der: (re-)add Reader::read_value with EOC support
#1895
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This reverts commit 5277fcf.
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One of the blockers for addressing indefinite length handling (#779) has been where to consume the EOC tag. This commit (re)introduces `Reader::read_value` (added in #1877, removed in #1887) and handles decoding the EOC there. This gives us a single place where EOC can be handled for all constructed messages. With these changes, the decoder is able to parse `cms_ber.bin` from `cms/tests`, from which the `cms_der.bin` file has been translated. This file provides a real-world example of nested indefinite lengths from CMS. Note, however, that the example contains a constructed `Any` which isn't yet being correctly handled. A `TODO` for ensuring the BER and DER decode identically has been added.
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Note: because read_nested is not needed for primitive types, I suggest to introduce As stated in comment #1877 Therefore call chain would be: |
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@dishmaker I would love to find somewhere better to put this logic, but it ends up being quite difficult given the current usage |
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One of the blockers for addressing indefinite length handling (#779) has been where to consume the EOC tag.
This commit (re)introduces
Reader::read_value(added in #1877, removed in #1887) and handles decoding the EOC there. This gives us a single place where EOC can be handled for all constructed messages.With these changes, the decoder is able to parse
cms_ber.binfromcms/tests, from which thecms_der.binfile has been translated. This file provides a real-world example of nested indefinite lengths from CMS.Note, however, that the example contains a constructed
Anywhich isn't yet being correctly handled. ATODOfor ensuring the BER and DER decode identically has been added.cc @dishmaker