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'use strict';
var GetIntrinsic = require('get-intrinsic');
var min = require('math-intrinsics/min');
var $TypeError = require('es-errors/type');
var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%', true);
var $Uint8Array = GetIntrinsic('%Uint8Array%', true);
var callBound = require('call-bound');
var byteLength = require('array-buffer-byte-length');
var $maxByteLength = callBound('%ArrayBuffer.prototype.maxByteLength%', true);
var copy = function copyAB(src, start, end) {
var that = new $Uint8Array(src);
if (typeof end === 'undefined') {
end = that.length; // eslint-disable-line no-param-reassign
}
var result = new $ArrayBuffer(end - start);
var resultArray = new $Uint8Array(result);
for (var i = 0; i < resultArray.length; i++) {
resultArray[i] = that[i + start];
}
return result;
};
var $abSlice = callBound('%ArrayBuffer.prototype.slice%', true)
|| function slice(ab, a, b) { // in node < 0.11, slice is an own nonconfigurable property
return ab.slice ? ab.slice(a, b) : copy(ab, a, b); // node 0.8 lacks `slice`
};
var DetachArrayBuffer = require('./DetachArrayBuffer');
var IsDetachedBuffer = require('./IsDetachedBuffer');
var IsFixedLengthArrayBuffer = require('./IsFixedLengthArrayBuffer');
var ToIndex = require('./ToIndex');
var isArrayBuffer = require('is-array-buffer');
var isSharedArrayBuffer = require('is-shared-array-buffer');
// https://262.ecma-international.org/15.0/#sec-arraybuffercopyanddetach
module.exports = function ArrayBufferCopyAndDetach(arrayBuffer, newLength, preserveResizability) {
if (preserveResizability !== 'PRESERVE-RESIZABILITY' && preserveResizability !== 'FIXED-LENGTH') {
throw new $TypeError('`preserveResizability` must be ~PRESERVE-RESIZABILITY~ or ~FIXED-LENGTH~');
}
if (!isArrayBuffer(arrayBuffer) || isSharedArrayBuffer(arrayBuffer)) {
throw new $TypeError('`arrayBuffer` must be a non-shared ArrayBuffer'); // steps 1 - 2
}
var abByteLength;
var newByteLength;
if (typeof newLength === 'undefined') { // step 3
newByteLength = byteLength(arrayBuffer); // step 3.a
abByteLength = newByteLength;
} else { // step 4
newByteLength = ToIndex(newLength); // step 4.a
}
if (IsDetachedBuffer(arrayBuffer)) {
throw new $TypeError('`arrayBuffer` must not be detached'); // step 5
}
var newMaxByteLength;
if (preserveResizability === 'PRESERVE-RESIZABILITY' && !IsFixedLengthArrayBuffer(arrayBuffer)) { // step 6
newMaxByteLength = $maxByteLength(arrayBuffer); // step 6.a
} else { // step 7
newMaxByteLength = 'EMPTY'; // step 7.a
}
// commented out since there's no way to set or access this key
// 8. If arrayBuffer.[[ArrayBufferDetachKey]] is not undefined, throw a TypeError exception.
// 9. Let newBuffer be ? AllocateArrayBuffer(%ArrayBuffer%, newByteLength, newMaxByteLength).
var newBuffer = newMaxByteLength === 'EMPTY' ? new $ArrayBuffer(newByteLength) : new $ArrayBuffer(newByteLength, { maxByteLength: newMaxByteLength });
if (typeof abByteLength !== 'number') {
abByteLength = byteLength(arrayBuffer);
}
var copyLength = min(newByteLength, abByteLength); // step 10
if (newByteLength > copyLength || newMaxByteLength !== 'EMPTY') {
var taNew = new $Uint8Array(newBuffer);
var taOld = new $Uint8Array(arrayBuffer);
for (var i = 0; i < copyLength; i++) {
taNew[i] = taOld[i];
}
} else {
newBuffer = $abSlice(arrayBuffer, 0, copyLength); // ? optimization for when the new buffer will not be larger than the old one
}
/*
11. Let fromBlock be arrayBuffer.[[ArrayBufferData]].
12. Let toBlock be newBuffer.[[ArrayBufferData]].
13. Perform CopyDataBlockBytes(toBlock, 0, fromBlock, 0, copyLength).
14. NOTE: Neither creation of the new Data Block nor copying from the old Data Block are observable. Implementations may implement this method as a zero-copy move or a realloc.
*/
DetachArrayBuffer(arrayBuffer); // step 15
return newBuffer; // step 16
};