Thank you. I take it as a complement that you think it a good idea.
John
Paulo Soares wrote:
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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