Extend inline / fixed length bytes array support (issue #244)

Adds support for proto3 and POINTER field types to have
fixed length bytes arrays. Also changed the .proto option
to a separate fixed_length:true, while also supporting the old FT_INLINE
option.

Restructured the generator and decoder logic to threat the inline
bytes fields more like "just another field type".

1 files changed, 4 insertions, 1 deletions

diff --git a/generator/proto/nanopb.proto b/generator/proto/nanopb.proto
index 7d39e1c3..e4c1da79 100644
--- a/generator/proto/nanopb.proto
+++ b/generator/proto/nanopb.proto
@@ -16,7 +16,7 @@ enum FieldType {
     FT_POINTER = 4; // Always generate a dynamically allocated field.
     FT_STATIC = 2; // Generate a static field or raise an exception if not possible.
     FT_IGNORE = 3; // Ignore the field completely.
-    FT_INLINE = 5; // Always generate an inline array of fixed size.
+    FT_INLINE = 5; // Legacy option, use the separate 'fixed_length' option instead
 }
 
 enum IntSize {
@@ -77,6 +77,9 @@ message NanoPBOptions {
 
   // Generate an enum->string mapping function (can take up lots of space).
   optional bool enum_to_string = 13 [default = false];
+
+  // Generate bytes arrays with fixed length
+  optional bool fixed_length = 15 [default = false];
 }
 
 // Extensions to protoc 'Descriptor' type in order to define options