degenerate let forms

[bpt/guile.git] / libguile / uniform.c

/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003,2004, 2005, 2006, 2009, 2010, 2013, 2014 Free Software Foundation, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */


\f

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include "libguile/_scm.h"
#include "libguile/__scm.h"

#include "libguile/uniform.h"


const size_t scm_i_array_element_type_sizes[SCM_ARRAY_ELEMENT_TYPE_LAST + 1] = {
  0,
  0,
  1,
  8,
  8, 8,
  16, 16,
  32, 32,
  64, 64,
  32, 64,
  64, 128
};

size_t
scm_array_handle_uniform_element_size (scm_t_array_handle *h)
{
  size_t ret = scm_i_array_element_type_sizes[h->element_type];
  if (ret && ret % 8 == 0)
    return ret / 8;
  else if (ret)
    scm_wrong_type_arg_msg (NULL, 0, h->array, "byte-aligned uniform array");
  else
    scm_wrong_type_arg_msg (NULL, 0, h->array, "uniform array");
}

size_t
scm_array_handle_uniform_element_bit_size (scm_t_array_handle *h)
{
  size_t ret = scm_i_array_element_type_sizes[h->element_type];
  if (ret)
    return ret;
  else
    scm_wrong_type_arg_msg (NULL, 0, h->array, "uniform array");
}

const void *
scm_array_handle_uniform_elements (scm_t_array_handle *h)
{
  return scm_array_handle_uniform_writable_elements (h);
}

void *
scm_array_handle_uniform_writable_elements (scm_t_array_handle *h)
{
  size_t esize;
  scm_t_uint8 *ret;

  esize = scm_array_handle_uniform_element_size (h);
  ret = ((scm_t_uint8*) h->writable_elements) + h->base * esize;
  return ret;
}

void
scm_init_uniform (void)
{
#include "libguile/uniform.x"
}

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/