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Re: [tor-bugs] #31917 [Applications/Tor Browser]: Investigate shipping bundled fonts on Android
#31917: Investigate shipping bundled fonts on Android
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Reporter: sysrqb | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: tbb-mobile | Actual Points:
Parent ID: #18097 | Points:
Reviewer: | Sponsor:
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Comment (by sysrqb):
Copying from ticket:31881#comment:1
> It seems like we should take note of
[https://bugzilla.mozilla.org/show_bug.cgi?id=998844#c8 comment 8]:
> {{{
> This is already possible on Android and Firefox OS, where font files in
the "font"
> sub-dir of a profile are loaded on startup:
> http://dxr.mozilla.org/mozilla-
central/source/gfx/thebes/gfxFT2FontList.cpp#1266
> }}}
>
> [https://dxr.mozilla.org/mozilla-
central/source/gfx/thebes/gfxFT2FontList.cpp#1115
gfxFT2FontList::FindFontsInOmnijar] is a slightly more helpful function
(from FF32). This was implemented in
[https://bugzilla.mozilla.org/show_bug.cgi?id=878674 Bug 878674].
>
> This is the current location: https://searchfox.org/mozilla-
esr68/source/gfx/thebes/gfxFT2FontList.cpp#1079
>
> {{{
> static const char* sJarSearchPaths[] = {
> "res/fonts/*.ttf$",
> };
> RefPtr<nsZipArchive> reader = Omnijar::GetReader(Omnijar::Type::GRE);
> for (unsigned i = 0; i < ArrayLength(sJarSearchPaths); i++) {
> nsZipFind* find;
> if (NS_SUCCEEDED(reader->FindInit(sJarSearchPaths[i], &find))) {
> const char* path;
> uint16_t len;
> while (NS_SUCCEEDED(find->FindNext(&path, &len))) {
> nsCString entryName(path, len);
> AppendFacesFromOmnijarEntry(reader, entryName, aCache,
jarChanged);
> }
> delete find;
> }
> }
> }}}
We can use this as a defense against font fingerprinting.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31917#comment:1>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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