Are there any modules that provide pack / unpack functionality for nodejs similar to python's struct module? I haven't found any specifically for node, and I'd assume that javascript implementations would be significantly slower.
Thanks.
https://github.com/pgriess/node-jspack appears to be a straight-up port of Python's struct API for packing binary data, but it's implemented in JS. It doesn't appear to be packaged for npm yet.
https://github.com/substack/node-binary provides unpacking, also implemented in JS, and you can install it with npm install binary if you have npm installed.
https://github.com/ryanrolds/bufferpack is another solution
jBinary is another tool in this space which seems to be actively maintained (as of late 2014). It includes sample specifications for a variety of well-known formats, e.g. tar, ico and mp3.
来源：https://stackoverflow.com/questions/5605108/pack-unpack-functions-for-node-js