Commit 1c11e3c9 authored by Sven Gestegård Robertz's avatar Sven Gestegård Robertz
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more on type_defs

parent f60d2c16
......@@ -330,11 +330,7 @@ i.e.,
<sample_data> <user_id: 40> <length: 14> <packed_sample_data>
\section{Technical details}
TODO: better section title
\subsection{Type and sample declarations}
\section{Type and sample declarations}
LabComm has two constructs for declaring sample types, \emph{sample
declarations} and \emph{type declarations}. A sample declaration is used
......@@ -386,7 +382,7 @@ come from two independent number series. To identify which
\verb+TYPE_DECL+ a particular \verb+SAMPLE_DECL+ corresponds to, the
\verb+TYPE_BINDING+ packet is used.
The labcomm declaration
......@@ -418,6 +414,22 @@ Note that the id 0x40 is used both for the \verb+TYPE_DECL+ of
\verb+TYPE_BINDING+ binds the sample id \verb+0x40+ to the type id
\subsection{Run-time behaviour}
When a sample type is registered on an encoder, a \verb+SAMPLE_DECL+
(i.e., the flat signature) is always generated on that encoder channel.
If the sample depends on user types (i.e., typedefs), \verb+TYPE_DECL+
packets are encoded, recursively, for the dependent types and a
corresponding \verb+TYPE_BINDING+ is encoded.
If a \verb+TYPE_DECL+ is included via multiple sample types, or
dependency paths, an encoder may choose to only encode it once, but is
not required to do so. However, if multiple \verb+TYPE_DECL+ packets are
sent for the same \verb+typedef+, the encoder must use the same
......@@ -515,8 +527,8 @@ The built-in data types are encoded as follows:
<type_binding> |
<sample_data> )
<version> := <string>
<sample_def> := <sample_id> <string> <type>
<type_def> := <type_id> <string> <type>
<sample_decl> := <sample_id> <string> <type>
<type_decl> := <type_id> <string> <type>
<type_binding> := <sample_id> <type_id>
<user_id> := 0x40..0xffffffff
<sample_id> : <user_id>
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