45 Commits

Author	SHA1	Message	Date
davebrokit	f3e37eafae	Introduce IBlock and ILettersBlock interfaces (Round 2) (#1263) ... * Code review changes - Keep the Bounds property on the image classes so this isn't a major breaking API change - Don't expose letters collection * Minor fix * Switch to using BoundingBox in the library --------- Co-authored-by: davmarksman <david@brokit.co.uk>	2026-02-28 16:25:51 +00:00
Eliot Jones	9c0d6893e0	revert flate decode handling to more lenient processing (#1254) ... * revert flate decode handling to more lenient processing the change to use zlib/a adler checksum verification flow meant that invalid flate streams would not be decoded correctly. this caused issues for files that included invalid/missing checksums. this reverts the processing to the old approach for files like #1235 * fix object stream offset handling and track circular refs * update tests * normalize line endings for mac runner * fixes for mac clownery * add next pair to common crawl action * add a test case for the root cause of the int overflow	2026-02-22 15:49:50 +00:00
BobLd	0a2b1e076f	Improve HasFormXObjectCircularReference and fix #1250	2026-02-15 18:06:35 +00:00
BobLd	d6e86b057e	Handle empty encoding in Type1FontSimple and fix #1248	2026-02-10 06:14:39 +00:00
BobLd	c27f1b6553	Only throw if ArrayToken length is less than 4 in ToRectangle() and fix #1238	2026-02-01 16:10:24 +00:00
BobLd	7c4f5e2424	Introduce StackDepthGuard class to check for stack depth in CoreTokenScanner and fix #1217	2025-12-23 16:24:04 +01:00
BobLd	ee0cb1dc4a	Use file header offset when doing brute force find and fix #1223	2025-12-07 13:43:22 +00:00
BobLd	37a5dffcaa	Skip in ReadCompositeGlyph when glyphIndex is out of range and fix #1213	2025-11-21 21:31:18 +00:00
BobLd	005e52783e	Ensure no key end up missing in ResolveInternal and fix #1209	2025-11-13 14:53:28 +00:00
BobLd	f4e7db5b5b	Simply order by offset also when not doing brute force to fix #1208	2025-11-13 14:26:35 +00:00
BobLd	599ce04bef	Add test that fails before revert of e11dc6b	2025-11-07 22:31:43 +00:00
BobLd	b49e5aa697	Check for index out of range in GlyphDataTable.ReadFlags() and fix #1199	2025-11-07 19:39:18 +00:00
Bert Huijben	3592fc8438	Use zlib information to verify compressed content before using it	2025-10-15 18:46:36 +01:00
BobLd	c9034f991c	Only apply RemoveStridePadding() when bytes per pixel is one and fix #1183	2025-10-15 12:57:25 +01:00
Richard Flamsholt	d7d01f842e	Update test Issue874: No longer missing a font ... Including the stream-xref means that the formerly missing font is no longer missing, so simply run the two test-cases under the (stricter) assumption of SkipMissingFonts=false.	2025-09-30 18:35:45 +01:00
Richard Flamsholt	33a8d829ee	Update test Issue874: Also more text on page 2 ... Page two has had four more characters added, which is now delected by this xref-stream fix	2025-09-30 18:35:45 +01:00
Richard Flamsholt	57921c7e9b	Update test Issue874: Now finds more text on page 1 ... With the fix for including associated streams, this test now finds more text on the first page. I've verified using Aspose.PDF and by viewing the ErcotFacts.pdf file being tested that yes, it was indeed missing part of the text before.	2025-09-30 18:35:45 +01:00
BobLd	304d7dde5a	Use correct font matrix when transforming the width in Type 0 font and fix #1156	2025-09-14 08:22:58 +01:00
Eliot Jones	07df6fd740	read last line of ignore file (#1155) ... * read last line of ignore file - do not cancel other matrix jobs if one test fails - read all lines of the ignore list even if it doesn't end with a newline - add ignore list for 0008 and 0009 * support missing object numbers when brute-forcing the file 10404 (ironically) contains not found references with number 43 0 for its info dictionary. changes brute-force code so that objects can be entirely missing * fix test since document is now opened successfully but mediabox is broken	2025-09-13 16:57:35 +02:00
BobLd	d5b97065bd	Fix #1148	2025-09-13 10:38:35 +01:00
Eliot Jones	0afe021ad3	move file parsing to single-pass static methods (#1102) ... * move file parsing to single-pass static methods for the file 0002973.pdf in the test corpus we need to completely overhaul how initial xref parsing is done since we need to locate the xref stream by brute-force and this is currently broken. i wanted to take this opportunity to change the logic to be more imperative and less like the pdfbox methods with instance data and classes. currently the logic is split between the xref offset validator and parser methods and we call the validator logic twice, followed by brute-force searching again in the actual parser. we're going to move to a single method that performs the following steps: 1. find the first (from the end) occurrence of "startxref" and pull out the location in bytes. this will also support "startref" since some files in the wild have that 2. go to that offset if found and parse the chain of tables or streams by /prev reference 3. if any element in step 2 fails then we perform a single brute-force over the entire file and like pdfbox treat later in file-length xrefs as the ultimate arbiter of the object positions. while we do this we potentially can capture the actual object offsets since the xref positions are probably incorrect too. the aim with this is to avoid as much seeking and re-reading of bytes as possible. while this won't technically be single-pass it gets us much closer. it also removes the more strict logic requiring a "startxref" token to exist and be valid, since we can repair this by brute-force anyway. we will surface as much information as possible from the static method so that we could in future support an object explorer ui for pdfs. this will also be more resilient to invalid xref formats with e.g. comment tokens or missing newlines. * move more parsing to the static classes * plumb through the new parsing results * plug in new parser and remove old classes, port tests to new classes * update tests to reflect logic changes * apply correction when file header has offset * ignore console runner launch settings * skip offsets outside of file bounds * fix parsing tables missing a line break * use brute forced locations if they're already present * only treat line breaks and spaces as whitespace for stream content * address review comments --------- Co-authored-by: BobLd <38405645+BobLd@users.noreply.github.com>	2025-09-02 19:41:00 +01:00
BobLd	1031dcc221	Prevent StackOverflow in ParseTrailer and fix #1122	2025-08-09 08:46:04 +01:00
BobLd	813d3baa18	Track IndirectReference instead of only ObjectNumber when checking for cycles during indirect reference resolutionv and add test	2025-07-20 19:24:31 +01:00
BobLd	6a50160e65	Prevent RunLengthFilter malicious OOM	2025-06-29 13:57:01 +01:00
BobLd	d9b3891eb3	Do not throw if the Mask dictionary contains a ColorSpace key	2025-05-30 07:53:25 +01:00
BobLd	2b54a546d3	Check for infinite recursion in ObjectLocationProvider.TryGetOffset() and fix #1050	2025-05-28 20:24:31 +01:00
BobLd	5b566b53da	Only reset missed attempts count if table is found in CrossReferenceParser.Parse() and fix #1047	2025-05-27 20:57:38 +02:00
BobLd	ca9f70ffb0	Skip control chars in CoreTokenScanner.MoveNext() and fix #1048	2025-05-27 20:57:38 +02:00
BobLd	67d3dde04a	Handle TrueType case in CidFontFactory where the font is CFF, implement missing members in PdfCidCompactFontFormatFont and fix #554	2025-05-19 00:27:51 +01:00
BobLd	e4d7805a1f	Add test to ensure #822 is fixed	2025-05-18 22:32:07 +01:00
BobLd	6911f31b49	Try to repair xref offset by looking for all startxref and fix #1040	2025-05-18 17:32:27 +01:00
BobLd	afdd1f8924	Fix issue #1013	2025-04-20 18:03:04 +01:00
BobLd	74d61bd985	Fix PatternColor Equals() method and fix #1016	2025-03-26 19:48:51 +00:00
BobLd	1b3c7bd355	Better handle integer overflow in DocstrumBoundingBoxes	2025-03-02 18:29:21 +00:00
BobLd	67d8f56366	Do not throw exception when lenient parsing in GetExtendedGraphicsStateDictionary() and improve StackDictionary.TryGetValue() to not throw on empty	2025-03-02 11:51:26 +00:00
BobLd	5a06e1e1cc	Assess if transformedGlyphBounds and use transformedPdfBounds as fallback and fix #987	2025-02-20 00:11:06 +00:00
BobLd	fdb8835b37	CcittFaxDecodeFilter: do not check for input length, invert bitmap with ref byte and fix #982	2025-02-02 14:26:16 +00:00
BobLd	c4576e4ffa	Do not throw error on Pop when stack size is 1 in lenient mode and fix #973	2025-01-19 11:19:32 +00:00
BobLd	50dca593da	Do not throw exception when lenient parsing in ON in CrossReferenceParser and fix #959	2024-12-28 12:29:28 +01:00
BobLd	9ad51067b0	Handle odd ligatures names and fix #945 (#946)	2024-11-27 19:44:17 +00:00
BobLd	20804245d0	Handle alternate Unicode name representation cXXX and fix #943 (#944)	2024-11-24 20:24:36 +00:00
BobLd	40af401364	Default page number to 0 in ExplicitDestination when the Dest has no page number and fix #736	2024-10-25 21:28:11 +01:00
BobLd	e10609e4e1	Use pdfScanner in ReadVerticalDisplacements and fix #693 and return 0 in CMap on exception in ReadByte() if useLenientParsing is true and fix #692	2024-10-19 00:29:42 +01:00
BobLd	a258090e1c	Fix GetTextOrientation by cleanly checking if rotation is divisible by 90 and fix #913	2024-10-07 20:08:24 +01:00
BobLd	5c168f9cd0	Handle null token in DirectObjectFinder, handle null state in SetNamedGraphicsState(), add and test and fix #874	2024-09-29 16:43:50 +01:00