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