You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
2.3 KiB
46 lines
2.3 KiB
4 weeks ago
|
'use strict';
|
||
|
|
var globalThis = require('../internals/global-this');
|
||
|
|
var uncurryThis = require('../internals/function-uncurry-this');
|
||
|
|
var uncurryThisAccessor = require('../internals/function-uncurry-this-accessor');
|
||
|
|
var toIndex = require('../internals/to-index');
|
||
|
|
var notDetached = require('../internals/array-buffer-not-detached');
|
||
|
|
var arrayBufferByteLength = require('../internals/array-buffer-byte-length');
|
||
|
|
var detachTransferable = require('../internals/detach-transferable');
|
||
|
|
var PROPER_STRUCTURED_CLONE_TRANSFER = require('../internals/structured-clone-proper-transfer');
|
||
|
|
|
||
|
|
var structuredClone = globalThis.structuredClone;
|
||
|
|
var ArrayBuffer = globalThis.ArrayBuffer;
|
||
|
|
var DataView = globalThis.DataView;
|
||
|
|
var min = Math.min;
|
||
|
|
var ArrayBufferPrototype = ArrayBuffer.prototype;
|
||
|
|
var DataViewPrototype = DataView.prototype;
|
||
|
|
var slice = uncurryThis(ArrayBufferPrototype.slice);
|
||
|
|
var isResizable = uncurryThisAccessor(ArrayBufferPrototype, 'resizable', 'get');
|
||
|
|
var maxByteLength = uncurryThisAccessor(ArrayBufferPrototype, 'maxByteLength', 'get');
|
||
|
|
var getInt8 = uncurryThis(DataViewPrototype.getInt8);
|
||
|
|
var setInt8 = uncurryThis(DataViewPrototype.setInt8);
|
||
|
|
|
||
|
|
module.exports = (PROPER_STRUCTURED_CLONE_TRANSFER || detachTransferable) && function (arrayBuffer, newLength, preserveResizability) {
|
||
|
|
var byteLength = arrayBufferByteLength(arrayBuffer);
|
||
|
|
var newByteLength = newLength === undefined ? byteLength : toIndex(newLength);
|
||
|
|
var fixedLength = !isResizable || !isResizable(arrayBuffer);
|
||
|
|
var newBuffer;
|
||
|
|
notDetached(arrayBuffer);
|
||
|
|
if (PROPER_STRUCTURED_CLONE_TRANSFER) {
|
||
|
|
arrayBuffer = structuredClone(arrayBuffer, { transfer: [arrayBuffer] });
|
||
|
|
if (byteLength === newByteLength && (preserveResizability || fixedLength)) return arrayBuffer;
|
||
|
|
}
|
||
|
|
if (byteLength >= newByteLength && (!preserveResizability || fixedLength)) {
|
||
|
|
newBuffer = slice(arrayBuffer, 0, newByteLength);
|
||
|
|
} else {
|
||
|
|
var options = preserveResizability && !fixedLength && maxByteLength ? { maxByteLength: maxByteLength(arrayBuffer) } : undefined;
|
||
|
|
newBuffer = new ArrayBuffer(newByteLength, options);
|
||
|
|
var a = new DataView(arrayBuffer);
|
||
|
|
var b = new DataView(newBuffer);
|
||
|
|
var copyLength = min(newByteLength, byteLength);
|
||
|
|
for (var i = 0; i < copyLength; i++) setInt8(b, i, getInt8(a, i));
|
||
|
|
}
|
||
|
|
if (!PROPER_STRUCTURED_CLONE_TRANSFER) detachTransferable(arrayBuffer);
|
||
|
|
return newBuffer;
|
||
|
|
};
|