path: root/src/ramps.c

/**
 * gammad -- Cooperative gamma server
 * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
 * 
 * This library 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.
 * 
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "ramps.h"

#include <errno.h>
#include <stdlib.h>
#include <string.h>



/**
 * The name of the process
 */
extern char* argv0;



/**
 * Marshal a ramp trio
 * 
 * @param   this        The ramps
 * @param   buf         Output buffer for the marshalled ramps,
 *                      `NULL` just measure how large the buffers
 *                      needs to be
 * @param   ramps_size  The byte-size of ramps
 * @return              The number of marshalled byte
 */
size_t gamma_ramps_marshal(const union gamma_ramps* this, char* buf, size_t ramps_size)
{
  if (buf != NULL)
    memcpy(buf, this->u8.red, ramps_size);
  return ramps_size;
}


/**
 * Unmarshal a ramp trio
 * 
 * @param   this        Output for the ramps, `.red_size`, `.green_size`,
 *                      and `.blue_size` must already be set
 * @param   buf         Buffer with the marshalled ramps
 * @param   ramps_size  The byte-size of ramps
 * @return              The number of unmarshalled bytes, 0 on error
 */
size_t gamma_ramps_unmarshal(union gamma_ramps* this, const char* buf, size_t ramps_size)
{
  size_t depth = ramps_size / (this->u8.red_size + this->u8.green_size + this->u8.blue_size);
  int r = 0;
  switch (depth)
    {
    case 1:
      r = libgamma_gamma_ramps8_initialise(&(this->u8));
      break;
    case 2:
      r = libgamma_gamma_ramps16_initialise(&(this->u16));
      break;
    case 4:
      r = libgamma_gamma_ramps32_initialise(&(this->u32));
      break;
    case 8:
      r = libgamma_gamma_ramps64_initialise(&(this->u64));
      break;
    default:
      if (depth == sizeof(float))
	r = libgamma_gamma_rampsf_initialise(&(this->f));
      else if (depth == sizeof(double))
	r = libgamma_gamma_rampsd_initialise(&(this->d));
      else
	abort();
      break;
    }
  if (r)
    {
      libgamma_perror(argv0, r);
      errno = 0;
      return 0;
    }
  memcpy(this->u8.red, buf, ramps_size);
  return ramps_size;
}