private AcroFieldBase GetTextField(DictionaryToken fieldDictionary, NameToken fieldType, uint fieldFlags,
AcroFieldCommonInformation information,
int?pageNumber,
PdfRectangle?bounds)
{
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,
pageNumber,
bounds);
return(field);
}
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));
}
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);
}
