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