gimp/app/core/gimppalette-load.c

/* GIMP - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program 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 program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <glib/gstdio.h>

#ifdef G_OS_WIN32
#include "libgimpbase/gimpwin32-io.h"
#endif

#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"

#include "core-types.h"

#include "gimppalette.h"
#include "gimppalette-load.h"

#include "gimp-intl.h"


GList *
gimp_palette_load (GimpContext  *context,
                   GFile        *file,
                   GError      **error)
{
  GList        *list;
  GInputStream *input;
  GError       *my_error = NULL;

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  input = G_INPUT_STREAM (g_file_read (file, NULL, &my_error));
  if (! input)
    {
      g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_OPEN,
                   _("Could not open '%s' for reading: %s"),
                   gimp_file_get_utf8_name (file), my_error->message);
      g_clear_error (&my_error);
      return NULL;
    }

  list = gimp_palette_load_gpl (context, file, input, error);

  g_object_unref (input);

  return list;
}

GList *
gimp_palette_load_gpl (GimpContext   *context,
                       GFile         *file,
                       GInputStream  *input,
                       GError       **error)
{
  GimpPalette      *palette = NULL;
  GimpPaletteEntry *entry;
  GDataInputStream *data_input;
  gchar            *str;
  gsize             str_len;
  gchar            *tok;
  gint              r, g, b;
  gint              linenum;
  GError           *my_error = NULL;

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  data_input = g_data_input_stream_new (input);

  r = g = b = 0;

  linenum = 1;
  str_len = 1024;
  str = g_data_input_stream_read_line (data_input, &str_len,
                                       NULL, &my_error);
  if (! str)
    goto failed;

  if (! g_str_has_prefix (str, "GIMP Palette"))
    {
      g_set_error (&my_error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
                   _("Missing magic header."));
      g_free (str);
      goto failed;
    }

  palette = g_object_new (GIMP_TYPE_PALETTE,
                          "mime-type", "application/x-gimp-palette",
                          NULL);

  linenum++;
  str_len = 1024;
  str = g_data_input_stream_read_line (data_input, &str_len,
                                       NULL, &my_error);
  if (! str)
    goto failed;

  if (g_str_has_prefix (str, "Name: "))
    {
      gchar *utf8;

      utf8 = gimp_any_to_utf8 (g_strstrip (str + strlen ("Name: ")), -1,
                               _("Invalid UTF-8 string in palette file '%s'"),
                               gimp_file_get_utf8_name (file));
      gimp_object_take_name (GIMP_OBJECT (palette), utf8);
      g_free (str);

      linenum++;
      str_len = 1024;
      str = g_data_input_stream_read_line (data_input, &str_len,
                                           NULL, &my_error);
      if (! str)
        goto failed;

      if (g_str_has_prefix (str, "Columns: "))
        {
          gint columns;

          columns = atoi (g_strstrip (str + strlen ("Columns: ")));

          if (columns < 0 || columns > 256)
            {
              g_message (_("Reading palette file '%s': "
                           "Invalid number of columns in line %d. "
                           "Using default value."),
                         gimp_file_get_utf8_name (file), linenum);
              columns = 0;
            }

          gimp_palette_set_columns (palette, columns);
          g_free (str);

          linenum++;
          str_len = 1024;
          str = g_data_input_stream_read_line (data_input, &str_len,
                                               NULL, &my_error);
          if (! str)
            goto failed;
        }
    }
  else /* old palette format */
    {
      gimp_object_take_name (GIMP_OBJECT (palette),
                             g_path_get_basename (gimp_file_get_utf8_name (file)));
    }

  while (str)
    {
      if (str[0] != '#' && str[0] != '\n')
        {
          tok = strtok (str, " \t");
          if (tok)
            r = atoi (tok);
          else
            g_message (_("Reading palette file '%s': "
                         "Missing RED component in line %d."),
                       gimp_file_get_utf8_name (file), linenum);

          tok = strtok (NULL, " \t");
          if (tok)
            g = atoi (tok);
          else
            g_message (_("Reading palette file '%s': "
                         "Missing GREEN component in line %d."),
                       gimp_file_get_utf8_name (file), linenum);

          tok = strtok (NULL, " \t");
          if (tok)
            b = atoi (tok);
          else
            g_message (_("Reading palette file '%s': "
                         "Missing BLUE component in line %d."),
                       gimp_file_get_utf8_name (file), linenum);

          /* optional name */
          tok = strtok (NULL, "\n");

          if (r < 0 || r > 255 ||
              g < 0 || g > 255 ||
              b < 0 || b > 255)
            g_message (_("Reading palette file '%s': "
                         "RGB value out of range in line %d."),
                       gimp_file_get_utf8_name (file), linenum);

          /* don't call gimp_palette_add_entry here, it's rather inefficient */
          entry = g_slice_new0 (GimpPaletteEntry);

          gimp_rgba_set_uchar (&entry->color,
                               (guchar) r,
                               (guchar) g,
                               (guchar) b,
                               255);

          entry->name     = g_strdup (tok ? tok : _("Untitled"));
          entry->position = gimp_palette_get_n_colors (palette);

          palette->colors = g_list_prepend (palette->colors, entry);
          palette->n_colors++;
        }

      g_free (str);

      linenum++;
      str_len = 1024;
      str = g_data_input_stream_read_line (data_input, &str_len,
                                           NULL, &my_error);
      if (! str)
        {
          if (! palette->colors)
            goto failed;

          if (my_error)
            {
              g_message (_("Reading palette file '%s': "
                           "Read %d colors from truncated file: %s"),
                         gimp_file_get_utf8_name (file),
                         g_list_length (palette->colors),
                         my_error->message);
              g_clear_error (&my_error);
              break;
            }
        }
    }

  palette->colors = g_list_reverse (palette->colors);

  g_object_unref (data_input);

  return g_list_prepend (NULL, palette);

 failed:

  g_object_unref (data_input);

  if (palette)
    g_object_unref (palette);

  if (error && *error == NULL)
    {
      gchar *msg;

      if (my_error)
        msg = g_strdup_printf (_("Line %d: %s"), linenum, my_error->message);
      else
        msg = g_strdup_printf (_("File is truncated in line %d"), linenum);

      g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
                   _("Error while reading palette file '%s': %s"),
                   gimp_file_get_utf8_name (file), msg);

      g_free (msg);
    }

  g_clear_error (&my_error);

  return NULL;
}

GList *
gimp_palette_load_act (GimpContext  *context,
                       GFile        *file,
                       FILE         *f,
                       GError      **error)
{
  GimpPalette *palette;
  gchar       *palette_name;
  gint         fd = fileno (f);
  guchar       color_bytes[4];

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  palette_name = g_path_get_basename (gimp_file_get_utf8_name (file));
  palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
  g_free (palette_name);

  while (read (fd, color_bytes, 3) == 3)
    {
      GimpRGB color;

      gimp_rgba_set_uchar (&color,
                           color_bytes[0],
                           color_bytes[1],
                           color_bytes[2],
                           255);
      gimp_palette_add_entry (palette, -1, NULL, &color);
    }

  return g_list_prepend (NULL, palette);
}

GList *
gimp_palette_load_riff (GimpContext  *context,
                        GFile        *file,
                        FILE         *f,
                        GError      **error)
{
  GimpPalette *palette;
  gchar       *palette_name;
  gint         fd = fileno (f);
  guchar       color_bytes[4];

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  palette_name = g_path_get_basename (gimp_file_get_utf8_name (file));
  palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
  g_free (palette_name);

  lseek (fd, 28, SEEK_SET);

  while (read (fd,
               color_bytes, sizeof (color_bytes)) == sizeof (color_bytes))
    {
      GimpRGB color;

      gimp_rgba_set_uchar (&color,
                           color_bytes[0],
                           color_bytes[1],
                           color_bytes[2],
                           255);
      gimp_palette_add_entry (palette, -1, NULL, &color);
    }

  return g_list_prepend (NULL, palette);
}

GList *
gimp_palette_load_psp (GimpContext  *context,
                       GFile        *file,
                       FILE         *f,
                       GError      **error)
{
  GimpPalette *palette;
  gchar       *palette_name;
  gint         fd = fileno (f);
  guchar       color_bytes[4];
  gint         number_of_colors;
  gint         data_size;
  gint         i, j;
  gboolean     color_ok;
  gchar        buffer[4096];
  /*Maximum valid file size: 256 * 4 * 3 + 256 * 2  ~= 3650 bytes */
  gchar      **lines;
  gchar      **ascii_colors;

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  palette_name = g_path_get_basename (gimp_file_get_utf8_name (file));
  palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
  g_free (palette_name);

  lseek (fd, 16, SEEK_SET);
  data_size = read (fd, buffer, sizeof (buffer) - 1);
  buffer[data_size] = '\0';

  lines = g_strsplit (buffer, "\x0d\x0a", -1);

  number_of_colors = atoi (lines[0]);

  for (i = 0; i < number_of_colors; i++)
    {
      if (lines[i + 1] == NULL)
        {
          g_printerr ("Premature end of file reading %s.",
                      gimp_file_get_utf8_name (file));
          break;
        }

      ascii_colors = g_strsplit (lines[i + 1], " ", 3);
      color_ok = TRUE;

      for (j = 0 ; j < 3; j++)
        {
          if (ascii_colors[j] == NULL)
            {
              g_printerr ("Corrupted palette file %s.",
                          gimp_file_get_utf8_name (file));
              color_ok = FALSE;
              break;
            }

          color_bytes[j] = atoi (ascii_colors[j]);
        }

      if (color_ok)
        {
          GimpRGB color;

          gimp_rgba_set_uchar (&color,
                               color_bytes[0],
                               color_bytes[1],
                               color_bytes[2],
                               255);
          gimp_palette_add_entry (palette, -1, NULL, &color);
        }

      g_strfreev (ascii_colors);
    }

  g_strfreev (lines);

  return g_list_prepend (NULL, palette);
}

GList *
gimp_palette_load_aco (GimpContext  *context,
                       GFile        *file,
                       FILE         *f,
                       GError      **error)
{
  GimpPalette *palette;
  gchar       *palette_name;
  gint         fd = fileno (f);
  gint         format_version;
  gint         number_of_colors;
  gint         i;
  gchar        header[4];
  gchar        color_info[10];
  gchar        format2_preamble[4];
  gint         status;

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  status = read (fd, header, sizeof (header));

  if (status != sizeof (header))
    {
      g_set_error (error,
                   GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
                   _("Could not read header from palette file '%s'"),
                   gimp_file_get_utf8_name (file));
      return NULL;
    }

  palette_name = g_path_get_basename (gimp_file_get_utf8_name (file));
  palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
  g_free (palette_name);

  format_version = header[1] + (header[0] << 8);
  number_of_colors = header[3] + (header[2] << 8);

  for (i = 0; i < number_of_colors; i++)
    {
      gint     color_space;
      gint     w, x, y, z;
      gboolean color_ok = FALSE;
      GimpRGB  color;

      if (read (fd, color_info, sizeof (color_info)) != sizeof (color_info))
	{
          g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
                       _("Fatal parse error in palette file '%s'"),
                       gimp_file_get_utf8_name (file));
          g_object_unref (palette);
          return NULL;
	}

      color_space = color_info[1] + (color_info[0] << 8);

      w = (guchar) color_info[3] + ((guchar) color_info[2] << 8);
      x = (guchar) color_info[5] + ((guchar) color_info[4] << 8);
      y = (guchar) color_info[7] + ((guchar) color_info[6] << 8);
      z = (guchar) color_info[9] + ((guchar) color_info[8] << 8);

      if (color_space == 0) /* RGB */
        {
          gdouble R = ((gdouble) w) / 65536.0;
          gdouble G = ((gdouble) x) / 65536.0;
          gdouble B = ((gdouble) y) / 65536.0;

          gimp_rgba_set (&color, R, G, B, 1.0);

          color_ok = TRUE;
        }
      else if (color_space == 1) /* HSV */
        {
          GimpHSV hsv;

          gdouble H = ((gdouble) w) / 65536.0;
          gdouble S = ((gdouble) x) / 65536.0;
          gdouble V = ((gdouble) y) / 65536.0;

          gimp_hsva_set (&hsv, H, S, V, 1.0);
          gimp_hsv_to_rgb (&hsv, &color);

          color_ok = TRUE;
        }
      else if (color_space == 2) /* CMYK */
        {
          GimpCMYK cmyk;

          gdouble C = 1.0 - (((gdouble) w) / 65536.0);
          gdouble M = 1.0 - (((gdouble) x) / 65536.0);
          gdouble Y = 1.0 - (((gdouble) y) / 65536.0);
          gdouble K = 1.0 - (((gdouble) z) / 65536.0);

          gimp_cmyka_set (&cmyk, C, M, Y, K, 1.0);
          gimp_cmyk_to_rgb (&cmyk, &color);

          color_ok = TRUE;
        }
      else if (color_space == 8) /* Grayscale */
        {
          gdouble K = 1.0 - (((gdouble) w) / 10000.0);

          gimp_rgba_set (&color, K, K, K, 1.0);

          color_ok = TRUE;
        }
      else if (color_space == 9) /* Wide? CMYK */
        {
          GimpCMYK cmyk;

          gdouble C = 1.0 - (((gdouble) w) / 10000.0);
          gdouble M = 1.0 - (((gdouble) x) / 10000.0);
          gdouble Y = 1.0 - (((gdouble) y) / 10000.0);
          gdouble K = 1.0 - (((gdouble) z) / 10000.0);

          gimp_cmyka_set (&cmyk, C, M, Y, K, 1.0);
          gimp_cmyk_to_rgb (&cmyk, &color);

          color_ok = TRUE;
        }
      else
        {
          g_printerr ("Unsupported color space (%d) in ACO file %s\n",
                      color_space, gimp_file_get_utf8_name (file));
        }

      if (format_version == 2)
        {
          gint number_of_chars;

	  if (read (fd,
		    format2_preamble,
		    sizeof (format2_preamble)) != sizeof (format2_preamble))
	    {
	      g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
			   _("Fatal parse error in palette file '%s'"),
			   gimp_file_get_utf8_name (file));
	      g_object_unref (palette);
	      return NULL;
	    }

          number_of_chars = format2_preamble[3] + (format2_preamble[2] << 8);
          lseek (fd, number_of_chars * 2, SEEK_SET);
        }

      if (color_ok)
        gimp_palette_add_entry (palette, -1, NULL, &color);
    }

  return g_list_prepend (NULL, palette);
}


GList *
gimp_palette_load_css (GimpContext  *context,
                       GFile        *file,
                       FILE         *f,
                       GError      **error)
{
  GimpPalette *palette;
  gchar       *name;
  GRegex      *regex;
  GimpRGB      color;

  g_return_val_if_fail (G_IS_FILE (file), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  regex = g_regex_new (".*color.*:(?P<param>.*);", G_REGEX_CASELESS, 0, error);
  if (! regex)
    return NULL;

  name = g_path_get_basename (gimp_file_get_utf8_name (file));
  palette = GIMP_PALETTE (gimp_palette_new (context, name));
  g_free (name);

  do
    {
      GMatchInfo *matches;
      gchar       buf[1024];

      if (fgets (buf, sizeof (buf), f) != NULL)
        {
          if (g_regex_match (regex, buf, 0, &matches))
            {
              gchar *word = g_match_info_fetch_named (matches, "param");

              if (gimp_rgb_parse_css (&color, word, -1))
                {
                  if (! gimp_palette_find_entry (palette, &color, NULL))
                    {
                      gimp_palette_add_entry (palette, -1, NULL, &color);
                    }
                }

              g_free (word);
            }
        }
    } while (! feof (f));

  g_regex_unref (regex);

  return g_list_prepend (NULL, palette);
}

GimpPaletteFileFormat
gimp_palette_load_detect_format (GFile *file,
                                 FILE  *f)
{
  GimpPaletteFileFormat format = GIMP_PALETTE_FILE_FORMAT_UNKNOWN;
  gint                  fd = fileno (f);
  gchar                 header[16];

  if (fread (header, 1, sizeof (header), f) == sizeof (header))
    {
      if (g_str_has_prefix (header + 0, "RIFF") &&
          g_str_has_prefix (header + 8, "PAL data"))
        {
          format = GIMP_PALETTE_FILE_FORMAT_RIFF_PAL;
        }
      else if (g_str_has_prefix (header, "GIMP Palette"))
        {
          format = GIMP_PALETTE_FILE_FORMAT_GPL;
        }
      else if (g_str_has_prefix (header, "JASC-PAL"))
        {
          format = GIMP_PALETTE_FILE_FORMAT_PSP_PAL;
        }
    }

  if (format == GIMP_PALETTE_FILE_FORMAT_UNKNOWN)
    {
      gchar *lower_filename =
        g_ascii_strdown (gimp_file_get_utf8_name (file), -1);

      if (g_str_has_suffix (lower_filename, ".aco"))
        {
          format = GIMP_PALETTE_FILE_FORMAT_ACO;
        }
      else if (g_str_has_suffix (lower_filename, ".css"))
        {
          format = GIMP_PALETTE_FILE_FORMAT_CSS;
        }

      g_free (lower_filename);
    }

  if (format == GIMP_PALETTE_FILE_FORMAT_UNKNOWN)
    {
      struct stat file_stat;

      if (fstat (fd, &file_stat) >= 0)
        {
          if (file_stat.st_size == 768)
            format = GIMP_PALETTE_FILE_FORMAT_ACT;
        }
    }

  rewind (f);

  return format;
}