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95 lines
3.3 KiB
95 lines
3.3 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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'use strict';
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var smalloc = process.binding('smalloc');
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var kMaxLength = smalloc.kMaxLength;
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var util = require('util');
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exports.alloc = alloc;
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exports.copyOnto = smalloc.copyOnto;
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exports.dispose = dispose;
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exports.hasExternalData = smalloc.hasExternalData;
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// don't allow kMaxLength to accidentally be overwritten. it's a lot less
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// apparent when a primitive is accidentally changed.
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Object.defineProperty(exports, 'kMaxLength', {
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enumerable: true, value: kMaxLength, writable: false
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});
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// enumerated values for different external array types
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var Types = {};
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// Must match enum v8::ExternalArrayType.
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Object.defineProperties(Types, {
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'Int8': { enumerable: true, value: 1, writable: false },
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'Uint8': { enumerable: true, value: 2, writable: false },
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'Int16': { enumerable: true, value: 3, writable: false },
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'Uint16': { enumerable: true, value: 4, writable: false },
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'Int32': { enumerable: true, value: 5, writable: false },
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'Uint32': { enumerable: true, value: 6, writable: false },
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'Float': { enumerable: true, value: 7, writable: false },
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'Double': { enumerable: true, value: 8, writable: false },
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'Uint8Clamped': { enumerable: true, value: 9, writable: false }
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});
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Object.defineProperty(exports, 'Types', {
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enumerable: true, value: Types, writable: false
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});
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// usage: obj = alloc(n[, obj][, type]);
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function alloc(n, obj, type) {
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n = n >>> 0;
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if (util.isUndefined(obj))
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obj = {};
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if (util.isNumber(obj)) {
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type = obj >>> 0;
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obj = {};
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} else if (util.isPrimitive(obj)) {
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throw new TypeError('obj must be an Object');
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}
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// 1 == v8::kExternalUint8Array, 9 == v8::kExternalUint8ClampedArray
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if (type < 1 || type > 9)
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throw new TypeError('unknown external array type: ' + type);
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if (util.isArray(obj))
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throw new TypeError('Arrays are not supported');
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if (n > kMaxLength)
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throw new RangeError('n > kMaxLength');
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return smalloc.alloc(obj, n, type);
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}
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function dispose(obj) {
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if (util.isPrimitive(obj))
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throw new TypeError('obj must be an Object');
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if (util.isBuffer(obj))
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throw new TypeError('obj cannot be a Buffer');
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if (!smalloc.hasExternalData(obj))
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throw new Error('obj has no external array data');
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smalloc.dispose(obj);
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}
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