1 | # |
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2 | # pkpgcounter : a generic Page Description Language parser |
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3 | # |
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4 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
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5 | # This program is free software: you can redistribute it and/or modify |
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6 | # it under the terms of the GNU General Public License as published by |
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7 | # the Free Software Foundation, either version 3 of the License, or |
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8 | # (at your option) any later version. |
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9 | # |
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10 | # This program is distributed in the hope that it will be useful, |
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11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | # GNU General Public License for more details. |
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14 | # |
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15 | # You should have received a copy of the GNU General Public License |
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16 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 | # |
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18 | # $Id$ |
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19 | # |
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20 | |
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21 | """This module defines the base class for all Page Description Language parsers.""" |
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22 | |
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23 | import sys |
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24 | import os |
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25 | import popen2 |
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26 | |
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27 | KILOBYTE = 1024 |
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28 | MEGABYTE = 1024 * KILOBYTE |
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29 | FIRSTBLOCKSIZE = 16 * KILOBYTE |
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30 | LASTBLOCKSIZE = int(KILOBYTE / 4) |
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31 | |
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32 | class PDLParserError(Exception): |
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33 | """An exception for PDLParser related stuff.""" |
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34 | def __init__(self, message = ""): |
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35 | self.message = message |
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36 | Exception.__init__(self, message) |
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37 | def __repr__(self): |
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38 | return self.message |
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39 | __str__ = __repr__ |
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40 | |
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41 | class PDLParser : |
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42 | """Generic PDL parser.""" |
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43 | totiffcommands = None # Default command to convert to TIFF |
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44 | openmode = "rb" # Default file opening mode |
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45 | def __init__(self, filename, firstblock, lastblock, debug=0) : |
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46 | """Initialize the generic parser.""" |
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47 | self.filename = filename |
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48 | self.debug = debug |
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49 | self.infile = None |
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50 | (self.firstblock, self.lastblock) = (firstblock, lastblock) |
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51 | if not self.isValid() : |
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52 | raise PDLParserError, "Invalid file format !" |
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53 | try : |
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54 | import psyco |
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55 | except ImportError : |
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56 | pass # Psyco is not installed |
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57 | else : |
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58 | # Psyco is installed, tell it to compile |
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59 | # the CPU intensive methods : PCL and PCLXL |
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60 | # parsing will greatly benefit from this. |
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61 | psyco.bind(self.getJobSize) |
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62 | self.infile = open(self.filename, self.openmode) |
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63 | # self.logdebug("Opened %s in '%s' mode." % (self.filename, self.openmode)) |
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64 | |
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65 | def __del__(self) : |
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66 | """Ensures the input file gets closed.""" |
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67 | if self.infile : |
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68 | self.infile.close() |
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69 | |
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70 | def logdebug(self, message) : |
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71 | """Logs a debug message if needed.""" |
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72 | if self.debug : |
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73 | sys.stderr.write("%s\n" % message) |
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74 | |
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75 | def isValid(self) : |
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76 | """Returns True if data is in the expected format, else False.""" |
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77 | raise RuntimeError, "Not implemented !" |
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78 | |
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79 | def getJobSize(self) : |
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80 | """Counts pages in a document.""" |
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81 | raise RuntimeError, "Not implemented !" |
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82 | |
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83 | def convertToTiffMultiPage24NC(self, outfname, dpi) : |
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84 | """Converts the input file to TIFF format, X dpi, 24 bits per pixel, uncompressed. |
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85 | Writes TIFF datas to the file named by outfname. |
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86 | """ |
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87 | if self.totiffcommands : |
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88 | infname = self.filename |
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89 | for totiffcommand in self.totiffcommands : |
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90 | error = False |
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91 | commandline = totiffcommand % locals() |
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92 | # self.logdebug("Executing '%s'" % commandline) |
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93 | status = os.system(commandline) |
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94 | if os.WIFEXITED(status) : |
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95 | if os.WEXITSTATUS(status) : |
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96 | error = True |
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97 | else : |
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98 | error = True |
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99 | if not os.path.exists(outfname) : |
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100 | error = True |
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101 | elif not os.stat(outfname).st_size : |
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102 | error = True |
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103 | else : |
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104 | break # Conversion worked fine it seems. |
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105 | sys.stderr.write("Command failed : %s\n" % repr(commandline)) |
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106 | if error : |
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107 | raise PDLParserError, "Problem during conversion to TIFF." |
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108 | else : |
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109 | raise PDLParserError, "Impossible to compute ink coverage for this file format." |
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