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authorDominik Schürmann <dominik@dominikschuermann.de>2014-01-12 15:50:09 -0800
committerDominik Schürmann <dominik@dominikschuermann.de>2014-01-12 15:50:09 -0800
commit92aa5b36bba57e4927f146d49c9f124a37b7b5f9 (patch)
tree865d3962e54225fc4f13e0d19852ddc061e7e05f /OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java
parent536c4db48f12287eaf1875e2d208c0ad07e31ee6 (diff)
parente3bcf64d9e63e293c51db921572a9b87533d26ad (diff)
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Merge pull request #179 from dschuermann/key-details
Key details
Diffstat (limited to 'OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java')
-rw-r--r--OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java322
1 files changed, 0 insertions, 322 deletions
diff --git a/OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java b/OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java
deleted file mode 100644
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--- a/OpenPGP-Keychain/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java
+++ /dev/null
@@ -1,322 +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.BitSource;
-import com.google.zxing.common.CharacterSetECI;
-import com.google.zxing.common.DecoderResult;
-import com.google.zxing.common.StringUtils;
-
-import java.io.UnsupportedEncodingException;
-import java.util.Hashtable;
-import java.util.Vector;
-
-/**
- * <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
- * in one QR Code. This class decodes the bits back into text.</p>
- *
- * <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
- *
- * @author Sean Owen
- */
-final class DecodedBitStreamParser {
-
- /**
- * See ISO 18004:2006, 6.4.4 Table 5
- */
- private static final char[] ALPHANUMERIC_CHARS = {
- '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
- 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
- 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
- ' ', '$', '%', '*', '+', '-', '.', '/', ':'
- };
- private static final int GB2312_SUBSET = 1;
-
- private DecodedBitStreamParser() {
- }
-
- static DecoderResult decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, Hashtable hints)
- throws FormatException {
- BitSource bits = new BitSource(bytes);
- StringBuffer result = new StringBuffer(50);
- CharacterSetECI currentCharacterSetECI = null;
- boolean fc1InEffect = false;
- Vector byteSegments = new Vector(1);
- Mode mode;
- do {
- // While still another segment to read...
- if (bits.available() < 4) {
- // OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
- mode = Mode.TERMINATOR;
- } else {
- try {
- mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
- } catch (IllegalArgumentException iae) {
- throw FormatException.getFormatInstance();
- }
- }
- if (!mode.equals(Mode.TERMINATOR)) {
- 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.STRUCTURED_APPEND)) {
- // not really supported; all we do is ignore it
- // Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
- bits.readBits(16);
- } else if (mode.equals(Mode.ECI)) {
- // Count doesn't apply to ECI
- int value = parseECIValue(bits);
- currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
- if (currentCharacterSetECI == null) {
- throw FormatException.getFormatInstance();
- }
- } else {
- // First handle Hanzi mode which does not start with character count
- if (mode.equals(Mode.HANZI)) {
- //chinese mode contains a sub set indicator right after mode indicator
- int subset = bits.readBits(4);
- int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
- if (subset == GB2312_SUBSET) {
- decodeHanziSegment(bits, result, countHanzi);
- }
- } else {
- // "Normal" QR code modes:
- // How many characters will follow, encoded in this mode?
- int count = bits.readBits(mode.getCharacterCountBits(version));
- if (mode.equals(Mode.NUMERIC)) {
- decodeNumericSegment(bits, result, count);
- } else if (mode.equals(Mode.ALPHANUMERIC)) {
- decodeAlphanumericSegment(bits, result, count, fc1InEffect);
- } else if (mode.equals(Mode.BYTE)) {
- decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints);
- } else if (mode.equals(Mode.KANJI)) {
- decodeKanjiSegment(bits, result, count);
- } else {
- throw FormatException.getFormatInstance();
- }
- }
- }
- }
- } while (!mode.equals(Mode.TERMINATOR));
-
- return new DecoderResult(bytes,
- result.toString(),
- byteSegments.isEmpty() ? null : byteSegments,
- ecLevel == null ? null : ecLevel.toString());
- }
-
- /**
- * See specification GBT 18284-2000
- */
- private static void decodeHanziSegment(BitSource bits,
- StringBuffer result,
- int count) throws FormatException {
- // Don't crash trying to read more bits than we have available.
- if (count * 13 > bits.available()) {
- throw FormatException.getFormatInstance();
- }
-
- // Each character will require 2 bytes. Read the characters as 2-byte pairs
- // and decode as GB2312 afterwards
- byte[] buffer = new byte[2 * count];
- int offset = 0;
- while (count > 0) {
- // Each 13 bits encodes a 2-byte character
- int twoBytes = bits.readBits(13);
- int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
- if (assembledTwoBytes < 0x003BF) {
- // In the 0xA1A1 to 0xAAFE range
- assembledTwoBytes += 0x0A1A1;
- } else {
- // In the 0xB0A1 to 0xFAFE range
- assembledTwoBytes += 0x0A6A1;
- }
- buffer[offset] = (byte) ((assembledTwoBytes >> 8) & 0xFF);
- buffer[offset + 1] = (byte) (assembledTwoBytes & 0xFF);
- offset += 2;
- count--;
- }
-
- try {
- result.append(new String(buffer, StringUtils.GB2312));
- } catch (UnsupportedEncodingException uee) {
- throw FormatException.getFormatInstance();
- }
- }
-
- private static void decodeKanjiSegment(BitSource bits,
- StringBuffer result,
- int count) throws FormatException {
- // Don't crash trying to read more bits than we have available.
- if (count * 13 > bits.available()) {
- throw FormatException.getFormatInstance();
- }
-
- // Each character will require 2 bytes. Read the characters as 2-byte pairs
- // and decode as Shift_JIS afterwards
- byte[] buffer = new byte[2 * count];
- int offset = 0;
- while (count > 0) {
- // Each 13 bits encodes a 2-byte character
- int twoBytes = bits.readBits(13);
- int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
- if (assembledTwoBytes < 0x01F00) {
- // In the 0x8140 to 0x9FFC range
- assembledTwoBytes += 0x08140;
- } else {
- // In the 0xE040 to 0xEBBF range
- assembledTwoBytes += 0x0C140;
- }
- buffer[offset] = (byte) (assembledTwoBytes >> 8);
- buffer[offset + 1] = (byte) assembledTwoBytes;
- offset += 2;
- count--;
- }
- // Shift_JIS may not be supported in some environments:
- try {
- result.append(new String(buffer, StringUtils.SHIFT_JIS));
- } catch (UnsupportedEncodingException uee) {
- throw FormatException.getFormatInstance();
- }
- }
-
- private static void decodeByteSegment(BitSource bits,
- StringBuffer result,
- int count,
- CharacterSetECI currentCharacterSetECI,
- Vector byteSegments,
- Hashtable hints) throws FormatException {
- // Don't crash trying to read more bits than we have available.
- if (count << 3 > bits.available()) {
- throw FormatException.getFormatInstance();
- }
-
- byte[] readBytes = new byte[count];
- for (int i = 0; i < count; i++) {
- readBytes[i] = (byte) bits.readBits(8);
- }
- String encoding;
- if (currentCharacterSetECI == null) {
- // The spec isn't clear on this mode; see
- // section 6.4.5: t does not say which encoding to assuming
- // upon decoding. I have seen ISO-8859-1 used as well as
- // Shift_JIS -- without anything like an ECI designator to
- // give a hint.
- encoding = StringUtils.guessEncoding(readBytes, hints);
- } else {
- encoding = currentCharacterSetECI.getEncodingName();
- }
- try {
- result.append(new String(readBytes, encoding));
- } catch (UnsupportedEncodingException uce) {
- throw FormatException.getFormatInstance();
- }
- byteSegments.addElement(readBytes);
- }
-
- private static char toAlphaNumericChar(int value) throws FormatException {
- if (value >= ALPHANUMERIC_CHARS.length) {
- throw FormatException.getFormatInstance();
- }
- return ALPHANUMERIC_CHARS[value];
- }
-
- private static void decodeAlphanumericSegment(BitSource bits,
- StringBuffer result,
- int count,
- boolean fc1InEffect) throws FormatException {
- // Read two characters at a time
- int start = result.length();
- while (count > 1) {
- int nextTwoCharsBits = bits.readBits(11);
- result.append(toAlphaNumericChar(nextTwoCharsBits / 45));
- result.append(toAlphaNumericChar(nextTwoCharsBits % 45));
- count -= 2;
- }
- if (count == 1) {
- // special case: one character left
- result.append(toAlphaNumericChar(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,
- StringBuffer result,
- int count) throws FormatException {
- // Read three digits at a time
- while (count >= 3) {
- // Each 10 bits encodes three digits
- int threeDigitsBits = bits.readBits(10);
- if (threeDigitsBits >= 1000) {
- throw FormatException.getFormatInstance();
- }
- result.append(toAlphaNumericChar(threeDigitsBits / 100));
- result.append(toAlphaNumericChar((threeDigitsBits / 10) % 10));
- result.append(toAlphaNumericChar(threeDigitsBits % 10));
- count -= 3;
- }
- if (count == 2) {
- // Two digits left over to read, encoded in 7 bits
- int twoDigitsBits = bits.readBits(7);
- if (twoDigitsBits >= 100) {
- throw FormatException.getFormatInstance();
- }
- result.append(toAlphaNumericChar(twoDigitsBits / 10));
- result.append(toAlphaNumericChar(twoDigitsBits % 10));
- } else if (count == 1) {
- // One digit left over to read
- int digitBits = bits.readBits(4);
- if (digitBits >= 10) {
- throw FormatException.getFormatInstance();
- }
- result.append(toAlphaNumericChar(digitBits));
- }
- }
-
- private static int parseECIValue(BitSource bits) {
- int firstByte = bits.readBits(8);
- if ((firstByte & 0x80) == 0) {
- // just one byte
- return firstByte & 0x7F;
- } else if ((firstByte & 0xC0) == 0x80) {
- // two bytes
- int secondByte = bits.readBits(8);
- return ((firstByte & 0x3F) << 8) | secondByte;
- } else if ((firstByte & 0xE0) == 0xC0) {
- // three bytes
- int secondThirdBytes = bits.readBits(16);
- return ((firstByte & 0x1F) << 16) | secondThirdBytes;
- }
- throw new IllegalArgumentException("Bad ECI bits starting with byte " + firstByte);
- }
-
-}
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