[328] | 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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[443] | 6 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
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[463] | 7 | # This program is free software: you can redistribute it and/or modify |
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[328] | 8 | # it under the terms of the GNU General Public License as published by |
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[463] | 9 | # the Free Software Foundation, either version 3 of the License, or |
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[328] | 10 | # (at your option) any later version. |
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[463] | 11 | # |
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[328] | 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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[463] | 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[328] | 19 | # |
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| 20 | # $Id$ |
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| 21 | # |
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| 22 | |
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[484] | 23 | """This modules implements a page counter for HP LIDIL format. |
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[357] | 24 | |
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[484] | 25 | Documentation used : |
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| 26 | |
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| 27 | hplip-2.7.10/prnt/ldl.py |
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| 28 | hplip-2.7.10/prnt/hpijs/ldlencap.h |
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| 29 | """ |
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| 30 | |
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[328] | 31 | import sys |
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| 32 | import os |
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| 33 | import mmap |
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| 34 | from struct import unpack |
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| 35 | |
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| 36 | import pdlparser |
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| 37 | |
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[485] | 38 | # Packet types taken from hplip-2.7.10/prnt/ldl.py |
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| 39 | PACKET_TYPE_COMMAND = 0 |
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| 40 | PACKET_TYPE_DISABLE_PACING = 1 |
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| 41 | PACKET_TYPE_ENABLE_PACING = 2 |
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| 42 | PACKET_TYPE_RESUME_NORMAL_OPERATION = 3 |
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| 43 | PACKET_TYPE_DISABLE_RESPONSES = 4 |
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| 44 | PACKET_TYPE_ENABLE_RESPONSES = 5 |
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| 45 | PACKET_TYPE_RESET_LIDIL = 6 |
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| 46 | PACKET_TYPE_SYNC = 7 |
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| 47 | PACKET_TYPE_SYNC_COMPLETE = 8 |
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| 48 | |
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| 49 | # Command codes we are interested in. |
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| 50 | LDL_LOAD_PAGE = 1 |
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| 51 | LDL_EJECT_PAGE = 2 |
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| 52 | |
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[328] | 53 | class Parser(pdlparser.PDLParser) : |
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[482] | 54 | """A parser for HP LIDIL documents.""" |
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[328] | 55 | def isValid(self) : |
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[482] | 56 | """Returns True if data is LIDIL, else False.""" |
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[484] | 57 | # Beginning Of File marker is a Sync packet, followed with |
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| 58 | # a Sync Complete packet followed with a Reset packet. |
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| 59 | # We just look at the start of the Sync packet for simplicity's sake. |
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| 60 | BOFMarker = "$\x01\x00\x00\x07" |
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| 61 | # End Of File marker is a Sync Complete packet followed |
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| 62 | # with a Reset packet. We ignore the preceding Sync packet |
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| 63 | # for simplicity's sake. |
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[482] | 64 | EOFMarker = "$\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$" |
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| 65 | if self.firstblock.startswith(BOFMarker) \ |
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[484] | 66 | and self.lastblock.endswith(EOFMarker) : |
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[482] | 67 | self.logdebug("DEBUG: Input file is in the Hewlett-Packard LIDIL format.") |
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[387] | 68 | return True |
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[328] | 69 | else : |
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[387] | 70 | return False |
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[328] | 71 | |
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| 72 | def getJobSize(self) : |
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[482] | 73 | """Computes the number of pages in a HP LIDIL document.""" |
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[485] | 74 | pagecount = 0 |
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| 75 | infileno = self.infile.fileno() |
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| 76 | minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED) |
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| 77 | pos = 0 |
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| 78 | try : |
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| 79 | try : |
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| 80 | while 1 : |
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| 81 | if minfile[pos] != "$" : # Frame Sync |
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| 82 | raise pdlparser.PDLParserError, "This file doesn't seem to be valid Hewlett-Packard LIDIL datas" |
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| 83 | try : |
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| 84 | (framesync, |
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| 85 | cmdlength, |
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| 86 | dummy, |
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| 87 | packettype, |
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| 88 | commandnumber, |
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| 89 | referencenumber, |
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| 90 | datalength) = unpack(">BHBBBHH", minfile[pos:pos+10]) |
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| 91 | except struct.error : |
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| 92 | raise pdlparser.PDLParserError, "This file doesn't seem to be valid Hewlett-Packard LIDIL datas" |
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| 93 | if (packettype == PACKET_TYPE_COMMAND) \ |
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| 94 | and (commandnumber == LDL_EJECT_PAGE) : |
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| 95 | pagecount += 1 |
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| 96 | pos += (cmdlength + datalength) |
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| 97 | except IndexError : # EOF ? |
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| 98 | pass |
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| 99 | finally : |
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| 100 | minfile.close() |
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| 101 | return pagecount |
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[482] | 102 | |
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[328] | 103 | if __name__ == "__main__" : |
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[415] | 104 | pdlparser.test(Parser) |
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