Model for reading created

State pattern implemented

app/helpers/ConfirmingSyncLossState.rb

@@ -0,0 +1,5 @@
+class ConfirmingSyncLossState < StatePattern::State
+  def handle_byte_stream(bytes)
+    p "Please override"
+  end
+end

app/helpers/ConfirmingSyncPatternState.rb

@@ -0,0 +1,21 @@
+class ConfirmingSyncPatternState < StatePattern::State
+  # Assumes that bytes[0] == Synchronizer::SYNC_PATTERN[0]
+  def handle_byte_stream(bytes)
+   idx = 0;
+   sync_length = Synchronizer::SYNC_PATTERN.length
+   
+   # confirm rest of sync pattern 
+   while ((idx < sync_length) && bytes[idx] == Synchronizer::SYNC_PATTERN[idx]) do idx = idx+1 end
+   
+   if (idx == sync_length)
+     #p "Sync pattern confirmed"
+     transition_to(InSyncState)
+   else  
+     #p "Back to SearchingForSync state. idx = #{idx}."
+     transition_to(SearchingForSyncState)
+   end
+  
+  # return the rest
+  return bytes[idx+1..-1]
+  end
+end

app/helpers/InSyncState.rb

@@ -0,0 +1,18 @@
+class InSyncState < StatePattern::State
+  
+  END_OF_FRAME = "!\n"
+
+  def handle_byte_stream(bytes)
+    idx = 0
+    frame = ""
+    while (idx < bytes.length && bytes[idx] != END_OF_FRAME[0]) do
+      frame = frame + bytes[idx]
+      idx = idx +1
+    end
+    p "------ FRAME -----"
+    frame_lines = frame.split("\n")
+    p frame_lines # should call to higher level
+    p "##################"
+    return ""
+  end
+end

app/helpers/SearchingForSyncState.rb

@@ -0,0 +1,13 @@
+class SearchingForSyncState < StatePattern::State
+  def handle_byte_stream(bytes)
+   idx = 0;
+   # spool unwanted bytes
+   while (bytes[idx] != Synchronizer::SYNC_PATTERN[0]) do idx = idx+1 end
+   
+   #p "Found pattern at idx = #{idx}"
+   transition_to(ConfirmingSyncPatternState)
+   
+   # return
+   return bytes[idx..-1]
+  end
+end

app/helpers/Synchronizer.rb

@@ -0,0 +1,8 @@
+class Synchronizer 
+  include StatePattern 
+  
+  SYNC_PATTERN = "\n/ISk5\\2ME382-1003\n\n"
+    
+  set_initial_state SearchingForSyncState
+
+end