66 lines
1.3 KiB
JavaScript
66 lines
1.3 KiB
JavaScript
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var Buffer = require('buffer/').Buffer;
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/**
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* This is a polyfill for the static method `isView` of `ArrayBuffer`, which is
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* e.g. missing in IE 10.
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*
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* @api private
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*/
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if (
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typeof ArrayBuffer !== 'undefined' &&
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typeof ArrayBuffer.isView === 'undefined'
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) {
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ArrayBuffer.isView = function(arg) {
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return viewStrings.indexOf(Object.prototype.toString.call(arg)) > -1;
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};
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}
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/**
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* @api private
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*/
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var viewStrings = [
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'[object Int8Array]',
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'[object Uint8Array]',
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'[object Uint8ClampedArray]',
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'[object Int16Array]',
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'[object Uint16Array]',
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'[object Int32Array]',
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'[object Uint32Array]',
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'[object Float32Array]',
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'[object Float64Array]',
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'[object DataView]',
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];
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/**
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* @api private
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*/
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function isEmptyData(data) {
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if (typeof data === 'string') {
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return data.length === 0;
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}
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return data.byteLength === 0;
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}
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/**
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* @api private
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*/
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function convertToBuffer(data) {
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if (typeof data === 'string') {
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data = new Buffer(data, 'utf8');
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}
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if (ArrayBuffer.isView(data)) {
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return new Uint8Array(data.buffer, data.byteOffset, data.byteLength / Uint8Array.BYTES_PER_ELEMENT);
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}
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return new Uint8Array(data);
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}
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/**
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* @api private
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*/
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module.exports = exports = {
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isEmptyData: isEmptyData,
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convertToBuffer: convertToBuffer,
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};
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