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port_src/output/zxing/datamatrix/encoder/edifact_encoder.rs

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+/*
+ * Copyright 2006-2007 Jeremias Maerki.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// package com::google::zxing::datamatrix::encoder;
+
+#[derive(Encoder)]
+struct EdifactEncoder {
+}
+
+impl EdifactEncoder {
+
+    pub fn  get_encoding_mode(&self) -> i32  {
+        return HighLevelEncoder::EDIFACT_ENCODATION;
+    }
+
+    pub fn  encode(&self,  context: &EncoderContext)   {
+        //step F
+         let buffer: StringBuilder = StringBuilder::new();
+        while context.has_more_characters() {
+             let c: char = context.get_current_char();
+            ::encode_char(c, &buffer);
+            context.pos += 1;
+             let count: i32 = buffer.length();
+            if count >= 4 {
+                context.write_codewords(&::encode_to_codewords(&buffer));
+                buffer.delete(0, 4);
+                 let new_mode: i32 = HighLevelEncoder::look_ahead_test(&context.get_message(), context.pos, &self.get_encoding_mode());
+                if new_mode != self.get_encoding_mode() {
+                    // Return to ASCII encodation, which will actually handle latch to new mode
+                    context.signal_encoder_change(HighLevelEncoder::ASCII_ENCODATION);
+                    break;
+                }
+            }
+        }
+        //Unlatch
+        buffer.append(31 as char);
+        ::handle_e_o_d(context, &buffer);
+    }
+
+    /**
+   * Handle "end of data" situations
+   *
+   * @param context the encoder context
+   * @param buffer  the buffer with the remaining encoded characters
+   */
+    fn  handle_e_o_d( context: &EncoderContext,  buffer: &CharSequence)   {
+        let tryResult1 = 0;
+        'try1: loop {
+        {
+             let count: i32 = buffer.length();
+            if count == 0 {
+                //Already finished
+                return;
+            }
+            if count == 1 {
+                //Only an unlatch at the end
+                context.update_symbol_info();
+                 let mut available: i32 = context.get_symbol_info().get_data_capacity() - context.get_codeword_count();
+                 let remaining: i32 = context.get_remaining_characters();
+                // The following two lines are a hack inspired by the 'fix' from https://sourceforge.net/p/barcode4j/svn/221/
+                if remaining > available {
+                    context.update_symbol_info(context.get_codeword_count() + 1);
+                    available = context.get_symbol_info().get_data_capacity() - context.get_codeword_count();
+                }
+                if remaining <= available && available <= 2 {
+                    //No unlatch
+                    return;
+                }
+            }
+            if count > 4 {
+                throw IllegalStateException::new("Count must not exceed 4");
+            }
+             let rest_chars: i32 = count - 1;
+             let encoded: String = ::encode_to_codewords(&buffer);
+             let end_of_symbol_reached: bool = !context.has_more_characters();
+             let rest_in_ascii: bool = end_of_symbol_reached && rest_chars <= 2;
+            if rest_chars <= 2 {
+                context.update_symbol_info(context.get_codeword_count() + rest_chars);
+                 let available: i32 = context.get_symbol_info().get_data_capacity() - context.get_codeword_count();
+                if available >= 3 {
+                    rest_in_ascii = false;
+                    context.update_symbol_info(context.get_codeword_count() + encoded.length());
+                //available = context.symbolInfo.dataCapacity - context.getCodewordCount();
+                }
+            }
+            if rest_in_ascii {
+                context.reset_symbol_info();
+                context.pos -= rest_chars;
+            } else {
+                context.write_codewords(&encoded);
+            }
+        }
+        break 'try1
+        }
+        match tryResult1 {
+              0 => break
+        }
+         finally {
+            context.signal_encoder_change(HighLevelEncoder::ASCII_ENCODATION);
+        }
+    }
+
+    fn  encode_char( c: char,  sb: &StringBuilder)   {
+        if c >= ' ' && c <= '?' {
+            sb.append(c);
+        } else if c >= '@' && c <= '^' {
+            sb.append((c - 64) as char);
+        } else {
+            HighLevelEncoder::illegal_character(c);
+        }
+    }
+
+    fn  encode_to_codewords( sb: &CharSequence) -> String  {
+         let len: i32 = sb.length();
+        if len == 0 {
+            throw IllegalStateException::new("StringBuilder must not be empty");
+        }
+         let c1: char = sb.char_at(0);
+         let c2: char =  if len >= 2 { sb.char_at(1) } else { 0 };
+         let c3: char =  if len >= 3 { sb.char_at(2) } else { 0 };
+         let c4: char =  if len >= 4 { sb.char_at(3) } else { 0 };
+         let v: i32 = (c1 << 18) + (c2 << 12) + (c3 << 6) + c4;
+         let cw1: char = ((v >> 16) & 255) as char;
+         let cw2: char = ((v >> 8) & 255) as char;
+         let cw3: char = (v & 255) as char;
+         let res: StringBuilder = StringBuilder::new(3);
+        res.append(cw1);
+        if len >= 2 {
+            res.append(cw2);
+        }
+        if len >= 3 {
+            res.append(cw3);
+        }
+        return res.to_string();
+    }
+}
+