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# frozen_string_literal: true
module TTFunk
# SFNT table directory.
class Directory
# Table descriptors
# @return [Hash{String => Hash}]
attr_reader :tables
# Scaler type
# @return [Integer]
attr_reader :scaler_type
def initialize(io, offset = 0)
io.seek(offset)
# https://www.microsoft.com/typography/otspec/otff.htm#offsetTable
# We're ignoring searchRange, entrySelector, and rangeShift here, but
# skipping past them to get to the table information.
@scaler_type, table_count = io.read(12).unpack('Nn')
@tables = {}
table_count.times do
tag, checksum, offset, length = io.read(16).unpack('a4N*')
@tables[tag] = {
tag: tag,
checksum: checksum,
offset: offset,
length: length,
}
end
end
end
end
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