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Overload OpenPdfFile method to support a Stream #1

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Overload OpenPdfFile method to support a Stream #1

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147 changes: 88 additions & 59 deletions PdfFileAnalyzer/PdfFileAnalyzer/PdfReader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@
// Version 1.3 2015/04/02
// Fix a problem related to unimplemented compression filters.
// Version 2.0 2019/06/06
// Change the software to a solution with two projecs.
// Change the software to a solution with two projects.
// A reader library and a test program.
// Version 2.1 2019/06/19
// Minor corrections to display software
Expand Down Expand Up @@ -197,90 +197,119 @@ int Position
/// <returns>Success or failure to decrypt file</returns>
public bool OpenPdfFile
(
string FileName,
string FileName,
string Password = null
)
{
// extension must be .pdf
if(!FileName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
throw new ArgumentException("PDF file must have .pdf extension");
// extension must be .pdf
if (!FileName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
throw new ArgumentException("PDF file must have .pdf extension");

// make sure file exist
if(!File.Exists(FileName)) throw new ArgumentException("PDF file does not exist");
// make sure file exist
if (!File.Exists(FileName)) throw new ArgumentException("PDF file does not exist");

// save file name
this.FileName = FileName;
// save file name
this.FileName = FileName;

// safe file name is a name with no path
SafeFileName = FileName.Substring(FileName.LastIndexOf('\\') + 1);
// safe file name is a name with no path
SafeFileName = FileName.Substring(FileName.LastIndexOf('\\') + 1);

// open pdf file for reading
PdfBinaryReader = new BinaryReader(new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read), Encoding.UTF8);
// Open PDF file for reading
PdfBinaryReader = new BinaryReader(new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read), Encoding.UTF8);

// create parse file object
ParseFile = new PdfFileParser(this);
return OpendPdfFile(Password);
}

////////////////////////////////////////////////////////////////////
// Read PDF file
////////////////////////////////////////////////////////////////////
/// <summary>
/// Open PDF file for reading
/// </summary>
/// <param name="FileContent">Content of the file.</param>
/// <param name="Password">The password.</param>
/// <returns></returns>
public bool OpenPdfFile
(
Stream FileContent,
string Password = null
)
{
// Open PDF file for reading
PdfBinaryReader = new BinaryReader(FileContent, Encoding.UTF8);

return OpendPdfFile(Password);
}

// validate file and read cross reference table
ValidateFile();
private bool OpendPdfFile
(
string Password = null
)
{
// create parse file object
ParseFile = new PdfFileParser(this);

// search for document ID
PdfBase TempIDArray = TrailerDict.FindValue("/ID");
if(TempIDArray.IsArray)
// validate file and read cross reference table
ValidateFile();

// search for document ID
PdfBase TempIDArray = TrailerDict.FindValue("/ID");
if (TempIDArray.IsArray)
{
// document ID is an array of two ids. Normally the two are the same
PdfBase[] IDArray = ((PdfArray) TempIDArray).ArrayItems;
// document ID is an array of two ids. Normally the two are the same
PdfBase[] IDArray = ((PdfArray)TempIDArray).ArrayItems;

// take the firat as the id for encryption
if(IDArray.Length > 0 && IDArray[0].IsPdfString) DocumentID = ((PdfString) IDArray[0]).StrValue;
// take the first as the id for encryption
if (IDArray.Length > 0 && IDArray[0].IsPdfString) DocumentID = ((PdfString)IDArray[0]).StrValue;
}

// search for /Encrypt
PdfBase TempEncryptionDict = TrailerDict.FindValue("/Encrypt");
// search for /Encrypt
PdfBase TempEncryptionDict = TrailerDict.FindValue("/Encrypt");

// document is not encrypted
if(TempEncryptionDict.IsEmpty)
{
// document is not encrypted
DecryptionStatus = DecryptionStatus.FileNotProtected;
if (TempEncryptionDict.IsEmpty)
{
// document is not encrypted
DecryptionStatus = DecryptionStatus.FileNotProtected;

// set reader active
SetReaderActive();
return true;
// set reader active
SetReaderActive();
return true;
}

// value is a reference
if(TempEncryptionDict.IsReference)
{
// get indirect object based on reference number
PdfIndirectObject ReaderObject = ToPdfIndirectObject((PdfReference) TempEncryptionDict);
// value is a reference
if (TempEncryptionDict.IsReference)
{
// get indirect object based on reference number
PdfIndirectObject ReaderObject = ToPdfIndirectObject((PdfReference)TempEncryptionDict);

// read object type
if(ReaderObject != null)
// read object type
if (ReaderObject != null)
{
ReaderObject.ReadObject();
if(ReaderObject.ObjectType == ObjectType.Dictionary)
ReaderObject.ReadObject();
if (ReaderObject.ObjectType == ObjectType.Dictionary)
{
ReaderObject._PdfObjectType = "/Encryption";
TempEncryptionDict = ReaderObject.Dictionary;
ReaderObject._PdfObjectType = "/Encryption";
TempEncryptionDict = ReaderObject.Dictionary;
}
}
}
if(!TempEncryptionDict.IsDictionary) throw new ApplicationException("Encryption dictionary is missing");
if (!TempEncryptionDict.IsDictionary) throw new ApplicationException("Encryption dictionary is missing");

// save encryption dictionary
EncryptionDict = (PdfDictionary) TempEncryptionDict;
// save encryption dictionary
EncryptionDict = (PdfDictionary)TempEncryptionDict;

// decryption is not possible without document ID
if(DocumentID == null) throw new ApplicationException("Encrypted document document ID is missing.");
// decryption is not possible without document ID
if (DocumentID == null) throw new ApplicationException("Encrypted document ID is missing.");

// encryption method is not supported by this library
if(!TestEncryptionSupport()) return false;
// encryption method is not supported by this library
if (!TestEncryptionSupport()) return false;

// try given password or default password
if(!TestPassword(Password)) return false;
// document was loaded succesfully
return true;
// try given password or default password
if (!TestPassword(Password)) return false;

// document was loaded successfully
return true;
}

/// <summary>
Expand Down Expand Up @@ -653,10 +682,10 @@ internal bool BuildPageArray
// we have a node of pages
if(Page.PdfObjectType == "/Pages")
{
// test for inheritence
// test for inheritance
// if the pages object dictionary has more than Type, Parent, Kids and Count
// entries, it is a case that the children has inherits some properties
// this application does not support inherited properities
// this application does not support inherited properties
if(Page.Dictionary.Count > 4) UnsupportedPageTree = true;

// recursive call for more pages
Expand Down Expand Up @@ -1125,7 +1154,7 @@ int XRefPos
int Width2 = ((PdfInteger) WArray[1]).IntValue;
int Width3 = ((PdfInteger) WArray[2]).IntValue;

// read and decomress the stream
// read and decompress the stream
byte[] ByteArray = XRefObj.ReadStream();
ByteArray = XRefObj.DecompressStream(ByteArray);

Expand Down