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#include <string.h>
#include "message.h"
Message::Message(unsigned long length, const char * data)
{
memorySize=length;
memory = boost::shared_array<char>(new char[memorySize]);
if (data)
{
startIndex=0;
endIndex=memorySize;
memcpy(memory.get(),data,memorySize);
}
else
{
startIndex=memorySize;
endIndex=memorySize;
}
dontSendFlag=false;
}
Message::Message(const Message& message)
{
memorySize=message.size();
memory = boost::shared_array<char>(new char[memorySize]);
startIndex=0;
endIndex=memorySize;
memcpy(memory.get(),message.getDataPtr(),memorySize);
dontSendFlag=message.dontSendFlag;
}
Message::~Message()
{
}
void Message::setMessage(unsigned long length, const char * data)
{
memorySize=length;
memory = boost::shared_array<char>(new char[memorySize]);
startIndex=0;
endIndex=length;
memcpy(memory.get(),data,length);
}
Message& Message::operator=(const Message & message)
{
// check for self-assignment by comparing the address of the implicit object and the parameter
if (this == &message)
{
return *this;
}
setMessage(message.size(),message.getDataPtr());
dontSendFlag=message.dontSendFlag;
return *this;
}
const char * Message::getDataPtr() const
{
return &memory[startIndex];
}
unsigned long Message::size() const
{
return endIndex-startIndex;
}
void Message::clear()
{
memorySize=STANDARDBUFFERSIZE;
memory = boost::shared_array<char>(new char[memorySize]);
startIndex=memorySize;
endIndex=memorySize;
dontSendFlag=false;
}
const char & Message::operator [] (unsigned long idx)
{
unsigned long localidx=startIndex+idx;
if (localidx>=memorySize)
{
throw MessageException("Message::operator[] failed, localidx>=memorySize");
}
return memory[localidx];
}
void Message::pushFrontMemory(const void *src, size_t n)
{
// increase memory by STANDARDBUFFERINCREMENT or n
if (startIndex<n)
{
long increment=STANDARDBUFFERINCREMENT;
if (startIndex+STANDARDBUFFERINCREMENT<n)
{
increment=n;
}
long newMemorySize=memorySize+increment;
boost::shared_array<char> newMemory(new char[newMemorySize]);
long newStartIndex=startIndex+increment;
long newEndIndex=endIndex+increment;
memcpy(&newMemory[newStartIndex], &memory[startIndex], endIndex-startIndex);
memorySize=newMemorySize;
memory=newMemory;
startIndex=newStartIndex;
endIndex=newEndIndex;
}
startIndex-=n;
// without litte=>big endian conversion
// memcpy(&memory[startIndex],src,n);
// with little =>big endian conversion
char * srcchar=(char*)src;
for (unsigned long k=0; k<n; k++)
{
memory[startIndex+(n-1)-k]=srcchar[k];
}
}
void Message::pushBackMemory(const void *src, size_t n)
{
// increase memory by STANDARDBUFFERINCREMENT or n
if (endIndex+n>memorySize)
{
long increment=STANDARDBUFFERINCREMENT;
if (endIndex+n>memorySize+STANDARDBUFFERINCREMENT)
{
increment=n;
}
unsigned long newMemorySize=memorySize+increment;
boost::shared_array<char> newMemory(new char[newMemorySize]);
unsigned long newStartIndex=startIndex;
unsigned long newEndIndex=endIndex;
memcpy(&newMemory[newStartIndex], &memory[startIndex], endIndex-startIndex);
memorySize=newMemorySize;
memory=newMemory;
startIndex=newStartIndex;
endIndex=newEndIndex;
}
// without litte=>big endian conversion
// memcpy(&newMemory[endIndex],src,n);
// with little =>big endian conversion
char * srccrar=(char*)src;
for (unsigned long k=0; k<n; k++)
{
memory[endIndex+(n-1)-k]=srccrar[k];
}
endIndex+=n;
}
void Message::popFrontMemory(void *dest, size_t n)
{
if ( n<=endIndex-startIndex )
{
// without big=>litte endian conversion
// memcpy(dest,&memory[startIndex],n);
// with little =>big endian conversion
char * destchar=(char*)dest;
for (unsigned long k=0; k<n; k++)
{
destchar[k]=memory[startIndex+(n-1)-k];
}
startIndex+=n;
// shrink memory
if (startIndex>=STANDARDBUFFERINCREMENT)
{
unsigned long newMemorySize=memorySize-STANDARDBUFFERINCREMENT;
boost::shared_array<char> newMemory(new char[newMemorySize]);
unsigned long newStartIndex=startIndex-STANDARDBUFFERINCREMENT;
unsigned long newEndIndex=endIndex-STANDARDBUFFERINCREMENT;
memcpy(&newMemory[newStartIndex], &memory[startIndex], endIndex-startIndex);
memorySize=newMemorySize;
memory=newMemory;
startIndex=newStartIndex;
endIndex=newEndIndex;
}
}
else
{
throw MessageException("Message::popFrontMemory failed, no data available");
}
}
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