Here is a list of all files with brief descriptions:

[detail level 123]

Common
BasicTypes.h
ByteRange.h
CharTraits.h
Common.h
Exception.h
Iterator.h
Matrix2D.h
RecentlyUsedCache.h
UString.h
Crypto
AlgorithmIdentifier.h
AlgorithmParams.h
DigestAlgorithm.h
ObjectIdentifier.h
RSASSAPSSParams.h
X501AttributeTypeAndValue.h
X501DistinguishedName.h
X509Certificate.h
X509Extension.h
Doc
Doxygen
FDF
FDFDoc.h
FDFField.h
XFDFExportOptions.h
Filters
ASCII85Encode.h
Filter.h
FilterReader.h
FilterWriter.h
FlateEncode.h
MappedFile.h
MemoryFilter.h
Layout
ContentTree.h
FlowDocument.h
PDF
Annots
Caret.h
CheckBoxWidget.h
Circle.h
ComboBoxWidget.h
FileAttachment.h
FreeText.h
Highlight.h
Ink.h
Line.h
Link.h
ListBoxWidget.h
Markup.h
Movie.h
PolyLine.h
Popup.h
PushButtonWidget.h
RadioButtonGroup.h
RadioButtonWidget.h
Redaction.h
RubberStamp.h
Screen.h
SignatureWidget.h
Sound.h
Square.h
Squiggly.h
StrikeOut.h
Text.h
TextMarkup.h
TextWidget.h
Underline.h
Watermark.h
Widget.h
Image
Image2RGB.h
Image2RGBA.h
OCG
Config.h
Context.h
Group.h
OCMD.h
PDFA
PDFACompliance.h
PDFAOptions.h
PDFUA
PDFUAConformance.h
PDFUAOptions.h
Struct
AttrObj.h
ClassMap.h
ContentItem.h
RoleMap.h
SElement.h
STree.h
Action.h
ActionParameter.h
AdvancedImagingConvertOptions.h
AdvancedImagingModule.h
Annot.h
Annots.h
BarcodeModule.h
BarcodeOptions.h
Bookmark.h
CADConvertOptions.h
CADModule.h
Callback.h
CharData.h
CMSSignatureOptions.h
ColorSpace.h
ContentEdit.h
ContentReplacer.h
ConversionOptions.h
Convert.h
CubicCurveBuilder.h
DataExtractionModule.h
DataExtractionOptions.h
Date.h
Destination.h
DiffOptions.h
DigitalSignatureField.h
DisallowedChange.h
DocumentConversion.h
DocumentPreviewCache.h
Element.h
ElementBuilder.h
ElementReader.h
ElementWriter.h
EmbeddedTimestampVerificationResult.h
ExternalAnnotManager.h
Field.h
FileSpec.h
FindReplace.h
FindReplaceOptions.h
Flattener.h
Font.h
Function.h
GeometryCollection.h
GState.h
Highlights.h
HTML2PDF.h
Image.h
JobRequest.h
KeyStrokeActionResult.h
KeyStrokeEventData.h
LinkInfo.h
MarkdownToPDFOptions.h
MergeXFDFOptions.h
OCRModule.h
OCROptions.h
OfficeLocaleOverrides.h
OfficeToPDFOptions.h
Optimizer.h
OptionsBase.h
Page.h
PageLabel.h
PageSet.h
PathData.h
PatternColor.h
PDF2HtmlReflowParagraphsModule.h
PDF2WordModule.h
PDFDC.h
PDFDCEX.h
PDFDoc.h
PDFDocGenerator.h
PDFDocInfo.h
PDFDocViewPrefs.h
PDFDraw.h
PDFNet.h
PDFNetInternalTools.h
PDFRasterizer.h
PDFView.h
PDFViewCtrl.h
Point.h
Print.h
PrintToPdfModule.h
PrintToPdfOptions.h
QuadPoint.h
Rect.h
RectCollection.h
Redactor.h
Reflow.h
ReflowProcessor.h
RefreshOptions.h
Selection.h
Shading.h
ShapedText.h
Stamper.h
StructuredOutputModule.h
SVGConvertOptions.h
TaggingOptions.h
TemplateDocument.h
TextDiffOptions.h
TextExtractor.h
TextRange.h
TextSearch.h
TimestampingConfiguration.h
TimestampingResult.h
TransPDF.h
TransPDFOptions.h
TrustVerificationResult.h
VerificationOptions.h
VerificationResult.h
ViewChangeCollection.h
ViewerOptimizedOptions.h
WebFontDownloader.h
WordToPDFOptions.h
SDF
DictIterator.h
DocSnapshot.h
NameTree.h
NumberTree.h
Obj.h
ObjSet.h
PDFTronCustomSecurityHandler.h
ResultSnapshot.h
SDFDoc.h
SecurityHandler.h
SignatureHandler.h
UndoManager.h