Refinement of upb_bytesrc interface.

Added a upb_byteregion that tracks a region of
the input buffer; decoders use this instead of
using a upb_bytesrc directly.  upb_byteregion
is also used as the way of passing a string to
a upb_handlers callback.  This symmetry makes
decoders compose better; if you want to take
a parsed string and decode it as something else,
you can take the string directly from the callback
and feed it as input to another parser.

A commented-out version of a pinning interface
is present; I decline to actually implement it
(and accept its extra complexity) until/unless
it is clear that it is actually a win.  But it
is included as a proof-of-concept, to show that
it fits well with the existing interface.

1 files changed, 1 insertions, 0 deletions

diff --git a/upb/table.h b/upb/table.h
index f410457..0786a1a 100644
--- a/upb/table.h
+++ b/upb/table.h
@@ -20,6 +20,7 @@
 #define UPB_TABLE_H_
 
 #include <assert.h>
+#include <stddef.h>
 #include "upb.h"
 
 #ifdef __cplusplus