fiscal.rb in extface-0.1.8

- old
+ new
@@ -1,4 +1,76 @@
 module Extface
   module Driver::Epson::Fiscal
+    STX = 0x02
+    ETX = 0x03
+    SEP = 0x1c
+    DC2 = 0x12
+    DC4 = 0x14
+    NAK = 0x15
+    
+    module Control
+      STATUS_IF             = 0x38
+      X_Z_REPORTS           = 0x39
+      FISC_MEM_REPORT_DATE  = 0x3a
+      FISC_MEM_REPORT       = 0x3b
+    end
+    module Vouchers
+      OPEN_FISCAL_VOUCHER   = 0x40
+      PRINT_FISCAL_TEXT     = 0x41
+      PRINT_FISCAL_ARTICLE  = 0x42
+      SUBTOTAL_FISCAL       = 0x43
+      FISCAL_VOUCHER        = 0x44  # pay / cancel / discount in
+      CLOSE_FISCAL_VOUCHER  = 0x45
+    end
+    module NonFiscal
+      OPEN_NON_FISCAL_DOC   = 0x48
+      PRINT_NON_FISCAL_TEXT = 0x49
+      CLOSE_NON_FISCAL_DOC  = 0x4a
+    end
+    module Printer
+      CUT_PAPER         = 0x4b
+      ADVANCE_PAPER     = 0x50
+      ACTIVATE_SLIP     = 0xa0 #TMU950, TMU675
+      DISABLE_SLIP      = 0xa1
+      FORMAT_CHECKS     = 0xaa
+      FORMAT_ENDOSEMENT = 0xab
+    end
+    module General
+      SET_DATE_HOUR   = 0x58
+      GET_DATE_HOUR   = 0x59
+      HEADED          = 0x5d
+      FOOT_OF_PAGE    = 0x5e
+      OPEN_DRAWER_1   = 0x7b
+      OPEN_DRAWER_2   = 0x7c
+    end
+
+    def build_packet(cmd, fields = [])
+      String.new.tap() do |frame|
+        frame << STX
+        frame << sequence_number
+        frame << cmd
+        fields.each do |field|
+          frame << SEP
+          frame << field
+        end
+        frame << ETX
+        frame << bcc(frame)
+      end
+    end
+    
+    private
+      def bcc(buffer)
+        sum = 0
+        buffer.each_byte do |b|
+          sum += b
+        end
+        sum.to_s(16).rjust(4, '0')
+      end
+      
+      def sequence_number(increment = true)
+        @seq ||= 0x20
+        @seq += 1 if increment
+        @seq = 0x20 if @seq == 0x7f
+        @seq
+      end 
   end
 end
\ No newline at end of file