82 lines
1.9 KiB
JavaScript
82 lines
1.9 KiB
JavaScript
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'use strict';
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/**
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* Module dependencies.
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*/
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const DynamicLibrary = require('./dynamic_library');
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const ForeignFunction = require('./foreign_function');
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const VariadicForeignFunction = require('./foreign_function_var');
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const debug = require('debug')('ffi:Library');
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const RTLD_NOW = DynamicLibrary.FLAGS.RTLD_NOW;
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/**
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* The extension to use on libraries.
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* i.e. libm -> libm.so on linux
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*/
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const EXT = Library.EXT = {
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'linux': '.so',
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'linux2': '.so',
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'sunos': '.so',
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'solaris':'.so',
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'freebsd':'.so',
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'openbsd':'.so',
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'darwin': '.dylib',
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'mac': '.dylib',
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'win32': '.dll'
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}[process.platform];
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/**
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* Provides a friendly abstraction/API on-top of DynamicLibrary and
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* ForeignFunction.
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*/
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function Library (libfile, funcs, lib) {
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debug('creating Library object for', libfile);
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if (libfile && typeof libfile === 'string' && libfile.indexOf(EXT) === -1) {
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debug('appending library extension to library name', EXT);
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libfile += EXT;
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}
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if (!lib) {
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lib = {};
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}
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let dl;
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if (typeof libfile === 'string' || !libfile) {
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dl = new DynamicLibrary(libfile || null, RTLD_NOW);
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} else {
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dl = libfile;
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}
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Object.keys(funcs || {}).forEach(function (func) {
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debug('defining function', func);
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const fptr = dl.get(func);
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const info = funcs[func];
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if (fptr.isNull()) {
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throw new Error('Library: "' + dl.path()
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+ '" returned NULL function pointer for "' + func + '"');
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}
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const resultType = info[0];
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const paramTypes = info[1];
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const fopts = info[2];
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const abi = fopts && fopts.abi;
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const async = fopts && fopts.async;
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const varargs = fopts && fopts.varargs;
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if (varargs) {
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lib[func] = VariadicForeignFunction(fptr, resultType, paramTypes, abi);
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} else {
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const ff = ForeignFunction(fptr, resultType, paramTypes, abi);
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lib[func] = async ? ff.async : ff;
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}
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});
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return lib;
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}
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module.exports = Library;
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