Ensures that the cursor's value marker is fully reset between values. #787
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Description of changes:
Fuzzing identified a case where this mattered. This is now captured in the added unit test. In summary, if the previous value was a struct, and the current value begins with an incomplete annotation wrapper, the reader would attempt to read additional bytes from the input to determine if the value was a symbol table. This could result in
ArrayIndexOutOfBoundsException, as in this case, if those bytes are not available. Clearing the typeId between values ensures that the reader will never enter the symbol table determination logic when positioned on an incomplete annotation wrapper, allowing that logic to remain unchanged. After this fix, anIonExceptionfor unexpected EOF is thrown in this case.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.