Tanish MankuandClaude ce9a1d1014 F2: read glyph names by the naming algorithm, and stop reading Symbol as Latin ...

Two gaps in code-to-Unicode, both found by probing the current
behaviour rather than by reading the code.

A font with no /Widths and no /ToUnicode fell back to StandardEncoding
whatever it was, so /Symbol code 0x61 -- `alpha` in Symbol's own
built-in encoding -- decoded as "a". ZapfDingbats and MacExpert were
read as Latin the same way. That map is what `redact` matches patterns
against, so a wrong character there is a silent redaction failure, and
a wrong character is worse than no character. Symbol, ZapfDingbats and
MacExpert now yield no mapping at all unless the font names a base
encoding, which is always honoured as the deliberate statement it is.

This keys on the base font *name*, not the /FontDescriptor symbolic
flag. A great many ordinary Latin TrueType subsets set that flag and
still rely on a Latin encoding, so suppressing on the flag would lose
real text across a large share of real documents. A test pins that
restraint so it is not "fixed" into a regression later.

Glyph names now follow the published naming algorithm instead of two
of its cases: a name is cut at its first `.` (`a.sc` is `a`), split on
`_` into components (`f_i` is "fi"), and `uniXXXX` carries any number
of four-digit values (`uni00660069` is "fi"). Names are resolved whole
or not at all, so half a ligature is never returned. `glyph_text`
returns a String for this; `glyph_unicode` stays as the single-character
view. Hex parsing rejects the leading `+` that `from_str_radix` would
otherwise accept, and a lone surrogate half.

Both halves were verified by reverting each fix and watching the
matching tests fail. The parity note on protect.redact-patterns now
says Symbol-encoded text is skipped rather than mis-decoded.

Still open, and an owner decision: Symbol and ZapfDingbats could be
mapped properly with a glyph-name-to-Unicode table, but the vendored
Adobe Glyph List is not on the AGENTS.md 1.1 closed list.

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

2026-10-12 13:57:43 -07:00

..

acrobat-features.toml

F2: read glyph names by the naming algorithm, and stop reading Symbol as Latin

2026-10-12 13:57:43 -07:00