNextArticle() {
    console.log('After ' + this._next + ' articles:',
                this.getCurrentSize(), 'bytes');
    return this._articles[this._next++];
  }
}

c = new zim.writer.ZimCreator();
src = new TestArticleSource(8, () => c.getCurrentSize());
c.create("foo.zim", src);

You can use npm to download and install:

• The latest libzim package: npm install libzim

• GitHub's master branch: npm install https://github.com/cscott/node-libzim/tarball/master

In both cases the module is automatically built with npm's internal version of node-gyp, and thus your system must meet node-gyp's requirements.

It is also possible to make your own build of libzim from its source instead of its npm package (see below).

Unless building via npm install (which uses its own node-gyp) you will need node-gyp installed globally:

npm install node-gyp -g

The libzim module depends only on the zimlib library from OpenZIM. By default, an internal/bundled copy of OpenZIM's zimlib will be built and statically linked, so an externally installed zimlib is not required.

If you wish to install against an external zimlib then you need to pass the --libzim argument to node-gyp, npm install or the configure wrapper.

./configure --libzim=external
make

Or, using the node-gyp directly:

 node-gyp --libzim=external rebuild

Or, using npm:

 npm install --libzim=external

If building against an external zimlib make sure to have the development headers available. Mac OS X ships with these by default. If you don't have them installed, install the -dev package with your package manager, e.g. apt-get install libzim-dev for Debian/Ubuntu.

mocha is required to run unit tests.

npm install mocha
npm test

We follow the zimlib API closely where possible.

Creates an object representing the data in the supplied node [Buffer][].

Returns a buffer object containing the data represented by this blob. This buffer is live: changing the values in the buffer will change the data in the blob.

Returns the (uncompressed) number of bytes of data in this blob.

Integer index used as the mime type for redirect articles.

Integer index used as the mime type for link target articles.

Integer index used as the mime type for deleted articles.

• C. Scott Ananian

• OpenZIM

Copyright (c) 2016 C. Scott Ananian.

libzim is licensed using the same license as the zimlib library in OpenZIM: GPLv2.