/* Updates the /ByteRange with the provided value */
private void UpdateByteRange(PdfPKCS7 pkcs7, PdfSignature signature)
{
PdfArray b = signature.GetByteRange();
RandomAccessFileOrArray rf = document.GetReader().GetSafeFile();
Stream rg = null;
try {
rg = new RASInputStream(new RandomAccessSourceFactory().CreateRanged(rf.CreateSourceView(), b.ToLongArray(
)));
byte[] buf = new byte[8192];
int rd;
while ((rd = rg.JRead(buf, 0, buf.Length)) > 0)
{
pkcs7.Update(buf, 0, rd);
}
}
catch (Exception e) {
throw new PdfException(e);
}
finally {
try {
if (rg != null)
{
rg.Dispose();
}
}
catch (System.IO.IOException e) {
// this really shouldn't ever happen - the source view we use is based on a Safe view, which is a no-op anyway
throw new PdfException(e);
}
}
}
/// <summary>Extracts a revision from the document.</summary>
/// <param name="field">the signature field name</param>
/// <returns>an InputStream covering the revision. Returns null if it's not a signature field</returns>
/// <exception cref="System.IO.IOException"/>
public virtual Stream ExtractRevision(String field)
{
GetSignatureNames();
if (!sigNames.ContainsKey(field))
{
return(null);
}
int length = sigNames.Get(field)[0];
RandomAccessFileOrArray raf = document.GetReader().GetSafeFile();
return(new RASInputStream(new WindowRandomAccessSource(raf.CreateSourceView(), 0, length)));
}
