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cec81593d7
smalloc.alloc now accepts an optional third argument which allows specifying the type of array that should be allocated. All available types are now located on smalloc.Types.
90 lines
3.1 KiB
JavaScript
90 lines
3.1 KiB
JavaScript
// 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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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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// 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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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::kExternalByteArray, 9 == v8::kExternalPixelArray
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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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smalloc.dispose(obj);
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}
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