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/* globals atob, btoa, crypto */
/* istanbul ignore file */
'use strict'
const bytes = require('./core')
bytes.from = (_from, _encoding) => {
if (_from instanceof DataView) return _from
if (_from instanceof ArrayBuffer) return new DataView(_from)
let buffer
if (typeof _from === 'string') {
if (!_encoding) {
_encoding = 'utf-8'
} else if (_encoding === 'base64') {
buffer = Uint8Array.from(atob(_from), c => c.charCodeAt(0)).buffer
return new DataView(buffer)
}
if (_encoding !== 'utf-8') throw new Error('Browser support for encodings other than utf-8 not implemented')
return new DataView((new TextEncoder()).encode(_from).buffer)
} else if (typeof _from === 'object') {
if (ArrayBuffer.isView(_from)) {
if (_from.byteLength === _from.buffer.byteLength) return new DataView(_from.buffer)
else return new DataView(_from.buffer, _from.byteOffset, _from.byteLength)
}
}
throw new Error('Unkown type. Cannot convert to ArrayBuffer')
}
bytes.toString = (_from, encoding) => {
_from = bytes(_from, encoding)
const uint = new Uint8Array(_from.buffer, _from.byteOffset, _from.byteLength)
const str = String.fromCharCode(...uint)
if (encoding === 'base64') {
/* would be nice to find a way to do this directly from a buffer
* instead of doing two string conversions
*/
return btoa(str)
} else {
return str
}
}
bytes.native = (_from, encoding) => {
if (_from instanceof Uint8Array) return _from
_from = bytes.from(_from, encoding)
return new Uint8Array(_from.buffer, _from.byteOffset, _from.byteLength)
}
if (process.browser) bytes._randomFill = (...args) => crypto.getRandomValues(...args)
module.exports = bytes
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