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img2pdf
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do not encode as utf8 as pdf is ascii, add safer handling across py2/py3

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josch 9 years ago
parent 53fdf81c37
commit 317a0ee7f2
1 changed files with 75 additions and 62 deletions
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137
src/img2pdf.py
Unescape Escape View File

@ -46,20 +46,22 @@ def warning_out(message):
def parse(cont, indent=1): def parse(cont, indent=1):
if type(cont) is dict: if type(cont) is dict:
return b"<<\n"+b"\n".join( return b"<<\n"+b"\n".join(
[4 * indent * b" " + k.encode("utf8") + b" " + parse(v, indent+1) [4 * indent * b" " + k + b" " + parse(v, indent+1)
for k, v in sorted(cont.items())])+b"\n"+4*(indent-1)*b" "+b">>" for k, v in sorted(cont.items())])+b"\n"+4*(indent-1)*b" "+b">>"
elif type(cont) is int: elif type(cont) is int:
return str(cont).encode("utf8") return str(cont).encode()
elif type(cont) is float: elif type(cont) is float:
return ("%0.4f"%cont).encode("utf8") return ("%0.4f"%cont).encode()
elif isinstance(cont, obj): elif isinstance(cont, obj):
return ("%d 0 R"%cont.identifier).encode("utf8") return ("%d 0 R"%cont.identifier).encode()
elif type(cont) is str: elif type(cont) is str or type(cont) is bytes:
return cont.encode("utf8") if type(cont) is str and type(cont) is not bytes:
elif type(cont) is bytes: raise Exception("parse must be passed a bytes object in py3")
return cont return cont
elif type(cont) is list: elif type(cont) is list:
return b"[ "+b" ".join([parse(c, indent) for c in cont])+b" ]" return b"[ "+b" ".join([parse(c, indent) for c in cont])+b" ]"
else:
raise Exception("cannot handle type %s"%type(cont))
class obj(object): class obj(object):
def __init__(self, content, stream=None): def __init__(self, content, stream=None):
@ -69,11 +71,11 @@ class obj(object):
def tostring(self): def tostring(self):
if self.stream: if self.stream:
return ( return (
("%d 0 obj " % self.identifier).encode("utf8") + ("%d 0 obj " % self.identifier).encode() +
parse(self.content) + parse(self.content) +
b"\nstream\n" + self.stream + b"\nendstream\nendobj\n") b"\nstream\n" + self.stream + b"\nendstream\nendobj\n")
else: else:
return ("%d 0 obj "%self.identifier).encode("utf8")+parse(self.content)+b" endobj\n" return ("%d 0 obj "%self.identifier).encode()+parse(self.content)+b" endobj\n"
class pdfdoc(object): class pdfdoc(object):
@ -86,39 +88,39 @@ class pdfdoc(object):
info = {} info = {}
if title: if title:
info["/Title"] = "("+title+")" info[b"/Title"] = b"("+title+b")"
if author: if author:
info["/Author"] = "("+author+")" info[b"/Author"] = b"("+author+b")"
if creator: if creator:
info["/Creator"] = "("+creator+")" info[b"/Creator"] = b"("+creator+b")"
if producer: if producer:
info["/Producer"] = "("+producer+")" info[b"/Producer"] = b"("+producer+b")"
if creationdate: if creationdate:
info["/CreationDate"] = "(D:"+creationdate.strftime("%Y%m%d%H%M%S")+")" info[b"/CreationDate"] = b"(D:"+creationdate.strftime("%Y%m%d%H%M%S").encode()+b")"
elif not nodate: elif not nodate:
info["/CreationDate"] = "(D:"+now.strftime("%Y%m%d%H%M%S")+")" info[b"/CreationDate"] = b"(D:"+now.strftime("%Y%m%d%H%M%S").encode()+b")"
if moddate: if moddate:
info["/ModDate"] = "(D:"+moddate.strftime("%Y%m%d%H%M%S")+")" info[b"/ModDate"] = b"(D:"+moddate.strftime("%Y%m%d%H%M%S").encode()+b")"
elif not nodate: elif not nodate:
info["/ModDate"] = "(D:"+now.strftime("%Y%m%d%H%M%S")+")" info[b"/ModDate"] = b"(D:"+now.strftime("%Y%m%d%H%M%S").encode()+b")"
if subject: if subject:
info["/Subject"] = "("+subject+")" info[b"/Subject"] = b"("+subject+b")"
if keywords: if keywords:
info["/Keywords"] = "("+",".join(keywords)+")" info[b"/Keywords"] = b"("+b",".join(keywords)+b")"
self.info = obj(info) self.info = obj(info)
# create an incomplete pages object so that a /Parent entry can be # create an incomplete pages object so that a /Parent entry can be
# added to each page # added to each page
self.pages = obj({ self.pages = obj({
"/Type": "/Pages", b"/Type": b"/Pages",
"/Kids": [], b"/Kids": [],
"/Count": 0 b"/Count": 0
}) })
self.catalog = obj({ self.catalog = obj({
"/Pages": self.pages, b"/Pages": self.pages,
"/Type": "/Catalog" b"/Type": b"/Catalog"
}) })
self.addobj(self.catalog) self.addobj(self.catalog)
self.addobj(self.pages) self.addobj(self.pages)
@ -130,11 +132,11 @@ class pdfdoc(object):
def addimage(self, color, width, height, imgformat, imgdata, pdf_x, pdf_y): def addimage(self, color, width, height, imgformat, imgdata, pdf_x, pdf_y):
if color == 'L': if color == 'L':
colorspace = "/DeviceGray" colorspace = b"/DeviceGray"
elif color == 'RGB': elif color == 'RGB':
colorspace = "/DeviceRGB" colorspace = b"/DeviceRGB"
elif color == 'CMYK' or color == 'CMYK;I': elif color == 'CMYK' or color == 'CMYK;I':
colorspace = "/DeviceCMYK" colorspace = b"/DeviceCMYK"
else: else:
error_out("unsupported color space: %s"%color) error_out("unsupported color space: %s"%color)
exit(1) exit(1)
@ -144,47 +146,47 @@ class pdfdoc(object):
# either embed the whole jpeg or deflate the bitmap representation # either embed the whole jpeg or deflate the bitmap representation
if imgformat is "JPEG": if imgformat is "JPEG":
ofilter = [ "/DCTDecode" ] ofilter = [ b"/DCTDecode" ]
elif imgformat is "JPEG2000": elif imgformat is "JPEG2000":
ofilter = [ "/JPXDecode" ] ofilter = [ b"/JPXDecode" ]
self.version = 5 # jpeg2000 needs pdf 1.5 self.version = 5 # jpeg2000 needs pdf 1.5
else: else:
ofilter = [ "/FlateDecode" ] ofilter = [ b"/FlateDecode" ]
image = obj({ image = obj({
"/Type": "/XObject", b"/Type": b"/XObject",
"/Subtype": "/Image", b"/Subtype": b"/Image",
"/Filter": ofilter, b"/Filter": ofilter,
"/Width": width, b"/Width": width,
"/Height": height, b"/Height": height,
"/ColorSpace": colorspace, b"/ColorSpace": colorspace,
# hardcoded as PIL doesnt provide bits for non-jpeg formats # hardcoded as PIL doesnt provide bits for non-jpeg formats
"/BitsPerComponent": 8, b"/BitsPerComponent": 8,
"/Length": len(imgdata) b"/Length": len(imgdata)
}, imgdata) }, imgdata)
if color == 'CMYK;I': if color == 'CMYK;I':
# Inverts all four channels # Inverts all four channels
image.content['/Decode'] = [1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0] image.content[b'/Decode'] = [1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
text = ("q\n%0.4f 0 0 %0.4f 0 0 cm\n/Im0 Do\nQ"%(pdf_x, pdf_y)).encode('utf8') text = ("q\n%0.4f 0 0 %0.4f 0 0 cm\n/Im0 Do\nQ"%(pdf_x, pdf_y)).encode()
content = obj({ content = obj({
"/Length": len(text) b"/Length": len(text)
}, text) }, text)
page = obj({ page = obj({
"/Type": "/Page", b"/Type": b"/Page",
"/Parent": self.pages, b"/Parent": self.pages,
"/Resources": { b"/Resources": {
"/XObject": { b"/XObject": {
"/Im0": image b"/Im0": image
} }
}, },
"/MediaBox": [0, 0, pdf_x, pdf_y], b"/MediaBox": [0, 0, pdf_x, pdf_y],
"/Contents": content b"/Contents": content
}) })
self.pages.content["/Kids"].append(page) self.pages.content[b"/Kids"].append(page)
self.pages.content["/Count"] += 1 self.pages.content[b"/Count"] += 1
self.addobj(page) self.addobj(page)
self.addobj(content) self.addobj(content)
self.addobj(image) self.addobj(image)
@ -195,22 +197,22 @@ class pdfdoc(object):
xreftable = list() xreftable = list()
result = ("%%PDF-1.%d\n"%self.version).encode("utf8") result = ("%%PDF-1.%d\n"%self.version).encode()
xreftable.append(b"0000000000 65535 f \n") xreftable.append(b"0000000000 65535 f \n")
for o in self.objects: for o in self.objects:
xreftable.append(("%010d 00000 n \n"%len(result)).encode("utf8")) xreftable.append(("%010d 00000 n \n"%len(result)).encode())
result += o.tostring() result += o.tostring()
xrefoffset = len(result) xrefoffset = len(result)
result += b"xref\n" result += b"xref\n"
result += ("0 %d\n"%len(xreftable)).encode("utf8") result += ("0 %d\n"%len(xreftable)).encode()
for x in xreftable: for x in xreftable:
result += x result += x
result += b"trailer\n" result += b"trailer\n"
result += parse({"/Size": len(xreftable), "/Info": self.info, "/Root": self.catalog})+b"\n" result += parse({b"/Size": len(xreftable), b"/Info": self.info, b"/Root": self.catalog})+b"\n"
result += b"startxref\n" result += b"startxref\n"
result += ("%d\n"%xrefoffset).encode("utf8") result += ("%d\n"%xrefoffset).encode()
result += b"%%EOF\n" result += b"%%EOF\n"
return result return result
@ -508,6 +510,17 @@ def valid_size(string):
return (x, y, pagesize_options) return (x, y, pagesize_options)
# in python3, the received argument will be a unicode str() object which needs
# to be encoded into a bytes() object
# in python2, the received argument will be a binary str() object which needs
# no encoding
# we check whether we use python2 or python3 by checking whether the argument
# is both, type str and type bytes (only the case in python2)
def pdf_embedded_string(string):
if type(string) is str and type(string) is not bytes:
string = string.encode("utf8")
return string
parser = argparse.ArgumentParser( parser = argparse.ArgumentParser(
description='Lossless conversion/embedding of images (in)to pdf') description='Lossless conversion/embedding of images (in)to pdf')
parser.add_argument( parser.add_argument(
@ -540,16 +553,16 @@ sizeopts.add_argument(
) )
parser.add_argument( parser.add_argument(
'-t', '--title', metavar='title', type=str, '-t', '--title', metavar='title', type=pdf_embedded_string,
help='title for metadata') help='title for metadata')
parser.add_argument( parser.add_argument(
'-a', '--author', metavar='author', type=str, '-a', '--author', metavar='author', type=pdf_embedded_string,
help='author for metadata') help='author for metadata')
parser.add_argument( parser.add_argument(
'-c', '--creator', metavar='creator', type=str, '-c', '--creator', metavar='creator', type=pdf_embedded_string,
help='creator for metadata') help='creator for metadata')
parser.add_argument( parser.add_argument(
'-p', '--producer', metavar='producer', type=str, '-p', '--producer', metavar='producer', type=pdf_embedded_string,
help='producer for metadata') help='producer for metadata')
parser.add_argument( parser.add_argument(
'-r', '--creationdate', metavar='creationdate', type=valid_date, '-r', '--creationdate', metavar='creationdate', type=valid_date,
@ -558,13 +571,13 @@ parser.add_argument(
'-m', '--moddate', metavar='moddate', type=valid_date, '-m', '--moddate', metavar='moddate', type=valid_date,
help='modification date for metadata in YYYY-MM-DDTHH:MM:SS format') help='modification date for metadata in YYYY-MM-DDTHH:MM:SS format')
parser.add_argument( parser.add_argument(
'-S', '--subject', metavar='subject', type=str, '-S', '--subject', metavar='subject', type=pdf_embedded_string,
help='subject for metadata') help='subject for metadata')
parser.add_argument( parser.add_argument(
'-k', '--keywords', metavar='kw', type=str, nargs='+', '-k', '--keywords', metavar='kw', type=pdf_embedded_string, nargs='+',
help='keywords for metadata') help='keywords for metadata')
parser.add_argument( parser.add_argument(
'-C', '--colorspace', metavar='colorspace', type=str, '-C', '--colorspace', metavar='colorspace', type=pdf_embedded_string,
help='force PIL colorspace (one of: RGB, L, 1, CMYK, CMYK;I)') help='force PIL colorspace (one of: RGB, L, 1, CMYK, CMYK;I)')
parser.add_argument( parser.add_argument(
'-D', '--nodate', help='do not add timestamps', action="store_true") '-D', '--nodate', help='do not add timestamps', action="store_true")

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