Changeset 199 for pkpgcounter/trunk/pdlanalyzer/pdlparser.py

Timestamp:

04/04/05 13:59:39 (20 years ago)

Author:

jerome

Message:

More work done on moving stuff around

Files:

• pkpgcounter/trunk/pdlanalyzer/pdlparser.py (modified) (2 diffs)

pkpgcounter/trunk/pdlanalyzer/pdlparser.py

@@ -19 +19 @@
 # $Id$
 #
+
+import sys
+import tempfile
+
+from pdlanalyzer.postscript import PostScriptParser
+from pdlanalyzer.pdf import PDFParser
+from pdlanalyzer.pcl345 import PCL345Parser
+from pdlanalyzer.pclxl import PCLXLParser
+from pdlanalyzer.escp2 import ESCP2Parser
+
+KILOBYTE = 1024    
+MEGABYTE = 1024 * KILOBYTE    
+LASTBLOCKSIZE = int(KILOBYTE / 4)
 
 class PDLParserError(Exception):
@@ -39 +52 @@
         """Counts pages in the document."""
         raise RuntimeError, "Not implemented !"
+        
+class PDLAnalyzer :    
+    """Class for PDL autodetection."""
+    def __init__(self, filename, debug=0) :
+        """Initializes the PDL analyzer.
+        
+           filename is the name of the file or '-' for stdin.
+           filename can also be a file-like object which 
+           supports read() and seek().
+        """
+        self.debug = debug
+        self.filename = filename
+        try :
+            import psyco 
+        except ImportError :    
+            sys.stderr.write("pkpgcounter : you should install psyco if possible, this would greatly speedup parsing.\n")
+            pass # Psyco is not installed
+        else :    
+            # Psyco is installed, tell it to compile
+            # the CPU intensive methods : PCL and PCLXL
+            # parsing will greatly benefit from this, 
+            # for PostScript and PDF the difference is
+            # barely noticeable since they are already
+            # almost optimal, and much more speedy anyway.
+            psyco.bind(PostScriptParser.getJobSize)
+            psyco.bind(PDFParser.getJobSize)
+            psyco.bind(ESCP2Parser.getJobSize)
+            psyco.bind(PCLParser.getJobSize)
+            psyco.bind(PCLXLParser.getJobSize)
+        
+    def getJobSize(self) :    
+        """Returns the job's size."""
+        self.openFile()
+        try :
+            pdlhandler = self.detectPDLHandler()
+        except PDLParserError, msg :    
+            self.closeFile()
+            raise PDLParserError, "ERROR : Unknown file format for %s (%s)" % (self.filename, msg)
+        else :
+            try :
+                size = pdlhandler(self.infile, self.debug).getJobSize()
+            finally :    
+                self.closeFile()
+            return size
+        
+    def openFile(self) :    
+        """Opens the job's data stream for reading."""
+        self.mustclose = 0  # by default we don't want to close the file when finished
+        if hasattr(self.filename, "read") and hasattr(self.filename, "seek") :
+            # filename is in fact a file-like object 
+            infile = self.filename
+        elif self.filename == "-" :
+            # we must read from stdin
+            infile = sys.stdin
+        else :    
+            # normal file
+            self.infile = open(self.filename, "rb")
+            self.mustclose = 1
+            return
+            
+        # Use a temporary file, always seekable contrary to standard input.
+        self.infile = tempfile.TemporaryFile(mode="w+b")
+        while 1 :
+            data = infile.read(MEGABYTE) 
+            if not data :
+                break
+            self.infile.write(data)
+        self.infile.flush()    
+        self.infile.seek(0)
+            
+    def closeFile(self) :        
+        """Closes the job's data stream if we can close it."""
+        if self.mustclose :
+            self.infile.close()    
+        else :    
+            # if we don't have to close the file, then
+            # ensure the file pointer is reset to the 
+            # start of the file in case the process wants
+            # to read the file again.
+            try :
+                self.infile.seek(0)
+            except :    
+                pass    # probably stdin, which is not seekable
+        
+    def isPostScript(self, sdata, edata) :    
+        """Returns 1 if data is PostScript, else 0."""
+        if sdata.startswith("%!") or \
+           sdata.startswith("\004%!") or \
+           sdata.startswith("\033%-12345X%!PS") or \
+           ((sdata[:128].find("\033%-12345X") != -1) and \
+             ((sdata.find("LANGUAGE=POSTSCRIPT") != -1) or \
+              (sdata.find("LANGUAGE = POSTSCRIPT") != -1) or \
+              (sdata.find("LANGUAGE = Postscript") != -1))) or \
+              (sdata.find("%!PS-Adobe") != -1) :
+            if self.debug :  
+                sys.stderr.write("%s is a PostScript file\n" % str(self.filename))
+            return 1
+        else :    
+            return 0
+        
+    def isPDF(self, sdata, edata) :    
+        """Returns 1 if data is PDF, else 0."""
+        if sdata.startswith("%PDF-") or \
+           sdata.startswith("\033%-12345X%PDF-") or \
+           ((sdata[:128].find("\033%-12345X") != -1) and (sdata.upper().find("LANGUAGE=PDF") != -1)) or \
+           (sdata.find("%PDF-") != -1) :
+            if self.debug :  
+                sys.stderr.write("%s is a PDF file\n" % str(self.filename))
+            return 1
+        else :    
+            return 0
+        
+    def isPCL(self, sdata, edata) :    
+        """Returns 1 if data is PCL, else 0."""
+        if sdata.startswith("\033E\033") or \
+           (sdata.startswith("\033*rbC") and (not edata[-3:] == "\f\033@")) or \
+           sdata.startswith("\033%8\033") or \
+           (sdata.find("\033%-12345X") != -1) :
+            if self.debug :  
+                sys.stderr.write("%s is a PCL3/4/5 file\n" % str(self.filename))
+            return 1
+        else :    
+            return 0
+        
+    def isPCLXL(self, sdata, edata) :    
+        """Returns 1 if data is PCLXL aka PCL6, else 0."""
+        if ((sdata[:128].find("\033%-12345X") != -1) and \
+             (sdata.find(" HP-PCL XL;") != -1) and \
+             ((sdata.find("LANGUAGE=PCLXL") != -1) or \
+              (sdata.find("LANGUAGE = PCLXL") != -1))) :
+            if self.debug :  
+                sys.stderr.write("%s is a PCLXL (aka PCL6) file\n" % str(self.filename))
+            return 1
+        else :    
+            return 0
+            
+    def isESCP2(self, sdata, edata) :        
+        """Returns 1 if data is ESC/P2, else 0."""
+        if sdata.startswith("\033@") or \
+           sdata.startswith("\033*") or \
+           sdata.startswith("\n\033@") or \
+           sdata.startswith("\0\0\0\033\1@EJL") : # ESC/P Raster ??? Seen on Stylus Photo 1284
+            if self.debug :  
+                sys.stderr.write("%s is an ESC/P2 file\n" % str(self.filename))
+            return 1
+        else :    
+            return 0
+    
+    def detectPDLHandler(self) :    
+        """Tries to autodetect the document format.
+        
+           Returns the correct PDL handler class or None if format is unknown
+        """   
+        # Try to detect file type by reading first block of datas    
+        self.infile.seek(0)
+        firstblock = self.infile.read(4 * KILOBYTE)
+        try :
+            self.infile.seek(-LASTBLOCKSIZE, 2)
+            lastblock = self.infile.read(LASTBLOCKSIZE)
+        except IOError :    
+            lastblock = ""
+        self.infile.seek(0)
+        if self.isPostScript(firstblock, lastblock) :
+            return PostScriptParser
+        elif self.isPCLXL(firstblock, lastblock) :    
+            return PCLXLParser
+        elif self.isPDF(firstblock, lastblock) :    
+            return PDFParser
+        elif self.isPCL(firstblock, lastblock) :    
+            return PCLParser
+        elif self.isESCP2(firstblock, lastblock) :    
+            return ESCP2Parser
+        else :    
+            raise PDLParserError, "Analysis of first data block failed."
+            
+def main() :    
+    """Entry point for PDL Analyzer."""
+    if (len(sys.argv) < 2) or ((not sys.stdin.isatty()) and ("-" not in sys.argv[1:])) :
+        sys.argv.append("-")
+        
+    if ("-h" in sys.argv[1:]) or ("--help" in sys.argv[1:]) :
+        print "usage : pkpgcounter file1 file2 ... fileN"
+    elif ("-v" in sys.argv[1:]) or ("--version" in sys.argv[1:]) :
+        print "%s" % version.__version__
+    else :
+        totalsize = 0    
+        debug = 0
+        minindex = 1
+        if sys.argv[1] == "--debug" :
+            minindex = 2
+            debug = 1
+        for arg in sys.argv[minindex:] :
+            try :
+                parser = PDLAnalyzer(arg, debug)
+                totalsize += parser.getJobSize()
+            except PDLParserError, msg :    
+                sys.stderr.write("ERROR: %s\n" % msg)
+                sys.stderr.flush()
+        print "%s" % totalsize
+    
+if __name__ == "__main__" :    
+    main()