@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
388 lines (387 loc) • 15 kB
JavaScript
import FormatException from '../../../../FormatException';
import IllegalStateException from '../../../../IllegalStateException';
import StringBuilder from '../../../../util/StringBuilder';
import BlockParsedResult from './BlockParsedResult';
import DecodedChar from './DecodedChar';
import DecodedInformation from './DecodedInformation';
import DecodedNumeric from './DecodedNumeric';
import FieldParser from './FieldParser';
var GeneralAppIdDecoder = /** @class */ (function () {
function GeneralAppIdDecoder(information) {
this.buffer = new StringBuilder();
this.information = information;
}
GeneralAppIdDecoder.prototype.decodeAllCodes = function (buff, initialPosition) {
var currentPosition = initialPosition;
var remaining = null;
do {
var info = this.decodeGeneralPurposeField(currentPosition, remaining);
var parsedFields = FieldParser.parseFieldsInGeneralPurpose(info.getNewString());
if (parsedFields != null) {
buff.append(parsedFields);
}
if (info.isRemaining()) {
remaining = '' + info.getRemainingValue();
}
else {
remaining = null;
}
if (currentPosition === info.getNewPosition()) { // No step forward!
break;
}
currentPosition = info.getNewPosition();
} while (true);
return buff.toString();
};
GeneralAppIdDecoder.prototype.isStillNumeric = function (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 (var i = pos; i < pos + 3; ++i) {
if (this.information.get(i)) {
return true;
}
}
return this.information.get(pos + 3);
};
GeneralAppIdDecoder.prototype.decodeNumeric = function (pos) {
if (pos + 7 > this.information.getSize()) {
var numeric_1 = this.extractNumericValueFromBitArray(pos, 4);
if (numeric_1 === 0) {
return new DecodedNumeric(this.information.getSize(), DecodedNumeric.FNC1, DecodedNumeric.FNC1);
}
return new DecodedNumeric(this.information.getSize(), numeric_1 - 1, DecodedNumeric.FNC1);
}
var numeric = this.extractNumericValueFromBitArray(pos, 7);
var digit1 = (numeric - 8) / 11;
var digit2 = (numeric - 8) % 11;
return new DecodedNumeric(pos + 7, digit1, digit2);
};
GeneralAppIdDecoder.prototype.extractNumericValueFromBitArray = function (pos, bits) {
return GeneralAppIdDecoder.extractNumericValueFromBitArray(this.information, pos, bits);
};
GeneralAppIdDecoder.extractNumericValueFromBitArray = function (information, pos, bits) {
var value = 0;
for (var i = 0; i < bits; ++i) {
if (information.get(pos + i)) {
value |= 1 << (bits - i - 1);
}
}
return value;
};
GeneralAppIdDecoder.prototype.decodeGeneralPurposeField = function (pos, remaining) {
// this.buffer.setLength(0);
this.buffer.setLengthToZero();
if (remaining != null) {
this.buffer.append(remaining);
}
this.current.setPosition(pos);
var lastDecoded = this.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());
};
GeneralAppIdDecoder.prototype.parseBlocks = function () {
var isFinished;
var result;
do {
var initialPosition = this.current.getPosition();
if (this.current.isAlpha()) {
result = this.parseAlphaBlock();
isFinished = result.isFinished();
}
else if (this.current.isIsoIec646()) {
result = this.parseIsoIec646Block();
isFinished = result.isFinished();
}
else { // it must be numeric
result = this.parseNumericBlock();
isFinished = result.isFinished();
}
var positionChanged = initialPosition !== this.current.getPosition();
if (!positionChanged && !isFinished) {
break;
}
} while (!isFinished);
return result.getDecodedInformation();
};
GeneralAppIdDecoder.prototype.parseNumericBlock = function () {
while (this.isStillNumeric(this.current.getPosition())) {
var numeric = this.decodeNumeric(this.current.getPosition());
this.current.setPosition(numeric.getNewPosition());
if (numeric.isFirstDigitFNC1()) {
var information = void 0;
if (numeric.isSecondDigitFNC1()) {
information = new DecodedInformation(this.current.getPosition(), this.buffer.toString());
}
else {
information = new DecodedInformation(this.current.getPosition(), this.buffer.toString(), numeric.getSecondDigit());
}
return new BlockParsedResult(true, information);
}
this.buffer.append(numeric.getFirstDigit());
if (numeric.isSecondDigitFNC1()) {
var information = new DecodedInformation(this.current.getPosition(), this.buffer.toString());
return new BlockParsedResult(true, information);
}
this.buffer.append(numeric.getSecondDigit());
}
if (this.isNumericToAlphaNumericLatch(this.current.getPosition())) {
this.current.setAlpha();
this.current.incrementPosition(4);
}
return new BlockParsedResult(false);
};
GeneralAppIdDecoder.prototype.parseIsoIec646Block = function () {
while (this.isStillIsoIec646(this.current.getPosition())) {
var iso = this.decodeIsoIec646(this.current.getPosition());
this.current.setPosition(iso.getNewPosition());
if (iso.isFNC1()) {
var information = new DecodedInformation(this.current.getPosition(), this.buffer.toString());
return new BlockParsedResult(true, information);
}
this.buffer.append(iso.getValue());
}
if (this.isAlphaOr646ToNumericLatch(this.current.getPosition())) {
this.current.incrementPosition(3);
this.current.setNumeric();
}
else if (this.isAlphaTo646ToAlphaLatch(this.current.getPosition())) {
if (this.current.getPosition() + 5 < this.information.getSize()) {
this.current.incrementPosition(5);
}
else {
this.current.setPosition(this.information.getSize());
}
this.current.setAlpha();
}
return new BlockParsedResult(false);
};
GeneralAppIdDecoder.prototype.parseAlphaBlock = function () {
while (this.isStillAlpha(this.current.getPosition())) {
var alpha = this.decodeAlphanumeric(this.current.getPosition());
this.current.setPosition(alpha.getNewPosition());
if (alpha.isFNC1()) {
var information = new DecodedInformation(this.current.getPosition(), this.buffer.toString());
return new BlockParsedResult(true, information); // end of the char block
}
this.buffer.append(alpha.getValue());
}
if (this.isAlphaOr646ToNumericLatch(this.current.getPosition())) {
this.current.incrementPosition(3);
this.current.setNumeric();
}
else if (this.isAlphaTo646ToAlphaLatch(this.current.getPosition())) {
if (this.current.getPosition() + 5 < this.information.getSize()) {
this.current.incrementPosition(5);
}
else {
this.current.setPosition(this.information.getSize());
}
this.current.setIsoIec646();
}
return new BlockParsedResult(false);
};
GeneralAppIdDecoder.prototype.isStillIsoIec646 = function (pos) {
if (pos + 5 > this.information.getSize()) {
return false;
}
var fiveBitValue = this.extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue >= 5 && fiveBitValue < 16) {
return true;
}
if (pos + 7 > this.information.getSize()) {
return false;
}
var sevenBitValue = this.extractNumericValueFromBitArray(pos, 7);
if (sevenBitValue >= 64 && sevenBitValue < 116) {
return true;
}
if (pos + 8 > this.information.getSize()) {
return false;
}
var eightBitValue = this.extractNumericValueFromBitArray(pos, 8);
return eightBitValue >= 232 && eightBitValue < 253;
};
GeneralAppIdDecoder.prototype.decodeIsoIec646 = function (pos) {
var fiveBitValue = this.extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue === 15) {
return new DecodedChar(pos + 5, DecodedChar.FNC1);
}
if (fiveBitValue >= 5 && fiveBitValue < 15) {
return new DecodedChar(pos + 5, ('0' + (fiveBitValue - 5)));
}
var sevenBitValue = this.extractNumericValueFromBitArray(pos, 7);
if (sevenBitValue >= 64 && sevenBitValue < 90) {
return new DecodedChar(pos + 7, ('' + (sevenBitValue + 1)));
}
if (sevenBitValue >= 90 && sevenBitValue < 116) {
return new DecodedChar(pos + 7, ('' + (sevenBitValue + 7)));
}
var eightBitValue = this.extractNumericValueFromBitArray(pos, 8);
var 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 new FormatException();
}
return new DecodedChar(pos + 8, c);
};
GeneralAppIdDecoder.prototype.isStillAlpha = function (pos) {
if (pos + 5 > this.information.getSize()) {
return false;
}
// We now check if it's a valid 5-bit value (0..9 and FNC1)
var fiveBitValue = this.extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue >= 5 && fiveBitValue < 16) {
return true;
}
if (pos + 6 > this.information.getSize()) {
return false;
}
var sixBitValue = this.extractNumericValueFromBitArray(pos, 6);
return sixBitValue >= 16 && sixBitValue < 63; // 63 not included
};
GeneralAppIdDecoder.prototype.decodeAlphanumeric = function (pos) {
var fiveBitValue = this.extractNumericValueFromBitArray(pos, 5);
if (fiveBitValue === 15) {
return new DecodedChar(pos + 5, DecodedChar.FNC1);
}
if (fiveBitValue >= 5 && fiveBitValue < 15) {
return new DecodedChar(pos + 5, ('0' + (fiveBitValue - 5)));
}
var sixBitValue = this.extractNumericValueFromBitArray(pos, 6);
if (sixBitValue >= 32 && sixBitValue < 58) {
return new DecodedChar(pos + 6, ('' + (sixBitValue + 33)));
}
var 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);
};
GeneralAppIdDecoder.prototype.isAlphaTo646ToAlphaLatch = function (pos) {
if (pos + 1 > this.information.getSize()) {
return false;
}
for (var 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;
};
GeneralAppIdDecoder.prototype.isAlphaOr646ToNumericLatch = function (pos) {
// Next is alphanumeric if there are 3 positions and they are all zeros
if (pos + 3 > this.information.getSize()) {
return false;
}
for (var i = pos; i < pos + 3; ++i) {
if (this.information.get(i)) {
return false;
}
}
return true;
};
GeneralAppIdDecoder.prototype.isNumericToAlphaNumericLatch = function (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 (var i = 0; i < 4 && i + pos < this.information.getSize(); ++i) {
if (this.information.get(pos + i)) {
return false;
}
}
return true;
};
return GeneralAppIdDecoder;
}());
export default GeneralAppIdDecoder;