OW_HTTPLenLimitIStream.cpp

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#include "OW_config.h"
#include "OW_HTTPLenLimitIStream.hpp"

namespace OW_NAMESPACE
{

using std::istream;
HTTPLengthLimitStreamBuffer::HTTPLengthLimitStreamBuffer(
      istream& istr, UInt64 length)
   : BaseStreamBuffer(2048, "in"), m_istr(istr),
     m_length(length), m_pos(0), m_isEnd(false)
// 2048 is a nice power of 2 that should be more than enough to hold most
// packets, since ethernet MTU is 1500
{
}
HTTPLengthLimitStreamBuffer::~HTTPLengthLimitStreamBuffer()
{
}
int
HTTPLengthLimitStreamBuffer::buffer_from_device(char* c, int n)
{
   if (m_isEnd || n < 0)
   {
      return -1;
   }
   unsigned int un = n; 
   // min of n and (length - pos)
   int tmpInLen = (un < (m_length - m_pos)) ? un : (m_length - m_pos);
   m_istr.read(c, tmpInLen);
   int lastRead = m_istr.gcount();
   m_pos += lastRead;
   if (m_pos == m_length)
   {
      m_isEnd = true;
   }
   return lastRead;
}
void
HTTPLengthLimitStreamBuffer::resetLen(UInt64 len)
{
   initGetBuffer();
   m_length = len;
   m_pos = 0;
   m_isEnd = false;
}
void
HTTPLenLimitIStream::resetLen(UInt64 len)
{
   clear();
   m_strbuf.resetLen(len);
}
HTTPLenLimitIStream::HTTPLenLimitIStream(istream& istr, UInt64 len)
   : HTTPLenLimitIStreamBase(istr, len)
   , CIMProtocolIStreamIFC(&m_strbuf)
   , m_istr(istr)
{
}

} // end namespace OW_NAMESPACE

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