"how img to base64 work" Code Answer's
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how img to base64 work
/**
* @param {Uint8Array} bytes
* @return {string} Base64 encoded string
*/
function base64Encode(bytes) {
let encoding = '';
for (let group of groups24Bits(bytes)) {
for (let value of values6Bits(group)) {
if (value !== undefined) {
encoding += ALPHABET[value];
} else {
encoding += PAD;
}
}
}
return encoding;
}
const ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
const PAD = '=';
/**
* @param {Uint8Array} bytes
* @return {Uint8Array} The next input group (yielded on each execution)
*/
function* groups24Bits(bytes) {
for (let i = 0; i < bytes.length; i += 3) {
yield bytes.slice(i, i + 3); // 3 bytes/3 octets/24 bits
}
}
/**
* @param {Uint8Array} group Expected to be array of 1 to 3 bytes
* @return {number|undefined} The next 6-bit value from the
* input group (yielded on each execution)
*/
function* values6Bits(group) {
const paddedGroup = Uint8Array.from([0, 0, 0]);
paddedGroup.set(group);
let numValues = Math.ceil((group.length * 8) / 6);
for (let i = 0; i < numValues; i++) { let base64Value; if (i == 0) { base64Value = (paddedGroup[0] & 0b11111100) >> 2;
} else if (i == 1) {
base64Value = (paddedGroup[0] & 0b00000011) << 4; base64Value = base64Value | ((paddedGroup[1] & 0b11110000) >> 4);
} else if (i == 2) {
base64Value = (paddedGroup[1] & 0b00001111) << 2; base64Value = base64Value | ((paddedGroup[2] & 0b11000000) >> 6);
} else if (i == 3) {
base64Value = paddedGroup[2] & 0b00111111;
}
yield base64Value;
}
let numPaddingValues = 4 - numValues;
for (let j = 0; j < numPaddingValues; j++) {
yield undefined;
}
}
Source: www.lucidchart.com
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