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function base64ToBuffer (b64) {
// The base64 encoding uses the following set of characters to encode any binary data as text
const base64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
// Find the index of char '=' first occurrence
const paddingIdx = b64.
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