Sha256: 492f2cfdbe88a365ed9715800e8339b85c16e624c1262d6f1aa35d79b3d2924b
Contents?: true
Size: 1.81 KB
Versions: 27
Compression:
Stored size: 1.81 KB
Contents
'use strict';
var forEach = require('for-each');
var callBind = require('call-bind');
var typedArrays = require('available-typed-arrays')();
var getters = {};
var hasProto = require('has-proto')();
var gOPD = Object.getOwnPropertyDescriptor;
var oDP = Object.defineProperty;
if (gOPD) {
var getByteOffset = function (x) {
return x.byteOffset;
};
forEach(typedArrays, function (typedArray) {
// In Safari 7, Typed Array constructors are typeof object
if (typeof global[typedArray] === 'function' || typeof global[typedArray] === 'object') {
var Proto = global[typedArray].prototype;
var descriptor = gOPD(Proto, 'byteOffset');
if (!descriptor && hasProto) {
var superProto = Proto.__proto__; // eslint-disable-line no-proto
descriptor = gOPD(superProto, 'byteOffset');
}
// Opera 12.16 has a magic byteOffset data property on instances AND on Proto
if (descriptor && descriptor.get) {
getters[typedArray] = callBind(descriptor.get);
} else if (oDP) {
// this is likely an engine where instances have a magic byteOffset data property
var arr = new global[typedArray](2);
descriptor = gOPD(arr, 'byteOffset');
if (descriptor && descriptor.configurable) {
oDP(arr, 'length', { value: 3 });
}
if (arr.length === 2) {
getters[typedArray] = getByteOffset;
}
}
}
});
}
var tryTypedArrays = function tryAllTypedArrays(value) {
var foundOffset;
forEach(getters, function (getter) {
if (typeof foundOffset !== 'number') {
try {
var offset = getter(value);
if (typeof offset === 'number') {
foundOffset = offset;
}
} catch (e) {}
}
});
return foundOffset;
};
var isTypedArray = require('is-typed-array');
module.exports = function typedArrayByteOffset(value) {
if (!isTypedArray(value)) {
return false;
}
return tryTypedArrays(value);
};
Version data entries
27 entries across 27 versions & 2 rubygems