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Viewing file:     index.js (1.21 KB)      -rw-r--r--

"use strict";
module.exports = pool;

/**
 * An allocator as used by {@link util.pool}.
 * @typedef PoolAllocator
 * @type {function}
 * @param {number} size Buffer size
 * @returns {Uint8Array} Buffer
 */

/**
 * A slicer as used by {@link util.pool}.
 * @typedef PoolSlicer
 * @type {function}
 * @param {number} start Start offset
 * @param {number} end End offset
 * @returns {Uint8Array} Buffer slice
 * @this {Uint8Array}
 */

/**
 * A general purpose buffer pool.
 * @memberof util
 * @function
 * @param {PoolAllocator} alloc Allocator
 * @param {PoolSlicer} slice Slicer
 * @param {number} [size=8192] Slab size
 * @returns {PoolAllocator} Pooled allocator
 */
function pool(alloc, slice, size) {
    var SIZE   = size || 8192;
    var MAX    = SIZE >>> 1;
    var slab   = null;
    var offset = SIZE;
    return function pool_alloc(size) {
        if (size < 1 || size > MAX)
            return alloc(size);
        if (offset + size > SIZE) {
            slab = alloc(SIZE);
            offset = 0;
        }
        var buf = slice.call(slab, offset, offset += size);
        if (offset & 7) // align to 32 bit
            offset = (offset | 7) + 1;
        return buf;
    };
}