pixbuf-lowmem.c 5.75 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
/* -*- Mode: C; c-basic-offset: 2; -*- */
/* GdkPixbuf library - test loaders
 *
 * Copyright (C) 2001 Sren Sandmann (sandmann@daimi.au.dk)
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#include <config.h>
#include "gdk-pixbuf/gdk-pixbuf.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#define PRETEND_MEM_SIZE (16 * 1024 * 1024)
#define REMAINING_MEM_SIZE 100000


static int current_allocation = 0;
static int max_allocation = 0;

#define HEADER_SPACE sizeof(void*)

static gpointer
record_bytes (gpointer mem, gsize bytes)
{
  if (mem == NULL ||
      (current_allocation + bytes) > max_allocation)
    {
      if (mem)
        free (mem);
      
      return NULL;
    }
  
  *(void **)mem = GINT_TO_POINTER (bytes);

  g_assert (GPOINTER_TO_INT (*(void**)mem) == bytes);
  
  g_assert (current_allocation >= 0);
  current_allocation += bytes;
  g_assert (current_allocation >= 0);
  
  g_assert ( mem == (void*) ((((char*)mem) + HEADER_SPACE) - HEADER_SPACE) );
  return ((char*)mem) + HEADER_SPACE;
}

static gpointer
limited_try_malloc (gsize n_bytes)
{
  return record_bytes (malloc (n_bytes + HEADER_SPACE), n_bytes);
}

static gpointer
limited_malloc (gsize n_bytes)
{
  return limited_try_malloc (n_bytes);
}

static gpointer
limited_calloc (gsize n_blocks,
                gsize n_block_bytes)
{
  int bytes = n_blocks * n_block_bytes + HEADER_SPACE;
  gpointer mem = malloc (bytes);
  memset (mem, 0, bytes);
  return record_bytes (mem, n_blocks * n_block_bytes);
}

static void
limited_free (gpointer mem)
{
  gpointer real = ((char*)mem) - HEADER_SPACE;

  g_assert (current_allocation >= 0);
  current_allocation -= GPOINTER_TO_INT (*(void**)real);
  g_assert (current_allocation >= 0);
  
  free (real);
}

static gpointer
limited_try_realloc (gpointer mem,
                     gsize    n_bytes)
{
  if (mem == NULL)
    {
      return limited_try_malloc (n_bytes);
    }
  else
    {
      gpointer real;

      g_assert (mem);

      real = ((char*)mem) - HEADER_SPACE;
      
      g_assert (current_allocation >= 0);
      current_allocation -= GPOINTER_TO_INT (*(void**)real);
      g_assert (current_allocation >= 0);

      return record_bytes (realloc (real, n_bytes + HEADER_SPACE), n_bytes);
    }
}

static gpointer
limited_realloc (gpointer mem,
                 gsize    n_bytes)
{
  return limited_try_realloc (mem, n_bytes);
}

static GMemVTable limited_table = {
  limited_malloc,
  limited_realloc,
  limited_free,
  limited_calloc,
  limited_try_malloc,
  limited_try_realloc
};

static void
mem_test (const guchar *bytes, gsize len)
{
  gboolean did_fail = FALSE;
  GError *err = NULL;
  GdkPixbufLoader *loader; 
  GList *loaders = NULL;
  GList *i;
  
  do {
    loader = gdk_pixbuf_loader_new ();
    gdk_pixbuf_loader_write (loader, bytes, len, &err);
    if (err)
      {
	g_error_free (err);
	err = NULL;
	did_fail = TRUE;
      }
    gdk_pixbuf_loader_close (loader, NULL);
    if (err)
      {
	g_error_free (err);
	err = NULL;
	did_fail = TRUE;
      }
    loaders = g_list_prepend (loaders, loader);
  } while (!did_fail);
  
  for (i = loaders; i != NULL; i = i->next)
    g_object_unref (i->data);
  g_list_free (loaders);
}

static void
almost_exhaust_memory (void)
{
  gpointer x = g_malloc (REMAINING_MEM_SIZE);
  while (g_try_malloc (REMAINING_MEM_SIZE / 10))
    ;
  g_free (x);
}

static void
usage (void)
{
  g_print ("usage: pixbuf-lowmem <pretend_memory_size> <files>\n");
  exit (EXIT_FAILURE);
}

int
main (int argc, char **argv)
{
  int i;
  char *endptr;

  if (argc <= 2)
    usage();
  
  max_allocation = strtol (argv[1], &endptr, 10);
  if (endptr == argv[1])
    usage();

  /* Set a malloc which emulates low mem */
  g_mem_set_vtable (&limited_table);
  
  g_type_init ();
  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
  
  /* memory tests */

  /* How do the loaders behave when memory is low?
     It depends on the state the above tests left the 
     memory in.

     - Sometimes the png loader tries to report an 
       "out of memory", but then g_strdup_printf() calls
       g_malloc(), which fails.
       
     - There are unchecked realloc()s inside libtiff, which means it
       will never work with low memory, unless something drastic is
       done, like allocating a lot of memory upfront and release it
       before entering libtiff.  Also, some TIFFReadRGBAImage calls
       returns successfully, even though they have called the error
       handler with an 'out of memory' message.
  */

  almost_exhaust_memory ();

  g_print ("Allocated %dK of %dK, %dK free during tests\n",
           current_allocation / 1024, max_allocation / 1024,
           (max_allocation - current_allocation) / 1024);

  for (i = 2; i < argc; ++i)
    {
      gchar *contents;
      gsize size;
      GError *err = NULL;

      if (!g_file_get_contents (argv[i], &contents, &size, &err))
	{
	  g_print ("couldn't read %s: %s\n", argv[i], err->message);
	  exit (EXIT_FAILURE);
	}
      else
	{
	  g_print ("%-40s memory            ", argv[i]);
	  fflush (stdout);
	  mem_test (contents, size);
	  g_print ("\tpassed\n");
	  g_free (contents);
	}
    }
  
  return 0;
}