I have base64 string encoded from a uint16Array . I want to convert it to an Array but the converted values are on 8 bits whereas i need them to be on 16 bits.
const b64 = Buffer.from(new Uint16Array([10, 100, 300])).toString('base64');
const arr = Array.from(atob(b64), c => c.charCodeAt(0)) // [10, 100, 44]
You are experiencing data loss.
Here a step by step of what is happening:
// in memory you have store 16bit per each char
const source = new Uint16Array([
10, /// 0000 0000 0000 1010
100, // 0000 0000 0110 0100
300, // 0000 0001 0010 1100
60000 // 1110 1010 0110 0000
])
// there is not information loss here, we use the raw buffer (array of bytes)
const b64 = Buffer.from(source.buffer).toString('base64')
// get the raw buffer
const buf = Buffer.from(b64, 'base64')
// create the Uint 16, reading 2 byte per char
const destination = new Uint16Array(buf.buffer, buf.byteOffset, buf.length / Uint16Array.BYTES_PER_ELEMENT)
console.log({
source,
b64,
backBuffer,
destination
})
// {
// source: Uint16Array [ 10, 100, 300, 60000 ],
// b64: 'CgBkACwBYOo=',
// destination: Uint16Array [ 10, 100, 300, 60000 ]
// }
atob dependency since seems to have problems with the conversionTry using Buffer.from(b64, 'base64').toString() to decode
const b64 = Buffer.from(new Uint16Array([10, 100, 300]).join(',')).toString('base64');
const arr = new Uint16Array(Buffer.from(b64, 'base64').toString().split(','))
