/usr/lib/ruby/vendor_ruby/pdf/reader/font.rb is in ruby-pdf-reader 1.3.3-1.
This file is owned by root:root, with mode 0o644.
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################################################################################
#
# Copyright (C) 2008 James Healy (jimmy@deefa.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.
#
################################################################################
require 'pdf/reader/width_calculator'
class PDF::Reader
# Represents a single font PDF object and provides some useful methods
# for extracting info. Mainly used for converting text to UTF-8.
#
class Font
attr_accessor :subtype, :encoding, :descendantfonts, :tounicode
attr_reader :widths, :first_char, :last_char, :basefont, :font_descriptor,
:cid_widths, :cid_default_width
def initialize(ohash = nil, obj = nil)
if ohash.nil? || obj.nil?
$stderr.puts "DEPREACTION WARNING - PDF::Reader::Font.new should be called with 2 args"
return
end
@ohash = ohash
@tounicode = nil
extract_base_info(obj)
extract_descriptor(obj)
extract_descendants(obj)
@width_calc = build_width_calculator
@encoding ||= PDF::Reader::Encoding.new(:StandardEncoding)
end
def basefont=(font)
@encoding ||= default_encoding(font)
@basefont = font
end
def to_utf8(params)
if @tounicode
to_utf8_via_cmap(params)
else
to_utf8_via_encoding(params)
end
end
def unpack(data)
data.unpack(encoding.unpack)
end
# looks up the specified codepoint and returns a value that is in (pdf)
# glyph space, which is 1000 glyph units = 1 text space unit
def glyph_width(code_point)
if code_point.is_a?(String)
code_point = code_point.unpack(encoding.unpack).first
end
@cached_widths ||= {}
@cached_widths[code_point] ||= @width_calc.glyph_width(code_point)
end
private
def default_encoding(font_name)
case font_name.to_s
when "Symbol" then
PDF::Reader::Encoding.new(:SymbolEncoding)
when "ZapfDingbats" then
PDF::Reader::Encoding.new(:ZapfDingbatsEncoding)
else
PDF::Reader::Encoding.new(:StandardEncoding)
end
end
def build_width_calculator
if @subtype == :Type0
PDF::Reader::WidthCalculator::TypeZero.new(self)
elsif @subtype == :Type1
if @font_descriptor.nil?
PDF::Reader::WidthCalculator::BuiltIn.new(self)
else
PDF::Reader::WidthCalculator::TypeOneOrThree .new(self)
end
elsif @subtype == :Type3
PDF::Reader::WidthCalculator::TypeOneOrThree.new(self)
elsif @subtype == :TrueType
PDF::Reader::WidthCalculator::TypeOneOrThree.new(self)
elsif @subtype == :CIDFontType0 || @subtype == :CIDFontType2
PDF::Reader::WidthCalculator::Composite.new(self)
else
PDF::Reader::WidthCalculator::TypeOneOrThree.new(self)
end
end
def extract_base_info(obj)
@subtype = @ohash.object(obj[:Subtype])
@basefont = @ohash.object(obj[:BaseFont])
if @ohash.object(obj[:Encoding])
@encoding = PDF::Reader::Encoding.new(@ohash.object(obj[:Encoding]))
else
@encoding = default_encoding(@basefont)
end
@widths = @ohash.object(obj[:Widths]) || []
@first_char = @ohash.object(obj[:FirstChar])
@last_char = @ohash.object(obj[:LastChar])
# CID Fonts are not required to have a W or DW entry, if they don't exist,
# the default cid width = 1000, see Section 9.7.4.1 PDF 32000-1:2008 pp 269
@cid_widths = @ohash.object(obj[:W]) || []
@cid_default_width = @ohash.object(obj[:DW]) || 1000
if obj[:ToUnicode]
# ToUnicode is optional for Type1 and Type3
stream = @ohash.object(obj[:ToUnicode])
@tounicode = PDF::Reader::CMap.new(stream.unfiltered_data)
end
end
def extract_descriptor(obj)
if obj[:FontDescriptor]
# create a font descriptor object if we can, in other words, unless this is
# a CID Font
fd = @ohash.object(obj[:FontDescriptor])
@font_descriptor = PDF::Reader::FontDescriptor.new(@ohash, fd)
else
@font_descriptor = nil
end
end
def extract_descendants(obj)
return unless obj[:DescendantFonts]
# per PDF 32000-1:2008 pp. 280 :DescendentFonts is:
# A one-element array specifying the CIDFont dictionary that is the
# descendant of this Type 0 font.
descendants = @ohash.object(obj[:DescendantFonts])
@descendantfonts = descendants.map { |desc|
PDF::Reader::Font.new(@ohash, @ohash.object(desc))
}
end
def to_utf8_via_cmap(params)
if params.class == Fixnum
[
@tounicode.decode(params) || PDF::Reader::Encoding::UNKNOWN_CHAR
].flatten.pack("U*")
elsif params.class == String
params.unpack(encoding.unpack).map { |c|
@tounicode.decode(c) || PDF::Reader::Encoding::UNKNOWN_CHAR
}.flatten.pack("U*")
elsif params.class == Array
params.collect { |param| to_utf8_via_cmap(param) }
else
params
end
end
def to_utf8_via_encoding(params)
if encoding.kind_of?(String)
raise UnsupportedFeatureError, "font encoding '#{encoding}' currently unsupported"
end
if params.class == Fixnum
encoding.int_to_utf8_string(params)
elsif params.class == String
encoding.to_utf8(params)
elsif params.class == Array
params.collect { |param| to_utf8_via_encoding(param) }
else
params
end
end
end
end
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