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Strict aliasing.

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This commit is contained in:
John Greb
2014-11-22 21:55:35 +00:00
parent 25cffee789
commit 836796fff4
5 changed files with 75 additions and 58 deletions
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sdrbase/util/simpleserializer.cpp
+52 -30
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@@ -165,8 +165,14 @@ void SimpleSerializer::writeU64(quint32 id, quint64 value)
m_data.push_back((char)((value >> (i * 8)) & 0xff));
}
union floatasint {
quint32 u;
float f;
};
void SimpleSerializer::writeFloat(quint32 id, float value)
{
union floatasint tmp;
if(id == 0) {
qCritical("SimpleSerializer: ID 0 is not allowed");
return;
@@ -175,15 +181,21 @@ void SimpleSerializer::writeFloat(quint32 id, float value)
if(!writeTag(TFloat, id, 4))
return;
quint32 tmp = *((quint32*)&value);
m_data.push_back((char)((tmp >> 24) & 0xff));
m_data.push_back((char)((tmp >> 16) & 0xff));
m_data.push_back((char)((tmp >> 8) & 0xff));
m_data.push_back((char)(tmp & 0xff));
tmp.f = value;
m_data.push_back((char)((tmp.u >> 24) & 0xff));
m_data.push_back((char)((tmp.u >> 16) & 0xff));
m_data.push_back((char)((tmp.u >> 8) & 0xff));
m_data.push_back((char)(tmp.u & 0xff));
}
union doubleasint {
quint64 u;
double d;
};
void SimpleSerializer::writeDouble(quint32 id, double value)
{
union doubleasint tmp;
if(id == 0) {
qCritical("SimpleSerializer: ID 0 is not allowed");
return;
@@ -192,15 +204,15 @@ void SimpleSerializer::writeDouble(quint32 id, double value)
if(!writeTag(TDouble, id, 8))
return;
quint64 tmp = *((quint64*)&value);
m_data.push_back((char)((tmp >> 56) & 0xff));
m_data.push_back((char)((tmp >> 48) & 0xff));
m_data.push_back((char)((tmp >> 40) & 0xff));
m_data.push_back((char)((tmp >> 32) & 0xff));
m_data.push_back((char)((tmp >> 24) & 0xff));
m_data.push_back((char)((tmp >> 16) & 0xff));
m_data.push_back((char)((tmp >> 8) & 0xff));
m_data.push_back((char)(tmp & 0xff));
tmp.d = value;
m_data.push_back((char)((tmp.u >> 56) & 0xff));
m_data.push_back((char)((tmp.u >> 48) & 0xff));
m_data.push_back((char)((tmp.u >> 40) & 0xff));
m_data.push_back((char)((tmp.u >> 32) & 0xff));
m_data.push_back((char)((tmp.u >> 24) & 0xff));
m_data.push_back((char)((tmp.u >> 16) & 0xff));
m_data.push_back((char)((tmp.u >> 8) & 0xff));
m_data.push_back((char)(tmp.u & 0xff));
}
void SimpleSerializer::writeBool(quint32 id, bool value)
@@ -414,7 +426,7 @@ returnDefault:
bool SimpleDeserializer::readFloat(quint32 id, float* result, float def) const
{
uint readOfs;
quint32 tmp;
union floatasint tmp;
Elements::const_iterator it = m_elements.constFind(id);
if(it == m_elements.constEnd())
goto returnDefault;
@@ -424,10 +436,10 @@ bool SimpleDeserializer::readFloat(quint32 id, float* result, float def) const
goto returnDefault;
readOfs = it->ofs;
tmp = 0;
tmp.u = 0;
for(int i = 0; i < 4; i++)
tmp = (tmp << 8) | readByte(&readOfs);
*result = *((float*)&tmp);
tmp.u = (tmp.u << 8) | readByte(&readOfs);
*result = tmp.f;
return true;
returnDefault:
@@ -438,7 +450,7 @@ returnDefault:
bool SimpleDeserializer::readDouble(quint32 id, double* result, double def) const
{
uint readOfs;
quint64 tmp;
union doubleasint tmp;
Elements::const_iterator it = m_elements.constFind(id);
if(it == m_elements.constEnd())
goto returnDefault;
@@ -448,10 +460,10 @@ bool SimpleDeserializer::readDouble(quint32 id, double* result, double def) cons
goto returnDefault;
readOfs = it->ofs;
tmp = 0;
tmp.u = 0;
for(int i = 0; i < 8; i++)
tmp = (tmp << 8) | readByte(&readOfs);
*result = *((double*)&tmp);
tmp.u = (tmp.u << 8) | readByte(&readOfs);
*result = tmp.d;
return true;
returnDefault:
@@ -459,11 +471,21 @@ returnDefault:
return false;
}
union real4asint {
quint32 u;
Real r;
};
union real8asint {
quint64 u;
Real r;
};
bool SimpleDeserializer::readReal(quint32 id, Real* result, Real def) const
{
if(sizeof(Real) == 4) {
uint readOfs;
quint32 tmp;
union real4asint tmp;
Elements::const_iterator it = m_elements.constFind(id);
if(it == m_elements.constEnd())
goto returnDefault32;
@@ -473,10 +495,10 @@ bool SimpleDeserializer::readReal(quint32 id, Real* result, Real def) const
goto returnDefault32;
readOfs = it->ofs;
tmp = 0;
tmp.u = 0;
for(int i = 0; i < 4; i++)
tmp = (tmp << 8) | readByte(&readOfs);
*result = *((Real*)&tmp);
tmp.u = (tmp.u << 8) | readByte(&readOfs);
*result = tmp.r;
return true;
returnDefault32:
@@ -484,7 +506,7 @@ bool SimpleDeserializer::readReal(quint32 id, Real* result, Real def) const
return false;
} else {
uint readOfs;
quint64 tmp;
union real8asint tmp;
Elements::const_iterator it = m_elements.constFind(id);
if(it == m_elements.constEnd())
goto returnDefault64;
@@ -494,10 +516,10 @@ bool SimpleDeserializer::readReal(quint32 id, Real* result, Real def) const
goto returnDefault64;
readOfs = it->ofs;
tmp = 0;
tmp.u = 0;
for(int i = 0; i < 8; i++)
tmp = (tmp << 8) | readByte(&readOfs);
*result = *((Real*)&tmp);
tmp.u = (tmp.u << 8) | readByte(&readOfs);
*result = tmp.r;
return true;
returnDefault64: