1 | # -*- coding: UTF-8 -*- |
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2 | # |
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3 | # pkpgcounter : a generic Page Description Language parser |
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4 | # |
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5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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6 | # This program is free software: you can redistribute it and/or modify |
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7 | # it under the terms of the GNU General Public License as published by |
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8 | # the Free Software Foundation, either version 3 of the License, or |
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9 | # (at your option) any later version. |
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10 | # |
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11 | # This program is distributed in the hope that it will be useful, |
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12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | # GNU General Public License for more details. |
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15 | # |
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16 | # You should have received a copy of the GNU General Public License |
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17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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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 modules implements a page counter for HP LIDIL format. |
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23 | |
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24 | Documentation used : |
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25 | |
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26 | hplip-2.7.10/prnt/ldl.py |
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27 | hplip-2.7.10/prnt/hpijs/ldlencap.h |
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28 | """ |
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29 | |
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30 | import struct |
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31 | |
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32 | import pdlparser |
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33 | |
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34 | HEADERSIZE = 10 # LIDIL header is 10 bytes long |
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35 | |
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36 | # Packet types taken from hplip-2.7.10/prnt/ldl.py |
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37 | PACKET_TYPE_COMMAND = 0 |
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38 | PACKET_TYPE_DISABLE_PACING = 1 |
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39 | PACKET_TYPE_ENABLE_PACING = 2 |
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40 | PACKET_TYPE_RESUME_NORMAL_OPERATION = 3 |
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41 | PACKET_TYPE_DISABLE_RESPONSES = 4 |
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42 | PACKET_TYPE_ENABLE_RESPONSES = 5 |
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43 | PACKET_TYPE_RESET_LIDIL = 6 |
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44 | PACKET_TYPE_SYNC = 7 |
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45 | PACKET_TYPE_SYNC_COMPLETE = 8 |
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46 | |
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47 | # Command codes we are interested in. |
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48 | LDL_LOAD_PAGE = 1 |
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49 | LDL_EJECT_PAGE = 2 |
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50 | |
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51 | class Parser(pdlparser.PDLParser) : |
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52 | """A parser for HP LIDIL documents.""" |
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53 | format = "Hewlett-Packard LIDIL" |
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54 | def isValid(self) : |
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55 | """Returns True if data is LIDIL, else False.""" |
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56 | # Beginning Of File marker is a Sync packet, followed with |
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57 | # a Sync Complete packet followed with a Reset packet. |
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58 | # We just look at the start of the Sync packet for simplicity's sake. |
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59 | BOFMarker = "$\x01\x00\x00\x07" |
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60 | # End Of File marker is a Sync Complete packet followed |
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61 | # with a Reset packet. We ignore the preceding Sync packet |
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62 | # for simplicity's sake. |
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63 | EOFMarker = "$\x00\x10\x00\x08\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff$$\x00\x10\x00\x06\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff$" |
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64 | if self.firstblock.startswith(BOFMarker) \ |
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65 | and self.lastblock.endswith(EOFMarker) : |
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66 | return True |
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67 | else : |
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68 | return False |
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69 | |
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70 | def getJobSize(self) : |
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71 | """Computes the number of pages in a HP LIDIL document.""" |
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72 | unpack = struct.unpack |
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73 | ejectpage = loadpage = 0 |
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74 | try : |
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75 | while True : |
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76 | header = self.infile.read(HEADERSIZE) |
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77 | if not header : |
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78 | break |
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79 | if (len(header) != HEADERSIZE) or (header[0] != "$") : |
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80 | # Invalid header or no Frame Sync byte. |
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81 | raise pdlparser.PDLParserError, "This file doesn't seem to be valid Hewlett-Packard LIDIL datas." |
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82 | (framesync, |
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83 | cmdlength, |
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84 | dummy, |
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85 | packettype, |
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86 | commandnumber, |
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87 | referencenumber, |
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88 | datalength) = unpack(">BHBBBHH", header) |
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89 | if packettype == PACKET_TYPE_COMMAND : |
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90 | if commandnumber == LDL_LOAD_PAGE : |
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91 | loadpage += 1 |
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92 | elif commandnumber == LDL_EJECT_PAGE : |
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93 | ejectpage += 1 |
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94 | self.infile.seek(cmdlength + datalength - len(header), 1) # relative seek |
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95 | except struct.error : |
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96 | raise pdlparser.PDLParserError, "This file doesn't seem to be valid Hewlett-Packard LIDIL datas." |
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97 | |
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98 | # Number of page eject commands should be sufficient, |
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99 | # but we never know : someone could try to cheat the printer |
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100 | # by loading a page but not ejecting it, and ejecting it manually |
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101 | # later on. Not sure if the printers would support this, but |
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102 | # taking the max value works around the problem in any case. |
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103 | self.logdebug("Load : %i Eject : %i" % (loadpage, ejectpage)) |
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104 | return max(loadpage, ejectpage) |
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