/// <summary>
/// Get any embedded files contained in this PDF document.
/// Since PDF 1.3 any external file referenced by the document may have its contents embedded within the referring PDF file,
/// allowing its contents to be stored or transmitted along with the PDF file.
/// </summary>
/// <param name="embeddedFiles">The set of embedded files in this document.</param>
/// <returns><see langword="true"/> if this document contains more than zero embedded files, otherwise <see langword="false"/>.</returns>
public bool TryGetEmbeddedFiles(out IReadOnlyList <EmbeddedFile> embeddedFiles)
{
GuardDisposed();
embeddedFiles = null;
if (!catalog.CatalogDictionary.TryGet(NameToken.Names, pdfScanner, out DictionaryToken namesDictionary) ||
!namesDictionary.TryGet(NameToken.EmbeddedFiles, pdfScanner, out DictionaryToken embeddedFileNamesDictionary))
{
return(false);
}
var embeddedFileNames = NameTreeParser.FlattenNameTreeToDictionary(embeddedFileNamesDictionary, pdfScanner, isLenientParsing,
x => x);
if (embeddedFileNames.Count == 0)
{
return(false);
}
var result = new List <EmbeddedFile>();
foreach (var keyValuePair in embeddedFileNames)
{
if (!DirectObjectFinder.TryGet(keyValuePair.Value, pdfScanner, out DictionaryToken fileDescriptorDictionaryToken) ||
!fileDescriptorDictionaryToken.TryGet(NameToken.Ef, pdfScanner, out DictionaryToken efDictionary) ||
!efDictionary.TryGet(NameToken.F, pdfScanner, out StreamToken fileStreamToken))
{
continue;
}
var fileSpecification = string.Empty;
if (fileDescriptorDictionaryToken.TryGet(NameToken.F, pdfScanner, out IDataToken <string> fileSpecificationToken))
{
fileSpecification = fileSpecificationToken.Data;
}
var fileBytes = fileStreamToken.Decode(filterProvider);
result.Add(new EmbeddedFile(keyValuePair.Key, fileSpecification, fileBytes, fileStreamToken));
}
embeddedFiles = result;
return(embeddedFiles.Count > 0);
}
private static IReadOnlyDictionary <string, ExplicitDestination> ReadNamedDestinations(Catalog catalog, IPdfTokenScanner pdfScanner,
ILog log)
{
var result = new Dictionary <string, ExplicitDestination>();
if (catalog.CatalogDictionary.TryGet(NameToken.Dests, pdfScanner, out DictionaryToken dests))
{
/*
* In PDF 1.1, the correspondence between name objects and destinations is defined by the /Dests entry in the document catalog.
* The value of this entry is a dictionary in which each key is a destination name and the corresponding value is either an array
* defining the destination, using the explicit destination syntax, or a dictionary with a /D entry whose value is such an array.
*/
foreach (var kvp in dests.Data)
{
var value = kvp.Value;
if (TryReadExplicitDestination(value, catalog, pdfScanner, log, out var destination))
{
result[kvp.Key] = destination;
}
}
}
else if (catalog.CatalogDictionary.TryGet(NameToken.Names, pdfScanner, out DictionaryToken names) &&
names.TryGet(NameToken.Dests, pdfScanner, out dests))
{
/*
* In PDF 1.2, the correspondence between strings and destinations is defined by the /Dests entry in the document's name dictionary.
* The value of the /Dests entry is a name tree mapping name strings to destinations.
* The keys in the name tree may be treated as text strings for display purposes.
* The destination value associated with a key in the name tree may be either an array or a dictionary.
*/
NameTreeParser.FlattenNameTree(dests, pdfScanner, value =>
{
if (TryReadExplicitDestination(value, catalog, pdfScanner, log, out var destination))
{
return(destination);
}
return(null);
}, result);
}
return(result);
}
