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/* Generic helper function for repacking arrays.

   Copyright 2003, 2004, 2005, 2007, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Paul Brook <paul@nowt.org>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public

License as published by the Free Software Foundation; either

version 3 of the License, or (at your option) any later version.

Libgfortran is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <stdlib.h>

#include <assert.h>

#include <string.h>

extern void internal_unpack (gfc_array_char *, const void *);

export_proto(internal_unpack);

void

internal_unpack (gfc_array_char * d, const void * s)

{

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type stride[GFC_MAX_DIMENSIONS];

  index_type stride0;

  index_type dim;

  index_type dsize;

  char *dest;

  const char *src;

  int n;

  int size;

  int type_size;

  dest = d->data;

  /* This check may be redundant, but do it anyway.  */

  if (s == dest || !s)

    return;

  type_size = GFC_DTYPE_TYPE_SIZE (d);

  switch (type_size)

    {

    case GFC_DTYPE_INTEGER_1:

    case GFC_DTYPE_LOGICAL_1:

    case GFC_DTYPE_DERIVED_1:

      internal_unpack_1 ((gfc_array_i1 *) d, (const GFC_INTEGER_1 *) s);

      return;

    case GFC_DTYPE_INTEGER_2:

    case GFC_DTYPE_LOGICAL_2:

      internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);

      return;

    case GFC_DTYPE_INTEGER_4:

    case GFC_DTYPE_LOGICAL_4:

      internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);

      return;

    case GFC_DTYPE_INTEGER_8:

    case GFC_DTYPE_LOGICAL_8:

      internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);

      return;

#if defined (HAVE_GFC_INTEGER_16)

    case GFC_DTYPE_INTEGER_16:

    case GFC_DTYPE_LOGICAL_16:

      internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);

      return;

#endif

    case GFC_DTYPE_REAL_4:

      internal_unpack_r4 ((gfc_array_r4 *) d, (const GFC_REAL_4 *) s);

      return;

    case GFC_DTYPE_REAL_8:

      internal_unpack_r8 ((gfc_array_r8 *) d, (const GFC_REAL_8 *) s);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# if defined(HAVE_GFC_REAL_10)

    case GFC_DTYPE_REAL_10:

      internal_unpack_r10 ((gfc_array_r10 *) d, (const GFC_REAL_10 *) s);

      return;

# endif

# if defined(HAVE_GFC_REAL_16)

    case GFC_DTYPE_REAL_16:

      internal_unpack_r16 ((gfc_array_r16 *) d, (const GFC_REAL_16 *) s);

      return;

# endif

#endif

    case GFC_DTYPE_COMPLEX_4:

      internal_unpack_c4 ((gfc_array_c4 *)d, (const GFC_COMPLEX_4 *)s);

      return;

    case GFC_DTYPE_COMPLEX_8:

      internal_unpack_c8 ((gfc_array_c8 *)d, (const GFC_COMPLEX_8 *)s);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# if defined(HAVE_GFC_COMPLEX_10)

    case GFC_DTYPE_COMPLEX_10:

      internal_unpack_c10 ((gfc_array_c10 *) d, (const GFC_COMPLEX_10 *) s);

      return;

# endif

# if defined(HAVE_GFC_COMPLEX_16)

    case GFC_DTYPE_COMPLEX_16:

      internal_unpack_c16 ((gfc_array_c16 *) d, (const GFC_COMPLEX_16 *) s);

      return;

# endif

#endif

    case GFC_DTYPE_DERIVED_2:

      if (GFC_UNALIGNED_2(d->data) || GFC_UNALIGNED_2(s))

        break;

      else

        {

          internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);

          return;

        }

    case GFC_DTYPE_DERIVED_4:

      if (GFC_UNALIGNED_4(d->data) || GFC_UNALIGNED_4(s))

        break;

      else

        {

          internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);

          return;

        }

    case GFC_DTYPE_DERIVED_8:

      if (GFC_UNALIGNED_8(d->data) || GFC_UNALIGNED_8(s))

        break;

      else

        {

          internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);

          return;

        }

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_DERIVED_16:

      if (GFC_UNALIGNED_16(d->data) || GFC_UNALIGNED_16(s))

        break;

      else

        {

          internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);

          return;

        }

#endif

    default:

      break;

    }

  size = GFC_DESCRIPTOR_SIZE (d);

  dim = GFC_DESCRIPTOR_RANK (d);

  dsize = 1;

  for (n = 0; n < dim; n++)

    {

      count[n] = 0;

      stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);

      extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);

      if (extent[n] <= 0)

        return;

      if (dsize == stride[n])

        dsize *= extent[n];

      else

        dsize = 0;

    }

  src = s;

  if (dsize != 0)

    {

      memcpy (dest, src, dsize * size);

      return;

    }

  stride0 = stride[0] * size;

  while (dest)

    {

      /* Copy the data.  */

      memcpy (dest, src, size);

      /* Advance to the next element.  */

      src += size;

      dest += stride0;

      count[0]++;

      /* Advance to the next source element.  */

      n = 0;

      while (count[n] == extent[n])

        {

          /* When we get to the end of a dimension, reset it and increment

             the next dimension.  */

          count[n] = 0;

          /* We could precalculate these products, but this is a less

             frequently used path so probably not worth it.  */

          dest -= stride[n] * extent[n] * size;

          n++;

          if (n == dim)

            {

              dest = NULL;

              break;

            }

          else

            {

              count[n]++;

              dest += stride[n] * size;

            }

        }

    }

}