54 lines
2.1 KiB
JavaScript
54 lines
2.1 KiB
JavaScript
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/*
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* Duktape.Buffer polyfill for Duktape 1.x compatibility.
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*
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* Because plain buffer and other buffer behavior changed in Duktape 2.x
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* quite a bit, 100% matching behavior is not possible.
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*/
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if (typeof Duktape === 'object' && typeof Duktape.Buffer === 'undefined') {
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(function () {
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function isBufferOrView(v) {
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return v instanceof Buffer ||
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v instanceof ArrayBuffer ||
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v instanceof Uint8Array || // also matches plain buffer in 2.x
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v instanceof Uint8ClampedArray ||
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v instanceof Int8Array ||
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v instanceof Uint16Array ||
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v instanceof Int16Array ||
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v instanceof Uint32Array ||
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v instanceof Int32Array ||
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v instanceof Float32Array ||
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v instanceof Float64Array ||
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v instanceof DataView;
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}
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var fn = function Buffer(arg) {
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if (this instanceof fn) {
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// Constructor call (not 100% reliable check); result is an
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// ArrayBuffer (in 1.x Duktape.Buffer). For a buffer argument
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// the ArrayBuffer shares the argument's storage with any slice
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//offset/length lost.
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if (isBufferOrView(arg)) {
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return Object(Uint8Array.plainOf(arg));
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} else {
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return Object(Uint8Array.allocPlain(arg));
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}
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} else {
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// Normal call; result is a plain buffer. For a buffer argument the
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// underlying buffer is returned (shared, not copy). Otherwise a
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// new plain buffer is created.
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if (isBufferOrView(arg)) {
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return Uint8Array.plainOf(arg);
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} else {
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return Uint8Array.allocPlain(arg);
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}
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}
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};
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Object.defineProperty(Duktape, 'Buffer', {
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value: fn,
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writable: true,
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enumerable: false,
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configurable: true
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});
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})();
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}
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