70 lines
1.6 KiB
JavaScript
70 lines
1.6 KiB
JavaScript
/* eslint-disable node/no-deprecated-api */
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var toString = Object.prototype.toString;
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var isModern =
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typeof Buffer !== 'undefined' &&
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typeof Buffer.alloc === 'function' &&
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typeof Buffer.allocUnsafe === 'function' &&
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typeof Buffer.from === 'function';
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function isArrayBuffer(input) {
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return toString.call(input).slice(8, -1) === 'ArrayBuffer';
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}
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function fromArrayBuffer(obj, byteOffset, length) {
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byteOffset >>>= 0;
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var maxLength = obj.byteLength - byteOffset;
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if (maxLength < 0) {
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throw new RangeError("'offset' is out of bounds");
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}
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if (length === undefined) {
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length = maxLength;
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} else {
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length >>>= 0;
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if (length > maxLength) {
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throw new RangeError("'length' is out of bounds");
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}
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}
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return isModern ?
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Buffer.from(obj.slice(byteOffset, byteOffset + length))
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: new Buffer(new Uint8Array(obj.slice(byteOffset, byteOffset + length)));
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}
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function fromString(string, encoding) {
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if (typeof encoding !== 'string' || encoding === '') {
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encoding = 'utf8';
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}
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if (!Buffer.isEncoding(encoding)) {
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throw new TypeError('"encoding" must be a valid string encoding');
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}
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return isModern ?
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Buffer.from(string, encoding)
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: new Buffer(string, encoding);
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}
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function bufferFrom(value, encodingOrOffset, length) {
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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 (isArrayBuffer(value)) {
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return fromArrayBuffer(value, encodingOrOffset, length);
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}
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if (typeof value === 'string') {
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return fromString(value, encodingOrOffset);
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}
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return isModern ? Buffer.from(value) : new Buffer(value);
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}
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module.exports = bufferFrom;
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