morph-da-codec

Morph DA zstd codec (encoder + decoder) shared by Rust zkVM guest code and Go node code.

The encoder and decoder are compiled into a single staticlib and exposed to Go through the bindings/codec/zstd package:

• CompressMorphDABatch — compress a batch into a magic-less zstd frame;
• DecompressMorphDABatch — decompress a frame produced by the encoder.

Semantics

Encoder and decoder share the same frame format:

• the frame omits the zstd magic bytes (28 b5 2f fd); the decoder prepends them internally;
• a single frame is produced, with content size included so the decoder can validate it;
• literal compression is disabled (raw literal bytes) and the window log is capped at 17.

Decoder specifics:

• only the first complete frame is decoded; bytes after it are ignored;
• first frame content size is required and validated.

Build

make build-zstd-ffi
make install-codec-bindings
make test