Nanopb

Fix buffer overflow when encoding bytes with size set to 65535 (547, GHSA-3p39-mfxg-hrq4)
Fix proto3 submessage improperly considered empty (504)
Fix ImportError when using generator/protoc with Python 3
Add build rules for Swift package manager (549)

Fix invalid free() after failed realloc() (GHSA-gcx3-7m76-287p)
Add workaround for avr-libc realloc() bug (475)
Fix empty submessages getting encoded in proto3 mode (395)
Avoid overflows in allocation for packed fields.

Fix undefined behavior with bool fields (434)
Fix enum min/max defines when values are not in order (405)
Fix network_server socket example with zero-length strings (421)
Don't call stream read callback with count=0 (421)
Add compile time flag PB_ENCODE_ARRAYS_UNPACKED (427)

NOTE: nanopb-0.3.9.3.tar.gz before 2019-03-21 was accidentally from 0.4 branch (388)
Fix fixed size and callback repeated fields inside proto3 submessages (376, 382, 386)
Fix incorrect PB_STATIC_ASSERT for bytes inside oneof (363)
Fix generator error with mangle_names option (380)
Generator: Allow comma separated options in plugin mode (343)

Erroneous free() when using callbacks combined with PB_ENABLE_MALLOC (346)
Fix possible null-pointer dereference in decode_callback_field (342)
Fix FindNanopb.cmake on Windows (335)
Fix large generator memory usage with oneof fields (338)
Fix error in splint test (359)
Allow cmake to build as a shared library (352, 353)
Add --no-strip-path command line option (326)
Option for flattening nested protobuf names (333)
Documentation fixes (329, 350, 358)
Better error messages (351)

Fix handling of special characters in string/bytes default values (issue 322)
Fix encoding of negative numbers with PB_WITHOUT_64BIT (285)
Fix _zero initializer for enums that don't begin at 0. (295)
Multiple CMake fixes (296, 299, 304, 312, 320)
Fix compiler warnings (305)
Fix scons rules for Python 3
Add check for large extension field number (issue 306)
Updated included descriptor.proto version (314)
Resolve oneof sizes symbolically when needed (311)
Add fixed_count option (260)
Add some verbose prints in generator (issue 238)
Add test/example of using 'map' type. (289)