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1. the start and end callbacks can now return
a upb_flow_t and set a status message.
2. clarified some semantics around passing an
error status back from the callbacks.
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Sources and sinks communicate by means of a
upb_handlers object, which encapsulates a set of
handler callbacks and will possibly offer richer
semantics in the future like giving specific
fields different callbacks.
The upb_handlers protocol supports delegation, so
sets of handlers can be written in reusable ways.
For example, if a set of handlers is written to
handle a specific .proto type, those handlers can
be used whether that type is at the top level or
whether it is a sub-message of a higher-level type.
Delegation allows the streaming protocol to
properly compose.
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Unfortunately my previous detailed commit message was
lost somehow by git or vi. Will have to explain in more
detail at a later date the rationale for this change.
The build will be broken until I port the old decoder
to this new interface.
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test_decoder now compiles and links! But it doesn't
work yet.
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