402 lines
9.6 KiB
C
402 lines
9.6 KiB
C
/* gtkiconcachevalidator.c
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* Copyright (C) 2007 Red Hat, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkiconcachevalidatorprivate.h"
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#include <glib.h>
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#include <gdk-pixbuf/gdk-pixdata.h>
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#define VERBOSE(x)
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#define check(name,condition) \
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if (!(condition)) \
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{ \
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VERBOSE(g_message ("bad %s", (name))); \
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return FALSE; \
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}
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static inline gboolean
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get_uint16 (CacheInfo *info,
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guint32 offset,
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guint16 *value)
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{
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if (offset < info->cache_size)
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{
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*value = GUINT16_FROM_BE(*(guint16*)(info->cache + offset));
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return TRUE;
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}
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else
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{
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*value = 0;
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return FALSE;
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}
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}
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static inline gboolean
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get_uint32 (CacheInfo *info,
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guint32 offset,
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guint32 *value)
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{
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if (offset < info->cache_size)
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{
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*value = GUINT32_FROM_BE(*(guint32*)(info->cache + offset));
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return TRUE;
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}
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else
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{
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*value = 0;
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return FALSE;
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}
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}
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static gboolean
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check_version (CacheInfo *info)
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{
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guint16 major, minor;
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check ("major version", get_uint16 (info, 0, &major) && major == 1);
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check ("minor version", get_uint16 (info, 2, &minor) && minor == 0);
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return TRUE;
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}
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static gboolean
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check_string (CacheInfo *info,
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guint32 offset)
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{
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check ("string offset", offset < info->cache_size);
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if (info->flags & CHECK_STRINGS)
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{
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int i;
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char c;
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/* assume no string is longer than 1k */
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for (i = 0; i < 1024; i++)
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{
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check ("string offset", offset + i < info->cache_size)
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c = *(info->cache + offset + i);
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if (c == '\0')
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break;
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check ("string content", g_ascii_isgraph (c));
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}
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check ("string length", i < 1024);
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}
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return TRUE;
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}
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static gboolean
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check_string_utf8 (CacheInfo *info,
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guint32 offset)
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{
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check ("string offset", offset < info->cache_size);
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if (info->flags & CHECK_STRINGS)
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{
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int i;
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char c;
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/* assume no string is longer than 1k */
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for (i = 0; i < 1024; i++)
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{
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check ("string offset", offset + i < info->cache_size)
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c = *(info->cache + offset + i);
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if (c == '\0')
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break;
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}
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check ("string length", i < 1024);
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check ("string utf8 data", g_utf8_validate((char *)(info->cache + offset), -1, NULL));
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}
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return TRUE;
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}
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static gboolean
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check_directory_list (CacheInfo *info,
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guint32 offset)
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{
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guint32 directory_offset;
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int i;
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check ("offset, directory list", get_uint32 (info, offset, &info->n_directories));
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for (i = 0; i < info->n_directories; i++)
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{
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check ("offset, directory", get_uint32 (info, offset + 4 + 4 * i, &directory_offset));
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if (!check_string (info, directory_offset))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_pixel_data (CacheInfo *info,
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guint32 offset)
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{
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guint32 type;
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guint32 length;
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check ("offset, pixel data type", get_uint32 (info, offset, &type));
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check ("offset, pixel data length", get_uint32 (info, offset + 4, &length));
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check ("pixel data type", type == 0);
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check ("pixel data length", offset + 8 + length < info->cache_size);
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if (info->flags & CHECK_PIXBUFS)
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{
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GdkPixdata data;
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G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
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check ("pixel data", gdk_pixdata_deserialize (&data, length,
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(const guint8*)info->cache + offset + 8,
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NULL));
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G_GNUC_END_IGNORE_DEPRECATIONS;
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}
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return TRUE;
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}
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static gboolean
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check_embedded_rect (CacheInfo *info,
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guint32 offset)
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{
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check ("embedded rect", offset + 4 < info->cache_size);
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return TRUE;
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}
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static gboolean
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check_attach_point_list (CacheInfo *info,
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guint32 offset)
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{
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guint32 n_attach_points;
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check ("offset, attach point list", get_uint32 (info, offset, &n_attach_points));
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check ("attach points", offset + 4 + 4 * n_attach_points < info->cache_size);
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return TRUE;
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}
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static gboolean
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check_display_name_list (CacheInfo *info,
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guint32 offset)
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{
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guint32 n_display_names, ofs;
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int i;
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check ("offset, display name list",
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get_uint32 (info, offset, &n_display_names));
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for (i = 0; i < n_display_names; i++)
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{
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get_uint32(info, offset + 4 + 8 * i, &ofs);
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if (!check_string (info, ofs))
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return FALSE;
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get_uint32(info, offset + 4 + 8 * i + 4, &ofs);
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if (!check_string_utf8 (info, ofs))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_meta_data (CacheInfo *info,
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guint32 offset)
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{
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guint32 embedded_rect_offset;
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guint32 attach_point_list_offset;
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guint32 display_name_list_offset;
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check ("offset, embedded rect",
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get_uint32 (info, offset, &embedded_rect_offset));
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check ("offset, attach point list",
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get_uint32 (info, offset + 4, &attach_point_list_offset));
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check ("offset, display name list",
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get_uint32 (info, offset + 8, &display_name_list_offset));
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if (embedded_rect_offset != 0)
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{
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if (!check_embedded_rect (info, embedded_rect_offset))
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return FALSE;
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}
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if (attach_point_list_offset != 0)
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{
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if (!check_attach_point_list (info, attach_point_list_offset))
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return FALSE;
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}
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if (display_name_list_offset != 0)
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{
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if (!check_display_name_list (info, display_name_list_offset))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_image_data (CacheInfo *info,
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guint32 offset)
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{
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guint32 pixel_data_offset;
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guint32 meta_data_offset;
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check ("offset, pixel data", get_uint32 (info, offset, &pixel_data_offset));
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check ("offset, meta data", get_uint32 (info, offset + 4, &meta_data_offset));
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if (pixel_data_offset != 0)
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{
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if (!check_pixel_data (info, pixel_data_offset))
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return FALSE;
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}
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if (meta_data_offset != 0)
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{
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if (!check_meta_data (info, meta_data_offset))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_image (CacheInfo *info,
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guint32 offset)
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{
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guint16 index;
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guint16 flags;
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guint32 image_data_offset;
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check ("offset, image index", get_uint16 (info, offset, &index));
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check ("offset, image flags", get_uint16 (info, offset + 2, &flags));
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check ("offset, image data offset",
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get_uint32 (info, offset + 4, &image_data_offset));
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check ("image index", index < info->n_directories);
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check ("image flags", flags < 16);
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if (image_data_offset != 0)
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{
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if (!check_image_data (info, image_data_offset))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_image_list (CacheInfo *info,
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guint32 offset)
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{
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guint32 n_images;
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int i;
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check ("offset, image list", get_uint32 (info, offset, &n_images));
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for (i = 0; i < n_images; i++)
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{
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if (!check_image (info, offset + 4 + 8 * i))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_icon (CacheInfo *info,
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guint32 offset)
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{
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guint32 chain_offset;
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guint32 name_offset;
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guint32 image_list_offset;
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check ("offset, icon chain", get_uint32 (info, offset, &chain_offset));
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check ("offset, icon name", get_uint32 (info, offset + 4, &name_offset));
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check ("offset, icon image list", get_uint32 (info, offset + 8,
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&image_list_offset));
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if (!check_string (info, name_offset))
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return FALSE;
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if (!check_image_list (info, image_list_offset))
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return FALSE;
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if (chain_offset != 0xffffffff)
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{
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if (!check_icon (info, chain_offset))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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check_hash (CacheInfo *info,
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guint32 offset)
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{
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guint32 n_buckets, icon_offset;
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int i;
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check ("offset, hash size", get_uint32 (info, offset, &n_buckets));
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for (i = 0; i < n_buckets; i++)
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{
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check ("offset, hash chain",
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get_uint32 (info, offset + 4 + 4 * i, &icon_offset));
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if (icon_offset != 0xffffffff)
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{
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if (!check_icon (info, icon_offset))
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return FALSE;
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}
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}
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return TRUE;
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}
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/**
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* gtk_icon_cache_validate:
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* @info: a CacheInfo structure
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*
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* Validates the icon cache passed in the @cache and
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* @cache_size fields of the @info structure. The
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* validator checks that offsets specified in the
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* cache do not point outside the mapped area, that
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* strings look reasonable, and that pixbufs can
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* be deserialized. The amount of validation can
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* be controlled with the @flags field.
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*
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* Returns: %TRUE if the cache is valid
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*/
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gboolean
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gtk_icon_cache_validate (CacheInfo *info)
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{
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guint32 hash_offset;
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guint32 directory_list_offset;
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if (!check_version (info))
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return FALSE;
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check ("header, hash offset", get_uint32 (info, 4, &hash_offset));
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check ("header, directory list offset", get_uint32 (info, 8, &directory_list_offset));
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if (!check_directory_list (info, directory_list_offset))
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return FALSE;
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if (!check_hash (info, hash_offset))
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return FALSE;
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return TRUE;
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}
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