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92 lines
2.7 KiB
92 lines
2.7 KiB
'use strict';
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const smalloc = process.binding('smalloc');
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const Buffer = require('buffer').Buffer;
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const kMaxLength = smalloc.kMaxLength;
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const kMinType = smalloc.kMinType;
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const kMaxType = smalloc.kMaxType;
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const util = require('util');
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exports.alloc = alloc;
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exports.copyOnto = copyOnto;
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exports.dispose = dispose;
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exports.hasExternalData = 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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Object.defineProperty(exports, 'Types', {
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enumerable: true, value: Object.freeze(smalloc.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 (obj === undefined)
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obj = {};
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if (typeof obj === 'number') {
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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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if (Array.isArray(obj))
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throw new TypeError('obj cannot be an array');
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if (obj instanceof Buffer)
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throw new TypeError('obj cannot be a Buffer');
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if (smalloc.isTypedArray(obj))
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throw new TypeError('obj cannot be a typed array');
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if (smalloc.hasExternalData(obj))
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throw new TypeError('object already has external array data');
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if (type < kMinType || type > kMaxType)
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throw new TypeError('unknown external array type: ' + type);
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if (n > kMaxLength)
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throw new RangeError('Attempt to allocate array larger than maximum ' +
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'size: 0x' + kMaxLength.toString(16) + ' elements');
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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 (obj instanceof Buffer)
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throw new TypeError('obj cannot be a Buffer');
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if (smalloc.isTypedArray(obj))
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throw new TypeError('obj cannot be a typed array');
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if (!smalloc.hasExternalData(obj))
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throw new TypeError('obj has no external array data');
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smalloc.dispose(obj);
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}
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function copyOnto(source, sourceStart, dest, destStart, copyLength) {
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if (util.isPrimitive(source))
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throw new TypeError('source must be an Object');
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if (util.isPrimitive(dest))
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throw new TypeError('dest must be an Object');
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if (!smalloc.hasExternalData(source))
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throw new TypeError('source has no external array data');
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if (!smalloc.hasExternalData(dest))
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throw new TypeError('dest has no external array data');
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return smalloc.copyOnto(source, sourceStart, dest, destStart, copyLength);
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}
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function hasExternalData(obj) {
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if (util.isPrimitive(obj))
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return false;
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return smalloc.hasExternalData(obj);
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}
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