Add minimal support for FNC1 mode in QR Code

git-svn-id: https://zxing.googlecode.com/svn/trunk@489 59b500cc-1b3d-0410-9834-0bbf25fbcc57

core/src/com/google/zxing/client/result/SMSResultParser.java

@@ -1,64 +0,0 @@
-/*
- * Copyright 2008 ZXing authors
- *
- * 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.client.result;
-
-import com.google.zxing.Result;
-
-/**
- * Parses an "sms:" URI result, which specifies a number to SMS and optional
- * "via" number. See <a href="http://gbiv.com/protocols/uri/drafts/draft-antti-gsm-sms-url-04.txt">
- * the IETF draft</a> on this.
- *
- * @author srowen@google.com (Sean Owen)
- */
-public final class SMSResultParser extends ResultParser {
-
-  private SMSResultParser() {
-  }
-
-  public static SMSParsedResult parse(Result result) {
-    String rawText = result.getText();
-    if (rawText == null || !rawText.startsWith("sms:")) {
-      return null;
-    }
-    // Drop sms, query portion
-    int queryStart = rawText.indexOf('?', 4);
-    String smsURIWithoutQuery;
-    if (queryStart < 0) {
-      smsURIWithoutQuery = rawText.substring(4);
-    } else {
-      smsURIWithoutQuery = rawText.substring(4, queryStart);
-    }
-    int numberEnd = smsURIWithoutQuery.indexOf(';');
-    String number;
-    String via;
-    if (numberEnd < 0) {
-      number = smsURIWithoutQuery;
-      via = null;
-    } else {
-      number = smsURIWithoutQuery.substring(0, numberEnd);
-      String maybeVia = smsURIWithoutQuery.substring(numberEnd + 1);
-      if (maybeVia.startsWith("via=")) {
-        via = maybeVia.substring(4);
-      } else {
-        via = null;
-      }
-    }
-    return new SMSParsedResult(rawText, number, via, null, null, null);
-  }
-
-}

core/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java

@@ -58,6 +58,7 @@ final class DecodedBitStreamParser {
     BitSource bits = new BitSource(bytes);
     StringBuffer result = new StringBuffer();
     CharacterSetECI currentCharacterSetECI = null;
+    boolean fc1InEffect = false;
     Mode mode;
     do {
       // While still another segment to read...
@@ -68,7 +69,10 @@ final class DecodedBitStreamParser {
         mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
       }
       if (!mode.equals(Mode.TERMINATOR)) {
-        if (mode.equals(Mode.ECI)) {
+        if (mode.equals(Mode.FNC1_FIRST_POSITION) || mode.equals(Mode.FNC1_SECOND_POSITION)) {
+          // We do little with FNC1 except alter the parsed result a bit according to the spec
+          fc1InEffect = true;
+        } else if (mode.equals(Mode.ECI)) {
           // Count doesn't apply to ECI
           int value = ECI.parseECI(bits);
           try {
@@ -82,7 +86,7 @@ final class DecodedBitStreamParser {
           if (mode.equals(Mode.NUMERIC)) {
             decodeNumericSegment(bits, result, count);
           } else if (mode.equals(Mode.ALPHANUMERIC)) {
-            decodeAlphanumericSegment(bits, result, count);
+            decodeAlphanumericSegment(bits, result, count, fc1InEffect);
           } else if (mode.equals(Mode.BYTE)) {
             decodeByteSegment(bits, result, count, currentCharacterSetECI);
           } else if (mode.equals(Mode.KANJI)) {
@@ -168,8 +172,10 @@ final class DecodedBitStreamParser {
 
   private static void decodeAlphanumericSegment(BitSource bits,
                                                 StringBuffer result,
-                                                int count) {
+                                                int count,
+                                                boolean fc1InEffect) {
     // Read two characters at a time
+    int start = result.length();
     while (count > 1) {
       int nextTwoCharsBits = bits.readBits(11);
       result.append(ALPHANUMERIC_CHARS[nextTwoCharsBits / 45]);
@@ -180,6 +186,21 @@ final class DecodedBitStreamParser {
       // special case: one character left
       result.append(ALPHANUMERIC_CHARS[bits.readBits(6)]);
     }
+    // See section 6.4.8.1, 6.4.8.2
+    if (fc1InEffect) {
+      // We need to massage the result a bit if in an FNC1 mode:
+      for (int i = start; i < result.length(); i++) {
+        if (result.charAt(i) == '%') {
+          if (i < result.length() - 1 && result.charAt(i + 1) == '%') {
+            // %% is rendered as %
+            result.deleteCharAt(i + 1);
+          } else {
+            // In alpha mode, % should be converted to FNC1 separator 0x1D
+            result.setCharAt(i, (char) 0x1D);
+          }
+        }
+      }
+    }
   }
 
   private static void decodeNumericSegment(BitSource bits,

core/src/com/google/zxing/qrcode/decoder/Mode.java

@@ -34,6 +34,8 @@ final class Mode {
   static final Mode BYTE = new Mode(new int[]{8, 16, 16});
   static final Mode ECI = new Mode(null); // character counts don't apply
   static final Mode KANJI = new Mode(new int[]{8, 10, 12});
+  static final Mode FNC1_FIRST_POSITION = new Mode(null);
+  static final Mode FNC1_SECOND_POSITION = new Mode(null);
 
   private final int[] characterCountBitsForVersions;
 
@@ -56,12 +58,16 @@ final class Mode {
         return ALPHANUMERIC;
       case 0x4:
         return BYTE;
+      case 0x5:
+        return FNC1_FIRST_POSITION;
       case 0x7:
         return ECI;
       case 0x8:
         return KANJI;
+      case 0x9:
+        return FNC1_SECOND_POSITION;
       default:
-        throw new ReaderException("Illegal mode bits: " + bits);
+        throw new ReaderException("Unsupported mode bits: " + bits);
     }
   }
 
@@ -71,8 +77,8 @@ final class Mode {
    *         count of characters that will follow encoded in this {@link Mode}
    */
   int getCharacterCountBits(Version version) {
-    if (this.equals(ECI)) {
+    if (characterCountBitsForVersions == null) {
-      throw new IllegalArgumentException("Character count doesn't apply to ECI mode");
+      throw new IllegalArgumentException("Character count doesn't apply to this mode");
     }
     int number = version.getVersionNumber();
     int offset;