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Changed and simplified C++ code by converting Ecc from class to enum, updated related code.

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This commit is contained in:
Project Nayuki 2018-02-26 19:53:57 +00:00
parent 6b33f4fd9c
commit 3208954e81
3 changed files with 25 additions and 44 deletions
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36
cpp/QrCode.cpp
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@ -38,27 +38,17 @@ using std::vector;
namespace qrcodegen {
QrCode::Ecc::Ecc(int ord, int fb) :
ordinal(ord),
formatBits(fb) {}
int QrCode::Ecc::getOrdinal() const {
return ordinal;
int QrCode::getFormatBits(Ecc ecl) {
switch (ecl) {
case Ecc::LOW : return 1;
case Ecc::MEDIUM : return 0;
case Ecc::QUARTILE: return 3;
case Ecc::HIGH : return 2;
default: throw "Assertion error";
}
}
int QrCode::Ecc::getFormatBits() const {
return formatBits;
}
const QrCode::Ecc QrCode::Ecc::LOW (0, 1);
const QrCode::Ecc QrCode::Ecc::MEDIUM (1, 0);
const QrCode::Ecc QrCode::Ecc::QUARTILE(2, 3);
const QrCode::Ecc QrCode::Ecc::HIGH (3, 2);
QrCode QrCode::encodeText(const char *text, Ecc ecl) {
vector<QrSegment> segs(QrSegment::makeSegments(text));
return encodeSegments(segs, ecl);
@ -224,7 +214,7 @@ void QrCode::drawFunctionPatterns() {
void QrCode::drawFormatBits(int mask) {
// Calculate error correction code and pack bits
int data = errorCorrectionLevel.getFormatBits() << 3 | mask; // errCorrLvl is uint2, mask is uint3
int data = getFormatBits(errorCorrectionLevel) << 3 | mask; // errCorrLvl is uint2, mask is uint3
int rem = data;
for (int i = 0; i < 10; i++)
rem = (rem << 1) ^ ((rem >> 9) * 0x537);
@ -309,8 +299,8 @@ vector<uint8_t> QrCode::appendErrorCorrection(const vector<uint8_t> &data) const
throw "Invalid argument";
// Calculate parameter numbers
int numBlocks = NUM_ERROR_CORRECTION_BLOCKS[errorCorrectionLevel.getOrdinal()][version];
int blockEccLen = ECC_CODEWORDS_PER_BLOCK[errorCorrectionLevel.getOrdinal()][version];
int numBlocks = NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(errorCorrectionLevel)][version];
int blockEccLen = ECC_CODEWORDS_PER_BLOCK[static_cast<int>(errorCorrectionLevel)][version];
int rawCodewords = getNumRawDataModules(version) / 8;
int numShortBlocks = numBlocks - rawCodewords % numBlocks;
int shortBlockLen = rawCodewords / numBlocks;
@ -537,8 +527,8 @@ int QrCode::getNumDataCodewords(int ver, Ecc ecl) {
if (ver < MIN_VERSION || ver > MAX_VERSION)
throw "Version number out of range";
return getNumRawDataModules(ver) / 8
- ECC_CODEWORDS_PER_BLOCK[ecl.getOrdinal()][ver]
* NUM_ERROR_CORRECTION_BLOCKS[ecl.getOrdinal()][ver];
- ECC_CODEWORDS_PER_BLOCK[static_cast<int>(ecl)][ver]
* NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(ecl)][ver];
}

21
cpp/QrCode.hpp
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@ -44,25 +44,16 @@ class QrCode final {
/*
* Represents the error correction level used in a QR Code symbol.
*/
public: class Ecc final {
public: enum class Ecc {
// Constants declared in ascending order of error protection.
public: const static Ecc LOW, MEDIUM, QUARTILE, HIGH;
// Fields.
private: int ordinal;
private: int formatBits;
// Constructor.
private: Ecc(int ord, int fb);
// (Public) Returns a value in the range 0 to 3 (unsigned 2-bit integer).
public: int getOrdinal() const;
// (Package-private) Returns a value in the range 0 to 3 (unsigned 2-bit integer).
public: int getFormatBits() const;
LOW = 0, MEDIUM = 1, QUARTILE = 2, HIGH = 3
};
// Returns a value in the range 0 to 3 (unsigned 2-bit integer).
private: static int getFormatBits(Ecc ecl);
/*---- Public static factory functions ----*/

12
cpp/QrCodeGeneratorWorker.cpp
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@ -37,11 +37,11 @@ using qrcodegen::QrCode;
using qrcodegen::QrSegment;
static const QrCode::Ecc *(ECC_LEVELS[]) = {
&QrCode::Ecc::LOW,
&QrCode::Ecc::MEDIUM,
&QrCode::Ecc::QUARTILE,
&QrCode::Ecc::HIGH,
static const QrCode::Ecc ECC_LEVELS[] = {
QrCode::Ecc::LOW,
QrCode::Ecc::MEDIUM,
QrCode::Ecc::QUARTILE,
QrCode::Ecc::HIGH,
};
@ -83,7 +83,7 @@ int main() {
try { // Try to make QR Code symbol
const QrCode qr = QrCode::encodeSegments(segs,
*ECC_LEVELS[errCorLvl], minVersion, maxVersion, mask, boostEcl == 1);
ECC_LEVELS[errCorLvl], minVersion, maxVersion, mask, boostEcl == 1);
// Print grid of modules
std::cout << qr.getVersion() << std::endl;
for (int y = 0; y < qr.getSize(); y++) {