22 lines
641 B
Ruby
22 lines
641 B
Ruby
class ConfirmingSyncPatternState < StatePattern::State
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# Assumes that bytes[0] == Synchronizer::SYNC_PATTERN[0]
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def handle_byte_stream(bytes)
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idx = 0;
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sync_length = Synchronizer::SYNC_PATTERN.length
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# confirm rest of sync pattern
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while (idx < bytes.length && idx < sync_length && bytes[idx] == Synchronizer::SYNC_PATTERN[idx]) do idx = idx+1 end
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if (idx == sync_length)
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p "Sync pattern confirmed"
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transition_to(InSyncState)
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else
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p "Back to SearchingForSync state. idx = #{idx}."
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transition_to(SearchingForSyncState)
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end
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# return the rest
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return bytes[idx+1..-1] || ""
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end
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end
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