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 2 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, write to the Free Software |
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17 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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18 | # |
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19 | # $Id$ |
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20 | # |
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21 | |
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22 | """This module defines the base class for all Page Description Language parsers.""" |
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23 | |
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24 | import sys |
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25 | import os |
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26 | import popen2 |
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27 | |
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28 | KILOBYTE = 1024 |
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29 | MEGABYTE = 1024 * KILOBYTE |
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30 | FIRSTBLOCKSIZE = 16 * KILOBYTE |
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31 | LASTBLOCKSIZE = int(KILOBYTE / 4) |
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32 | |
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33 | class PDLParserError(Exception): |
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34 | """An exception for PDLParser related stuff.""" |
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35 | def __init__(self, message = ""): |
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36 | self.message = message |
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37 | Exception.__init__(self, message) |
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38 | def __repr__(self): |
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39 | return self.message |
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40 | __str__ = __repr__ |
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41 | |
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42 | class PDLParser : |
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43 | """Generic PDL parser.""" |
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44 | totiffcommands = None # Default command to convert to TIFF |
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45 | def __init__(self, infile, debug=0, firstblock=None, lastblock=None) : |
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46 | """Initialize the generic parser.""" |
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47 | self.infile = infile |
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48 | self.debug = debug |
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49 | if firstblock is None : |
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50 | self.infile.seek(0) |
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51 | firstblock = self.infile.read(FIRSTBLOCKSIZE) |
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52 | try : |
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53 | self.infile.seek(-LASTBLOCKSIZE, 2) |
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54 | lastblock = self.infile.read(LASTBLOCKSIZE) |
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55 | except IOError : |
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56 | lastblock = "" |
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57 | self.infile.seek(0) |
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58 | self.firstblock = firstblock |
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59 | self.lastblock = lastblock |
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60 | if not self.isValid() : |
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61 | raise PDLParserError, "Invalid file format !" |
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62 | try : |
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63 | import psyco |
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64 | except ImportError : |
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65 | pass # Psyco is not installed |
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66 | else : |
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67 | # Psyco is installed, tell it to compile |
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68 | # the CPU intensive methods : PCL and PCLXL |
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69 | # parsing will greatly benefit from this. |
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70 | psyco.bind(self.getJobSize) |
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71 | |
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72 | def logdebug(self, message) : |
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73 | """Logs a debug message if needed.""" |
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74 | if self.debug : |
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75 | sys.stderr.write("%s\n" % message) |
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76 | |
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77 | def isValid(self) : |
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78 | """Returns True if data is in the expected format, else False.""" |
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79 | raise RuntimeError, "Not implemented !" |
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80 | |
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81 | def getJobSize(self) : |
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82 | """Counts pages in a document.""" |
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83 | raise RuntimeError, "Not implemented !" |
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84 | |
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85 | def convertToTiffMultiPage24NC(self, fname, dpi) : |
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86 | """Converts the input file to TIFF format, X dpi, 24 bits per pixel, uncompressed. |
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87 | Writes TIFF datas to the file named by fname. |
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88 | """ |
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89 | if self.totiffcommands : |
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90 | for totiffcommand in self.totiffcommands : |
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91 | self.infile.seek(0) |
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92 | error = False |
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93 | commandline = totiffcommand % locals() |
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94 | child = popen2.Popen4(commandline) |
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95 | try : |
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96 | try : |
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97 | data = self.infile.read(MEGABYTE) |
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98 | while data : |
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99 | child.tochild.write(data) |
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100 | child.tochild.flush() |
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101 | data = self.infile.read(MEGABYTE) |
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102 | except (IOError, OSError) : |
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103 | error = True |
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104 | finally : |
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105 | child.tochild.close() |
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106 | dummy = child.fromchild.read() |
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107 | child.fromchild.close() |
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108 | |
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109 | try : |
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110 | status = child.wait() |
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111 | except OSError : |
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112 | error = True |
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113 | else : |
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114 | if os.WIFEXITED(status) : |
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115 | if os.WEXITSTATUS(status) : |
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116 | error = True |
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117 | else : |
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118 | error = True |
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119 | |
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120 | if not os.path.exists(fname) : |
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121 | error = True |
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122 | elif not os.stat(fname).st_size : |
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123 | error = True |
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124 | else : |
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125 | break # Conversion worked fine it seems. |
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126 | self.logdebug("Command failed : %s" % repr(commandline)) |
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127 | if error : |
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128 | raise PDLParserError, "Problem during conversion to TIFF." |
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129 | else : |
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130 | raise PDLParserError, "Impossible to compute ink coverage for this file format." |
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131 | |
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132 | def test(parserclass) : |
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133 | """Test function.""" |
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134 | if (len(sys.argv) < 2) or ((not sys.stdin.isatty()) and ("-" not in sys.argv[1:])) : |
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135 | sys.argv.append("-") |
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136 | totalsize = 0 |
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137 | for arg in sys.argv[1:] : |
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138 | if arg == "-" : |
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139 | infile = sys.stdin |
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140 | mustclose = 0 |
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141 | else : |
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142 | infile = open(arg, "rbU") |
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143 | mustclose = 1 |
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144 | try : |
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145 | parser = parserclass(infile, debug=1) |
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146 | totalsize += parser.getJobSize() |
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147 | except PDLParserError, msg : |
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148 | sys.stderr.write("ERROR: %s\n" % msg) |
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149 | sys.stderr.flush() |
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150 | if mustclose : |
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151 | infile.close() |
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152 | print "%s" % totalsize |
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153 | |
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