ghostty

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Mitchell Hashimoto bc2f7d7d2f terminal: update Kitty clipboard base64 handling to spec

The Kitty clipboard protocol now specifies base64 handling:
All OSC 5522 payloads and the base64 metadata values (mime, name, pw)
use strict RFC 4648 with the standard alphabet. Characters outside
the alphabet (including whitespace) and incorrect padding must be
rejected, never silently skipped. 

For wdata payloads for one MIME type, the base64 stream can be split
at arbitrary packet boundaries and only the concatenation must be
correctly padded.

Simdutf has a strict mode for base64 so we got this for free.
Benchmarks to be safe:

| Decoder                       | Time  | Throughput |
|-------------------------------|-------|------------|
| permissive (previous)         | 99ms  | 10.8 GB/s  |
| strict                        | 97ms  | 11.1 GB/s  |
| strict, streaming 4KiB chunks | 102ms | 10.5 GB/s  |
| strict w/ separate scan pass  | 143ms | 7.5 GB/s   |
| std.base64 scalar             | 234ms | 4.6 GB/s   |

Spec changes upstream:
479872838f
https://sw.kovidgoyal.net/kitty/clipboard/#encoding-of-payloads

2026-08-25 08:08:16 -07:00

base64_scalar.zig

terminal: update Kitty clipboard base64 handling to spec

2026-08-25 08:08:16 -07:00

base64.cpp

simd: add base64 functions from simdutf

2024-07-16 20:12:45 -07:00

base64.zig

terminal: update Kitty clipboard base64 handling to spec

2026-08-25 08:08:16 -07:00

codepoint_width.cpp

pkg/highway: vendor and modify to remain all libc usage