jackandClaude Fable 5 3f6dc7dd36 Speed up hex encode/decode with lookup tables ...

Data.hexEncodedString() built each byte via String(format: "%02x", _),
paying Foundation format-string parsing per byte on the hot BLE receive
path (PeerID(hexData:) is called several times per received packet).
Replace it with an ASCII lookup table writing into a preallocated
buffer; output is byte-for-byte identical (lowercase hex).

Data(hexString:) similarly allocated a two-character substring and went
through integer radix parsing per byte; replace with direct nibble
lookups over the UTF-8 bytes. Semantics are unchanged except that
sign-prefixed pairs like "+f", which the old radix parser incorrectly
accepted, are now rejected.

Add round-trip, known-vector, and invalid-input tests to
BitFoundationTests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-01 23:26:38 +02:00

..

Sources/BitFoundation

Speed up hex encode/decode with lookup tables

2026-07-01 23:26:38 +02:00

Tests/BitFoundationTests

Speed up hex encode/decode with lookup tables

2026-07-01 23:26:38 +02:00

Package.swift

Move additional files/tests to BitFoundation (#1102)

2026-04-15 12:26:48 -05:00