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Taha-Mahmoodi
2d5024bf82
Review of #3924: every `<<` in a string, comment or stream's data was read as a dictionary of its own, and in a run of `<` (an uncompressed image's flat area of grey 60) every position is one, each read to past the run, so about N²/2 bytes for N `<` and a 1 MiB run refused the file. The reader starts a dictionary there only where its repair scan tries one (after white space or a dictionary's `>>`) or after an object's `N G obj`: so only those `<<` are read, in a run of `<` only the first. A reading goes on as far as 64 KiB past the last `<<` opened on the way, looks at each nested dictionary's `>>` for a stream and marks each `<<`, so it is not read again; a comment's end of line is kept, as many readings cross the same comment; the `<<<` second-`<` reading in the main pass goes (the reader never starts there). The dictionary text a stream check parses is charged to the budget.