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266 lines
9.6 KiB
Python
266 lines
9.6 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2012-2013 Johannes 'josch' Schauer <j.schauer at email.de>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import Image
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import sys
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import zlib
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import argparse
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import struct
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from datetime import datetime
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def parse(cont, indent=1):
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if type(cont) is dict:
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return "<<\n"+"\n".join([4*indent*" "+"%s %s"%(k, parse(v, indent+1)) for k, v in cont.items()])+"\n"+4*(indent-1)*" "+">>"
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elif type(cont) is int or type(cont) is float:
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return str(cont)
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elif isinstance(cont, obj):
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return "%d 0 R"%cont.get_identifier()
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elif type(cont) is str:
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return cont
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elif type(cont) is list:
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return "[ "+" ".join([parse(c, indent) for c in cont])+" ]"
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class obj():
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def __init__(self, content, stream=None):
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self.content = content
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self.stream = stream
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def tostring(self, identifier):
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self.identifier = identifier
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if self.stream:
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return "%d 0 obj "%identifier+parse(self.content)+"\nstream\n"+self.stream+"\nendstream\nendobj\n"
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else:
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return "%d 0 obj "%identifier+parse(self.content)+" endobj\n"
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def get_identifier(self):
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if not hasattr(self, 'identifier'):
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raise Exception("no id set yet, call tostring() on obj first")
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return self.identifier
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def main(images, dpi, title=None, author=None, creator=None, producer=None,
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creationdate=None, moddate=None, subject=None, keywords=None,
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colorspace=None, verbose=False):
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version = 3 # default pdf version 1.3
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now = datetime.now()
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def debug_out(message):
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if verbose:
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sys.stderr.write("D: "+message+"\n")
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info = dict()
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if title:
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info["/Title"] = "("+title+")"
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if author:
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info["/Author"] = "("+author+")"
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if creator:
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info["/Creator"] = "("+creator+")"
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if producer:
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info["/Producer"] = "("+producer+")"
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if creationdate:
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info["/CreationDate"] = "(D:"+creationdate.strftime("%Y%m%d%H%M%S")+")"
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else:
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info["/CreationDate"] = "(D:"+now.strftime("%Y%m%d%H%M%S")+")"
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if moddate:
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info["/ModDate"] = "(D:"+moddate.strftime("%Y%m%d%H%M%S")+")"
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else:
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info["/ModDate"] = "(D:"+now.strftime("%Y%m%d%H%M%S")+")"
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if subject:
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info["/Subject"] = "("+subject+")"
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if keywords:
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info["/Keywords"] = "("+",".join(keywords)+")"
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info = obj(info)
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pagestuples = list()
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# create an incomplete pages object so that a /Parent entry can be added to each page
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pages = obj({
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"/Type": "/Pages"
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})
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for im in images:
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try:
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imgdata = Image.open(im)
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except IOError:
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# test if it is a jpeg2000 image
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im.seek(0)
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if im.read(12) != "\x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A":
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print "cannot read input image"
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exit(1)
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# image is jpeg2000
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imgformat = "JP2"
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offset, = struct.unpack(">I", im.read(4))
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im.seek(28+offset)
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height, width = struct.unpack(">II", im.read(8))
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if colorspace:
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color = colorspace
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else:
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color = "RGB" # TODO: read real colorspace
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if dpi:
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dpi_x, dpi_y = dpi, dpi
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else:
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dpi_x, dpi_y = (96, 96) # TODO: read real dpi
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else:
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width, height = imgdata.size
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if dpi:
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dpi_x, dpi_y = dpi, dpi
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else:
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dpi_x, dpi_y = imgdata.info.get("dpi", (96, 96))
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imgformat = imgdata.format
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if colorspace:
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color = colorspace
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else:
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color = imgdata.mode
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debug_out("width x height = %d x %d"%(width,height))
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if color == 'L':
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color = "/DeviceGray"
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elif color == 'RGB':
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color = "/DeviceRGB"
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elif color == '1':
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# TODO: /CCITTFaxDecode monochrome images
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imgdata = imgdata.convert('L')
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color = "/DeviceGray"
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else:
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print "unsupported color space:", color
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exit(1)
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pdf_x, pdf_y = 72.0*width/dpi_x, 72.0*height/dpi_y # pdf units = 1/72 inch
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# either embed the whole jpeg or deflate the bitmap representation
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if imgformat is "JPEG":
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ofilter = [ "/DCTDecode" ]
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im.seek(0)
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imgdata = im.read()
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elif imgformat is "JP2":
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ofilter = [ "/JPXDecode" ]
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im.seek(0)
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imgdata = im.read()
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version = 5 # jpeg2000 needs pdf 1.5
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else:
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ofilter = [ "/FlateDecode" ]
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imgdata = zlib.compress(imgdata.tostring())
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im.close()
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image = obj({
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"/Type": "/XObject",
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"/Subtype": "/Image",
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"/Filter": ofilter,
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"/Width": width,
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"/Height": height,
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"/ColorSpace": color,
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"/BitsPerComponent": 8, # hardcoded as PIL doesnt provide bits for non-jpeg formats
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"/Length": len(imgdata)
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}, imgdata)
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text = "q\n%f 0 0 %f 0 0 cm\n/Im0 Do\nQ"%(pdf_x, pdf_y)
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content = obj({
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"/Length": len(text)
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}, text)
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page = obj({
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"/Type": "/Page",
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"/Parent": pages,
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"/Resources": {
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"/XObject": {
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"/Im0": image
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}
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},
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"/MediaBox": [0, 0, pdf_x, pdf_y],
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"/Contents": content
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})
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pagestuples.append((image, content, page))
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# complete pages object with page information
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pages.content["/Kids"] = [ pagetuple[2] for pagetuple in pagestuples ]
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pages.content["/Count"] = len(pagestuples)
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catalog = obj({
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"/Pages": pages,
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"/Type": "/Catalog"
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})
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objects = list()
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objects.append(info.tostring(3*(len(pagestuples)+1)))
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pages.identifier = 2 # manually set it because each page references to it
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for i, (image, content, page) in enumerate(reversed(pagestuples)):
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objects.append(image.tostring(3*(len(pagestuples)-i+1)-1))
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objects.append(content.tostring(3*(len(pagestuples)-i+1)-2))
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objects.append(page.tostring(3*(len(pagestuples)-i+1)-3))
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objects.append(pages.tostring(2))
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objects.append(catalog.tostring(1))
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objects.reverse()
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xreftable = list()
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result = "%%PDF-1.%d\n"%version
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xreftable.append("0000000000 65535 f \n")
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for o in objects:
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xreftable.append("%010d 00000 n \n"%len(result))
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result += o
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xrefoffset = len(result)
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result += "xref\n"
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result += "0 %d\n"%len(xreftable)
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for x in xreftable:
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result += x
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result += "trailer\n"
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result += parse({"/Size": len(xreftable), "/Info": info, "/Root": catalog})+"\n"
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result += "startxref\n"
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result += "%d\n"%xrefoffset
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result += "%%EOF\n"
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return result
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description='lossless conversion/embedding of images (in)to pdf')
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parser.add_argument('images', metavar='infile', type=argparse.FileType('rb'),
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nargs='+', help='input file(s)')
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parser.add_argument('-o', '--output', metavar='out', type=argparse.FileType('wb'),
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default=sys.stdout, help='output file (default: stdout)')
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def positive_float(string):
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value = float(string)
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if value <= 0:
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msg = "%r is not positive"%string
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raise argparse.ArgumentTypeError(msg)
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return value
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parser.add_argument('-d', '--dpi', metavar='dpi', type=positive_float, help='dpi for pdf output (default: 96.0)')
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parser.add_argument('-t', '--title', metavar='title', type=str, help='title for metadata')
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parser.add_argument('-a', '--author', metavar='author', type=str, help='author for metadata')
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parser.add_argument('-c', '--creator', metavar='creator', type=str, help='creator for metadata')
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parser.add_argument('-p', '--producer', metavar='producer', type=str, help='producer for metadata')
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def valid_date(string):
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return datetime.strptime(string, "%Y-%m-%dT%H:%M:%S")
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parser.add_argument('-r', '--creationdate', metavar='creationdate',
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type=valid_date, help='creation date for metadata in YYYY-MM-DDTHH:MM:SS format')
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parser.add_argument('-m', '--moddate', metavar='moddate',
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type=valid_date, help='modification date for metadata in YYYY-MM-DDTHH:MM:SS format')
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parser.add_argument('-s', '--subject', metavar='subject', type=str, help='subject for metadata')
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parser.add_argument('-k', '--keywords', metavar='kw', type=str, nargs='+', help='keywords for metadata')
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parser.add_argument('-C', '--colorspace', metavar='colorspace', type=str, help='force PIL colorspace (one of: RGB, L, 1)')
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parser.add_argument('-v', '--verbose', help='verbose mode', action="store_true")
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args = parser.parse_args()
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args.output.write(main(args.images, args.dpi, args.title, args.author,
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args.creator, args.producer, args.creationdate, args.moddate,
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args.subject, args.keywords, args.colorspace, args.verbose))
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