Package Exports

h5wasm-plugins
h5wasm-plugins/index.mjs

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (h5wasm-plugins) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

h5wasm-plugins

A collection of pre-compiled compression plugins to be used with h5wasm

The plugins are built using sources fetched at build-time from https://github.com/HDFGroup/hdf5_plugins (if new plugins are desired, it is recommended to get them upstreamed to that repository so they can be built here)

(h5wasm is a javascript/webassembly library for reading and writing HDF5 files from the browser or node.js or deno or...)

Installation

npm install h5wasm-plugins

(this will also install h5wasm >= 0.6.7)

Included plugins

blosc
bshuf
bz2
lz4
lzf
szf
zfp
zstd

(Note that gzip and szip filters are built-in to h5wasm and don't require a plugin)

Usage: browser

The default export from h5wasm (which has a Module property defined, for accessing the C-module directly) should be passed to the functions defined here.

import h5wasm from "h5wasm";
import { plugin_names, install_plugins } from "h5wasm-plugins";

await h5wasm.ready;
// installs libH5Zzfp.so to default folder, /usr/local/hdf5/lib/plugin
install_plugins(h5wasm, ["zfp"]);

// Or, to install all plugins to new folder /tmp/h5plugins
// install_plugins(h5wasm, plugin_names, "/tmp/h5plugins");

// open existing file - see h5wasm docs for writing files to
// virtual Emscripten filesystem
const f = new h5wasm.File("my_zfp.h5", "r");
const data = f.get("zfp_data").value;

Usage: server side (e.g. nodejs)

const h5wasm = await import("h5wasm");
const h5wasm_plugins = await import("h5wasm-plugins");

await h5wasm.ready;
// this inserts the node_modules/h5wasm-plugins/plugins path
// at the start of the HDF5 plugin search paths
h5wasm_plugins.install_local_plugins(h5wasm);

const f = new h5wasm.File('./test_zfp.h5', 'r');
// File {
//   path: '/',
//   file_id: 72057594037927936n,
//   type: 'Group',
//   filename: './test_zfp.h5',
//   mode: 'r'
// }

f.get('data').filters
// [
//   {
//     id: 32013,
//     name: 'H5Z-ZFP-1.1.0 (ZFP-0.5.5)',
//     cd_values: [ 89149712, 91252346, 146, 4293918720, 3767009280, 493487 ]
//   }
// ]

f.get('data').value 
// Float32Array(10) [
//   0, 1, 2, 3, 4,
//   5, 6, 7, 8, 9
// ]

h5wasm.Module.get_plugin_search_paths()
// [
//   '/home/bbm/dev/test_plugins/node_modules/h5wasm-plugins/plugins',
//   '/usr/local/hdf5/lib/plugin'
// ]

Building from source

Dependencies:

cmake >= 3.24
make
emscripten, preferably version 3.1.43

run make to build the plugins to the plugins folder locally.