gno.land/p/moul/x/daily/hexdump/v0

Classic xxd -C byte dump — Dump, DumpString, Line, Offset, Hex, ASCII, Printable, MaxBytes, BytesPerLine.

1import "gno.land/p/moul/x/daily/hexdump/v0"
2
3out, n := hexdump.DumpString("café")
4// 00000000  63 61 66 c3 a9                                    |caf..|
5// n == 5 — "é" is two bytes

The familiar layout: 8-digit hex offset, 16 bytes as hex in two 8-byte groups, then the ASCII view between pipes with non-printables as .. Short final lines are padded so the ASCII gutter never shifts — that alignment is the whole point of the format, and it has its own test asserting the gutter lands in the same column on a full and a partial line.

Useful on chain for the same reason it is useful off it: when a value is not what you expected, the bytes tell you why. Trailing whitespace, stray NULs, UTF-8 that is not what it claims — all invisible in a rendered string and obvious in a dump.

Dump returns the number of bytes rendered alongside the text, so truncation at MaxBytes (4096) is reported rather than silent.

Live demo: r/moul/x/daily/hexdumpdemo · render it at /r/moul/x/daily/hexdumpdemo/v0.

Part of moul/gno-contracts — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

🧪 Highly experimental — potentially vibe-coded. Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: DISCLAIMER.