From 05cc2023daa57bfdb813e478ddb61c1b2f3156c4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= Date: Sat, 5 Oct 2013 20:43:42 +0200 Subject: Add parts of zxing library to generate qr codes --- .../src/com/google/zxing/common/BitArray.java | 246 +++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 OpenPGP-Keychain/src/com/google/zxing/common/BitArray.java (limited to 'OpenPGP-Keychain/src/com/google/zxing/common/BitArray.java') diff --git a/OpenPGP-Keychain/src/com/google/zxing/common/BitArray.java b/OpenPGP-Keychain/src/com/google/zxing/common/BitArray.java new file mode 100644 index 000000000..6eb0d57c6 --- /dev/null +++ b/OpenPGP-Keychain/src/com/google/zxing/common/BitArray.java @@ -0,0 +1,246 @@ +/* + * 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.common; + +/** + *

A simple, fast array of bits, represented compactly by an array of ints internally.

+ * + * @author Sean Owen + */ +public final class BitArray { + // I have changed these members to be public so ProGuard can inline get() and set(). Ideally + // they'd be private and we'd use the -allowaccessmodification flag, but Dalvik rejects the + // resulting binary at runtime on Android. If we find a solution to this, these should be changed + // back to private. + public int[] bits; + public int size; + + public BitArray() { + this.size = 0; + this.bits = new int[1]; + } + + public BitArray(int size) { + this.size = size; + this.bits = makeArray(size); + } + + public int getSize() { + return size; + } + + public int getSizeInBytes() { + return (size + 7) >> 3; + } + + private void ensureCapacity(int size) { + if (size > bits.length << 5) { + int[] newBits = makeArray(size); + System.arraycopy(bits, 0, newBits, 0, bits.length); + this.bits = newBits; + } + } + + /** + * @param i bit to get + * @return true iff bit i is set + */ + public boolean get(int i) { + return (bits[i >> 5] & (1 << (i & 0x1F))) != 0; + } + + /** + * Sets bit i. + * + * @param i bit to set + */ + public void set(int i) { + bits[i >> 5] |= 1 << (i & 0x1F); + } + + /** + * Flips bit i. + * + * @param i bit to set + */ + public void flip(int i) { + bits[i >> 5] ^= 1 << (i & 0x1F); + } + + /** + * Sets a block of 32 bits, starting at bit i. + * + * @param i first bit to set + * @param newBits the new value of the next 32 bits. Note again that the least-significant bit + * corresponds to bit i, the next-least-significant to i+1, and so on. + */ + public void setBulk(int i, int newBits) { + bits[i >> 5] = newBits; + } + + /** + * Clears all bits (sets to false). + */ + public void clear() { + int max = bits.length; + for (int i = 0; i < max; i++) { + bits[i] = 0; + } + } + + /** + * Efficient method to check if a range of bits is set, or not set. + * + * @param start start of range, inclusive. + * @param end end of range, exclusive + * @param value if true, checks that bits in range are set, otherwise checks that they are not set + * @return true iff all bits are set or not set in range, according to value argument + * @throws IllegalArgumentException if end is less than or equal to start + */ + public boolean isRange(int start, int end, boolean value) { + if (end < start) { + throw new IllegalArgumentException(); + } + if (end == start) { + return true; // empty range matches + } + end--; // will be easier to treat this as the last actually set bit -- inclusive + int firstInt = start >> 5; + int lastInt = end >> 5; + for (int i = firstInt; i <= lastInt; i++) { + int firstBit = i > firstInt ? 0 : start & 0x1F; + int lastBit = i < lastInt ? 31 : end & 0x1F; + int mask; + if (firstBit == 0 && lastBit == 31) { + mask = -1; + } else { + mask = 0; + for (int j = firstBit; j <= lastBit; j++) { + mask |= 1 << j; + } + } + + // Return false if we're looking for 1s and the masked bits[i] isn't all 1s (that is, + // equals the mask, or we're looking for 0s and the masked portion is not all 0s + if ((bits[i] & mask) != (value ? mask : 0)) { + return false; + } + } + return true; + } + + public void appendBit(boolean bit) { + ensureCapacity(size + 1); + if (bit) { + bits[size >> 5] |= (1 << (size & 0x1F)); + } + size++; + } + + /** + * Appends the least-significant bits, from value, in order from most-significant to + * least-significant. For example, appending 6 bits from 0x000001E will append the bits + * 0, 1, 1, 1, 1, 0 in that order. + */ + public void appendBits(int value, int numBits) { + if (numBits < 0 || numBits > 32) { + throw new IllegalArgumentException("Num bits must be between 0 and 32"); + } + ensureCapacity(size + numBits); + for (int numBitsLeft = numBits; numBitsLeft > 0; numBitsLeft--) { + appendBit(((value >> (numBitsLeft - 1)) & 0x01) == 1); + } + } + + public void appendBitArray(BitArray other) { + int otherSize = other.getSize(); + ensureCapacity(size + otherSize); + for (int i = 0; i < otherSize; i++) { + appendBit(other.get(i)); + } + } + + public void xor(BitArray other) { + if (bits.length != other.bits.length) { + throw new IllegalArgumentException("Sizes don't match"); + } + for (int i = 0; i < bits.length; i++) { + // The last byte could be incomplete (i.e. not have 8 bits in + // it) but there is no problem since 0 XOR 0 == 0. + bits[i] ^= other.bits[i]; + } + } + + /** + * + * @param bitOffset first bit to start writing + * @param array array to write into. Bytes are written most-significant byte first. This is the opposite + * of the internal representation, which is exposed by {@link #getBitArray()} + * @param offset position in array to start writing + * @param numBytes how many bytes to write + */ + public void toBytes(int bitOffset, byte[] array, int offset, int numBytes) { + for (int i = 0; i < numBytes; i++) { + int theByte = 0; + for (int j = 0; j < 8; j++) { + if (get(bitOffset)) { + theByte |= 1 << (7 - j); + } + bitOffset++; + } + array[offset + i] = (byte) theByte; + } + } + + /** + * @return underlying array of ints. The first element holds the first 32 bits, and the least + * significant bit is bit 0. + */ + public int[] getBitArray() { + return bits; + } + + /** + * Reverses all bits in the array. + */ + public void reverse() { + int[] newBits = new int[bits.length]; + int size = this.size; + for (int i = 0; i < size; i++) { + if (get(size - i - 1)) { + newBits[i >> 5] |= 1 << (i & 0x1F); + } + } + bits = newBits; + } + + private static int[] makeArray(int size) { + return new int[(size + 31) >> 5]; + } + + public String toString() { + StringBuffer result = new StringBuffer(size); + for (int i = 0; i < size; i++) { + if ((i & 0x07) == 0) { + result.append(' '); + } + result.append(get(i) ? 'X' : '.'); + } + return result.toString(); + } + +} \ No newline at end of file -- cgit v1.2.3