[Djvu-gsdjvu] Building gsdvju (djvudigital) on MinGW

[deb <ot...@hu...>]

I see this is very low freq list (1 mail in last 7 years?), but hopefully this
message will not be in vain, as DjVu driver gives so good results. I also have
impression that very few people know about it.

"gsdjvu-1.5.tar.gz" can't be compiled with suggested GhostScript version on MinGW,
but with latest version it can (at time of writing 9.06). This way GS
interpreter still won't accept PDF input and pipes won't work. For fixing
pipes this patch is needed: 

  http://ghostscript.com/pipermail/gs-devel/2013-January/009382.html

Here is explicitly:
================================================================================
diff --git a/gs/psi/gs.c b/gs/psi/gs.c
index 530303b..3484654 100644
--- a/gs/psi/gs.c
+++ b/gs/psi/gs.c
@@ -62,6 +62,9 @@ commit_stack_pages( void )
 }
 #endif
 
+#include <stdio.h>
+#include <fcntl.h>
+
 int
 main(int argc, char *argv[])
 {
@@ -73,6 +76,9 @@ main(int argc, char *argv[])
     commit_stack_pages();
 #endif
     exit_status = 0;
+setmode(STDIN_FILENO, O_BINARY);
+setmode(STDOUT_FILENO, O_BINARY);
+setmode(STDERR_FILENO, O_BINARY);
 
     /*
      * Call setlocale(LC_CTYPE), so that we can convert PDF passwords
================================================================================

Afterwhich "Makefile.in" from GS base folder needs to be copied in parent, or if
user is in GS source top folder, this command will do it:

  cp base/Makefile.in .

That's all!

As mentioned PDF is not accepted as input for some reason but we can always pipe PS
from another GS instance. Here is minimal example batch file (for more proper
usage there is readme file in gsdjvu archive and djvudigital bash script):

================================================================================
gswin32c -sstdout=nul -dQUIET -dNOPAUSE -dBATCH -sDEVICE=ps2write -sOutputFile=- input.pdf ^
 | gsdjvu -sstdout=nul -dQUIET -dNOPAUSE -dBATCH -sDEVICE=djvusep -sOutputFile=- - ^
 | csepdjvu -v - output.djvu
================================================================================