50 lines
949 B
Ruby
50 lines
949 B
Ruby
# frozen_string_literal: true
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module TTFunk
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# Helper methods to read form file content.
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# @api rpivate
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module Reader
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private
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def io
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@file.contents
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end
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def read(bytes, format)
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io.read(bytes).unpack(format)
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end
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def read_signed(count)
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read(count * 2, 'n*').map { |i| to_signed(i) }
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end
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def to_signed(number)
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number >= 0x8000 ? -((number ^ 0xFFFF) + 1) : number
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end
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def parse_from(position)
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saved = io.pos
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io.pos = position
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result = yield(position)
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io.pos = saved
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result
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end
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# For debugging purposes
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def hexdump(string)
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bytes = string.unpack('C*')
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bytes.each_with_index do |c, i|
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printf('%02X', c)
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if ((i + 1) % 16).zero?
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puts
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elsif ((i + 1) % 8).zero?
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print(' ')
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else
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print(' ')
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end
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end
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puts if (bytes.length % 16) != 0
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end
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end
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end
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