OpenSystemsDevelopment / qpdf

Commit ab5a01c64ec3c8cb4f13b6846ca4ecdc7b888e14

Authored by Jay Berkenbilt
1 parent cd1e4661

notes 

git-svn-id: svn+q:///qpdf/trunk@986 71b93d88-0707-0410-a8cf-f5a4172ac649
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12 12 Stefan Heinsen <stefan.heinsen@gmx.de> in August, 2009. He seems
13 13 to like to send encrypted mail. (key 01FCC336)
14 14  
  15 + It appears that the only thing in the code that actually has to
  16 + change is the QPDF_Stream object. When replacing stream data, we
  17 + have to mutate the stream's dictionary to adjust /Filter,
  18 + /DecodeParms, and /Length. We should probably just provide a
  19 + method to replace the stream data, /Filter, and /DecodeParms all at
  20 + once. If new values are provided, then pipeStreamData can use the
  21 + new values, and we essentially then lose the original values. The
  22 + code for replacing stream data would be to use getStreamData to get
  23 + the old data and then to replace it all before any calls that would
  24 + cause QPDFWriter to write new stream data. Will have to go through
  25 + QPDF_Stream.cc carefully line by line to make sure everything is
  26 + adjusted properly.
  27 +
15 28 * Add helper routines for manipulating page content streams.
16 29 Operations should include ability to convert page contents from a
17 30 stream to an array of streams and to append or prepend to the page
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