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Release Font Tools 0.2.0
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zemion
2026-09-02 12:18:37 +02:00
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commit 873cf3c04b
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public/docs/ARCHITECTURE.md
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# Architecture
`core/sfnt.ts` validates SFNT/WOFF headers and table boundaries before parsing.
`font.worker.ts` owns the opentype.js instance and the source bytes; the UI only
receives bounded serializable inspection records. Each load gets a new worker,
and an unresponsive operation is terminated after eight seconds. Subsetting is
a separate worker command that rebuilds a static outline font from requested
Unicode glyphs only after OS/2 restrictions are checked.
For TTC/OTC it accepts header versions 1.0 and 2.0, caps face count, validates
the complete offset array, uniqueness/alignment, each face signature and SFNT
directory, and the optional DSIG boundary. A selected face is reconstructed by
copying its bounded tables into a standalone SFNT directory with rewritten
offsets and checksum adjustment; those bytes exist only as a preview Blob and
are never offered as a round-trip-safe export.
For WOFF2 it validates the header, UIntBase128 directory, reconstructed SFNT
size, transform declarations and compressed-stream bounds before Fontkit's
browser build performs local Brotli/table decoding. This path needs neither
WebAssembly nor dynamic evaluation and therefore remains compatible with the
app's strict CSP. `font.worker.ts` owns the parser instance and source
bytes; the UI receives only bounded serializable inspection records, collection
face labels and the selected preview buffer, including variable axes and
GSUB/GPOS script, feature and lookup inventories. Each load gets a new worker,
and an unresponsive operation is terminated after eight seconds. Face switching
reuses that worker and updates its coverage/report model atomically. Subsetting
is a separate worker command that rebuilds a static outline font from requested
Unicode glyphs only after OS/2 restrictions are checked; WOFF2, variable and
collection sources are explicitly blocked.
React keeps the last successful inspection after errors. Font rendering occurs
in a scriptless sandboxed iframe. Relative assets and a same-origin service
React keeps the last successful inspection after errors. Font rendering and the
feature/language/direction comparison lab occur in a scriptless sandboxed iframe
using the browser's shaping engine. Relative assets and a same-origin service
worker support nested offline deployment.
public/docs/PRIVACY-SECURITY.md
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caps, a disposable worker and a deadline. User metadata is rendered as text;
preview HTML is escaped and confined to a scriptless sandbox.
Collection face selection keeps the original TTC/OTC in its disposable worker.
Only the selected face is reconstructed into a bounded temporary Blob for the
sandboxed preview; it is revoked on replacement and is not exposed as an export.
TTC 2.0 DSIG boundaries are validated and reported, but signatures are not
cryptographically verified.
The OS/2 `fsType` field is technical metadata, not legal advice. Font Tools
blocks subsetting when it declares restricted embedding, no-subsetting or
bitmap-only embedding, but users must still comply with the actual licence.