[Poppler-bugs] [Bug 81760] pdftops sometimes creates huge PS 3 files out of small PDFs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81760

William Bader <williambader at hotmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |williambader at hotmail.com

--- Comment #8 from William Bader <williambader at hotmail.com> ---
Created attachment 121480
  --> https://bugs.freedesktop.org/attachment.cgi?id=121480&action=edit
Patch to add LZW compression based on xpdf-3.04

This patch adds support for LZW compression using the code from xpdf-3.04.
xpdf had a psLZW flag in GlobalParams. I changed it to enableLZW in PSOutput.
In Stream.cc, xpdf used getBlock(buf, len) in LZWEncoder. I updated it to
doGetChars(len, buf).
$ ls -l tux-yellow.pdf 
-rw-r--r-- 1 william william 65720 Feb  2 19:58 tux-yellow.pdf
$ ./pdftops tux-yellow.pdf tux-with-lzw.ps
$ ./pdftops -nolzw tux-yellow.pdf tux-with-rle.ps
$ ls -l tux-with-lzw.ps tux-with-rle.ps 
-rw-rw-rw- 1 william william  1126352 Feb  3 06:31 tux-with-lzw.ps
-rw-rw-rw- 1 william william 27576756 Feb  3 06:31 tux-with-rle.ps
I also added a few other small changes from xpdf-3.04.

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