| 1 | |
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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: zjstream.py 374 2007-12-09 14:26:15Z jerome $ |
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| 21 | # |
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| 22 | |
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| 23 | """This modules implements a page counter for ZjStream documents.""" |
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| 24 | |
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| 25 | import struct |
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| 26 | |
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| 27 | import pdlparser |
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| 28 | |
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| 29 | class Parser(pdlparser.PDLParser) : |
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| 30 | """A parser for ZjStream documents.""" |
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| 31 | def isValid(self) : |
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| 32 | """Returns True if data is ZjStream, else False.""" |
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| 33 | if self.firstblock[:4] == "ZJZJ" : |
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| 34 | self.format = "Zenographics ZjStream (little endian)" |
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| 35 | return self.littleEndian() |
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| 36 | elif self.firstblock[:4] == "JZJZ" : |
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| 37 | self.format = "Zenographics ZjStream (big endian)" |
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| 38 | return self.bigEndian() |
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| 39 | elif (self.firstblock.find("\033%-12345XZJZJ") != -1) : |
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| 40 | self.format = "Zenographics ZjStream (little endian)" |
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| 41 | return self.littleEndian() |
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| 42 | elif (self.firstblock.find("\033%-12345XJZJZ") != -1) : |
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| 43 | self.format = "Zenographics ZjStream (big endian)" |
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| 44 | return self.bigEndian() |
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| 45 | else : |
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| 46 | return False |
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| 47 | |
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| 48 | def littleEndian(self) : |
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| 49 | """Toggles to little endianness.""" |
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| 50 | self.unpackHeader = "<IIIHH" |
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| 51 | return True |
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| 52 | |
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| 53 | def bigEndian(self) : |
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| 54 | """Toggles to big endianness.""" |
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| 55 | self.unpackHeader = ">IIIHH" |
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| 56 | return True |
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| 57 | |
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| 58 | def getJobSize(self) : |
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| 59 | """Computes the number of pages in a ZjStream document.""" |
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| 60 | poslittle=self.firstblock.find("\033%-12345XZJZJ") |
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| 61 | posbig=self.firstblock.find("\033%-12345XJZJZ") |
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| 62 | if posbig==-1 and poslittle==-1 : |
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| 63 | self.infile.seek(4, 0) # Skip ZJZJ/JZJZ header |
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| 64 | elif posbig==-1 : |
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| 65 | self.infile.seek(poslittle+13, 0) # Skip little endian header with PJL |
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| 66 | else: |
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| 67 | self.infile.seek(posbig+13, 0) # Skip big endian header with PJL |
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| 68 | |
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| 69 | startpagecount = endpagecount = 0 |
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| 70 | unpackHeader = self.unpackHeader |
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| 71 | unpack = struct.unpack |
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| 72 | try : |
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| 73 | while True : |
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| 74 | header = self.infile.read(16) |
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| 75 | if not header : |
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| 76 | break |
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| 77 | (totalChunkSize, |
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| 78 | chunkType, |
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| 79 | numberOfItems, |
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| 80 | reserved, |
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| 81 | signature) = unpack(unpackHeader, header) |
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| 82 | self.infile.seek(totalChunkSize - len(header), 1) |
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| 83 | if chunkType == 2 : |
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| 84 | #self.logdebug("startPage") |
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| 85 | startpagecount += 1 |
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| 86 | elif chunkType == 3 : |
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| 87 | #self.logdebug("endPage") |
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| 88 | endpagecount += 1 |
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| 89 | #elif chunkType == 0 : |
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| 90 | # self.logdebug("startDoc") |
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| 91 | #elif chunkType == 1 : |
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| 92 | # self.logdebug("endDoc") |
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| 93 | # |
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| 94 | #self.logdebug("Chunk size : %s" % totalChunkSize) |
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| 95 | #self.logdebug("Chunk type : 0x%08x" % chunkType) |
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| 96 | #self.logdebug("# items : %s" % numberOfItems) |
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| 97 | #self.logdebug("reserved : 0x%04x" % reserved) |
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| 98 | #self.logdebug("signature : 0x%04x" % signature) |
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| 99 | #self.logdebug("\n") |
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| 100 | except struct.error : |
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| 101 | raise pdlparser.PDLParserError, "This file doesn't seem to be valid ZjStream datas." |
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| 102 | |
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| 103 | # Number of endpage commands should be sufficient, |
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| 104 | # but we never know : someone could try to cheat the printer |
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| 105 | # by starting a page but not ending it, and ejecting it manually |
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| 106 | # later on. Not sure if the printers would support this, but |
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| 107 | # taking the max value works around the problem in any case. |
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| 108 | self.logdebug("StartPage : %i EndPage : %i" % (startpagecount, endpagecount)) |
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| 109 | return max(startpagecount, endpagecount) |
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