5 * Created by Christian Brunschen on 09/05/2008.
6 * Copyright 2008 Google UK. All rights reserved.
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
21 #include <zxing/common/BitArray.h>
28 static unsigned int logDigits(unsigned digits) {
31 while (val < digits) {
37 const unsigned int BitArray::bitsPerWord_ = numeric_limits<unsigned int>::digits;
38 const unsigned int BitArray::logBits_ = logDigits(bitsPerWord_);
39 const unsigned int BitArray::bitsMask_ = (1 << logBits_) - 1;
40 size_t BitArray::wordsForBits(size_t bits) {
41 int arraySize = bits >> logBits_;
42 if (bits - (arraySize << logBits_) != 0) {
48 BitArray::BitArray(size_t size) :
49 size_(size), bits_(wordsForBits(size), (const unsigned int)0) {
51 BitArray::~BitArray() {
53 size_t BitArray::getSize() {
56 bool BitArray::get(size_t i) {
57 return (bits_[i >> logBits_] & (1 << (i & bitsMask_))) != 0;
59 void BitArray::set(size_t i) {
60 bits_[i >> logBits_] |= 1 << (i & bitsMask_);
62 void BitArray::setBulk(size_t i, unsigned int newBits) {
63 bits_[i >> logBits_] = newBits;
65 void BitArray::clear() {
66 size_t max = bits_.size();
67 for (size_t i = 0; i < max; i++) {
71 bool BitArray::isRange(size_t start, size_t end, bool value) {
73 throw IllegalArgumentException("end must be after start");
78 // treat the 'end' as inclusive, rather than exclusive
80 size_t firstWord = start >> logBits_;
81 size_t lastWord = end >> logBits_;
82 for (size_t i = firstWord; i <= lastWord; i++) {
83 size_t firstBit = i > firstWord ? 0 : start & bitsMask_;
84 size_t lastBit = i < lastWord ? logBits_ : end & bitsMask_;
86 if (firstBit == 0 && lastBit == logBits_) {
87 mask = numeric_limits<unsigned int>::max();
90 for (size_t j = firstBit; j <= lastBit; j++) {
95 if ((bits_[i] & mask) != mask) {
99 if ((bits_[i] & mask) != 0) {
106 vector<unsigned int>& BitArray::getBitArray() {
109 void BitArray::reverse() {
110 std::vector<unsigned int> newBits(bits_.size(),(const unsigned int) 0);
111 for (size_t i = 0; i < size_; i++) {
112 if (get(size_ - i - 1)) {
113 newBits[i >> logBits_] |= 1<< (i & bitsMask_);