/*
* File:        DataSource.h
*
* Copyright (c) Freescale Semiconductor, Inc. All rights reserved.
*
* Freescale Semiconductor, Inc.
* Proprietary & Confidential
*
* This source code and the algorithms implemented therein constitute
* confidential information and may comprise trade secrets of Freescale Semiconductor, Inc.
* or its associates, and any use thereof is subject to the terms and
* conditions of the Confidential Disclosure Agreement pursual to which this
* source code was originally received.
*/

#include "IVTDataSource.h"
#include "DataTarget.h"
#include "EndianUtilities.h"
#include <algorithm>
#include <stdlib.h>
#include <string.h>

using namespace elftosb;

IVTDataSource::IVTDataSource()
:   DataSource(),
   DataSource::Segment((DataSource&)*this),
   m_isSelfSet(false)
{
   // Init the IVT structure.
   memset(&m_ivt, 0, sizeof(m_ivt));
   hab_hdr_t hdr = IVT_HDR(sizeof(m_ivt), HAB_VERSION);
   m_ivt.hdr = hdr;
}

unsigned IVTDataSource::getData(unsigned offset, unsigned maxBytes, uint8_t * buffer)
{
   // Bail if the offset is out of range.
   if (offset >= sizeof(m_ivt))
   {
       return 0;
   }

   // If we have an associated target, and the IVT self pointer is not set, then
   // fill in the self pointer from the target address.
   if (m_target && !m_isSelfSet)
   {
       m_ivt.self = ENDIAN_HOST_TO_LITTLE_U32(m_target->getBeginAddress());
   }

   // Truncate max bytes at the end of the IVT.
   maxBytes = std::min<unsigned>(maxBytes, sizeof(m_ivt) - offset);

   // Copy into output buffer.
   if (maxBytes)
   {
       memcpy(buffer, (uint8_t *)&m_ivt + offset, maxBytes);
   }

   return maxBytes;
}

unsigned IVTDataSource::getLength()
{
   return sizeof(m_ivt);
}

//! The IVT has a natural location if its self pointer was explicitly specified.
//!
bool IVTDataSource::hasNaturalLocation()
{
   return m_isSelfSet;
}

//!
uint32_t IVTDataSource::getBaseAddress()
{
   return m_ivt.self;
}

bool IVTDataSource::setFieldByName(const std::string & name, uint32_t value)
{
   if (name == "entry")
   {
       m_ivt.entry = ENDIAN_HOST_TO_LITTLE_U32(value);
   }
   else if (name == "dcd")
   {
       m_ivt.dcd = ENDIAN_HOST_TO_LITTLE_U32(value);
   }
   else if (name == "boot_data")
   {
       m_ivt.boot_data = ENDIAN_HOST_TO_LITTLE_U32(value);
   }
   else if (name == "self")
   {
       m_ivt.self = ENDIAN_HOST_TO_LITTLE_U32(value);
       m_isSelfSet = true;
   }
   else if (name == "csf")
   {
       m_ivt.csf = ENDIAN_HOST_TO_LITTLE_U32(value);
   }
   else
   {
       // Unrecognized field name.
       return false;
   }

   return true;
}