mirror of https://github.com/lukechilds/node.git
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.
76 lines
2.3 KiB
76 lines
2.3 KiB
'use strict';
|
|
|
|
var smalloc = process.binding('smalloc');
|
|
var kMaxLength = smalloc.kMaxLength;
|
|
var util = require('util');
|
|
|
|
exports.alloc = alloc;
|
|
exports.copyOnto = smalloc.copyOnto;
|
|
exports.dispose = dispose;
|
|
exports.hasExternalData = smalloc.hasExternalData;
|
|
|
|
// don't allow kMaxLength to accidentally be overwritten. it's a lot less
|
|
// apparent when a primitive is accidentally changed.
|
|
Object.defineProperty(exports, 'kMaxLength', {
|
|
enumerable: true, value: kMaxLength, writable: false
|
|
});
|
|
|
|
// enumerated values for different external array types
|
|
var Types = {};
|
|
|
|
// Must match enum v8::ExternalArrayType.
|
|
Object.defineProperties(Types, {
|
|
'Int8': { enumerable: true, value: 1, writable: false },
|
|
'Uint8': { enumerable: true, value: 2, writable: false },
|
|
'Int16': { enumerable: true, value: 3, writable: false },
|
|
'Uint16': { enumerable: true, value: 4, writable: false },
|
|
'Int32': { enumerable: true, value: 5, writable: false },
|
|
'Uint32': { enumerable: true, value: 6, writable: false },
|
|
'Float': { enumerable: true, value: 7, writable: false },
|
|
'Double': { enumerable: true, value: 8, writable: false },
|
|
'Uint8Clamped': { enumerable: true, value: 9, writable: false }
|
|
});
|
|
|
|
Object.defineProperty(exports, 'Types', {
|
|
enumerable: true, value: Types, writable: false
|
|
});
|
|
|
|
|
|
// usage: obj = alloc(n[, obj][, type]);
|
|
function alloc(n, obj, type) {
|
|
n = n >>> 0;
|
|
|
|
if (util.isUndefined(obj))
|
|
obj = {};
|
|
|
|
if (util.isNumber(obj)) {
|
|
type = obj >>> 0;
|
|
obj = {};
|
|
} else if (util.isPrimitive(obj)) {
|
|
throw new TypeError('obj must be an Object');
|
|
}
|
|
|
|
// 1 == v8::kExternalUint8Array, 9 == v8::kExternalUint8ClampedArray
|
|
if (type < 1 || type > 9)
|
|
throw new TypeError('unknown external array type: ' + type);
|
|
if (util.isArray(obj))
|
|
throw new TypeError('Arrays are not supported');
|
|
if (n > kMaxLength)
|
|
throw new RangeError('n > kMaxLength');
|
|
|
|
return smalloc.alloc(obj, n, type);
|
|
}
|
|
|
|
|
|
function dispose(obj) {
|
|
if (util.isPrimitive(obj))
|
|
throw new TypeError('obj must be an Object');
|
|
if (util.isBuffer(obj))
|
|
throw new TypeError('obj cannot be a Buffer');
|
|
if (smalloc.isTypedArray(obj))
|
|
throw new TypeError('obj cannot be a typed array');
|
|
if (!smalloc.hasExternalData(obj))
|
|
throw new Error('obj has no external array data');
|
|
|
|
smalloc.dispose(obj);
|
|
}
|
|
|