@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
414 lines (413 loc) • 16.4 kB
JavaScript
import BitMatrix from '../../common/BitMatrix';
import Version from './Version';
import FormatException from '../../FormatException';
import IllegalArgumentException from '../../IllegalArgumentException';
/*
* Copyright 2007 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.
*/
/**
* @author bbrown@google.com (Brian Brown)
*/
export default class BitMatrixParser {
/**
* @param bitMatrix {@link BitMatrix} to parse
* @throws FormatException if dimension is < 8 or > 144 or not 0 mod 2
*/
constructor(bitMatrix) {
const dimension = bitMatrix.getHeight();
if (dimension < 8 || dimension > 144 || (dimension & 0x01) !== 0) {
throw new FormatException();
}
this.version = BitMatrixParser.readVersion(bitMatrix);
this.mappingBitMatrix = this.extractDataRegion(bitMatrix);
this.readMappingMatrix = new BitMatrix(this.mappingBitMatrix.getWidth(), this.mappingBitMatrix.getHeight());
}
getVersion() {
return this.version;
}
/**
* <p>Creates the version object based on the dimension of the original bit matrix from
* the datamatrix code.</p>
*
* <p>See ISO 16022:2006 Table 7 - ECC 200 symbol attributes</p>
*
* @param bitMatrix Original {@link BitMatrix} including alignment patterns
* @return {@link Version} encapsulating the Data Matrix Code's "version"
* @throws FormatException if the dimensions of the mapping matrix are not valid
* Data Matrix dimensions.
*/
static readVersion(bitMatrix) {
const numRows = bitMatrix.getHeight();
const numColumns = bitMatrix.getWidth();
return Version.getVersionForDimensions(numRows, numColumns);
}
/**
* <p>Reads the bits in the {@link BitMatrix} representing the mapping matrix (No alignment patterns)
* in the correct order in order to reconstitute the codewords bytes contained within the
* Data Matrix Code.</p>
*
* @return bytes encoded within the Data Matrix Code
* @throws FormatException if the exact number of bytes expected is not read
*/
readCodewords() {
const result = new Int8Array(this.version.getTotalCodewords());
let resultOffset = 0;
let row = 4;
let column = 0;
const numRows = this.mappingBitMatrix.getHeight();
const numColumns = this.mappingBitMatrix.getWidth();
let corner1Read = false;
let corner2Read = false;
let corner3Read = false;
let corner4Read = false;
// Read all of the codewords
do {
// Check the four corner cases
if ((row === numRows) && (column === 0) && !corner1Read) {
result[resultOffset++] = this.readCorner1(numRows, numColumns) & 0xff;
row -= 2;
column += 2;
corner1Read = true;
}
else if ((row === numRows - 2) && (column === 0) && ((numColumns & 0x03) !== 0) && !corner2Read) {
result[resultOffset++] = this.readCorner2(numRows, numColumns) & 0xff;
row -= 2;
column += 2;
corner2Read = true;
}
else if ((row === numRows + 4) && (column === 2) && ((numColumns & 0x07) === 0) && !corner3Read) {
result[resultOffset++] = this.readCorner3(numRows, numColumns) & 0xff;
row -= 2;
column += 2;
corner3Read = true;
}
else if ((row === numRows - 2) && (column === 0) && ((numColumns & 0x07) === 4) && !corner4Read) {
result[resultOffset++] = this.readCorner4(numRows, numColumns) & 0xff;
row -= 2;
column += 2;
corner4Read = true;
}
else {
// Sweep upward diagonally to the right
do {
if ((row < numRows) && (column >= 0) && !this.readMappingMatrix.get(column, row)) {
result[resultOffset++] = this.readUtah(row, column, numRows, numColumns) & 0xff;
}
row -= 2;
column += 2;
} while ((row >= 0) && (column < numColumns));
row += 1;
column += 3;
// Sweep downward diagonally to the left
do {
if ((row >= 0) && (column < numColumns) && !this.readMappingMatrix.get(column, row)) {
result[resultOffset++] = this.readUtah(row, column, numRows, numColumns) & 0xff;
}
row += 2;
column -= 2;
} while ((row < numRows) && (column >= 0));
row += 3;
column += 1;
}
} while ((row < numRows) || (column < numColumns));
if (resultOffset !== this.version.getTotalCodewords()) {
throw new FormatException();
}
return result;
}
/**
* <p>Reads a bit of the mapping matrix accounting for boundary wrapping.</p>
*
* @param row Row to read in the mapping matrix
* @param column Column to read in the mapping matrix
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return value of the given bit in the mapping matrix
*/
readModule(row, column, numRows, numColumns) {
// Adjust the row and column indices based on boundary wrapping
if (row < 0) {
row += numRows;
column += 4 - ((numRows + 4) & 0x07);
}
if (column < 0) {
column += numColumns;
row += 4 - ((numColumns + 4) & 0x07);
}
this.readMappingMatrix.set(column, row);
return this.mappingBitMatrix.get(column, row);
}
/**
* <p>Reads the 8 bits of the standard Utah-shaped pattern.</p>
*
* <p>See ISO 16022:2006, 5.8.1 Figure 6</p>
*
* @param row Current row in the mapping matrix, anchored at the 8th bit (LSB) of the pattern
* @param column Current column in the mapping matrix, anchored at the 8th bit (LSB) of the pattern
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return byte from the utah shape
*/
readUtah(row, column, numRows, numColumns) {
let currentByte = 0;
if (this.readModule(row - 2, column - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row - 2, column - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row - 1, column - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row - 1, column - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row - 1, column, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row, column - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row, column - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(row, column, numRows, numColumns)) {
currentByte |= 1;
}
return currentByte;
}
/**
* <p>Reads the 8 bits of the special corner condition 1.</p>
*
* <p>See ISO 16022:2006, Figure F.3</p>
*
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return byte from the Corner condition 1
*/
readCorner1(numRows, numColumns) {
let currentByte = 0;
if (this.readModule(numRows - 1, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 1, 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 1, 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(2, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(3, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
return currentByte;
}
/**
* <p>Reads the 8 bits of the special corner condition 2.</p>
*
* <p>See ISO 16022:2006, Figure F.4</p>
*
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return byte from the Corner condition 2
*/
readCorner2(numRows, numColumns) {
let currentByte = 0;
if (this.readModule(numRows - 3, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 2, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 1, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 4, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 3, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
return currentByte;
}
/**
* <p>Reads the 8 bits of the special corner condition 3.</p>
*
* <p>See ISO 16022:2006, Figure F.5</p>
*
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return byte from the Corner condition 3
*/
readCorner3(numRows, numColumns) {
let currentByte = 0;
if (this.readModule(numRows - 1, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 1, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 3, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 3, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
return currentByte;
}
/**
* <p>Reads the 8 bits of the special corner condition 4.</p>
*
* <p>See ISO 16022:2006, Figure F.6</p>
*
* @param numRows Number of rows in the mapping matrix
* @param numColumns Number of columns in the mapping matrix
* @return byte from the Corner condition 4
*/
readCorner4(numRows, numColumns) {
let currentByte = 0;
if (this.readModule(numRows - 3, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 2, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(numRows - 1, 0, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 2, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(0, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(1, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(2, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
currentByte <<= 1;
if (this.readModule(3, numColumns - 1, numRows, numColumns)) {
currentByte |= 1;
}
return currentByte;
}
/**
* <p>Extracts the data region from a {@link BitMatrix} that contains
* alignment patterns.</p>
*
* @param bitMatrix Original {@link BitMatrix} with alignment patterns
* @return BitMatrix that has the alignment patterns removed
*/
extractDataRegion(bitMatrix) {
const symbolSizeRows = this.version.getSymbolSizeRows();
const symbolSizeColumns = this.version.getSymbolSizeColumns();
if (bitMatrix.getHeight() !== symbolSizeRows) {
throw new IllegalArgumentException('Dimension of bitMatrix must match the version size');
}
const dataRegionSizeRows = this.version.getDataRegionSizeRows();
const dataRegionSizeColumns = this.version.getDataRegionSizeColumns();
const numDataRegionsRow = symbolSizeRows / dataRegionSizeRows | 0;
const numDataRegionsColumn = symbolSizeColumns / dataRegionSizeColumns | 0;
const sizeDataRegionRow = numDataRegionsRow * dataRegionSizeRows;
const sizeDataRegionColumn = numDataRegionsColumn * dataRegionSizeColumns;
const bitMatrixWithoutAlignment = new BitMatrix(sizeDataRegionColumn, sizeDataRegionRow);
for (let dataRegionRow = 0; dataRegionRow < numDataRegionsRow; ++dataRegionRow) {
const dataRegionRowOffset = dataRegionRow * dataRegionSizeRows;
for (let dataRegionColumn = 0; dataRegionColumn < numDataRegionsColumn; ++dataRegionColumn) {
const dataRegionColumnOffset = dataRegionColumn * dataRegionSizeColumns;
for (let i = 0; i < dataRegionSizeRows; ++i) {
const readRowOffset = dataRegionRow * (dataRegionSizeRows + 2) + 1 + i;
const writeRowOffset = dataRegionRowOffset + i;
for (let j = 0; j < dataRegionSizeColumns; ++j) {
const readColumnOffset = dataRegionColumn * (dataRegionSizeColumns + 2) + 1 + j;
if (bitMatrix.get(readColumnOffset, readRowOffset)) {
const writeColumnOffset = dataRegionColumnOffset + j;
bitMatrixWithoutAlignment.set(writeColumnOffset, writeRowOffset);
}
}
}
}
}
return bitMatrixWithoutAlignment;
}
}