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/*
* Copyright (C) 2010 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.
*/
/*
* These authors would like to acknowledge the Spanish Ministry of Industry,
* Tourism and Trade, for the support in the project TSI020301-2008-2
* "PIRAmIDE: Personalizable Interactions with Resources on AmI-enabled
* Mobile Dynamic Environments", led by Treelogic
* ( http://www.treelogic.com/ ):
*
* http://www.piramidepse.com/
*/
package com.google.zxing.oned.rss.expanded.decoders;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.common.BitArray;
/**
* @author Pablo Orduña, University of Deusto ([email protected])
* @author Eduardo Castillejo, University of Deusto ([email protected])
*/
final class GeneralAppIdDecoder {
private final BitArray information;
private final CurrentParsingState current = new CurrentParsingState();
private final StringBuilder buffer = new StringBuilder();
GeneralAppIdDecoder(BitArray information) {
this.information = information;
}
String decodeAllCodes(StringBuilder buff, int initialPosition) throws NotFoundException, FormatException {
int currentPosition = initialPosition;
String remaining = null;
do {
DecodedInformation info = this.decodeGeneralPurposeField(currentPosition, remaining);
String parsedFields = FieldParser.parseFieldsInGeneralPurpose(info.getNewString());
if (parsedFields != null) {
buff.append(parsedFields);
}
if (info.isRemaining()) {
remaining = String.valueOf(info.getRemainingValue());
} else {
remaining = null;
}
if (currentPosition == info.getNewPosition()) { // No step forward!
break;
}
currentPosition = info.getNewPosition();
} while (true);
return buff.toString();
}
private boolean isStillNumeric(int pos) {
// It's numeric if it still has 7 positions
// and one of the first 4 bits is "1".
if (pos + 7 > this.information.getSize()) {
return pos + 4 <= this.information.getSize();
}
for (int i = pos; i < pos + 3; ++i) {
if (this.information.get(i)) {
return true;
}
}
return this.information.get(pos + 3);
}
private DecodedNumeric decodeNumeric(int pos) throws FormatException {
if (pos + 7 > this.information.getSize()) {
int numeric = extractNumericValueFromBitArray(pos, 4);
if (numeric == 0) {
return new DecodedNumeric(this.information.getSize(), DecodedNumeric.FNC1, DecodedNumeric.FNC1);
}
return new DecodedNumeric(this.information.getSize(), numeric - 1, DecodedNumeric.FNC1);
}
int numeric = extractNumericValueFromBitArray(pos, 7);
int digit1 = (numeric - 8) / 11;
int digit2 = (numeric - 8) % 11;
return new DecodedNumeric(pos + 7, digit1, digit2);
}
int extractNumericValueFromBitArray(int pos, int bits) {
return extractNumericValueFromBitArray(this.information, pos, bits);
}
static int extractNumericValueFromBitArray(BitArray information, int pos, int bits) {
int value = 0;
for (int i = 0; i < bits; ++i) {
if (information.get(pos + i)) {
value |= 1 << (bits - i - 1);
}
}
return value;
}
DecodedInformation decodeGeneralPurposeField(int pos, String remaining) throws FormatException {
this.buffer.setLength(0);
if (remaining != null) {
this.buffer.append(remaining);
}
this.current.setPosition(pos);
DecodedInformation lastDecoded = parseBlocks();
if (lastDecoded != null && lastDecoded.isRemaining()) {
return new DecodedInformation(this.current.getPosition(),
this.buffer.toString(), lastDecoded.getRemainingValue());
}
return new DecodedInformation(this.current.getPosition(), this.buffer.toString());
}
private DecodedInformation parseBlocks() throws FormatException {
boolean isFinished;
BlockParsedResult result;
do {
int initialPosition = current.getPosition();
if (current.isAlpha()) {
result = parseAlphaBlock();
isFinished = result.isFinished();
} else if (current.isIsoIec646()) {
result = parseIsoIec646Block();
isFinished = result.isFinished();
} else { // it must be numeric
result = parseNumericBlock();
isFinished = result.isFinished();
}
boolean positionChanged = initialPosition != current.getPosition();
if (!positionChanged && !isFinished) {
break;
}
} while (!isFinished);
return result.getDecodedInformation();
}
private BlockParsedResult parseNumericBlock() throws FormatException {
while (isStillNumeric(current.getPosition())) {
DecodedNumeric numeric = decodeNumeric(current.getPosition());
current.setPosition(numeric.getNewPosition());
if (numeric.isFirstDigitFNC1()) {
DecodedInformation information;
if (numeric.isSecondDigitFNC1()) {
information = new DecodedInformation(current.getPosition(), buffer.toString());
} else {
information = new DecodedInformation(current.getPosition(), buffer.toString(), numeric.getSecondDigit());
}
return new BlockParsedResult(information, true);
}
buffer.append(numeric.getFirstDigit());
if (numeric.isSecondDigitFNC1()) {
DecodedInformation information = new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true);
}
buffer.append(numeric.getSecondDigit());
}
if (isNumericToAlphaNumericLatch(current.getPosition())) {
current.setAlpha();
current.incrementPosition(4);
}
return new BlockParsedResult(false);
}
private BlockParsedResult parseIsoIec646Block() throws FormatException {
while (isStillIsoIec646(current.getPosition())) {
DecodedChar iso = decodeIsoIec646(current.getPosition());
current.setPosition(iso.getNewPosition());
if (iso.isFNC1()) {
DecodedInformation information = new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true);
}
buffer.append(iso.getValue());
}
if (isAlphaOr646ToNumericLatch(current.getPosition())) {
current.incrementPosition(3);
current.setNumeric();
} else if (isAlphaTo646ToAlphaLatch(current.getPosition())) {
if (current.getPosition() + 5 < this.information.getSize()) {
current.incrementPosition(5);
} else {
current.setPosition(this.information.getSize());
}
current.setAlpha();
}
return new BlockParsedResult(false);
}
private BlockParsedResult parseAlphaBlock() {
while (isStillAlpha(current.getPosition())) {
DecodedChar alpha = decodeAlphanumeric(current.getPosition());
current.setPosition(alpha.getNewPosition());
if (alpha.isFNC1()) {
DecodedInformation information = new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true); //end of the char block
}
buffer.append(alpha.getValue());
}
if (isAlphaOr646ToNumericLatch(current.getPosition())) {
current.incrementPosition(3);
current.setNumeric();
} else if (isAlphaTo646ToAlphaLatch(current.getPosition())) {
if (current.getPosition() + 5 < this.information.getSize()) {
current.incrementPosition(5);
} else {
current.setPosition(this.information.getSize());
}
current.setIsoIec646();
}
return new BlockParsedResult(false);
}
private boolean isStillIsoIec646(int pos) {
if (pos + 5 > this.information.getSize()) {
return false;
}
int fiveBitValue = extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue >= 5 && fiveBitValue < 16) {
return true;
}
if (pos + 7 > this.information.getSize()) {
return false;
}
int sevenBitValue = extractNumericValueFromBitArray(pos, 7);
if (sevenBitValue >= 64 && sevenBitValue < 116) {
return true;
}
if (pos + 8 > this.information.getSize()) {
return false;
}
int eightBitValue = extractNumericValueFromBitArray(pos, 8);
return eightBitValue >= 232 && eightBitValue < 253;
}
private DecodedChar decodeIsoIec646(int pos) throws FormatException {
int fiveBitValue = extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue == 15) {
return new DecodedChar(pos + 5, DecodedChar.FNC1);
}
if (fiveBitValue >= 5 && fiveBitValue < 15) {
return new DecodedChar(pos + 5, (char) ('0' + fiveBitValue - 5));
}
int sevenBitValue = extractNumericValueFromBitArray(pos, 7);
if (sevenBitValue >= 64 && sevenBitValue < 90) {
return new DecodedChar(pos + 7, (char) (sevenBitValue + 1));
}
if (sevenBitValue >= 90 && sevenBitValue < 116) {
return new DecodedChar(pos + 7, (char) (sevenBitValue + 7));
}
int eightBitValue = extractNumericValueFromBitArray(pos, 8);
char c;
switch (eightBitValue) {
case 232:
c = '!';
break;
case 233:
c = '"';
break;
case 234:
c = '%';
break;
case 235:
c = '&';
break;
case 236:
c = '\'';
break;
case 237:
c = '(';
break;
case 238:
c = ')';
break;
case 239:
c = '*';
break;
case 240:
c = '+';
break;
case 241:
c = ',';
break;
case 242:
c = '-';
break;
case 243:
c = '.';
break;
case 244:
c = '/';
break;
case 245:
c = ':';
break;
case 246:
c = ';';
break;
case 247:
c = '<';
break;
case 248:
c = '=';
break;
case 249:
c = '>';
break;
case 250:
c = '?';
break;
case 251:
c = '_';
break;
case 252:
c = ' ';
break;
default:
throw FormatException.getFormatInstance();
}
return new DecodedChar(pos + 8, c);
}
private boolean isStillAlpha(int pos) {
if (pos + 5 > this.information.getSize()) {
return false;
}
// We now check if it's a valid 5-bit value (0..9 and FNC1)
int fiveBitValue = extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue >= 5 && fiveBitValue < 16) {
return true;
}
if (pos + 6 > this.information.getSize()) {
return false;
}
int sixBitValue = extractNumericValueFromBitArray(pos, 6);
return sixBitValue >= 16 && sixBitValue < 63; // 63 not included
}
private DecodedChar decodeAlphanumeric(int pos) {
int fiveBitValue = extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue == 15) {
return new DecodedChar(pos + 5, DecodedChar.FNC1);
}
if (fiveBitValue >= 5 && fiveBitValue < 15) {
return new DecodedChar(pos + 5, (char) ('0' + fiveBitValue - 5));
}
int sixBitValue = extractNumericValueFromBitArray(pos, 6);
if (sixBitValue >= 32 && sixBitValue < 58) {
return new DecodedChar(pos + 6, (char) (sixBitValue + 33));
}
char c;
switch (sixBitValue) {
case 58:
c = '*';
break;
case 59:
c = ',';
break;
case 60:
c = '-';
break;
case 61:
c = '.';
break;
case 62:
c = '/';
break;
default:
throw new IllegalStateException("Decoding invalid alphanumeric value: " + sixBitValue);
}
return new DecodedChar(pos + 6, c);
}
private boolean isAlphaTo646ToAlphaLatch(int pos) {
if (pos + 1 > this.information.getSize()) {
return false;
}
for (int i = 0; i < 5 && i + pos < this.information.getSize(); ++i) {
if (i == 2) {
if (!this.information.get(pos + 2)) {
return false;
}
} else if (this.information.get(pos + i)) {
return false;
}
}
return true;
}
private boolean isAlphaOr646ToNumericLatch(int pos) {
// Next is alphanumeric if there are 3 positions and they are all zeros
if (pos + 3 > this.information.getSize()) {
return false;
}
for (int i = pos; i < pos + 3; ++i) {
if (this.information.get(i)) {
return false;
}
}
return true;
}
private boolean isNumericToAlphaNumericLatch(int pos) {
// Next is alphanumeric if there are 4 positions and they are all zeros, or
// if there is a subset of this just before the end of the symbol
if (pos + 1 > this.information.getSize()) {
return false;
}
for (int i = 0; i < 4 && i + pos < this.information.getSize(); ++i) {
if (this.information.get(pos + i)) {
return false;
}
}
return true;
}
}
