I need to encode and decode IEEE 754 floats and doubles from binary in node.js to parse a network protocol.
Are there any existing libraries that do this, or do I have to read the spec and implement it myself? Or should I write a C module to do it?
Note that as of node 0.6 this functionality is included in the core library, so that is the new best way to do it.
See http://nodejs.org/docs/latest/api/buffer.html for details.
If you are reading/writing binary data structures you might consider using a friendly wrapper around this functionality to make things easier to read and maintain. Plug follows: https://github.com/dobesv/node-binstruct
This is the best way to do it: http://github.com/pgriess/node-jspack (perhaps if you need to do things on node < 0.6.)
I ported a C++ (made with GNU GMP) converter with float128 support to Emscripten so that it would run in the browser: https://github.com/ysangkok/ieee-754
Emscripten produces JavaScript that will run on Node.js too. You will get the float representation as a string of bits, though, I don't know if that's what you want.
Maybe you can see if this thing does what you want: http://jsfromhell.com/classes/binary-parser
来源：https://stackoverflow.com/questions/3740853/encoding-and-decoding-ieee-754-floats-in-javascript