fix: bound knowledge-base discovery and document extraction - #117
fix: bound knowledge-base discovery and document extraction#117mldangelo-oai wants to merge 22 commits into
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decodeXml passed the parsed value of a numeric character reference straight to String.fromCodePoint with no bound, so any reference above U+10FFFF raised RangeError. That propagated out of extractDocx as "Cannot extract text from knowledge base DOCX", which reads like a corrupt file, and failed the whole prepareKnowledgeBase call -- one stray reference in one document aborted the scan along with every other knowledge-base file that was fine. Leave a reference that cannot name a Unicode scalar value as literal text, matching the unrecognized-named-entity fallback directly above it. Surrogates are excluded on the same grounds: XML forbids them, and writing one would silently encode as U+FFFD rather than throwing. Fixes #40
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| selected = [...resolved.matchAll(/null|<<[\s\S]*?>>|\d+\s+\d+\s+R/gu)][ | ||
| filterIndex | ||
| ]?.[0]; |
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When an indirect /DecodeParms array contains a legal comment or a nested parameter dictionary, this raw non-greedy matchAll can count tokens from the comment or stop at the nested dictionary's first >>, selecting or truncating the wrong filter entry. A valid LZW/Flate object stream can then be decoded with default or incomplete predictor parameters and be rejected even though PDF.js accepts it. Fresh evidence in this head is that the new indirect-array branch applies the regex directly to the unresolved lexical structure; mask comments and extract balanced top-level array elements instead.
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| const length = Number( | ||
| /\/Length\s+(\d+)(?=[\s/>])/u.exec( | ||
| pdfDictionaryLexicalValues(dictionary), | ||
| )?.[1], | ||
| ); |
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pdfCrossReferenceStream() parses /Length with a direct-only regex. For a valid object stream dictionary like /Length 12 0 R, it treats 12 as the byte length instead of resolving object 12 0, so decoding the object stream fails and compressed page dictionaries are ignored. If the missed page points at an image-tagged content stream, the preflight skips that stream and PDF.js later resolves the object stream and inflates it outside the decompression budget. Reuse the indirect /Length resolver used by the main stream pass.
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