#249 made the reduced repros of #234 open, but a real file saved by the
reference app (version 30) still fell back to its screen-resolution preview
with "typecheck in `a dictionary`". Running its prolog to the end needed:
- The standard dictionaries (systemdict, userdict, globaldict, statusdict,
errordict, $error) as values in systemdict, so `/globaldict where
{ /globaldict get begin } if` gets a dictionary, not an operator.
SharedFontDirectory names the font directory too. errordict has a
handleerror for prologs that wrap it.
- `dictstack`, `internaldict`, `currentsystemparams` and
`currentuserparams` (with the cache sizes programs `get`), and `cshow`.
- Executable files: `cvx` and `cvlit` set a file's attribute, `xcheck`
reads it, and executing one runs its data as a program, as the prolog
does with `(...) 0 () /SubFileDecode filter cvx exec`.
- SubFileDecode with a count of 0 and an empty end string passes its
whole source through instead of nothing.
- `flushfile` on a filter over the program's data skips that data (the
file's XMP packet). A filter chained from a pending one leaves it
nothing to skip, so the writer's own `VCsrc flushfile` is unchanged.
The interpreter empties its standard dictionaries when it finishes, since
systemdict now holds itself. Both real files tested now import as 15
vector paths in CMYK with no warnings, and round-trip through SVG and PDF
pixel for pixel. The EPS fuzzer exercises the new operators.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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