private string SafeKeyAccess(DictionaryToken dictionary, NameToken keyName)
{
if (!dictionary.TryGet(keyName, out var token))
{
return(string.Empty);
}
if (token is StringToken str)
{
return(str.Data);
}
if (token is HexToken hex)
{
return(hex.Data);
}
if (token is IndirectReferenceToken obj)
{
if (DirectObjectFinder.TryGet(obj, pdfScanner, out StringToken stringToken))
{
return(stringToken.Data);
}
if (DirectObjectFinder.TryGet(obj, pdfScanner, out HexToken hexToken))
{
return(hexToken.Data);
}
throw new PdfDocumentFormatException($"Could not get key for name: {keyName} in {dictionary}.");
}
return(string.Empty);
}
// This method is a basically a copy of the method UglyToad.PdfPig.Parser.PdfDocumentFactory.ParseTrailer()
private static DictionaryToken ParseCatalog(CrossReferenceTable crossReferenceTable,
IPdfTokenScanner pdfTokenScanner,
out EncryptionDictionary encryptionDictionary)
{
encryptionDictionary = null;
if (crossReferenceTable.Trailer.EncryptionToken != null)
{
if (!DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner,
out DictionaryToken encryptionDictionaryToken))
{
throw new PdfDocumentFormatException($"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);
}
private CropBox GetCropBox(DictionaryToken dictionary, PageTreeMembers pageTreeMembers, MediaBox mediaBox)
{
CropBox cropBox;
if (dictionary.TryGet(NameToken.CropBox, out var cropBoxObject) &&
DirectObjectFinder.TryGet(cropBoxObject, pdfScanner, out ArrayToken cropBoxArray))
{
if (cropBoxArray.Length != 4)
{
log.Error($"The CropBox was the wrong length in the dictionary: {dictionary}. Array was: {cropBoxArray}. Using MediaBox.");
cropBox = new CropBox(mediaBox.Bounds);
return(cropBox);
}
cropBox = new CropBox(cropBoxArray.ToIntRectangle(pdfScanner));
}
else
{
cropBox = pageTreeMembers.GetCropBox() ?? new CropBox(mediaBox.Bounds);
}
return(cropBox);
}
private MediaBox GetMediaBox(int number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers)
{
MediaBox mediaBox;
if (dictionary.TryGet(NameToken.MediaBox, out var mediaboxObject) &&
DirectObjectFinder.TryGet(mediaboxObject, pdfScanner, out ArrayToken mediaboxArray))
{
if (mediaboxArray.Length != 4)
{
log.Error($"The MediaBox was the wrong length in the dictionary: {dictionary}. Array was: {mediaboxArray}. Defaulting to US Letter.");
mediaBox = MediaBox.Letter;
return(mediaBox);
}
mediaBox = new MediaBox(mediaboxArray.ToIntRectangle(pdfScanner));
}
else
{
mediaBox = pageTreeMembers.MediaBox;
if (mediaBox == null)
{
log.Error($"The MediaBox was the wrong missing for page {number}. Using US Letter.");
// PDFBox defaults to US Letter.
mediaBox = MediaBox.Letter;
}
}
return(mediaBox);
}
private AcroFieldBase GetTextField(DictionaryToken fieldDictionary, NameToken fieldType, uint fieldFlags, AcroFieldCommonInformation information)
{
var textFlags = (AcroTextFieldFlags)fieldFlags;
var textValue = default(string);
if (fieldDictionary.TryGet(NameToken.V, out var textValueToken))
{
if (DirectObjectFinder.TryGet(textValueToken, tokenScanner, out StringToken valueStringToken))
{
textValue = valueStringToken.Data;
}
else if (DirectObjectFinder.TryGet(textValueToken, tokenScanner, out HexToken valueHexToken))
{
textValue = valueHexToken.Data;
}
else if (DirectObjectFinder.TryGet(textValueToken, tokenScanner, out StreamToken valueStreamToken))
{
textValue = OtherEncodings.BytesAsLatin1String(valueStreamToken.Decode(filterProvider).ToArray());
}
}
var maxLength = default(int?);
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.MaxLen, tokenScanner, out NumericToken maxLenToken))
{
maxLength = maxLenToken.Int;
}
var field = new AcroTextField(fieldDictionary, fieldType, textFlags, information, textValue, maxLength);
return(field);
}
private static DictionaryToken ParseTrailer(CrossReferenceTable crossReferenceTable, bool isLenientParsing, IPdfTokenScanner pdfTokenScanner,
out EncryptionDictionary encryptionDictionary)
{
encryptionDictionary = null;
if (crossReferenceTable.Trailer.EncryptionToken != null)
{
if (!DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner, out DictionaryToken encryptionDictionaryToken))
{
throw new PdfDocumentFormatException($"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);
}
public IFont Generate(DictionaryToken dictionary, bool isLenientParsing)
{
var baseFont = dictionary.GetNameOrDefault(NameToken.BaseFont);
var cMap = ReadEncoding(dictionary, out var isCMapPredefined);
ICidFont cidFont;
if (TryGetFirstDescendant(dictionary, out var descendantObject))
{
DictionaryToken descendantFontDictionary;
if (descendantObject is IndirectReferenceToken obj)
{
var parsed = DirectObjectFinder.Get<DictionaryToken>(obj, scanner);
descendantFontDictionary = parsed;
}
else
{
descendantFontDictionary = (DictionaryToken) descendantObject;
}
cidFont = ParseDescendant(descendantFontDictionary, isLenientParsing);
}
else
{
throw new InvalidFontFormatException("No descendant font dictionary was declared for this Type 0 font. This dictionary should contain the CIDFont for the Type 0 font. " + dictionary);
}
var (ucs2CMap, isChineseJapaneseOrKorean) = GetUcs2CMap(dictionary, isCMapPredefined, cidFont);
CMap toUnicodeCMap = null;
if (dictionary.ContainsKey(NameToken.ToUnicode))
{
var toUnicodeValue = dictionary.Data[NameToken.ToUnicode];
if (DirectObjectFinder.TryGet<StreamToken>(toUnicodeValue, scanner, out var toUnicodeStream))
{
var decodedUnicodeCMap = toUnicodeStream?.Decode(filterProvider);
if (decodedUnicodeCMap != null)
{
toUnicodeCMap = CMapCache.Parse(new ByteArrayInputBytes(decodedUnicodeCMap), isLenientParsing);
}
}
else if (DirectObjectFinder.TryGet<NameToken>(toUnicodeValue, scanner, out var toUnicodeName))
{
toUnicodeCMap = CMapCache.Get(toUnicodeName.Data);
}
else
{
throw new PdfDocumentFormatException($"Invalid type of toUnicode CMap encountered. Got: {toUnicodeValue}.");
}
}
var font = new Type0Font(baseFont, cidFont, cMap, toUnicodeCMap, ucs2CMap, isChineseJapaneseOrKorean);
return font;
}
private ICidFontProgram ReadDescriptorFile(FontDescriptor descriptor)
{
if (descriptor?.FontFile == null)
{
return(null);
}
var fontFileStream = DirectObjectFinder.Get <StreamToken>(descriptor.FontFile.ObjectKey, pdfScanner);
if (fontFileStream == null)
{
return(null);
}
var fontFile = fontFileStream.Decode(filterProvider);
switch (descriptor.FontFile.FileType)
{
case DescriptorFontFile.FontFileType.TrueType:
var input = new TrueTypeDataBytes(new ByteArrayInputBytes(fontFile));
return(trueTypeFontParser.Parse(input));
case DescriptorFontFile.FontFileType.FromSubtype:
{
if (!DirectObjectFinder.TryGet(descriptor.FontFile.ObjectKey, pdfScanner, out StreamToken str))
{
throw new NotSupportedException("Cannot read CID font from subtype.");
}
if (!str.StreamDictionary.TryGet(NameToken.Subtype, out NameToken subtypeName))
{
throw new PdfDocumentFormatException($"The font file stream did not contain a subtype entry: {str.StreamDictionary}.");
}
if (subtypeName == NameToken.CidFontType0C)
{
var bytes = str.Decode(filterProvider);
var font = compactFontFormatParser.Parse(new CompactFontFormatData(bytes));
return(font);
}
if (subtypeName == NameToken.Type1C)
{
}
else if (subtypeName == NameToken.OpenType)
{
}
else
{
throw new PdfDocumentFormatException($"Unexpected subtype for CID font: {subtypeName}.");
}
throw new NotSupportedException("Cannot read CID font from subtype.");
}
default:
throw new NotSupportedException("Currently only TrueType fonts are supported.");
}
}
public static bool TryGetOptionalTokenDirect <T>(this DictionaryToken token, NameToken name, IPdfTokenScanner scanner, out T result) where T : IToken
{
result = default(T);
if (token.TryGet(name, out var appearancesToken) && DirectObjectFinder.TryGet(appearancesToken, scanner, out T innerResult))
{
result = innerResult;
return(true);
}
return(false);
}
public IFont GetFontDirectly(IndirectReferenceToken fontReferenceToken, bool isLenientParsing)
{
if (!DirectObjectFinder.TryGet(fontReferenceToken, scanner, out DictionaryToken fontDictionaryToken))
{
throw new PdfDocumentFormatException($"The requested font reference token {fontReferenceToken} wasn't a font.");
}
var font = fontFactory.Get(fontDictionaryToken, isLenientParsing);
return(font);
}
public void TryGetCanFollowMultipleReferenceLinks()
{
var reference1 = new IndirectReference(7, 0);
var reference2 = new IndirectReference(9, 0);
scanner.Objects[reference1] = new ObjectToken(10, reference1, new IndirectReferenceToken(reference2));
scanner.Objects[reference2] = new ObjectToken(12, reference2, new NumericToken(69));
Assert.True(DirectObjectFinder.TryGet(new IndirectReferenceToken(reference1), scanner, out NumericToken result));
Assert.Equal(69, result.Int);
}
public IReadOnlyList <IFilter> GetFilters(DictionaryToken dictionary, IPdfTokenScanner scanner)
{
if (dictionary == null)
{
throw new ArgumentNullException(nameof(dictionary));
}
var token = dictionary.GetObjectOrDefault(NameToken.Filter, NameToken.F);
if (token == null)
{
return(EmptyArray <IFilter> .Instance);
}
switch (token)
{
case ArrayToken filters:
var result = new NameToken[filters.Data.Count];
for (var i = 0; i < filters.Data.Count; i++)
{
var filterToken = filters.Data[i];
var filterName = (NameToken)filterToken;
result[i] = filterName;
}
return(GetNamedFilters(result));
case NameToken name:
return(GetNamedFilters(new[] { name }));
case IndirectReferenceToken irt:
if (DirectObjectFinder.TryGet <NameToken>(irt, scanner, out var indirectName))
{
return(GetNamedFilters(new [] { indirectName }));
}
else if (DirectObjectFinder.TryGet <ArrayToken>(irt, scanner, out var indirectArray))
{
return(GetNamedFilters(indirectArray.Data.Select(x => (NameToken)x).ToList()));
}
else
{
throw new PdfDocumentFormatException($"The filter for the stream was not a valid object. Expected name or array, instead got: {token}.");
}
default:
throw new PdfDocumentFormatException($"The filter for the stream was not a valid object. Expected name or array, instead got: {token}.");
}
}
/// <summary>
/// Try and get the entry with a given name and type or look-up the object if it's an indirect reference.
/// </summary>
internal static bool TryGet <T>(this DictionaryToken dictionary, NameToken name, IPdfTokenScanner tokenScanner, out T token) where T : IToken
{
token = default(T);
if (!dictionary.TryGet(name, out var t) || !(t is T typedToken))
{
if (t is IndirectReferenceToken reference)
{
return(DirectObjectFinder.TryGet(reference, tokenScanner, out token));
}
return(false);
}
token = typedToken;
return(true);
}
/// <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 IReadOnlyDictionary <int, double> ReadWidths(DictionaryToken dict)
{
var widths = new Dictionary <int, double>();
if (!dict.TryGet(NameToken.W, pdfScanner, out ArrayToken widthArray))
{
return(widths);
}
var size = widthArray.Data.Count;
var counter = 0;
while (counter < size)
{
var firstCode = DirectObjectFinder.Get <NumericToken>(widthArray.Data[counter++], pdfScanner);
var next = widthArray.Data[counter++];
if (DirectObjectFinder.TryGet(next, pdfScanner, out ArrayToken array))
{
var startRange = firstCode.Int;
var arraySize = array.Data.Count;
for (var i = 0; i < arraySize; i++)
{
var width = DirectObjectFinder.Get <NumericToken>(array.Data[i], pdfScanner);
widths[startRange + i] = width.Double;
}
}
else
{
var secondCode = DirectObjectFinder.Get <NumericToken>(next, pdfScanner);
var rangeWidth = DirectObjectFinder.Get <NumericToken>(widthArray.Data[counter++], pdfScanner);
var startRange = firstCode.Int;
var endRange = secondCode.Int;
var width = rangeWidth.Double;
for (var i = startRange; i <= endRange; i++)
{
widths[i] = width;
}
}
}
return(widths);
}
private IReadOnlyDictionary <int, decimal> ReadWidths(DictionaryToken dict)
{
var widths = new Dictionary <int, decimal>();
if (!dict.TryGet(NameToken.W, out var widthsItem) || !(widthsItem is ArrayToken widthArray))
{
return(widths);
}
int size = widthArray.Data.Count;
int counter = 0;
while (counter < size)
{
var firstCode = (NumericToken)widthArray.Data[counter++];
var next = widthArray.Data[counter++];
if (DirectObjectFinder.TryGet(next, pdfScanner, out ArrayToken array))
{
int startRange = firstCode.Int;
int arraySize = array.Data.Count;
for (int i = 0; i < arraySize; i++)
{
var width = (NumericToken)array.Data[i];
widths[startRange + i] = width.Data;
}
}
else
{
var secondCode = (NumericToken)next;
var rangeWidth = (NumericToken)widthArray.Data[counter++];
int startRange = firstCode.Int;
int endRange = secondCode.Int;
var width = rangeWidth.Data;
for (var i = startRange; i <= endRange; i++)
{
widths[i] = width;
}
}
}
return(widths);
}
private static bool TryReadExplicitDestination(IToken value, Catalog catalog, IPdfTokenScanner pdfScanner,
ILog log, out ExplicitDestination destination)
{
destination = null;
if (DirectObjectFinder.TryGet(value, pdfScanner, out ArrayToken valueArray) &&
TryGetExplicitDestination(valueArray, catalog, log, out destination))
{
return(true);
}
if (DirectObjectFinder.TryGet(value, pdfScanner, out DictionaryToken valueDictionary) &&
valueDictionary.TryGet(NameToken.D, pdfScanner, out valueArray) &&
TryGetExplicitDestination(valueArray, catalog, log, out destination))
{
return(true);
}
return(false);
}
private CharacterIdentifierToGlyphIndexMap GetCharacterIdentifierToGlyphIndexMap(DictionaryToken dictionary)
{
if (!dictionary.TryGet(NameToken.CidToGidMap, out var entry))
{
return(new CharacterIdentifierToGlyphIndexMap());
}
if (DirectObjectFinder.TryGet(entry, pdfScanner, out NameToken _))
{
return(new CharacterIdentifierToGlyphIndexMap());
}
if (!DirectObjectFinder.TryGet(entry, pdfScanner, out StreamToken stream))
{
throw new PdfDocumentFormatException($"No stream or name token found for /CIDToGIDMap in dictionary: {dictionary}.");
}
var bytes = stream.Decode(filterProvider, pdfScanner);
return(new CharacterIdentifierToGlyphIndexMap(bytes));
}
private string GetNamedString(NameToken name, DictionaryToken dictionary)
{
string content = null;
if (dictionary.TryGet(name, out var contentToken))
{
if (contentToken is StringToken contentString)
{
content = contentString.Data;
}
else if (contentToken is HexToken contentHex)
{
content = contentHex.Data;
}
else if (DirectObjectFinder.TryGet(contentToken, tokenScanner, out StringToken indirectContentString))
{
content = indirectContentString.Data;
}
}
return(content);
}
private static EncryptionDictionary GetEncryptionDictionary(CrossReferenceTable crossReferenceTable, IPdfTokenScanner pdfTokenScanner)
{
if (crossReferenceTable.Trailer.EncryptionToken == null)
{
return(null);
}
if (!DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner, out DictionaryToken encryptionDictionaryToken))
{
if (DirectObjectFinder.TryGet(crossReferenceTable.Trailer.EncryptionToken, pdfTokenScanner, out NullToken _))
{
return(null);
}
throw new PdfDocumentFormatException($"Unrecognized encryption token in trailer: {crossReferenceTable.Trailer.EncryptionToken}.");
}
var result = EncryptionDictionaryFactory.Read(encryptionDictionaryToken, pdfTokenScanner);
return(result);
}
private static void ExtractNameTree(DictionaryToken nameTreeNodeDictionary, Catalog catalog, IPdfTokenScanner pdfScanner,
bool isLenientParsing,
ILog log,
Dictionary <string, ExplicitDestination> explicitDestinations)
{
if (nameTreeNodeDictionary.TryGet(NameToken.Names, pdfScanner, out ArrayToken nodeNames))
{
for (var i = 0; i < nodeNames.Length; i += 2)
{
if (!(nodeNames[i] is IDataToken <string> key))
{
continue;
}
var value = nodeNames[i + 1];
if (TryReadExplicitDestination(value, catalog, pdfScanner, log, out var destination))
{
explicitDestinations[key.Data] = destination;
}
}
}
if (nameTreeNodeDictionary.TryGet(NameToken.Kids, pdfScanner, out ArrayToken kids))
{
foreach (var kid in kids.Data)
{
if (DirectObjectFinder.TryGet(kid, pdfScanner, out DictionaryToken kidDictionary))
{
ExtractNameTree(kidDictionary, catalog, pdfScanner, isLenientParsing, log, explicitDestinations);
}
else if (!isLenientParsing)
{
throw new PdfDocumentFormatException($"Invalid kids entry in PDF name tree: {kid} in {kids}.");
}
}
}
}
public Encoding Read(DictionaryToken fontDictionary, FontDescriptor descriptor = null,
Encoding fontEncoding = null)
{
if (!fontDictionary.TryGet(NameToken.Encoding, out var baseEncodingObject))
{
return(null);
}
if (DirectObjectFinder.TryGet(baseEncodingObject, pdfScanner, out NameToken name))
{
if (TryGetNamedEncoding(descriptor, name, out var namedEncoding))
{
return(namedEncoding);
}
if (fontDictionary.TryGet(NameToken.BaseFont, pdfScanner, out NameToken baseFontName))
{
if (string.Equals(baseFontName.Data, "ZapfDingbats", StringComparison.OrdinalIgnoreCase))
{
return(ZapfDingbatsEncoding.Instance);
}
if (string.Equals(baseFontName.Data, "Symbol", StringComparison.OrdinalIgnoreCase))
{
return(SymbolEncoding.Instance);
}
return(WinAnsiEncoding.Instance);
}
}
DictionaryToken encodingDictionary = DirectObjectFinder.Get <DictionaryToken>(baseEncodingObject, pdfScanner);
var encoding = ReadEncodingDictionary(encodingDictionary, fontEncoding);
return(encoding);
}
private MediaBox GetMediaBox(int number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers, bool isLenientParsing)
{
MediaBox mediaBox;
if (dictionary.TryGet(NameToken.MediaBox, out var mediaboxObject) &&
DirectObjectFinder.TryGet(mediaboxObject, pdfScanner, out ArrayToken mediaboxArray))
{
if (mediaboxArray.Length != 4 && isLenientParsing)
{
log.Error($"The MediaBox was the wrong length in the dictionary: {dictionary}. Array was: {mediaboxArray}.");
mediaBox = MediaBox.A4;
return(mediaBox);
}
mediaBox = new MediaBox(mediaboxArray.ToIntRectangle());
}
else
{
mediaBox = pageTreeMembers.MediaBox;
if (mediaBox == null)
{
if (isLenientParsing)
{
mediaBox = MediaBox.A4;
}
else
{
throw new InvalidOperationException("No mediabox was present for page: " + number);
}
}
}
return(mediaBox);
}
public AcroForm GetAcroForm(Catalog catalog)
{
if (!catalog.CatalogDictionary.TryGet(NameToken.AcroForm, out var acroRawToken) || !DirectObjectFinder.TryGet(acroRawToken, tokenScanner, out DictionaryToken acroDictionary))
{
return(null);
}
var signatureFlags = (SignatureFlags)0;
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.SigFlags, tokenScanner, out NumericToken signatureToken))
{
signatureFlags = (SignatureFlags)signatureToken.Int;
}
var needAppearances = false;
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.NeedAppearances, tokenScanner, out BooleanToken appearancesToken))
{
needAppearances = appearancesToken.Data;
}
var calculationOrder = default(ArrayToken);
acroDictionary.TryGetOptionalTokenDirect(NameToken.Co, tokenScanner, out calculationOrder);
var formResources = default(DictionaryToken);
acroDictionary.TryGetOptionalTokenDirect(NameToken.Dr, tokenScanner, out formResources);
var da = default(string);
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Da, tokenScanner, out StringToken daToken))
{
da = daToken.Data;
}
else if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Da, tokenScanner, out HexToken daHexToken))
{
da = daHexToken.Data;
}
var q = default(int?);
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Q, tokenScanner, out NumericToken qToken))
{
q = qToken.Int;
}
var fieldsToken = acroDictionary.Data[NameToken.Fields.Data];
if (!DirectObjectFinder.TryGet(fieldsToken, tokenScanner, out ArrayToken fieldsArray))
{
throw new PdfDocumentFormatException($"Could not retrieve the fields array for an AcroForm: {acroDictionary}.");
}
var fields = new Dictionary <IndirectReference, AcroFieldBase>(fieldsArray.Length);
foreach (var fieldToken in fieldsArray.Data)
{
if (!(fieldToken is IndirectReferenceToken fieldReferenceToken))
{
throw new PdfDocumentFormatException($"The fields array should only contain indirect references, instead got: {fieldToken}.");
}
var fieldDictionary = DirectObjectFinder.Get <DictionaryToken>(fieldToken, tokenScanner);
var field = GetAcroField(fieldDictionary, catalog, new List <DictionaryToken>(0));
fields[fieldReferenceToken.Data] = field;
}
return(new AcroForm(acroDictionary, signatureFlags, needAppearances, fields));
}
private AcroFieldBase GetChoiceField(DictionaryToken fieldDictionary, NameToken fieldType,
uint fieldFlags,
AcroFieldCommonInformation information,
int?pageNumber,
PdfRectangle?bounds)
{
var selectedOptions = EmptyArray <string> .Instance;
if (fieldDictionary.TryGet(NameToken.V, out var valueToken))
{
if (DirectObjectFinder.TryGet(valueToken, tokenScanner, out StringToken valueString))
{
selectedOptions = new[] { valueString.Data };
}
else if (DirectObjectFinder.TryGet(valueToken, tokenScanner, out HexToken valueHex))
{
selectedOptions = new[] { valueHex.Data };
}
else if (DirectObjectFinder.TryGet(valueToken, tokenScanner, out ArrayToken valueArray))
{
selectedOptions = new string[valueArray.Length];
for (var i = 0; i < valueArray.Length; i++)
{
var valueOptToken = valueArray.Data[i];
if (DirectObjectFinder.TryGet(valueOptToken, tokenScanner, out StringToken valueOptString))
{
selectedOptions[i] = valueOptString.Data;
}
else if (DirectObjectFinder.TryGet(valueOptToken, tokenScanner, out HexToken valueOptHex))
{
selectedOptions[i] = valueOptHex.Data;
}
}
}
}
var selectedIndices = default(int[]);
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.I, tokenScanner, out ArrayToken indicesArray))
{
selectedIndices = new int[indicesArray.Length];
for (var i = 0; i < indicesArray.Data.Count; i++)
{
var token = indicesArray.Data[i];
var numericToken = DirectObjectFinder.Get <NumericToken>(token, tokenScanner);
selectedIndices[i] = numericToken.Int;
}
}
var options = new List <AcroChoiceOption>();
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.Opt, tokenScanner, out ArrayToken optionsArrayToken))
{
for (var i = 0; i < optionsArrayToken.Data.Count; i++)
{
var optionToken = optionsArrayToken.Data[i];
if (DirectObjectFinder.TryGet(optionToken, tokenScanner, out StringToken optionStringToken))
{
var name = optionStringToken.Data;
var isSelected = IsChoiceSelected(selectedOptions, selectedIndices, i, name);
options.Add(new AcroChoiceOption(i, isSelected, optionStringToken.Data));
}
else if (DirectObjectFinder.TryGet(optionToken, tokenScanner, out HexToken optionHexToken))
{
var name = optionHexToken.Data;
var isSelected = IsChoiceSelected(selectedOptions, selectedIndices, i, name);
options.Add(new AcroChoiceOption(i, isSelected, optionHexToken.Data));
}
else if (DirectObjectFinder.TryGet(optionToken, tokenScanner, out ArrayToken optionArrayToken))
{
if (optionArrayToken.Length != 2)
{
throw new PdfDocumentFormatException($"An option array containing array elements should contain 2 strings, instead got: {optionArrayToken}.");
}
string exportValue;
if (DirectObjectFinder.TryGet(optionArrayToken.Data[0], tokenScanner, out StringToken exportValueStringToken))
{
exportValue = exportValueStringToken.Data;
}
else if (DirectObjectFinder.TryGet(optionArrayToken.Data[0], tokenScanner, out HexToken exportValueHexToken))
{
exportValue = exportValueHexToken.Data;
}
else
{
throw new PdfDocumentFormatException($"An option array array element's first value should be the export value string, instead got: {optionArrayToken.Data[0]}.");
}
string name;
if (DirectObjectFinder.TryGet(optionArrayToken.Data[1], tokenScanner, out StringToken nameStringToken))
{
name = nameStringToken.Data;
}
else if (DirectObjectFinder.TryGet(optionArrayToken.Data[1], tokenScanner, out HexToken nameHexToken))
{
name = nameHexToken.Data;
}
else
{
throw new PdfDocumentFormatException($"An option array array element's second value should be the option name string, instead got: {optionArrayToken.Data[1]}.");
}
var isSelected = IsChoiceSelected(selectedOptions, selectedIndices, i, name);
options.Add(new AcroChoiceOption(i, isSelected, name, exportValue));
}
else
{
throw new PdfDocumentFormatException($"An option array should contain either strings or 2 element arrays, instead got: {optionToken}.");
}
}
}
var choiceFlags = (AcroChoiceFieldFlags)fieldFlags;
if (choiceFlags.HasFlag(AcroChoiceFieldFlags.Combo))
{
var field = new AcroComboBoxField(fieldDictionary, fieldType, choiceFlags, information,
options,
selectedOptions,
selectedIndices,
pageNumber,
bounds);
return(field);
}
var topIndex = default(int?);
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.Ti, tokenScanner, out NumericToken topIndexToken))
{
topIndex = topIndexToken.Int;
}
return(new AcroListBoxField(fieldDictionary, fieldType, choiceFlags, information,
options,
selectedOptions,
selectedIndices,
topIndex,
pageNumber,
bounds));
}
public IEnumerable <Annotation> GetAnnotations()
{
if (!pageDictionary.TryGet(NameToken.Annots, out IToken annotationsToken) ||
!DirectObjectFinder.TryGet(annotationsToken, tokenScanner, out ArrayToken annotationsArray))
{
yield break;
}
foreach (var token in annotationsArray.Data)
{
if (!DirectObjectFinder.TryGet(token, tokenScanner, out DictionaryToken annotationDictionary))
{
if (isLenientParsing)
{
continue;
}
throw new PdfDocumentFormatException($"The annotations dictionary contained an annotation which wasn't a dictionary: {token}.");
}
if (!isLenientParsing && annotationDictionary.TryGet(NameToken.Type, out NameToken dictionaryType))
{
if (dictionaryType != NameToken.Annot)
{
throw new PdfDocumentFormatException($"The annotations dictionary contained a non-annotation type dictionary: {annotationDictionary}.");
}
}
var type = annotationDictionary.Get <NameToken>(NameToken.Subtype, tokenScanner);
var annotationType = type.ToAnnotationType();
var rectangle = annotationDictionary.Get <ArrayToken>(NameToken.Rect, tokenScanner).ToRectangle(tokenScanner);
var contents = GetNamedString(NameToken.Contents, annotationDictionary);
var name = GetNamedString(NameToken.Nm, annotationDictionary);
var modifiedDate = GetNamedString(NameToken.M, annotationDictionary);
var flags = (AnnotationFlags)0;
if (annotationDictionary.TryGet(NameToken.F, out var flagsToken) && DirectObjectFinder.TryGet(flagsToken, tokenScanner, out NumericToken flagsNumericToken))
{
flags = (AnnotationFlags)flagsNumericToken.Int;
}
var border = AnnotationBorder.Default;
if (annotationDictionary.TryGet(NameToken.Border, out var borderToken) && DirectObjectFinder.TryGet(borderToken, tokenScanner, out ArrayToken borderArray) &&
borderArray.Length >= 3)
{
var horizontal = borderArray.GetNumeric(0).Data;
var vertical = borderArray.GetNumeric(1).Data;
var width = borderArray.GetNumeric(2).Data;
var dashes = default(IReadOnlyList <decimal>);
if (borderArray.Length == 4 && borderArray.Data[4] is ArrayToken dashArray)
{
dashes = dashArray.Data.OfType <NumericToken>().Select(x => x.Data).ToList();
}
border = new AnnotationBorder(horizontal, vertical, width, dashes);
}
var quadPointRectangles = new List <QuadPointsQuadrilateral>();
if (annotationDictionary.TryGet(NameToken.Quadpoints, tokenScanner, out ArrayToken quadPointsArray))
{
var values = new List <decimal>();
for (var i = 0; i < quadPointsArray.Length; i++)
{
if (!(quadPointsArray[i] is NumericToken value))
{
continue;
}
values.Add(value.Data);
if (values.Count == 8)
{
quadPointRectangles.Add(new QuadPointsQuadrilateral(new[]
{
new PdfPoint(values[0], values[1]),
new PdfPoint(values[2], values[3]),
new PdfPoint(values[4], values[5]),
new PdfPoint(values[6], values[7])
}));
values.Clear();
}
}
}
yield return(new Annotation(annotationDictionary, annotationType, rectangle, contents, name, modifiedDate, flags, border,
quadPointRectangles));
}
}
public IFont Generate(DictionaryToken dictionary, bool isLenientParsing)
{
var usingStandard14Only = !dictionary.ContainsKey(NameToken.FirstChar) || !dictionary.ContainsKey(NameToken.Widths);
if (usingStandard14Only)
{
// TODO: some fonts combine standard 14 font with other metrics.
if (!dictionary.TryGet(NameToken.BaseFont, out var baseFontToken) ||
!(baseFontToken is NameToken standard14Name))
{
throw new InvalidFontFormatException($"The Type 1 font did not contain a first character entry but also did not reference a standard 14 font: {dictionary}");
}
var metrics = Standard14.GetAdobeFontMetrics(standard14Name.Data);
return(new Type1Standard14Font(metrics));
}
var firstCharacter = FontDictionaryAccessHelper.GetFirstCharacter(dictionary);
var lastCharacter = FontDictionaryAccessHelper.GetLastCharacter(dictionary);
var widths = FontDictionaryAccessHelper.GetWidths(pdfScanner, dictionary, isLenientParsing);
if (!dictionary.TryGet(NameToken.FontDescriptor, out var _))
{
if (dictionary.TryGet(NameToken.BaseFont, out var baseFontToken) &&
DirectObjectFinder.TryGet(baseFontToken, pdfScanner, out NameToken baseFontName))
{
var metrics = Standard14.GetAdobeFontMetrics(baseFontName.Data);
var overrideEncoding = encodingReader.Read(dictionary, isLenientParsing);
return(new Type1Standard14Font(metrics, overrideEncoding));
}
}
var descriptor = FontDictionaryAccessHelper.GetFontDescriptor(pdfScanner, fontDescriptorFactory, dictionary, isLenientParsing);
var font = ParseFontProgram(descriptor, isLenientParsing);
var name = FontDictionaryAccessHelper.GetName(pdfScanner, dictionary, descriptor, isLenientParsing);
CMap toUnicodeCMap = null;
if (dictionary.TryGet(NameToken.ToUnicode, out var toUnicodeObj))
{
var toUnicode = DirectObjectFinder.Get <StreamToken>(toUnicodeObj, pdfScanner);
var decodedUnicodeCMap = toUnicode?.Decode(filterProvider);
if (decodedUnicodeCMap != null)
{
toUnicodeCMap = cMapCache.Parse(new ByteArrayInputBytes(decodedUnicodeCMap), isLenientParsing);
}
}
Encoding fromFont = null;
font?.Match(x => fromFont = x.Encoding != null ? new BuiltInEncoding(x.Encoding) : default(Encoding), x =>
{
if (x.Fonts != null && x.Fonts.Count > 0)
{
fromFont = x.Fonts.First().Value.Encoding;
}
});
Encoding encoding = encodingReader.Read(dictionary, isLenientParsing, descriptor, fromFont);
if (encoding == null)
{
font?.Match(x => encoding = new BuiltInEncoding(x.Encoding), _ => {});
}
return(new Type1FontSimple(name, firstCharacter, lastCharacter, widths, descriptor, encoding, toUnicodeCMap, font));
}
public AcroForm GetAcroForm(Catalog catalog)
{
if (!catalog.CatalogDictionary.TryGet(NameToken.AcroForm, out var acroRawToken))
{
return(null);
}
if (!DirectObjectFinder.TryGet(acroRawToken, tokenScanner, out DictionaryToken acroDictionary))
{
var fieldsRefs = new List <IndirectReferenceToken>();
// Invalid reference, try constructing the form from a Brute Force scan.
foreach (var reference in crossReferenceTable.ObjectOffsets.Keys)
{
var referenceToken = new IndirectReferenceToken(reference);
if (!DirectObjectFinder.TryGet(referenceToken, tokenScanner, out DictionaryToken dict))
{
continue;
}
if (dict.TryGet(NameToken.Kids, tokenScanner, out ArrayToken _) && dict.TryGet(NameToken.T, tokenScanner, out StringToken _))
{
fieldsRefs.Add(referenceToken);
}
}
if (fieldsRefs.Count == 0)
{
return(null);
}
acroDictionary = new DictionaryToken(new Dictionary <NameToken, IToken>
{
{ NameToken.Fields, new ArrayToken(fieldsRefs) }
});
}
var signatureFlags = (SignatureFlags)0;
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.SigFlags, tokenScanner, out NumericToken signatureToken))
{
signatureFlags = (SignatureFlags)signatureToken.Int;
}
var needAppearances = false;
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.NeedAppearances, tokenScanner, out BooleanToken appearancesToken))
{
needAppearances = appearancesToken.Data;
}
var calculationOrder = default(ArrayToken);
acroDictionary.TryGetOptionalTokenDirect(NameToken.Co, tokenScanner, out calculationOrder);
var formResources = default(DictionaryToken);
acroDictionary.TryGetOptionalTokenDirect(NameToken.Dr, tokenScanner, out formResources);
var da = default(string);
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Da, tokenScanner, out StringToken daToken))
{
da = daToken.Data;
}
else if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Da, tokenScanner, out HexToken daHexToken))
{
da = daHexToken.Data;
}
var q = default(int?);
if (acroDictionary.TryGetOptionalTokenDirect(NameToken.Q, tokenScanner, out NumericToken qToken))
{
q = qToken.Int;
}
if (!acroDictionary.TryGet(NameToken.Fields, tokenScanner, out ArrayToken fieldsArray))
{
return(null);
}
var fields = new Dictionary <IndirectReference, AcroFieldBase>(fieldsArray.Length);
foreach (var fieldToken in fieldsArray.Data)
{
if (!(fieldToken is IndirectReferenceToken fieldReferenceToken))
{
throw new PdfDocumentFormatException($"The fields array should only contain indirect references, instead got: {fieldToken}.");
}
var fieldDictionary = DirectObjectFinder.Get <DictionaryToken>(fieldToken, tokenScanner);
var field = GetAcroField(fieldDictionary, catalog, new List <DictionaryToken>(0));
fields[fieldReferenceToken.Data] = field;
}
return(new AcroForm(acroDictionary, signatureFlags, needAppearances, fields));
}
public Page Create(int number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers,
bool isLenientParsing)
{
if (dictionary == null)
{
throw new ArgumentNullException(nameof(dictionary));
}
var type = dictionary.GetNameOrDefault(NameToken.Type);
if (type != null && !type.Equals(NameToken.Page) && !isLenientParsing)
{
throw new InvalidOperationException($"Page {number} had its type specified as {type} rather than 'Page'.");
}
var rotation = new PageRotationDegrees(pageTreeMembers.Rotation);
if (dictionary.TryGet(NameToken.Rotate, pdfScanner, out NumericToken rotateToken))
{
rotation = new PageRotationDegrees(rotateToken.Int);
}
MediaBox mediaBox = GetMediaBox(number, dictionary, pageTreeMembers);
CropBox cropBox = GetCropBox(dictionary, pageTreeMembers, mediaBox);
var stackDepth = 0;
while (pageTreeMembers.ParentResources.Count > 0)
{
var resource = pageTreeMembers.ParentResources.Dequeue();
resourceStore.LoadResourceDictionary(resource, isLenientParsing);
stackDepth++;
}
if (dictionary.TryGet(NameToken.Resources, pdfScanner, out DictionaryToken resources))
{
resourceStore.LoadResourceDictionary(resources, isLenientParsing);
stackDepth++;
}
UserSpaceUnit userSpaceUnit = GetUserSpaceUnits(dictionary);
PageContent content = default(PageContent);
if (!dictionary.TryGet(NameToken.Contents, out var contents))
{
// ignored for now, is it possible? check the spec...
}
else if (DirectObjectFinder.TryGet <ArrayToken>(contents, pdfScanner, out var array))
{
var bytes = new List <byte>();
for (var i = 0; i < array.Data.Count; i++)
{
var item = array.Data[i];
if (!(item is IndirectReferenceToken obj))
{
throw new PdfDocumentFormatException($"The contents contained something which was not an indirect reference: {item}.");
}
var contentStream = DirectObjectFinder.Get <StreamToken>(obj, pdfScanner);
if (contentStream == null)
{
throw new InvalidOperationException($"Could not find the contents for object {obj}.");
}
bytes.AddRange(contentStream.Decode(filterProvider));
if (i < array.Data.Count - 1)
{
bytes.Add((byte)'\n');
}
}
content = GetContent(number, bytes, cropBox, userSpaceUnit, rotation, isLenientParsing);
}
else
{
var contentStream = DirectObjectFinder.Get <StreamToken>(contents, pdfScanner);
if (contentStream == null)
{
throw new InvalidOperationException("Failed to parse the content for the page: " + number);
}
var bytes = contentStream.Decode(filterProvider);
content = GetContent(number, bytes, cropBox, userSpaceUnit, rotation, isLenientParsing);
}
var page = new Page(number, dictionary, mediaBox, cropBox, rotation, content,
new AnnotationProvider(pdfScanner, dictionary, isLenientParsing),
pdfScanner);
for (var i = 0; i < stackDepth; i++)
{
resourceStore.UnloadResourceDictionary();
}
return(page);
}
public static ColorSpaceDetails GetColorSpaceDetails(ColorSpace?colorSpace,
DictionaryToken imageDictionary,
IPdfTokenScanner scanner,
IResourceStore resourceStore,
ILookupFilterProvider filterProvider,
bool cannotRecurse = false)
{
if (!colorSpace.HasValue)
{
return(UnsupportedColorSpaceDetails.Instance);
}
switch (colorSpace.Value)
{
case ColorSpace.DeviceGray:
return(DeviceGrayColorSpaceDetails.Instance);
case ColorSpace.DeviceRGB:
return(DeviceRgbColorSpaceDetails.Instance);
case ColorSpace.DeviceCMYK:
return(DeviceCmykColorSpaceDetails.Instance);
case ColorSpace.CalGray:
return(UnsupportedColorSpaceDetails.Instance);
case ColorSpace.CalRGB:
return(UnsupportedColorSpaceDetails.Instance);
case ColorSpace.Lab:
return(UnsupportedColorSpaceDetails.Instance);
case ColorSpace.ICCBased:
return(UnsupportedColorSpaceDetails.Instance);
case ColorSpace.Indexed:
{
if (cannotRecurse)
{
return(UnsupportedColorSpaceDetails.Instance);
}
if (!imageDictionary.TryGet(NameToken.ColorSpace, scanner, out ArrayToken colorSpaceArray) ||
colorSpaceArray.Length != 4)
{
// Error instead?
return(UnsupportedColorSpaceDetails.Instance);
}
var first = colorSpaceArray[0] as NameToken;
if (first == null || !ColorSpaceMapper.TryMap(first, resourceStore, out var innerColorSpace) ||
innerColorSpace != ColorSpace.Indexed)
{
return(UnsupportedColorSpaceDetails.Instance);
}
var second = colorSpaceArray[1];
ColorSpaceDetails baseDetails;
if (DirectObjectFinder.TryGet(second, scanner, out NameToken baseColorSpaceNameToken) &&
ColorSpaceMapper.TryMap(baseColorSpaceNameToken, resourceStore, out var baseColorSpaceName))
{
baseDetails = GetColorSpaceDetails(
baseColorSpaceName,
imageDictionary,
scanner,
resourceStore,
filterProvider,
true);
}
else if (DirectObjectFinder.TryGet(second, scanner, out ArrayToken baseColorSpaceArrayToken) &&
baseColorSpaceArrayToken.Length > 0 && baseColorSpaceArrayToken[0] is NameToken baseColorSpaceArrayNameToken &&
ColorSpaceMapper.TryMap(baseColorSpaceArrayNameToken, resourceStore, out var baseColorSpaceArrayColorSpace))
{
var pseudoImageDictionary = new DictionaryToken(
new Dictionary <NameToken, IToken>
{
{ NameToken.ColorSpace, baseColorSpaceArrayToken }
});
baseDetails = GetColorSpaceDetails(
baseColorSpaceArrayColorSpace,
pseudoImageDictionary,
scanner,
resourceStore,
filterProvider,
true);
}