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Epub Text Bleeding Finally Fixed! (#4086)

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Co-authored-by: Amelia <77553571+Fesaa@users.noreply.github.com>
Co-authored-by: Gazy Mahomar <gmahomarf@users.noreply.github.com>
Co-authored-by: Stefans.A <104719225+privatestefans@users.noreply.github.com>
This commit is contained in:
Joe Milazzo
2025-10-11 09:18:54 -05:00
committed by GitHub
parent 75e844404c
commit f7dca3806f
48 changed files with 4616 additions and 186 deletions
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API/Helpers/PdfMetadataExtractor.cs
+43 -34
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@@ -10,41 +10,40 @@ using Microsoft.Extensions.Logging;
namespace API.Helpers;
#nullable enable
/**
* Contributed by https://github.com/microtherion
*
* All references to the "PDF Spec" (section numbers, etc.) refer to the
* PDF 1.7 Specification a.k.a. PDF32000-1:2008
* https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf
*/
/**
* Reference for PDF Metadata Format
%PDF-1.4 ← Header
// Contributed by https://github.com/microtherion
//
// All references to the "PDF Spec" (section numbers, etc.) refer to the
// PDF 1.7 Specification a.k.a. PDF32000-1:2008
// https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf
Object 1 0 obj ← Objects containing content
<< /Type /Catalog ... >>
endobj
Object 2 0 obj
<< /Type /Info ... >>
endobj
...more objects...
xref ← Cross-reference table
0 6
0000000000 65535 f
0000000015 00000 n ← Object 1 is at byte offset 15
0000000109 00000 n ← Object 2 is at byte offset 109
...
trailer ← Trailer dictionary
<< /Size 6 /Root 1 0 R /Info 2 0 R >>
startxref
1234 ← Byte offset where xref starts
%%EOF
*/
// Reference for PDF Metadata Format
// <![CDATA[
// %PDF-1.4 ← Header
//
// Object 1 0 obj ← Objects containing content
// << /Type /Catalog ... >>
// endobj
//
// Object 2 0 obj
// << /Type /Info ... >>
// endobj
//
// ...more objects...
//
// xref ← Cross-reference table
// 0 6
// 0000000000 65535 f
// 0000000015 00000 n ← Object 1 is at byte offset 15
// 0000000109 00000 n ← Object 2 is at byte offset 109
// ...
//
// trailer ← Trailer dictionary
// << /Size 6 /Root 1 0 R /Info 2 0 R >>
// startxref
// 1234 ← Byte offset where xref starts
// %%EOF
// ]]>
/// <summary>
/// Parse PDF file and try to extract as much metadata as possible.
@@ -1591,6 +1590,7 @@ internal class PdfMetadataExtractor : IPdfMetadataExtractor
case PdfLexer.TokenType.Name:
case PdfLexer.TokenType.String:
case PdfLexer.TokenType.ObjectRef:
case PdfLexer.TokenType.Keyword:
break;
case PdfLexer.TokenType.ArrayStart:
{
@@ -1602,8 +1602,17 @@ internal class PdfMetadataExtractor : IPdfMetadataExtractor
SkipDictionary();
break;
}
case PdfLexer.TokenType.StreamStart:
{
// If we encounter a stream, we need to skip it properly
// This is tricky because we need the Length from the dictionary
// For now, throw a more informative exception
throw new PdfMetadataExtractorException(
"Encountered stream object in unexpected context - PDF may have inline streams in dictionary");
}
default:
throw new PdfMetadataExtractorException("Unexpected token in SkipValue");
throw new PdfMetadataExtractorException(
$"Unexpected token type in SkipValue: {token.Type} with value: {token.Value}");
}
}