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// copyright (c) 2007 magnus auvinen, see licence.txt for more info
#include <base/system.h>
#include "packer.h"
#include "compression.h"
#include "engine.h"
#include "config.h"
void CPacker::Reset()
{
m_Error = 0;
m_pCurrent = m_aBuffer;
m_pEnd = m_pCurrent + PACKER_BUFFER_SIZE;
}
void CPacker::AddInt(int i)
{
if(m_Error)
return;
// make sure that we have space enough
if(m_pEnd - m_pCurrent < 6)
{
dbg_break();
m_Error = 1;
}
else
m_pCurrent = CVariableInt::Pack(m_pCurrent, i);
}
void CPacker::AddString(const char *pStr, int Limit)
{
if(m_Error)
return;
//
if(Limit > 0)
{
while(*pStr && Limit != 0)
{
*m_pCurrent++ = *pStr++;
Limit--;
if(m_pCurrent >= m_pEnd)
{
m_Error = 1;
break;
}
}
*m_pCurrent++ = 0;
}
else
{
while(*pStr)
{
*m_pCurrent++ = *pStr++;
if(m_pCurrent >= m_pEnd)
{
m_Error = 1;
break;
}
}
*m_pCurrent++ = 0;
}
}
void CPacker::AddRaw(const void *pData, int Size)
{
if(m_Error)
return;
if(m_pCurrent+Size >= m_pEnd)
{
m_Error = 1;
return;
}
const unsigned char *pSrc = (const unsigned char *)pData;
while(Size)
{
*m_pCurrent++ = *pSrc++;
Size--;
}
}
void CUnpacker::Reset(const void *pData, int Size)
{
m_Error = 0;
m_pStart = (const unsigned char *)pData;
m_pEnd = m_pStart + Size;
m_pCurrent = m_pStart;
}
int CUnpacker::GetInt()
{
if(m_Error)
return 0;
if(m_pCurrent >= m_pEnd)
{
m_Error = 1;
return 0;
}
int i;
m_pCurrent = CVariableInt::Unpack(m_pCurrent, &i);
if(m_pCurrent > m_pEnd)
{
m_Error = 1;
return 0;
}
return i;
}
const char *CUnpacker::GetString()
{
if(m_Error || m_pCurrent >= m_pEnd)
return "";
char *pPtr = (char *)m_pCurrent;
while(*m_pCurrent) // skip the string
{
m_pCurrent++;
if(m_pCurrent == m_pEnd)
{
m_Error = 1;;
return "";
}
}
m_pCurrent++;
// sanitize all strings
str_sanitize(pPtr);
return pPtr;
}
const unsigned char *CUnpacker::GetRaw(int Size)
{
const unsigned char *pPtr = m_pCurrent;
if(m_Error)
return 0;
// check for nasty sizes
if(Size < 0 || m_pCurrent+Size > m_pEnd)
{
m_Error = 1;
return 0;
}
// "unpack" the data
m_pCurrent += Size;
return pPtr;
}
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