internal PdfDocument(ILog log,
IInputBytes inputBytes,
HeaderVersion version,
CrossReferenceTable crossReferenceTable,
bool isLenientParsing,
ParsingCachingProviders cachingProviders,
IPageFactory pageFactory,
Catalog catalog,
DocumentInformation information,
EncryptionDictionary encryptionDictionary,
IPdfTokenScanner pdfScanner,
IFilterProvider filterProvider,
AcroFormFactory acroFormFactory)
{
this.log = log;
this.inputBytes = inputBytes;
this.version = version ?? throw new ArgumentNullException(nameof(version));
this.isLenientParsing = isLenientParsing;
this.cachingProviders = cachingProviders ?? throw new ArgumentNullException(nameof(cachingProviders));
this.encryptionDictionary = encryptionDictionary;
this.pdfScanner = pdfScanner ?? throw new ArgumentNullException(nameof(pdfScanner));
this.filterProvider = filterProvider ?? throw new ArgumentNullException(nameof(filterProvider));
Information = information ?? throw new ArgumentNullException(nameof(information));
pages = new Pages(log, catalog, pageFactory, isLenientParsing, pdfScanner);
Structure = new Structure(catalog, crossReferenceTable, pdfScanner);
documentForm = new Lazy <AcroForm>(() => acroFormFactory.GetAcroForm(catalog));
}
private static DictionaryToken ParseTrailer(CrossReferenceTable crossReferenceTable, bool isLenientParsing, IPdfTokenScanner pdfTokenScanner,
out EncryptionDictionary encryptionDictionary)
{
encryptionDictionary = null;
if (crossReferenceTable.Trailer.EncryptionToken != null)
{
if (!DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner, out DictionaryToken encryptionDictionaryToken))
{
throw new PdfDocumentFormatException($"Unrecognized encryption token in trailer: {crossReferenceTable.Trailer.EncryptionToken}.");
}
encryptionDictionary = EncryptionDictionaryFactory.Read(encryptionDictionaryToken, pdfTokenScanner);
//throw new NotSupportedException("Cannot currently parse a document using encryption: " + crossReferenceTable.Trailer.EncryptionToken);
}
var rootDictionary = DirectObjectFinder.Get <DictionaryToken>(crossReferenceTable.Trailer.Root, pdfTokenScanner);
if (!rootDictionary.ContainsKey(NameToken.Type) && isLenientParsing)
{
rootDictionary = rootDictionary.With(NameToken.Type, NameToken.Catalog);
}
return(rootDictionary);
}
// This method is a basically a copy of the method UglyToad.PdfPig.Parser.PdfDocumentFactory.ParseTrailer()
private static DictionaryToken ParseCatalog(CrossReferenceTable crossReferenceTable,
IPdfTokenScanner pdfTokenScanner,
out EncryptionDictionary encryptionDictionary)
{
encryptionDictionary = null;
if (crossReferenceTable.Trailer.EncryptionToken != null)
{
if (!DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner,
out DictionaryToken encryptionDictionaryToken))
{
throw new PdfDocumentFormatException($"Unrecognized encryption token in trailer: {crossReferenceTable.Trailer.EncryptionToken}.");
}
encryptionDictionary = EncryptionDictionaryFactory.Read(encryptionDictionaryToken, pdfTokenScanner);
}
var rootDictionary = DirectObjectFinder.Get <DictionaryToken>(crossReferenceTable.Trailer.Root, pdfTokenScanner);
if (!rootDictionary.ContainsKey(NameToken.Type))
{
rootDictionary = rootDictionary.With(NameToken.Type, NameToken.Catalog);
}
return(rootDictionary);
}
internal PdfDocument(ILog log,
IInputBytes inputBytes,
HeaderVersion version,
CrossReferenceTable crossReferenceTable,
ParsingCachingProviders cachingProviders,
IPageFactory pageFactory,
Catalog catalog,
DocumentInformation information,
EncryptionDictionary encryptionDictionary,
IPdfTokenScanner pdfScanner,
ILookupFilterProvider filterProvider,
AcroFormFactory acroFormFactory,
BookmarksProvider bookmarksProvider,
bool clipPaths)
{
this.log = log;
this.inputBytes = inputBytes;
this.version = version ?? throw new ArgumentNullException(nameof(version));
this.cachingProviders = cachingProviders ?? throw new ArgumentNullException(nameof(cachingProviders));
this.encryptionDictionary = encryptionDictionary;
this.pdfScanner = pdfScanner ?? throw new ArgumentNullException(nameof(pdfScanner));
this.filterProvider = filterProvider ?? throw new ArgumentNullException(nameof(filterProvider));
this.bookmarksProvider = bookmarksProvider ?? throw new ArgumentNullException(nameof(bookmarksProvider));
this.clipPaths = clipPaths;
Information = information ?? throw new ArgumentNullException(nameof(information));
pages = new Pages(catalog, pageFactory, pdfScanner);
Structure = new Structure(catalog, crossReferenceTable, pdfScanner);
Advanced = new AdvancedPdfDocumentAccess(pdfScanner, filterProvider, catalog);
documentForm = new Lazy <AcroForm>(() => acroFormFactory.GetAcroForm(catalog));
}
public byte[] GetOwnersEncryptionKey(string ownerPassword,
string userPassword,
int revision,
EncryptionDictionary encryptionDictionary)
{
var password = string.IsNullOrWhiteSpace(ownerPassword) ? userPassword : ownerPassword;
var passwordBuffer = this.PadPassword(password);
byte[] hash;
byte[] rc4Bytes;
if (revision >= 3)
{
hash = passwordBuffer;
using (var md5 = System.Security.Cryptography.MD5.Create())
{
for (var x = 1; x <= 50; x++)
{
hash = md5.ComputeHash(hash);
}
}
var keyLength = encryptionDictionary.Length;
if (keyLength == null)
{
throw new InvalidOperationException("Missing length in encryption dictionary");
}
rc4Bytes = hash.Take(keyLength.Value).ToArray();
}
else
{
using (var md5 = System.Security.Cryptography.MD5.Create())
{
hash = md5.ComputeHash(passwordBuffer);
}
if (revision == 2)
{
rc4Bytes = new[] { hash[0], hash[1], hash[2], hash[3], hash[4] };
}
else
{
rc4Bytes = null;
}
}
passwordBuffer = PadPassword(userPassword);
//var encryptedUserPassword
return(null);
}
private static (IndirectReference, DictionaryToken) ParseTrailer(CrossReferenceTable crossReferenceTable, bool isLenientParsing, IPdfTokenScanner pdfTokenScanner,
out EncryptionDictionary encryptionDictionary)
{
encryptionDictionary = GetEncryptionDictionary(crossReferenceTable, pdfTokenScanner);
var rootDictionary = DirectObjectFinder.Get <DictionaryToken>(crossReferenceTable.Trailer.Root, pdfTokenScanner);
if (!rootDictionary.ContainsKey(NameToken.Type) && isLenientParsing)
{
rootDictionary = rootDictionary.With(NameToken.Type, NameToken.Catalog);
}
return(crossReferenceTable.Trailer.Root, rootDictionary);
}
internal PdfDocumentEncryptedException(string message, EncryptionDictionary dictionary, Exception inner) : base(message, inner)
{
Dictionary = dictionary;
}
