2 * FormatInformation.cpp
5 * Created by Christian Brunschen on 18/05/2008.
6 * Copyright 2008 ZXing authors 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/qrcode/FormatInformation.h>
29 int FormatInformation::FORMAT_INFO_MASK_QR = 0x5412;
30 int FormatInformation::FORMAT_INFO_DECODE_LOOKUP[][2] = { { 0x5412, 0x00 }, { 0x5125, 0x01 }, { 0x5E7C, 0x02 }, {
31 0x5B4B, 0x03 }, { 0x45F9, 0x04 }, { 0x40CE, 0x05 }, { 0x4F97, 0x06 }, { 0x4AA0, 0x07 }, { 0x77C4, 0x08 }, {
32 0x72F3, 0x09 }, { 0x7DAA, 0x0A }, { 0x789D, 0x0B }, { 0x662F, 0x0C }, { 0x6318, 0x0D }, { 0x6C41, 0x0E }, {
33 0x6976, 0x0F }, { 0x1689, 0x10 }, { 0x13BE, 0x11 }, { 0x1CE7, 0x12 }, { 0x19D0, 0x13 }, { 0x0762, 0x14 }, {
34 0x0255, 0x15 }, { 0x0D0C, 0x16 }, { 0x083B, 0x17 }, { 0x355F, 0x18 }, { 0x3068, 0x19 }, { 0x3F31, 0x1A }, {
35 0x3A06, 0x1B }, { 0x24B4, 0x1C }, { 0x2183, 0x1D }, { 0x2EDA, 0x1E }, { 0x2BED, 0x1F },
37 int FormatInformation::N_FORMAT_INFO_DECODE_LOOKUPS = 32;
39 int FormatInformation::BITS_SET_IN_HALF_BYTE[] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
41 FormatInformation::FormatInformation(int formatInfo) :
42 errorCorrectionLevel_(ErrorCorrectionLevel::forBits((formatInfo >> 3) & 0x03)), dataMask_(
43 (unsigned char)(formatInfo & 0x07)) {
46 ErrorCorrectionLevel& FormatInformation::getErrorCorrectionLevel() {
47 return errorCorrectionLevel_;
50 unsigned char FormatInformation::getDataMask() {
54 int FormatInformation::numBitsDiffering(unsigned int a, unsigned int b) {
56 return BITS_SET_IN_HALF_BYTE[a & 0x0F] + BITS_SET_IN_HALF_BYTE[(a >> 4 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 8
57 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 12 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 16 & 0x0F)]
58 + BITS_SET_IN_HALF_BYTE[(a >> 20 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 24 & 0x0F)]
59 + BITS_SET_IN_HALF_BYTE[(a >> 28 & 0x0F)];
62 Ref<FormatInformation> FormatInformation::decodeFormatInformation(int rawFormatInfo) {
63 Ref<FormatInformation> result(doDecodeFormatInformation(rawFormatInfo));
67 return doDecodeFormatInformation(rawFormatInfo ^ FORMAT_INFO_MASK_QR);
69 Ref<FormatInformation> FormatInformation::doDecodeFormatInformation(int rawFormatInfo) {
71 int unmaskedFormatInfo = rawFormatInfo ^ FORMAT_INFO_MASK_QR;
72 // Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing
73 int bestDifference = numeric_limits<int>::max();
74 int bestFormatInfo = 0;
75 for (int i = 0; i < N_FORMAT_INFO_DECODE_LOOKUPS; i++) {
76 int* decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
77 int targetInfo = decodeInfo[0];
78 if (targetInfo == unmaskedFormatInfo) {
79 // Found an exact match
80 Ref<FormatInformation> result(new FormatInformation(decodeInfo[1]));
83 int bitsDifference = numBitsDiffering(unmaskedFormatInfo, targetInfo);
84 if (bitsDifference < bestDifference) {
85 bestFormatInfo = decodeInfo[1];
86 bestDifference = bitsDifference;
89 if (bestDifference <= 3) {
90 Ref<FormatInformation> result(new FormatInformation(bestFormatInfo));
93 Ref<FormatInformation> result;
97 bool operator==(const FormatInformation &a, const FormatInformation &b) {
98 return &(a.errorCorrectionLevel_) == &(b.errorCorrectionLevel_) && a.dataMask_ == b.dataMask_;
101 ostream& operator<<(ostream& out, const FormatInformation& fi) {
102 const FormatInformation *fip = &fi;
103 out << "FormatInformation @ " << fip;