OW_HTTPDeflateIStream.cpp

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#include "OW_config.h"
#ifdef OW_HAVE_ZLIB_H
#include "OW_HTTPDeflateIStream.hpp"
#include "OW_HTTPException.hpp"

namespace OW_NAMESPACE
{

using std::istream;
HTTPDeflateIStreamBuffer::HTTPDeflateIStreamBuffer(istream& istr)
   : BaseStreamBuffer(HTTP_BUF_SIZE, "in")
   , m_istr(istr)
{
   m_zstr.opaque = Z_NULL;
   m_zstr.zfree = Z_NULL;
   m_zstr.zalloc = Z_NULL;
   m_zstr.avail_in = 0;
   int rval = inflateInit(&m_zstr);
   if (rval != Z_OK)
   {
      String msg = "Error: inflateInit returned " + String(rval);
      if (m_zstr.msg)
      {
         msg += String(": ") + String(m_zstr.msg);
      }
      OW_THROW(HTTPException, msg.c_str());
   }
}
HTTPDeflateIStreamBuffer::~HTTPDeflateIStreamBuffer()
{
   inflateEnd(&m_zstr);
}
int
HTTPDeflateIStreamBuffer::buffer_from_device(char* c, int n)
{
   if (n < 1)
   {
      return 0;
   }
   m_zstr.avail_out = n;
   m_zstr.next_out = reinterpret_cast<Bytef*>(c);
   int bytesRead = 0;
   while (m_zstr.avail_out > 0)
   {
      if (m_zstr.avail_in == 0)
      {
         if (m_istr)
         {
            m_istr.read(reinterpret_cast<char*>(m_inBuf), m_inBufSize);
            m_zstr.avail_in = m_istr.gcount();
            m_zstr.next_in = m_inBuf;
         }
      }
      int rv = inflate(&m_zstr, Z_SYNC_FLUSH);
      bytesRead = n - m_zstr.avail_out;
      if (rv != Z_OK)
      {
         break;
      }
   }
   if (bytesRead > 0)
   {
      return bytesRead;
   }
   else
   {
      return -1;
   }
   /*
   if (!m_istr)
   {
      return -1;
   }
   m_istr.read(m_inBuf, n);
   int bytesRead = m_istr.gcount();
   m_zstr.next_in = m_inBuf;
   m_zstr.avail_in = bytesRead;
   m_zstr.next_out = (Bytef*)c;  
   m_zstr.avail_out = n;
   int rv = inflate(&m_zstr, Z_SYNC_FLUSH);
   if (rv != Z_OK
       && rv != Z_STREAM_END)
   {
      return -1;
   }
   return (n - m_zstr.avail_out);
   */
}
HTTPDeflateIStream::HTTPDeflateIStream(
         const CIMProtocolIStreamIFCRef& istr)
   : HTTPDeflateIStreamBase(*istr)
   , CIMProtocolIStreamIFC(&m_strbuf)
   , m_istr(istr)
{
}

// TODO: Move all this knowledge about CIM and specific trailers into HTTPClient
void HTTPDeflateIStream::checkForError() const
{
   m_istr->checkForError();
}

CIMProtocolIStreamIFCRef
HTTPDeflateIStream::getInputStreamOrig()
{
   return m_istr;
}

} // end namespace OW_NAMESPACE

#endif // #ifdef OW_HAVE_ZLIB_H

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