Changeset 1622 for pykota/trunk/pykota/pdlanalyzer.py

Timestamp:

07/22/04 15:49:51 (20 years ago)

Author:

jalet

Message:

Added support for binary PostScript? through GhostScript? if native DSC
compliant PostScript? analyzer doesn't find any page. This is much
slower though, so native analyzer is tried first.

Files:

• pykota/trunk/pykota/pdlanalyzer.py (modified) (4 diffs)

pykota/trunk/pykota/pdlanalyzer.py

@@ -22 +22 @@
 #
 # $Log$
+# Revision 1.26  2004/07/22 13:49:51  jalet
+# Added support for binary PostScript through GhostScript if native DSC
+# compliant PostScript analyzer doesn't find any page. This is much
+# slower though, so native analyzer is tried first.
+#
 # Revision 1.25  2004/07/10 14:06:36  jalet
 # Fix for Python2.1 incompatibilities
@@ -108 +113 @@
 import tempfile
 import mmap
+import popen2
     
 KILOBYTE = 1024    
@@ -125 +131 @@
         """Initialize PostScript Analyzer."""
         self.infile = infile
-        
-    def getJobSize(self) :    
+       
+    def throughGhostScript(self) :
+        """Get the count through GhostScript, useful for non-DSC compliant PS files."""
+        self.infile.seek(0)
+        command = 'gs -sDEVICE=bbox -dNOPAUSE -dBATCH -dQUIET - 2>&1 | grep -c "%%HiResBoundingBox:" 2>/dev/null'
+        child = popen2.Popen4(command)
+        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, "Problem during analysis of Binary PostScript document."
+            
+        pagecount = 0
+        try :
+            pagecount = int(child.fromchild.readline().strip())
+        except (IOError, OSError, AttributeError, ValueError) :
+            raise PDLAnalyzerError, "Problem during analysis of Binary PostScript document."
+        child.fromchild.close()
+        
+        try :
+            retcode = child.wait()
+        except OSError, msg :    
+            raise PDLAnalyzerError, "Problem during analysis of Binary PostScript document."
+        return pagecount
+        
+    def natively(self) :
         """Count pages in a DSC compliant PostScript document."""
+        self.infile.seek(0)
         pagecount = 0
         for line in self.infile.xreadlines() : 
@@ -133 +168 @@
                 pagecount += 1
         return pagecount
+        
+    def getJobSize(self) :    
+        """Count pages in PostScript document."""
+        return self.natively() or self.throughGhostScript()
         
 class PDFAnalyzer :