1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | # |
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4 | # pkpgcounter : a generic Page Description Language parser |
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5 | # |
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6 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
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7 | # This program is free software: you can redistribute it and/or modify |
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8 | # it under the terms of the GNU General Public License as published by |
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9 | # the Free Software Foundation, either version 3 of the License, or |
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10 | # (at your option) any later version. |
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11 | # |
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12 | # This program is distributed in the hope that it will be useful, |
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | # GNU General Public License for more details. |
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16 | # |
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17 | # You should have received a copy of the GNU General Public License |
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18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 | # |
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20 | # $Id$ |
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21 | # |
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22 | |
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23 | """This modules implements a page counter for SPL1 documents.""" |
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24 | |
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25 | import os |
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26 | import mmap |
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27 | import struct |
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28 | |
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29 | import pdlparser |
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30 | import version |
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31 | |
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32 | ESCAPECHARS = (chr(0x1b), chr(0x24)) |
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33 | |
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34 | class Parser(pdlparser.PDLParser) : |
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35 | """A parser for SPL1 documents.""" |
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36 | format = "SPL1 (aka GDI)" |
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37 | def isValid(self) : |
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38 | """Returns True if data is SPL1, else False.""" |
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39 | if ((self.firstblock[:128].find("\033%-12345X") != -1) and \ |
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40 | (self.firstblock.find("$PJL ") != -1) and \ |
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41 | ((self.firstblock.find("LANGUAGE=SMART") != -1) or \ |
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42 | (self.firstblock.find("LANGUAGE = SMART") != -1))) : |
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43 | return True |
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44 | else : |
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45 | return False |
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46 | |
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47 | def littleEndian(self) : |
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48 | """Toggles to little endianness.""" |
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49 | self.unpackType = { 1 : "B", 2 : "<H", 4 : "<I" } |
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50 | self.unpackShort = self.unpackType[2] |
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51 | self.unpackLong = self.unpackType[4] |
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52 | # self.logdebug("Little Endian") |
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53 | return 0 |
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54 | |
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55 | def bigEndian(self) : |
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56 | """Toggles to big endianness.""" |
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57 | self.unpackType = { 1 : "B", 2 : ">H", 4 : ">I" } |
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58 | self.unpackShort = self.unpackType[2] |
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59 | self.unpackLong = self.unpackType[4] |
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60 | # self.logdebug("Big Endian") |
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61 | return 0 |
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62 | |
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63 | def escape(self, nextpos) : |
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64 | """Handles the ESC code.""" |
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65 | self.isbitmap = False |
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66 | pos = endpos = nextpos |
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67 | minfile = self.minfile |
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68 | if minfile[pos : pos+8] == r"%-12345X" : |
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69 | endpos = pos + 9 |
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70 | elif minfile[pos-1] in ESCAPECHARS : |
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71 | endpos = pos |
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72 | else : |
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73 | return 0 |
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74 | endmark = (chr(0x1b), chr(0x00)) |
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75 | asciilimit = chr(0x80) |
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76 | quotes = 0 |
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77 | while (minfile[endpos] not in endmark) and \ |
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78 | ((minfile[endpos] < asciilimit) or (quotes % 2)) : |
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79 | if minfile[endpos] == '"' : |
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80 | quotes += 1 |
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81 | endpos += 1 |
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82 | |
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83 | # Store this in a per page mapping. |
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84 | # NB : First time will be at page 0 (i.e. **before** page 1) ! |
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85 | stuff = self.escapedStuff.setdefault(self.pagecount, []) |
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86 | datas = minfile[pos-1 : endpos] |
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87 | stuff.append(datas) |
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88 | if datas.endswith("$PJL BITMAP START\r\n") : |
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89 | self.isbitmap = True |
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90 | # self.logdebug("New bitmap") |
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91 | self.logdebug("Escaped datas : [%s]" % repr(datas)) |
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92 | return endpos - pos + 1 |
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93 | |
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94 | def getJobSize(self) : |
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95 | """Counts pages in an SPL1 document. |
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96 | |
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97 | Algorithm by Jerome Alet. |
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98 | """ |
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99 | infileno = self.infile.fileno() |
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100 | self.minfile = minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED) |
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101 | self.pagecount = 0 |
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102 | self.escapedStuff = {} # For escaped datas, mostly PJL commands |
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103 | self.bigEndian() |
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104 | self.isbitmap = False |
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105 | pos = 0 |
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106 | unpack = struct.unpack |
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107 | try : |
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108 | try : |
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109 | while 1 : |
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110 | tag = minfile[pos] |
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111 | if tag in ESCAPECHARS : |
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112 | pos += self.escape(pos+1) |
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113 | else : |
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114 | if not self.isbitmap : |
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115 | raise pdlparser.PDLParserError, "Unfortunately SPL1 is incompletely recognized. Parsing aborted. Please report the problem to %s" % version.__authoremail__ |
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116 | (offset, |
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117 | seqnum) = unpack(">IH", minfile[pos:pos+6]) |
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118 | # self.logdebug("Offset : %i Sequence Number : %i" % (offset, seqnum)) |
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119 | if not seqnum : |
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120 | # Sequence number resets to 0 for each new page. |
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121 | self.pagecount += 1 |
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122 | pos += 4 + offset |
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123 | except struct.error, msg : |
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124 | raise pdlparser.PDLParserError, "Unfortunately SPL1 is incompletely recognized (%s). Parsing aborted. Please report the problem to %s" % (msg, version.__authoremail__) |
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125 | except IndexError : # EOF ? |
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126 | pass |
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127 | finally : |
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128 | minfile.close() |
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129 | return self.pagecount |
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