def readFromStream(stream, pdf):
idnum = b_("")
while True:
tok = stream.read(1)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if tok.isspace():
break
idnum += tok
generation = b_("")
while True:
tok = stream.read(1)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if tok.isspace():
break
generation += tok
r = stream.read(1)
if r != b_("R"):
raise utils.PdfReadError(
"Error reading indirect object reference at byte %s" %
utils.hexStr(stream.tell()))
return IndirectObject(int(idnum), int(generation), pdf)
def readStringFromStream(stream):
tok = stream.read(1)
parens = 1
txt = b_("")
while True:
tok = stream.read(1)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if tok == b_("("):
parens += 1
elif tok == b_(")"):
parens -= 1
if parens == 0:
break
elif tok == b_("\\"):
tok = stream.read(1)
if tok == b_("n"):
tok = b_("\n")
elif tok == b_("r"):
tok = b_("\r")
elif tok == b_("t"):
tok = b_("\t")
elif tok == b_("b"):
tok = b_("\b")
elif tok == b_("f"):
tok = b_("\f")
elif tok == b_("("):
tok = b_("(")
elif tok == b_(")"):
tok = b_(")")
elif tok == b_("\\"):
tok = b_("\\")
elif tok.isdigit():
# "The number ddd may consist of one, two, or three
# octal digits; high-order overflow shall be ignored.
# Three octal digits shall be used, with leading zeros
# as needed, if the next character of the string is also
# a digit." (PDF reference 7.3.4.2, p 16)
for i in range(2):
ntok = stream.read(1)
if ntok.isdigit():
tok += ntok
else:
break
tok = b_(chr(int(tok, base=8)))
elif tok in b_("\n\r"):
# This case is hit when a backslash followed by a line
# break occurs. If it's a multi-char EOL, consume the
# second character:
tok = stream.read(1)
if not tok in b_("\n\r"):
stream.seek(-1, 1)
# Then don't add anything to the actual string, since this
# line break was escaped:
tok = b_('')
else:
raise utils.PdfReadError("Unexpected escaped string")
txt += tok
return createStringObject(txt)
def readFromStream(stream):
debug = False
if debug: print stream.tell()
name = stream.read(1)
if name != b_("/"):
raise utils.PdfReadError, "name read error"
while True:
tok = stream.read(1)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if tok.isspace() or tok in NameObject.delimiterCharacters:
stream.seek(-1, 1)
break
name += tok
if debug: print name
return NameObject(name.decode('utf-8'))
def readHexStringFromStream(stream):
stream.read(1)
txt = ""
x = b_("")
while True:
tok = readNonWhitespace(stream)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if tok == b_(">"):
break
x += tok
if len(x) == 2:
txt += chr(int(x, base=16))
x = b_("")
if len(x) == 1:
x += b_("0")
if len(x) == 2:
txt += chr(int(x, base=16))
return createStringObject(b_(txt))
def readFromStream(stream, pdf):
debug = False
tmp = stream.read(2)
if tmp != b_("<<"):
raise utils.PdfReadError, \
("Dictionary read error at byte %s: stream must begin with '<<'" % utils.hexStr(stream.tell()))
data = {}
while True:
tok = readNonWhitespace(stream)
if not tok:
# stream has truncated prematurely
raise PdfStreamError("Stream has ended unexpectedly")
if debug: print "Tok:", tok
if tok == b_(">"):
stream.read(1)
break
stream.seek(-1, 1)
key = readObject(stream, pdf)
tok = readNonWhitespace(stream)
stream.seek(-1, 1)
value = readObject(stream, pdf)
if data.has_key(key):
# multiple definitions of key not permitted
raise utils.PdfReadError, ("Multiple definitions in dictionary at byte %s for key %s" \
% (utils.hexStr(stream.tell()), key))
data[key] = value
pos = stream.tell()
s = readNonWhitespace(stream)
if s == b_('s') and stream.read(5) == b_('tream'):
eol = stream.read(1)
# odd PDF file output has spaces after 'stream' keyword but before EOL.
# patch provided by Danial Sandler
while eol == b_(' '):
eol = stream.read(1)
assert eol in (b_("\n"), b_("\r"))
if eol == b_("\r"):
# read \n after
if stream.read(1) != '\n':
stream.seek(-1, 1)
# this is a stream object, not a dictionary
assert data.has_key("/Length")
length = data["/Length"]
if debug: print data
if isinstance(length, IndirectObject):
t = stream.tell()
length = pdf.getObject(length)
stream.seek(t, 0)
data["__streamdata__"] = stream.read(length)
if debug: print "here"
#if debug: print debugging.printAsHex(data["__streamdata__"])
e = readNonWhitespace(stream)
ndstream = stream.read(8)
if (e + ndstream) != b_("endstream"):
# (sigh) - the odd PDF file has a length that is too long, so
# we need to read backwards to find the "endstream" ending.
# ReportLab (unknown version) generates files with this bug,
# and Python users into PDF files tend to be our audience.
# we need to do this to correct the streamdata and chop off
# an extra character.
pos = stream.tell()
stream.seek(-10, 1)
end = stream.read(9)
if end == b_("endstream"):
# we found it by looking back one character further.
data["__streamdata__"] = data["__streamdata__"][:-1]
else:
# if debug: print "E", e, ndstream, debugging.toHex(end)
stream.seek(pos, 0)
raise utils.PdfReadError, \
("Unable to find 'endstream' marker after stream at byte %s." % utils.hexStr(stream.tell()))
else:
stream.seek(pos, 0)
if data.has_key("__streamdata__"):
return StreamObject.initializeFromDictionary(data)
else:
retval = DictionaryObject()
retval.update(data)
return retval
