/*=========================================================================

  Program: GDCM (Grassroots DICOM). A DICOM library

  Copyright (c) 2006-2011 Mathieu Malaterre
  All rights reserved.
  See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "gdcmUUIDGenerator.h"
#include "gdcmTrace.h"
#include "gdcmSystem.h"

#include <cstring> // memcpy

// FIXME...
#if defined(_WIN32) || defined(__CYGWIN__)
#define HAVE_UUIDCREATE
#else
#define HAVE_UUID_GENERATE
#endif

#ifdef HAVE_UUID_GENERATE
#include "gdcm_uuid.h"
#endif

#ifdef GDCM_HAVE_RPC_H
#include <rpc.h>
#endif

namespace gdcm
{

const char* UUIDGenerator::Generate()
{
  Unique.resize( 36 );
  char *uuid_data = &Unique[0];
#if defined(HAVE_UUID_GENERATE)
  assert( sizeof(uuid_t) == 16 );
  uuid_t g;
  uuid_generate(g);
  uuid_unparse(g, uuid_data);
#elif defined(HAVE_UUID_CREATE)
  uint32_t rv;
  uuid_t g;
  uuid_create(&g, &rv);
  if (rv != uuid_s_ok) return NULL;
  uuid_to_string(&g, &uuid_data, &rv);
  if (rv != uuid_s_ok) return NULL;
#elif defined(HAVE_UUIDCREATE)
  UUID uuid;
  UuidCreate(&uuid);
  unsigned char * str = 0;
  UuidToString(&uuid, &str);
  Unique = (char*)str;
  RpcStringFree(&str);
#else
#error should not happen
#endif
  assert( IsValid( Unique.c_str() ) );

  return Unique.c_str();
}

bool UUIDGenerator::IsValid(const char *suid)
{
  if( !suid ) return false;
#if defined(HAVE_UUID_GENERATE)
  uuid_t uu;
  // technically the specification wants char* input not const char*:
  // this makes compilation fails otherwise on OpenIndiana:
  int res = uuid_parse((const char*)suid, uu);
  if( res ) return false;
#elif defined(HAVE_UUID_CREATE)
  // http://www.freebsd.org/cgi/man.cgi?query=uuid_create
  uint32_t status;
  uuid_t uuid;
  uuid_from_string(suid, &uuid, &status);
  if( status != uuid_s_ok	) return false;
#elif defined(HAVE_UUIDCREATE)
  // http://msdn.microsoft.com/en-us/library/windows/desktop/aa379336(v=vs.85).aspx
  UUID uuid;
  if (FAILED(UuidFromString((unsigned char*)suid, &uuid)))
    {
    return false;
    }
#else
#error should not happen
#endif
  // no error found !
  return true;
}


} // end namespace gdcm