ASCII85 encoder does not output a leading '<~'

claird / PyPDF4

A utility to read and write PDFs with Python

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ASCII85 encoder does not output a leading '<~' #47

Closed kurtmckee closed 5 years ago

kurtmckee commented 5 years ago

The Adobe implementation of ASCII85 requires a leading b'<~' on encoded output. It appears the current encoder does not match the spec.

This is important because once Python 2 support is dropped the implementation can simply call base64.a85encode(data, adobe=True), so matching this behavior now will help prepare PyPDF4 to drop Python 2 support.