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vendor/README.craft-reader.md: one #831 paragraph, the follow-ups after it

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Dylan M. Taylor
2026-11-12 00:01:19 +00:00
parent 297d6c9bc9
commit fe478a7dcd
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@@ -378,6 +378,13 @@ comments label them `Craft patch (flatten)`.
| hayro-interpret `types.rs`, `x_object.rs` | `RasterImage::with_inks`: an image's samples in its own space's inks (`InkImage`), `/Decode` and `/Matte` applied, transfer functions left out, with its alpha at the alpha's own size |
| hayro-interpret `interpret/mod.rs` | The `sh` operator drops the shading's `/Background`, which only a shading pattern paints (ISO 32000-2 §8.7.4.5.1) |
Legacy encryption key length, ported from [PdfCraft #1882](https://github.com/storytold/pdfcraft/pull/1882)
(commit 344ba9f8, marked `PdfCraft patch` in `hayro-syntax/src/crypto/mod.rs`): an encryption
dictionary of revision 2–4 whose `/Length` is above 128 bits is refused with `InvalidEncryption`.
Those revisions take the file key from a 16-byte MD5 hash, so `/V 2 /R 3 /Length 256` sliced past
the hash and panicked on open. Test:
`crypto::pdfcraft_password_tests::legacy_key_length_above_128_bits_is_refused_not_a_panic`.
JBIG2 decode bounds, ported from PdfCraft commits
[85c10051](https://github.com/storytold/pdfcraft/commit/85c100514) (hayro-jbig2 patches 5 to 9),
[82439525](https://github.com/storytold/pdfcraft/commit/824395256) (patch 10) and
@@ -417,27 +424,3 @@ a decoder's limit from damage). Not ported from those commits: the page-wide all
refused-mask handling in `hayro-syntax` and `hayro-interpret` (0ed33990, 4aa732ea, e2464e14), which rest on
the decoded-image cache of 558ffd7f (a performance change). Tests: those that came with the patches in
`hayro-jbig2`, and PdfCraft's raster tests adapted in `hayro-jbig2/src/pdfcraft_tests.rs`.
Legacy encryption key length, ported from [PdfCraft #1882](https://github.com/storytold/pdfcraft/pull/1882)
(commit 344ba9f8, marked `PdfCraft patch` in `hayro-syntax/src/crypto/mod.rs`): an encryption
dictionary of revision 2–4 whose `/Length` is above 128 bits is refused with `InvalidEncryption`.
Those revisions take the file key from a 16-byte MD5 hash, so `/V 2 /R 3 /Length 256` sliced past
the hash and panicked on open. Test:
`crypto::pdfcraft_password_tests::legacy_key_length_above_128_bits_is_refused_not_a_panic`.
JBIG2 decode bounds, ported from PdfCraft commits
[85c10051](https://github.com/storytold/pdfcraft/commit/85c100514) (hayro-jbig2 patches 5 to 9),
[82439525](https://github.com/storytold/pdfcraft/commit/824395256) (patch 10) and
[10107d94](https://github.com/storytold/pdfcraft/commit/10107d943) (patch 12), marked `PdfCraft patch`
in `hayro-jbig2`: a page's segments may hold at most 64 MiB (`MAX_RETAINED_WORDS`; regions,
dictionaries, Huffman tables, retained coding contexts), a segment may refer to at most 2^20 symbols
(`MAX_REFERRED_SYMBOLS`), a halftone grid has at most 2^25 cells, a custom Huffman table 2^16 lines,
a stream with its globals 2^20 segments and 2^22 references; a stream may ask for 2^30 units of
decoding work in total (`MAX_WORK`, charged item by item before each is decoded), and an image past a
bound is refused (not drawn) like the other caps; region locations, refinement offsets, symbol corners,
Huffman range lines and integers at the end of an `i32` no longer overflow. The `/JBIG2Globals` change
of 85c10051 for hayro-syntax was already carried here. PdfCraft's raster tests are adapted in
`hayro-jbig2/src/pdfcraft_tests.rs` (`jbig2_decoding_work_is_counted_item_by_item`,
`jbig2_placements_at_the_end_of_an_i32_draw_nothing`); the unit tests in `lib.rs`, `bitmap.rs` and
`decode/symbol.rs` come with the patches. PdfCraft's later JBIG2 follow-ups (b7ec3669, 72e763ad,
e3bc4e85, patch 13 and later) are not part of this port.