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