private AcroFieldBase GetAcroField(DictionaryToken fieldDictionary, Catalog catalog)
{
fieldDictionary.TryGet(NameToken.Ft, out NameToken fieldType);
fieldDictionary.TryGet(NameToken.Ff, out NumericToken fieldFlagsToken);
var kids = new List <DictionaryToken>();
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.Kids, tokenScanner, out ArrayToken kidsToken))
{
foreach (var kid in kidsToken.Data)
{
if (!(kid is IndirectReferenceToken kidReferenceToken))
{
throw new PdfDocumentFormatException($"AcroForm kids should only contain indirect reference, instead got: {kid}.");
}
var kidObject = tokenScanner.Get(kidReferenceToken.Data);
if (kidObject.Data is DictionaryToken kidDictionaryToken)
{
kids.Add(kidDictionaryToken);
}
else
{
throw new PdfDocumentFormatException($"Unexpected type of kid in AcroForm field. Expected dictionary but got: {kidObject.Data}.");
}
}
}
fieldDictionary.TryGetOptionalStringDirect(NameToken.T, tokenScanner, out var partialFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tu, tokenScanner, out var alternateFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tm, tokenScanner, out var mappingName);
fieldDictionary.TryGet(NameToken.Parent, out IndirectReferenceToken parentReferenceToken);
var information = new AcroFieldCommonInformation(parentReferenceToken?.Data, partialFieldName, alternateFieldName, mappingName);
int?pageNumber = null;
if (fieldDictionary.TryGet(NameToken.P, tokenScanner, out IndirectReferenceToken pageReference))
{
pageNumber = catalog.GetPageByReference(pageReference.Data)?.PageNumber;
}
PdfRectangle?bounds = null;
if (fieldDictionary.TryGet(NameToken.Rect, tokenScanner, out ArrayToken rectArray) && rectArray.Length == 4)
{
bounds = rectArray.ToRectangle();
}
var fieldFlags = (uint)(fieldFlagsToken?.Long ?? 0);
AcroFieldBase result;
if (fieldType == null)
{
var children = new List <AcroFieldBase>();
foreach (var kid in kids)
{
var kidField = GetAcroField(kid, catalog);
children.Add(kidField);
}
result = new AcroNonTerminalField(fieldDictionary, "Non-Terminal Field", fieldFlags, information, children);
}
else if (fieldType == NameToken.Btn)
{
var buttonFlags = (AcroButtonFieldFlags)fieldFlags;
if (buttonFlags.HasFlag(AcroButtonFieldFlags.Radio))
{
var field = new AcroRadioButtonsField(fieldDictionary, fieldType, buttonFlags, information,
pageNumber,
bounds);
result = field;
}
else if (buttonFlags.HasFlag(AcroButtonFieldFlags.PushButton))
{
var field = new AcroPushButtonField(fieldDictionary, fieldType, buttonFlags, information,
pageNumber,
bounds);
result = field;
}
else
{
var isChecked = false;
if (!fieldDictionary.TryGetOptionalTokenDirect(NameToken.V, tokenScanner, out NameToken valueToken))
{
valueToken = NameToken.Off;
}
else
{
isChecked = !string.Equals(valueToken.Data, NameToken.Off, StringComparison.OrdinalIgnoreCase);
}
var field = new AcroCheckboxField(fieldDictionary, fieldType, buttonFlags, information,
valueToken,
isChecked,
pageNumber,
bounds);
result = field;
}
}
else if (fieldType == NameToken.Tx)
{
result = GetTextField(fieldDictionary, fieldType, fieldFlags, information, pageNumber, bounds);
}
else if (fieldType == NameToken.Ch)
{
result = GetChoiceField(fieldDictionary, fieldType, fieldFlags, information,
pageNumber,
bounds);
}
else if (fieldType == NameToken.Sig)
{
var field = new AcroSignatureField(fieldDictionary, fieldType, fieldFlags, information,
pageNumber,
bounds);
result = field;
}
else
{
throw new PdfDocumentFormatException($"Unexpected type for field in AcroForm: {fieldType}.");
}
return(result);
}
private AcroFieldBase GetAcroField(DictionaryToken fieldDictionary, Catalog catalog,
IReadOnlyList <DictionaryToken> parentDictionaries)
{
var(combinedFieldDictionary, inheritsValue) = CreateInheritedDictionary(fieldDictionary, parentDictionaries);
fieldDictionary = combinedFieldDictionary;
fieldDictionary.TryGet(NameToken.Ft, tokenScanner, out NameToken fieldType);
fieldDictionary.TryGet(NameToken.Ff, tokenScanner, out NumericToken fieldFlagsToken);
var kids = new List <(bool hasParent, DictionaryToken dictionary)>();
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.Kids, tokenScanner, out ArrayToken kidsToken))
{
foreach (var kid in kidsToken.Data)
{
if (!(kid is IndirectReferenceToken kidReferenceToken))
{
throw new PdfDocumentFormatException($"AcroForm kids should only contain indirect reference, instead got: {kid}.");
}
var kidObject = tokenScanner.Get(kidReferenceToken.Data);
if (kidObject.Data is DictionaryToken kidDictionaryToken)
{
var hasParent = kidDictionaryToken.TryGet(NameToken.Parent, out IndirectReferenceToken _);
kids.Add((hasParent, kidDictionaryToken));
}
else
{
throw new PdfDocumentFormatException($"Unexpected type of kid in AcroForm field. Expected dictionary but got: {kidObject.Data}.");
}
}
}
fieldDictionary.TryGetOptionalStringDirect(NameToken.T, tokenScanner, out var partialFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tu, tokenScanner, out var alternateFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tm, tokenScanner, out var mappingName);
fieldDictionary.TryGet(NameToken.Parent, out IndirectReferenceToken parentReferenceToken);
var information = new AcroFieldCommonInformation(parentReferenceToken?.Data, partialFieldName, alternateFieldName, mappingName);
int?pageNumber = null;
if (fieldDictionary.TryGet(NameToken.P, tokenScanner, out IndirectReferenceToken pageReference))
{
pageNumber = catalog.GetPageByReference(pageReference.Data)?.PageNumber;
}
PdfRectangle?bounds = null;
if (fieldDictionary.TryGet(NameToken.Rect, tokenScanner, out ArrayToken rectArray) && rectArray.Length == 4)
{
bounds = rectArray.ToRectangle(tokenScanner);
}
var newParentDictionaries = new List <DictionaryToken>(parentDictionaries)
{
fieldDictionary
};
var children = new List <AcroFieldBase>(kids.Count);
foreach (var kid in kids)
{
if (!kid.hasParent)
{
// Is a widget annotation dictionary.
continue;
}
children.Add(GetAcroField(kid.dictionary, catalog, newParentDictionaries));
}
var fieldFlags = (uint)(fieldFlagsToken?.Long ?? 0);
AcroFieldBase result;
if (fieldType == null)
{
result = new AcroNonTerminalField(fieldDictionary, "Non-Terminal Field", fieldFlags, information, AcroFieldType.Unknown, children);
}
else if (fieldType == NameToken.Btn)
{
var buttonFlags = (AcroButtonFieldFlags)fieldFlags;
if (buttonFlags.HasFlag(AcroButtonFieldFlags.Radio))
{
if (children.Count > 0)
{
result = new AcroRadioButtonsField(fieldDictionary, fieldType, buttonFlags, information,
children);
}
else
{
var(isChecked, valueToken) = GetCheckedState(fieldDictionary, inheritsValue);
var field = new AcroRadioButtonField(fieldDictionary, fieldType, buttonFlags, information,
pageNumber,
bounds,
valueToken,
isChecked);
result = field;
}
}
else if (buttonFlags.HasFlag(AcroButtonFieldFlags.PushButton))
{
var field = new AcroPushButtonField(fieldDictionary, fieldType, buttonFlags, information,
pageNumber,
bounds);
result = field;
}
else
{
if (children.Count > 0)
{
result = new AcroCheckboxesField(fieldDictionary, fieldType, buttonFlags, information,
children);
}
else
{
var(isChecked, valueToken) = GetCheckedState(fieldDictionary, inheritsValue);
var field = new AcroCheckboxField(fieldDictionary, fieldType, buttonFlags, information,
valueToken,
isChecked,
pageNumber,
bounds);
result = field;
}
}
}
else if (fieldType == NameToken.Tx)
{
result = GetTextField(fieldDictionary, fieldType, fieldFlags, information, pageNumber, bounds);
}
else if (fieldType == NameToken.Ch)
{
result = GetChoiceField(fieldDictionary, fieldType, fieldFlags, information,
pageNumber,
bounds);
}
else if (fieldType == NameToken.Sig)
{
var field = new AcroSignatureField(fieldDictionary, fieldType, fieldFlags, information,
pageNumber,
bounds);
result = field;
}
else
{
throw new PdfDocumentFormatException($"Unexpected type for field in AcroForm: {fieldType}.");
}
return(result);
}
private AcroFieldBase GetAcroField(DictionaryToken fieldDictionary)
{
fieldDictionary.TryGet(NameToken.Ft, out NameToken fieldType);
fieldDictionary.TryGet(NameToken.Ff, out NumericToken fieldFlagsToken);
var kids = new List <DictionaryToken>();
if (fieldDictionary.TryGetOptionalTokenDirect(NameToken.Kids, tokenScanner, out ArrayToken kidsToken))
{
foreach (var kid in kidsToken.Data)
{
if (!(kid is IndirectReferenceToken kidReferenceToken))
{
throw new PdfDocumentFormatException($"AcroForm kids should only contain indirect reference, instead got: {kid}.");
}
var kidObject = tokenScanner.Get(kidReferenceToken.Data);
if (kidObject.Data is DictionaryToken kidDictionaryToken)
{
kids.Add(kidDictionaryToken);
}
else
{
throw new PdfDocumentFormatException($"Unexpected type of kid in AcroForm field. Expected dictionary but got: {kidObject.Data}.");
}
}
}
fieldDictionary.TryGetOptionalStringDirect(NameToken.T, tokenScanner, out var partialFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tu, tokenScanner, out var alternateFieldName);
fieldDictionary.TryGetOptionalStringDirect(NameToken.Tm, tokenScanner, out var mappingName);
fieldDictionary.TryGet(NameToken.Parent, out IndirectReferenceToken parentReferenceToken);
var information = new AcroFieldCommonInformation(parentReferenceToken?.Data, partialFieldName, alternateFieldName, mappingName);
var fieldFlags = (uint)(fieldFlagsToken?.Long ?? 0);
AcroFieldBase result;
if (fieldType == null)
{
var children = new List <AcroFieldBase>();
foreach (var kid in kids)
{
var kidField = GetAcroField(kid);
children.Add(kidField);
}
result = new NonTerminalAcroField(fieldDictionary, "Non-Terminal Field", fieldFlags, information, children);
}
else if (fieldType == NameToken.Btn)
{
var buttonFlags = (AcroButtonFieldFlags)fieldFlags;
if (buttonFlags.HasFlag(AcroButtonFieldFlags.Radio))
{
var field = new AcroRadioButtonsField(fieldDictionary, fieldType, buttonFlags, information);
result = field;
}
else if (buttonFlags.HasFlag(AcroButtonFieldFlags.PushButton))
{
var field = new AcroPushButtonField(fieldDictionary, fieldType, buttonFlags, information);
result = field;
}
else
{
if (!fieldDictionary.TryGetOptionalTokenDirect(NameToken.V, tokenScanner, out NameToken valueToken))
{
valueToken = NameToken.Off;
}
var field = new AcroCheckboxField(fieldDictionary, fieldType, buttonFlags, information, valueToken);
result = field;
}
}
else if (fieldType == NameToken.Tx)
{
result = GetTextField(fieldDictionary, fieldType, fieldFlags, information);
}
else if (fieldType == NameToken.Ch)
{
result = GetChoiceField(fieldDictionary, fieldType, fieldFlags, information);
}
else if (fieldType == NameToken.Sig)
{
var field = new AcroSignatureField(fieldDictionary, fieldType, fieldFlags, information);
result = field;
}
else
{
throw new PdfDocumentFormatException($"Unexpected type for field in AcroForm: {fieldType}.");
}
return(result);
}
