#include <zxing/qrcode/FormatInformation.h>
#include <limits>
#include <zxing/common/Types.h>
namespace zxing {
namespace qrcode {
using namespace std;
int FormatInformation::FORMAT_INFO_MASK_QR = 0x5412;
int FormatInformation::FORMAT_INFO_DECODE_LOOKUP[][2] = { { 0x5412, 0x00 }, { 0x5125, 0x01 }, { 0x5E7C, 0x02 }, {
0x5B4B, 0x03 }, { 0x45F9, 0x04 }, { 0x40CE, 0x05 }, { 0x4F97, 0x06 }, { 0x4AA0, 0x07 }, { 0x77C4, 0x08 }, {
0x72F3, 0x09 }, { 0x7DAA, 0x0A }, { 0x789D, 0x0B }, { 0x662F, 0x0C }, { 0x6318, 0x0D }, { 0x6C41, 0x0E }, {
0x6976, 0x0F }, { 0x1689, 0x10 }, { 0x13BE, 0x11 }, { 0x1CE7, 0x12 }, { 0x19D0, 0x13 }, { 0x0762, 0x14 }, {
0x0255, 0x15 }, { 0x0D0C, 0x16 }, { 0x083B, 0x17 }, { 0x355F, 0x18 }, { 0x3068, 0x19 }, { 0x3F31, 0x1A }, {
0x3A06, 0x1B }, { 0x24B4, 0x1C }, { 0x2183, 0x1D }, { 0x2EDA, 0x1E }, { 0x2BED, 0x1F },
};
int FormatInformation::N_FORMAT_INFO_DECODE_LOOKUPS = 32;
int FormatInformation::BITS_SET_IN_HALF_BYTE[] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
FormatInformation::FormatInformation(int formatInfo) :
errorCorrectionLevel_(ErrorCorrectionLevel::forBits((formatInfo >> 3) & 0x03)), dataMask_((byte)(formatInfo & 0x07)) {
}
ErrorCorrectionLevel& FormatInformation::getErrorCorrectionLevel() {
return errorCorrectionLevel_;
}
char FormatInformation::getDataMask() {
return dataMask_;
}
int FormatInformation::numBitsDiffering(int a, int b) {
a ^= b;
return BITS_SET_IN_HALF_BYTE[a & 0x0F] + BITS_SET_IN_HALF_BYTE[(a >> 4 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 8
& 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 12 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 16 & 0x0F)]
+ BITS_SET_IN_HALF_BYTE[(a >> 20 & 0x0F)] + BITS_SET_IN_HALF_BYTE[(a >> 24 & 0x0F)]
+ BITS_SET_IN_HALF_BYTE[(a >> 28 & 0x0F)];
}
Ref<FormatInformation> FormatInformation::decodeFormatInformation(int maskedFormatInfo1, int maskedFormatInfo2) {
Ref<FormatInformation> result(doDecodeFormatInformation(maskedFormatInfo1, maskedFormatInfo2));
if (result != 0) {
return result;
}
return doDecodeFormatInformation(maskedFormatInfo1 ^ FORMAT_INFO_MASK_QR,
maskedFormatInfo2 ^ FORMAT_INFO_MASK_QR);
}
Ref<FormatInformation> FormatInformation::doDecodeFormatInformation(int maskedFormatInfo1, int maskedFormatInfo2) {
int bestDifference = numeric_limits<int>::max();
int bestFormatInfo = 0;
for (int i = 0; i < N_FORMAT_INFO_DECODE_LOOKUPS; i++) {
int* decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
int targetInfo = decodeInfo[0];
if (targetInfo == maskedFormatInfo1 || targetInfo == maskedFormatInfo2) {
Ref<FormatInformation> result(new FormatInformation(decodeInfo[1]));
return result;
}
int bitsDifference = numBitsDiffering(maskedFormatInfo1, targetInfo);
if (bitsDifference < bestDifference) {
bestFormatInfo = decodeInfo[1];
bestDifference = bitsDifference;
}
if (maskedFormatInfo1 != maskedFormatInfo2) {
bitsDifference = numBitsDiffering(maskedFormatInfo2, targetInfo);
if (bitsDifference < bestDifference) {
bestFormatInfo = decodeInfo[1];
bestDifference = bitsDifference;
}
}
}
if (bestDifference <= 3) {
Ref<FormatInformation> result(new FormatInformation(bestFormatInfo));
return result;
}
Ref<FormatInformation> result;
return result;
}
bool operator==(const FormatInformation &a, const FormatInformation &b) {
return &(a.errorCorrectionLevel_) == &(b.errorCorrectionLevel_) && a.dataMask_ == b.dataMask_;
}
ostream& operator<<(ostream& out, const FormatInformation& fi) {
const FormatInformation *fip = &fi;
out << "FormatInformation @ " << fip;
return out;
}
}
}