Converts between binary and base64.
Used on Android in verification of purchases if a public key is set.
The sources can be found in qt5/qtpurchasing/src/android/src/org/qtproject/qt5/android/purchasing/Base64.java and qt5/qtpurchasing/src/android/src/org/qtproject/qt5/android/purchasing/Base64DecoderException.java.
Copyright 2002, Google, Inc.
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