diff options
Diffstat (limited to 'src/fontloader/misc/fontloader-font-tfm.lua')
| -rw-r--r-- | src/fontloader/misc/fontloader-font-tfm.lua | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/src/fontloader/misc/fontloader-font-tfm.lua b/src/fontloader/misc/fontloader-font-tfm.lua index ab03788..2dd5768 100644 --- a/src/fontloader/misc/fontloader-font-tfm.lua +++ b/src/fontloader/misc/fontloader-font-tfm.lua @@ -24,6 +24,9 @@ local constructors = fonts.constructors local encodings = fonts.encodings local tfm = constructors.newhandler("tfm") +tfm.version = 1.000 +tfm.maxnestingdepth = 5 +tfm.maxnestingsize = 65536*1024 local tfmfeatures = constructors.newfeatures("tfm") local registertfmfeature = tfmfeatures.register @@ -44,6 +47,18 @@ supplied by <l n='luatex'/>.</p> -- ofm directive blocks local path search unless set; btw, in context we -- don't support ofm files anyway as this format is obsolete +-- we need to deal with nested virtual fonts, but because we load in the +-- frontend we also need to make sure we don't nest too deep (esp when sizes +-- get large) +-- +-- (VTITLE Example of a recursion) +-- (MAPFONT D 0 (FONTNAME recurse)(FONTAT D 2)) +-- (CHARACTER C A (CHARWD D 1)(CHARHT D 1)(MAP (SETRULE D 1 D 1))) +-- (CHARACTER C B (CHARWD D 2)(CHARHT D 2)(MAP (SETCHAR C A))) +-- (CHARACTER C C (CHARWD D 4)(CHARHT D 4)(MAP (SETCHAR C B))) +-- +-- we added the same checks as below to the luatex engine + function tfm.setfeatures(tfmdata,features) local okay = constructors.initializefeatures("tfm",tfmdata,features,trace_features,report_tfm) if okay then @@ -53,9 +68,12 @@ function tfm.setfeatures(tfmdata,features) end end +local depth = { } -- table.setmetatableindex("number") + local function read_from_tfm(specification) - local filename = specification.filename - local size = specification.size + local filename = specification.filename + local size = specification.size + depth[filename] = (depth[filename] or 0) + 1 if trace_defining then report_defining("loading tfm file %a at size %s",filename,size) end @@ -103,6 +121,25 @@ local function read_from_tfm(specification) end properties.virtualized = true tfmdata.fonts = vfdata.fonts + tfmdata.type = "virtual" -- else nested calls with cummulative scaling + local fontlist = vfdata.fonts + local name = file.nameonly(filename) + for i=1,#fontlist do + local n = fontlist[i].name + local s = fontlist[i].size + local d = depth[filename] + s = constructors.scaled(s,vfdata.designsize) + if d > tfm.maxnestingdepth then + report_defining("too deeply nested virtual font %a with size %a, max nesting depth %s",n,s,tfm.maxnestingdepth) + fontlist[i] = { id = 0 } + elseif (d > 1) and (s > tfm.maxnestingsize) then + report_defining("virtual font %a exceeds size %s",n,s) + fontlist[i] = { id = 0 } + else + local t, id = fonts.constructors.readanddefine(n,s) + fontlist[i] = { id = id } + end + end end end end @@ -121,7 +158,10 @@ local function read_from_tfm(specification) resources.unicodes = { } resources.lookuptags = { } -- + depth[filename] = depth[filename] - 1 return tfmdata + else + depth[filename] = depth[filename] - 1 end end |