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# coding: utf-8
################################################################################
#
# Copyright (C) 2006 Peter J Jones (pjones@pmade.com)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
class PDF::Reader
################################################################################
# An internal PDF::Reader class that helps to verify various parts of the PDF file
# are valid
class Error # :nodoc:
################################################################################
def self.str_assert (lvalue, rvalue, chars=nil)
raise MalformedPDFError, "PDF malformed, expected string but found #{lvalue.class} instead" if chars and !lvalue.kind_of?(String)
lvalue = lvalue[0,chars] if chars
raise MalformedPDFError, "PDF malformed, expected '#{rvalue}' but found #{lvalue} instead" if lvalue != rvalue
end
################################################################################
def self.str_assert_not (lvalue, rvalue, chars=nil)
raise MalformedPDFError, "PDF malformed, expected string but found #{lvalue.class} instead" if chars and !lvalue.kind_of?(String)
lvalue = lvalue[0,chars] if chars
raise MalformedPDFError, "PDF malformed, expected '#{rvalue}' but found #{lvalue} instead" if lvalue == rvalue
end
################################################################################
def self.assert_equal (lvalue, rvalue)
raise MalformedPDFError, "PDF malformed, expected #{rvalue} but found #{lvalue} instead" if lvalue != rvalue
end
################################################################################
end
################################################################################
# an exception that is raised when we believe the current PDF is not following
# the PDF spec and cannot be recovered
class MalformedPDFError < RuntimeError; end
################################################################################
# an exception that is raised when a PDF object appears to be invalid
class InvalidObjectError < MalformedPDFError; end
################################################################################
# an exception that is raised when a PDF follows the specs but uses a feature
# that we don't support just yet
class UnsupportedFeatureError < RuntimeError; end
################################################################################
# an exception that is raised when a PDF is encrypted and we don't have the
# necessary data to decrypt it
class EncryptedPDFError < UnsupportedFeatureError; end
end
################################################################################
|
