Andrew Stitcher created PROTON-2966:
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             Summary: pn_decoder_decode does not report why a decode failed
                 Key: PROTON-2966
                 URL: https://issues.apache.org/jira/browse/PROTON-2966
             Project: Qpid Proton
          Issue Type: Improvement
          Components: proton-c
            Reporter: Andrew Stitcher
            Assignee: Andrew Stitcher
             Fix For: proton-c-0.41.0


pn_decoder_decode() returned a bare error code for most failures.

Change that so that we make each failure carry a message with more information 
about the failure: naming the typecode or the field at fault, or the compound 
whose declared size is too small to hold its own header.

The decoder kept its own pn_error_t, but nothing ever reads it, sod rop the 
decoder's private error object and report failures on the pn_data_t being 
decoded into, where pn_data_error() already lets the caller retrieve them.

This is a diagnostics change only: the error codes returned are unchanged.



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