That's a good idea. I'll add that method or something similar.
Paulo
----- Original Message -----
From: "John Pruitt" <[EMAIL PROTECTED]>
To: "John Pruitt" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Wednesday, December 07, 2005 8:01 PM
Subject: Re: [iText-questions] Suggested improvement.
Possible solution:
Adding a getUnfilteredStreamBytes() method to PdfReader would allow users
to access a stream's bytes even if the stream's filter is not yet
supported by iText. This would allow a programmer to filter the stream
himself. The following is the method I added to my copy of iText to
implement the functionality.
public static byte[] getUnfilteredStreamBytes(PRStream stream,
RandomAccessFileOrArray
file)
throws IOException
{
PdfReader reader = stream.getReader();
byte[] b;
if (stream.getOffset() < 0)
{
b = stream.getBytes();
}
else
{
b = new byte[stream.getLength()];
file.seek(stream.getOffset());
file.readFully(b);
PdfEncryption decrypt = reader.getDecrypt();
if (decrypt != null)
{
decrypt.setHashKey(stream.getObjNum(), stream.getObjGen());
decrypt.prepareKey();
decrypt.encryptRC4(b);
}
}
return b;
}
John Pruitt wrote:
I am trying to get a CCITTFax encoded stream out of a pdf file.
PdfReader.getStreamBytes(PRStream stream) reads a byte stream from the
pdf file, decrypts the stream if neccessary, attempts to apply any
filters to the stream, and then returns the byte array. This would be
perfect for what I need to do, except that the method does not recognize
the /CCITTFaxDecode filter. The method throws an IOException: "The filter
/CCITTFaxDecode is not supported." While I understand why this method was
coded in this way, it makes it impossible for me to actually get to the
byte array for my CCITT data. If the method were to simply return the
unfiltered byte array in the case that it found a filter it did not
recognize, then the user would be able to apply the appropriate filter
manually. I have code to decode the CCITT data, but this method will not
let me get to the data.
The following code does actually get the byte stream from the file,
however my pdfs are encrypted and thus the byte array is encrypted. I am
unable to decrypt the stream manually because the PdfReader.getDecrypt()
is a private method.
RandomAccessFileOrArray rf = reader.getSafeFile();
rf.reOpen();
rf.seek(offset);
rf.readFully(encoded_data);
rf.close();
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