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Contents
# encoding: utf-8
# cmap.rb : class for building ToUnicode CMaps for Type0 fonts
#
# Copyright May 2008, Gregory Brown / James Healy. All Rights Reserved.
#
# This is free software. Please see the LICENSE and COPYING files for details.
module Prawn
class Font
class CMap #:nodoc:
def initialize
@codes = {}
end
def [](c)
@codes[c]
end
def []=(c, v)
@codes[c] = v
end
def to_s
# TODO: learn what all this means. I just copied the basic structure
# from an existing PDF
# TODO: make this more efficient. The mapping can be specified in
# ranges instead of one -> one
res = "12 dict begin\n"
res << "begincmap\n"
res << "/CIDSystemInfo\n"
res << "<< /Registry (Adobe)\n"
res << "/Ordering (UCS)\n"
res << "/Supplement 0\n"
res << ">> def\n"
res << "/CMapName /Adobe-Identity-UCS def\n"
res << "/CMapType 2 def\n"
res << "begincodespacerange\n"
res << "<0000> <ffff>\n"
res << "endcodespacerange\n"
res << "9 beginbfchar\n"
@codes.keys.sort.each do |key|
val = @codes[key]
ccode = val.to_s(16)
ccode = ("0" * (4 - ccode.size)) + ccode
unicode = key.to_s(16)
unicode = ("0" * (4 - unicode.size)) + unicode
res << "<#{ccode}> <#{unicode}>\n"
end
res << "endbfchar\n"
res << "endcmap\n"
res << "CMapName currentdict /CMap defineresource pop\n"
res << "end\n"
res << "end\n"
end
end
end
end
Version data entries
7 entries across 7 versions & 4 rubygems