Convert a serialized integer into a 32-bit signed integer.

Declared in file: hzCodec.h
Defined in file : hzCodec.cpp

Function Logic:

Function body:

hzEcode ReadSerialSINT32 (int32_t& nValue)uint32_t& nLen, unsigned char* ptr, 
{
   //  Category: Number Serialization
   //  
   //  Convert a serialized integer into a 32-bit signed integer.
   //  
   //  Arguments: 1) nValue Indicated length or value
   //     2) nLen The size of the indicator itself
   //     3) ptr  Pointer into a uchar buffer (start of indicator)
   //  
   //  Returns: E_ARGUMENT If no ptr is supplied
   //     E_OK  Operation successful
   uint32_t    val ;   //  Value
   bool        bNeg ;  //  Negative
   if (!ptr)
       { nValue = 0; nLen = 0; return E_ARGUMENT ; }
   if (!(*ptr & 0x80))
   {
       bNeg = *ptr & 0x40;
       val = *ptr & 0x3f;
   }
   else
   {
       //  Top bit set so indicator length will be ...
       bNeg = *ptr & 0x10;
       nLen = (*ptr & 0x60)>>5;
       nLen += 2;
       switch  (nLen)
       {
       case 2:     val = ((ptr[0]& 0x0f)<<8);
                   val += ptr[1];
                   break ;
       case 3:     val = ((ptr[0]& 0x0f)<<16);
                   val += ((ptr[1]<< 8)+ ptr[2]);
                   break ;
       case 4:     val = ((ptr[0]& 0x0f)<<24);
                   val += ((ptr[1]<< 16)+(ptr[2]<< 8)+ ptr[3]);
                   break ;
       case 5:     _endian_import4(val, ptr) ;
                   break ;
       }
   }
   nValue = bNeg ? -val : val ;
   return E_OK ;
}