Simple C++ schema-driven serialization

• Header-only library suitable for android/arm builds
• Small, easy to understand
• No pre-compilation of headers
• No template specialization complexity

Format overview

• Field/value: similar to protobuf
• 2-bit wire format selector (varint, varbyte, 32-bit, 64-bit)
• varint field id (1st 32 fields addressable in 1 byte)
• varint + length for str/binary
• zigzag encoding for signed

Interface

• Construct instance of Schema class
• call encode() to get encoder
  • call set(enum, value) to set fields
  • call out() to get output
• call decode(bytes) to get decoder
  • call get_xxx(enum) to get fields
  • call arr_get_xxx(enum, index) to get repeated fields
  • call arr_len(enum) to get repeated field length

Checks

• Fields must be sequential and not repeat, unless marked repeated
• Arrays/repeated fields must be sequential
• Unknown (forward compat) fields must be > schema max field
• Wire type fixed via field type and length

Speed

• Zero-copy string/buffer access for byte decoding
• ~2% slower than google protobuf

TODO:

• stream i/o for encode/decode