Changeset 1547 for pykota/trunk

Timestamp:

06/18/04 16:00:16 (20 years ago)

Author:

jalet

Message:

Added PDF support in smart PDL analyzer (through GhostScript? for now)

Location:

pykota/trunk

Files:

• NEWS (modified) (1 diff)
• pykota/pdlanalyzer.py (modified) (5 diffs)

pykota/trunk/NEWS

@@ -24 +24 @@
     - 1.19alpha23 :
     
+        - Smart PDL analyzer now recognizes PDF too.
+        
         - All tracebacks now include PyKota's version number.
           

pykota/trunk/pykota/pdlanalyzer.py

@@ -22 +22 @@
 #
 # $Log$
+# Revision 1.6  2004/06/18 14:00:16  jalet
+# Added PDF support in smart PDL analyzer (through GhostScript for now)
+#
 # Revision 1.5  2004/06/18 10:09:05  jalet
 # Resets file pointer to start of file in all cases
@@ -41 +44 @@
 
 import sys
+import os
 import struct
 import tempfile
+import popen2
     
 KILOBYTE = 1024    
@@ -71 +76 @@
                 pagecount += 1
         return pagecount
+        
+class PDFAnalyzer :
+    def __init__(self, infile) :
+        """Initialize PDF Analyzer."""
+        self.infile = infile
+        
+    def getJobSize(self) :    
+        """Counts pages in a PDF document. TODO : don't use GhostScript in the future."""
+        MEGABYTE = 1024*1024
+        child = popen2.Popen4("gs -q -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pswrite -sOutputFile=- -c save pop -f - 2>/dev/null")
+        try :
+            data = self.infile.read(MEGABYTE)    
+            while data :
+                child.tochild.write(data)
+                data = self.infile.read(MEGABYTE)
+            child.tochild.flush()
+            child.tochild.close()    
+        except (IOError, OSError), msg :    
+            raise PDLAnalyzerError, "Unable to convert PDF input to PS with GhostScript : %s" % msg
+        
+        psanalyzer = PostScriptAnalyzer(child.fromchild)
+        pagecount = psanalyzer.getJobSize()
+        child.fromchild.close()
+        try :
+            retcode = child.wait()
+        except OSError, msg :    
+            self.filter.logger.log_message(_("Problem while waiting for PDF to PS converter (GhostScript pid %s) to exit : %s") % (child.pid, msg))
+        else :    
+            if os.WIFEXITED(retcode) :
+                status = os.WEXITSTATUS(retcode)
+            else :    
+                status = retcode
+            if status :    
+                raise PDLAnalyzerError, "PDF to PS converter (GhostScript pid %s) exit code is %s" % (child.pid, repr(status))
+        return pagecount    
         
 class PCLAnalyzer :
@@ -430 +470 @@
             return 0
         
+    def isPDF(self, data) :    
+        """Returns 1 if data is PDF, else 0."""
+        if data.startswith("%PDF-") or \
+           data.startswith("\033%-12345X%PDF-") or \
+           ((data[:128].find("\033%-12345X") != -1) and (data.upper().find("LANGUAGE=PDF") != -1)) or \
+           (data.find("%PDF-") != -1) :
+            return 1
+        else :    
+            return 0
+        
     def isPCL(self, data) :    
         """Returns 1 if data is PCL, else 0."""
@@ -466 +516 @@
         elif self.isPCL(firstblock) :    
             return PCLAnalyzer
+        elif self.isPDF(firstblock) :    
+            return PDFAnalyzer
         else :    
             raise PDLAnalyzerError, "Analysis of first data block failed."