109 lines
3.2 KiB
JavaScript
109 lines
3.2 KiB
JavaScript
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'use strict';
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var buffer = require('buffer');
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var Buffer = buffer.Buffer;
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var SlowBuffer = buffer.SlowBuffer;
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var MAX_LEN = buffer.kMaxLength || 2147483647;
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exports.alloc = function alloc(size, fill, encoding) {
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if (typeof Buffer.alloc === 'function') {
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return Buffer.alloc(size, fill, encoding);
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}
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if (typeof encoding === 'number') {
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throw new TypeError('encoding must not be number');
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}
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if (typeof size !== 'number') {
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throw new TypeError('size must be a number');
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}
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if (size > MAX_LEN) {
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throw new RangeError('size is too large');
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}
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var enc = encoding;
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var _fill = fill;
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if (_fill === undefined) {
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enc = undefined;
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_fill = 0;
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}
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var buf = new Buffer(size);
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if (typeof _fill === 'string') {
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var fillBuf = new Buffer(_fill, enc);
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var flen = fillBuf.length;
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var i = -1;
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while (++i < size) {
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buf[i] = fillBuf[i % flen];
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}
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} else {
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buf.fill(_fill);
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}
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return buf;
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}
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exports.allocUnsafe = function allocUnsafe(size) {
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if (typeof Buffer.allocUnsafe === 'function') {
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return Buffer.allocUnsafe(size);
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}
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if (typeof size !== 'number') {
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throw new TypeError('size must be a number');
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}
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if (size > MAX_LEN) {
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throw new RangeError('size is too large');
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}
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return new Buffer(size);
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}
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exports.from = function from(value, encodingOrOffset, length) {
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if (typeof Buffer.from === 'function' && (!global.Uint8Array || Uint8Array.from !== Buffer.from)) {
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return Buffer.from(value, encodingOrOffset, length);
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}
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if (typeof value === 'number') {
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throw new TypeError('"value" argument must not be a number');
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}
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if (typeof value === 'string') {
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return new Buffer(value, encodingOrOffset);
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}
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if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
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var offset = encodingOrOffset;
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if (arguments.length === 1) {
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return new Buffer(value);
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}
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if (typeof offset === 'undefined') {
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offset = 0;
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}
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var len = length;
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if (typeof len === 'undefined') {
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len = value.byteLength - offset;
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}
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if (offset >= value.byteLength) {
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throw new RangeError('\'offset\' is out of bounds');
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}
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if (len > value.byteLength - offset) {
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throw new RangeError('\'length\' is out of bounds');
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}
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return new Buffer(value.slice(offset, offset + len));
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}
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if (Buffer.isBuffer(value)) {
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var out = new Buffer(value.length);
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value.copy(out, 0, 0, value.length);
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return out;
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}
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if (value) {
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if (Array.isArray(value) || (typeof ArrayBuffer !== 'undefined' && value.buffer instanceof ArrayBuffer) || 'length' in value) {
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return new Buffer(value);
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}
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if (value.type === 'Buffer' && Array.isArray(value.data)) {
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return new Buffer(value.data);
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}
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}
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throw new TypeError('First argument must be a string, Buffer, ' + 'ArrayBuffer, Array, or array-like object.');
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}
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exports.allocUnsafeSlow = function allocUnsafeSlow(size) {
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if (typeof Buffer.allocUnsafeSlow === 'function') {
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return Buffer.allocUnsafeSlow(size);
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}
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if (typeof size !== 'number') {
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throw new TypeError('size must be a number');
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}
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if (size >= MAX_LEN) {
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throw new RangeError('size is too large');
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}
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return new SlowBuffer(size);
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}
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