diff options
Diffstat (limited to 'libraries/zxing/src/com/google/zxing/qrcode/decoder/BitMatrixParser.java')
| -rw-r--r-- | libraries/zxing/src/com/google/zxing/qrcode/decoder/BitMatrixParser.java | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/libraries/zxing/src/com/google/zxing/qrcode/decoder/BitMatrixParser.java b/libraries/zxing/src/com/google/zxing/qrcode/decoder/BitMatrixParser.java deleted file mode 100644 index 9d131a554..000000000 --- a/libraries/zxing/src/com/google/zxing/qrcode/decoder/BitMatrixParser.java +++ /dev/null @@ -1,203 +0,0 @@ -/*
- * 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.
- */
-
-package com.google.zxing.qrcode.decoder;
-
-import com.google.zxing.FormatException;
-import com.google.zxing.common.BitMatrix;
-
-/**
- * @author Sean Owen
- */
-final class BitMatrixParser {
-
- private final BitMatrix bitMatrix;
- private Version parsedVersion;
- private FormatInformation parsedFormatInfo;
-
- /**
- * @param bitMatrix {@link BitMatrix} to parse
- * @throws FormatException if dimension is not >= 21 and 1 mod 4
- */
- BitMatrixParser(BitMatrix bitMatrix) throws FormatException {
- int dimension = bitMatrix.getHeight();
- if (dimension < 21 || (dimension & 0x03) != 1) {
- throw FormatException.getFormatInstance();
- }
- this.bitMatrix = bitMatrix;
- }
-
- /**
- * <p>Reads format information from one of its two locations within the QR Code.</p>
- *
- * @return {@link FormatInformation} encapsulating the QR Code's format info
- * @throws FormatException if both format information locations cannot be parsed as
- * the valid encoding of format information
- */
- FormatInformation readFormatInformation() throws FormatException {
-
- if (parsedFormatInfo != null) {
- return parsedFormatInfo;
- }
-
- // Read top-left format info bits
- int formatInfoBits1 = 0;
- for (int i = 0; i < 6; i++) {
- formatInfoBits1 = copyBit(i, 8, formatInfoBits1);
- }
- // .. and skip a bit in the timing pattern ...
- formatInfoBits1 = copyBit(7, 8, formatInfoBits1);
- formatInfoBits1 = copyBit(8, 8, formatInfoBits1);
- formatInfoBits1 = copyBit(8, 7, formatInfoBits1);
- // .. and skip a bit in the timing pattern ...
- for (int j = 5; j >= 0; j--) {
- formatInfoBits1 = copyBit(8, j, formatInfoBits1);
- }
-
- // Read the top-right/bottom-left pattern too
- int dimension = bitMatrix.getHeight();
- int formatInfoBits2 = 0;
- int jMin = dimension - 7;
- for (int j = dimension - 1; j >= jMin; j--) {
- formatInfoBits2 = copyBit(8, j, formatInfoBits2);
- }
- for (int i = dimension - 8; i < dimension; i++) {
- formatInfoBits2 = copyBit(i, 8, formatInfoBits2);
- }
-
- parsedFormatInfo = FormatInformation.decodeFormatInformation(formatInfoBits1, formatInfoBits2);
- if (parsedFormatInfo != null) {
- return parsedFormatInfo;
- }
- throw FormatException.getFormatInstance();
- }
-
- /**
- * <p>Reads version information from one of its two locations within the QR Code.</p>
- *
- * @return {@link Version} encapsulating the QR Code's version
- * @throws FormatException if both version information locations cannot be parsed as
- * the valid encoding of version information
- */
- Version readVersion() throws FormatException {
-
- if (parsedVersion != null) {
- return parsedVersion;
- }
-
- int dimension = bitMatrix.getHeight();
-
- int provisionalVersion = (dimension - 17) >> 2;
- if (provisionalVersion <= 6) {
- return Version.getVersionForNumber(provisionalVersion);
- }
-
- // Read top-right version info: 3 wide by 6 tall
- int versionBits = 0;
- int ijMin = dimension - 11;
- for (int j = 5; j >= 0; j--) {
- for (int i = dimension - 9; i >= ijMin; i--) {
- versionBits = copyBit(i, j, versionBits);
- }
- }
-
- parsedVersion = Version.decodeVersionInformation(versionBits);
- if (parsedVersion != null && parsedVersion.getDimensionForVersion() == dimension) {
- return parsedVersion;
- }
-
- // Hmm, failed. Try bottom left: 6 wide by 3 tall
- versionBits = 0;
- for (int i = 5; i >= 0; i--) {
- for (int j = dimension - 9; j >= ijMin; j--) {
- versionBits = copyBit(i, j, versionBits);
- }
- }
-
- parsedVersion = Version.decodeVersionInformation(versionBits);
- if (parsedVersion != null && parsedVersion.getDimensionForVersion() == dimension) {
- return parsedVersion;
- }
- throw FormatException.getFormatInstance();
- }
-
- private int copyBit(int i, int j, int versionBits) {
- return bitMatrix.get(i, j) ? (versionBits << 1) | 0x1 : versionBits << 1;
- }
-
- /**
- * <p>Reads the bits in the {@link BitMatrix} representing the finder pattern in the
- * correct order in order to reconstitute the codewords bytes contained within the
- * QR Code.</p>
- *
- * @return bytes encoded within the QR Code
- * @throws FormatException if the exact number of bytes expected is not read
- */
- byte[] readCodewords() throws FormatException {
-
- FormatInformation formatInfo = readFormatInformation();
- Version version = readVersion();
-
- // Get the data mask for the format used in this QR Code. This will exclude
- // some bits from reading as we wind through the bit matrix.
- DataMask dataMask = DataMask.forReference((int) formatInfo.getDataMask());
- int dimension = bitMatrix.getHeight();
- dataMask.unmaskBitMatrix(bitMatrix, dimension);
-
- BitMatrix functionPattern = version.buildFunctionPattern();
-
- boolean readingUp = true;
- byte[] result = new byte[version.getTotalCodewords()];
- int resultOffset = 0;
- int currentByte = 0;
- int bitsRead = 0;
- // Read columns in pairs, from right to left
- for (int j = dimension - 1; j > 0; j -= 2) {
- if (j == 6) {
- // Skip whole column with vertical alignment pattern;
- // saves time and makes the other code proceed more cleanly
- j--;
- }
- // Read alternatingly from bottom to top then top to bottom
- for (int count = 0; count < dimension; count++) {
- int i = readingUp ? dimension - 1 - count : count;
- for (int col = 0; col < 2; col++) {
- // Ignore bits covered by the function pattern
- if (!functionPattern.get(j - col, i)) {
- // Read a bit
- bitsRead++;
- currentByte <<= 1;
- if (bitMatrix.get(j - col, i)) {
- currentByte |= 1;
- }
- // If we've made a whole byte, save it off
- if (bitsRead == 8) {
- result[resultOffset++] = (byte) currentByte;
- bitsRead = 0;
- currentByte = 0;
- }
- }
- }
- }
- readingUp ^= true; // readingUp = !readingUp; // switch directions
- }
- if (resultOffset != version.getTotalCodewords()) {
- throw FormatException.getFormatInstance();
- }
- return result;
- }
-
-}
\ No newline at end of file |