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cbor.cpp
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#include "cbor.h"
#include <cmath>
#include <QtEndian>
#include <QTime>
#include <QDate>
#include <QDateTime>
#include <QStringList>
namespace CBOR {
inline void qbswap_helper(const uchar *src, uchar *dest, int size) {
for(int i=0; i<size; ++i)
dest[i]=src[size - 1 - i];
}
template <typename T> inline void qbswap(const T src, uchar *dest) {
qbswap_helper(reinterpret_cast<const uchar *>(&src), dest, sizeof(T));
}
inline QByteArray nativeToBigEndian(quint16 v) {
QByteArray ret;
ret.resize(2);
qToBigEndian(v, reinterpret_cast<uchar *>(ret.data()));
return ret;
}
inline QByteArray nativeToBigEndian(quint32 v) {
QByteArray ret;
ret.resize(4);
qToBigEndian(v, reinterpret_cast<uchar *>(ret.data()));
return ret;
}
inline QByteArray nativeToBigEndian(quint64 v) {
QByteArray ret;
ret.resize(8);
qToBigEndian(v, reinterpret_cast<uchar *>(ret.data()));
return ret;
}
inline QByteArray nativeToBigEndian(double v) {
QByteArray ret;
ret.resize(8);
qbswap<double>(v, reinterpret_cast<uchar *>(ret.data()));
return ret;
}
inline char mkHeader(MajorType type, uchar info) {
return char(((type & 0x07) << 5) | (info & 0x1F));
}
inline QByteArray mkHeaderEx(MajorType type, quint64 v) {
QByteArray ret;
if (v < TypeValue::nextByte) {
ret += mkHeader(type, uchar(v & 0x1F));
} else {
if (v <= 0xFF) {
ret += mkHeader(type, TypeValue::nextByte);
ret += char(v);
} else if (v <= 0xFFFF) {
ret += mkHeader(type, TypeValue::next2Bytes);
ret += nativeToBigEndian(quint16(v));
} else if (v <= 0xFFFFFFFF) {
ret += mkHeader(type, TypeValue::next4Bytes);
ret += nativeToBigEndian(quint32(v));
} else {
ret += mkHeader(type, TypeValue::next8Bytes);
ret += nativeToBigEndian(quint64(v));
}
}
return ret;
}
quint64 parseHeader(QByteArray &data) {
auto sz = static_cast<TypeValue>(data.at(0) & 0x1F);
quint64 val = 0;
if (sz < TypeValue::nextByte) {
val = static_cast<uchar>(sz);
data = data.mid(1);
} else if (sz == TypeValue::nextByte) {
val = static_cast<uchar>(data.at(1));
data = data.mid(2);
} else if (sz == TypeValue::next2Bytes) {
val = qFromBigEndian<quint16>(reinterpret_cast<const uchar *>(data.data() + 1));
data = data.mid(3);
} else if (sz == TypeValue::next4Bytes) {
val = qFromBigEndian<quint32>(reinterpret_cast<const uchar *>(data.data() + 1));
data = data.mid(5);
} else if (sz == TypeValue::next8Bytes) {
val = qFromBigEndian<quint64>(reinterpret_cast<const uchar *>(data.data() + 1));
data = data.mid(9);
} else {
// TODO: Not implemented;
}
return val;
}
inline float parseFloat16(QByteArray data) {
float val = 0;
if (data.length() == 2)
{
int half = (((uint8_t)data[0]) << 8) + ((uint8_t)data[1]);
int exp = (half >> 10) & 0x1f;
int mant = half & 0x3ff;
if (exp == 0) {
val = ldexp(mant, -24);
} else if (exp != 31) {
val = ldexp(mant + 1024, exp - 25);
} else {
val = (mant == 0) ? INFINITY : NAN;
}
val = (half & 0x8000) ? -val : val;
}
return val;
}
inline QVariant _unpack(QByteArray &data) {
QVariant ret;
if (data.length()) {
auto header = static_cast<uchar>(data.at(0));
switch (header >> 5) {
case MajorType::positiveInt: {
auto v = parseHeader(data);
if (v <= 0xFFFFFFFF) {
ret = static_cast<quint32>(v);
} else {
ret = static_cast<quint64>(v);
}
} break;
case MajorType::negativeInt: {
auto v = parseHeader(data) + 1;
if (v <= 0xFFFFFFFF) {
ret = static_cast<quint32>(-v);
} else {
ret = static_cast<quint64>(-v);
}
} break;
case MajorType::bytes: {
auto sz = static_cast<int>(parseHeader(data));
ret = data.mid(0, sz);
data = data.mid(sz);
} break;
case MajorType::str: {
auto sz = static_cast<int>(parseHeader(data));
ret = QString::fromUtf8(data.mid(0, sz));
data = data.mid(sz);
} break;
case MajorType::array: {
auto sz = parseHeader(data);
QVariantList array;
for (quint64 i = 0; i < sz; ++i) {
array.append(_unpack(data));
}
ret = array;
} break;
case MajorType::map: {
auto sz = parseHeader(data);
QVariantMap map;
for (quint64 i = 0; i < sz; ++i) {
auto k = _unpack(data);
auto v = _unpack(data);
map[k.toString()] = v;
}
ret = map;
} break;
case MajorType::tagged:
// TODO: Tags
break;
case MajorType::other: {
auto st = header & 0x1F;
data = data.mid(1);
if (st == OtherType::false_) {
ret = false;
} else if (st == OtherType::true_) {
ret = true;
} else if (st == OtherType::null_) {
ret = QVariant();
} else if (st == OtherType::float16) {
ret = parseFloat16(data.left(2));
data = data.mid(2);
} else if (st == OtherType::float32) {
float out=0.;
qbswap(*(const float *)data.constData(), reinterpret_cast<uchar *>(&out));
ret = out;
data = data.mid(4);
} else if (st == OtherType::float64) {
double out=0.;
qbswap(*(const double *)data.constData(), reinterpret_cast<uchar *>(&out));
ret = out;
data = data.mid(8);
}
} break;
}
}
return ret;
}
}
QByteArray CBOR::pack(const QVariant &v) {
QByteArray ret;
switch (v.type()) {
case QVariant::Invalid: ret += mkHeader(MajorType::other, OtherType::null_); break;
case QVariant::Bool:
ret += mkHeader(MajorType::other, v.toBool() ? OtherType::true_ : OtherType::false_);
break;
case QVariant::Int:
case QVariant::LongLong: {
auto tp = MajorType::positiveInt;
auto val = v.toLongLong();
if (val < 0) {
tp = MajorType::negativeInt;
val = qAbs(val) - 1;
}
ret += mkHeaderEx(tp, static_cast<quint64>(val));
} break;
case QVariant::UInt:
case QVariant::ULongLong: {
ret += mkHeaderEx(MajorType::positiveInt, v.toULongLong());
} break;
case QVariant::Double: {
ret += mkHeader(MajorType::other, OtherType::float64);
ret.append(nativeToBigEndian(v.toDouble()));
} break;
case QVariant::ByteArray: {
auto b = v.toByteArray();
ret += mkHeaderEx(MajorType::bytes, static_cast<quint64>(b.length()));
ret += b;
} break;
case QVariant::String: {
auto s = v.toString().toUtf8();
ret += mkHeaderEx(MajorType::str, static_cast<quint64>(s.length()));
ret += s;
} break;
case QVariant::List: {
auto array = v.toList();
ret += mkHeaderEx(MajorType::array, static_cast<quint64>(array.length()));
for (auto &item : array) {
ret += pack(item);
}
} break;
case QVariant::StringList: {
auto array = v.toStringList();
ret += mkHeaderEx(MajorType::array, static_cast<quint64>(array.length()));
for (auto &item : array) {
ret += pack(item);
}
} break;
case QVariant::Map: {
auto map = v.toMap();
ret += mkHeaderEx(MajorType::map, static_cast<quint64>(map.size()));
for (QString key : map.keys()) {
ret += pack(key);
ret += pack(map[key]);
}
} break;
case QVariant::Time:
ret += pack(v.toTime().toString("HH:mm:ss"));
break;
case QVariant::Date:
ret += pack(v.toDate().toString("yyyy-MM-dd"));
break;
case QVariant::DateTime:
ret += pack(v.toDateTime().toString("yyyy-MM-ddTHH:mm:ss.zzz"));
break;
default:; // TODO: Unsupported
}
return ret;
}
QVariant CBOR::unpack(const QByteArray &v) {
auto data = v;
return _unpack(data);
}