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sugar-toolkit-gtk3/src/sugar3/xdgmimecache.c

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/* -*- mode: C; c-file-style: "gnu" -*- */
/* xdgmimealias.c: Private file. mmappable caches for mime data
*
* More info can be found at http://www.freedesktop.org/standards/
*
* Copyright (C) 2005 Matthias Clasen <mclasen@redhat.com>
*
* Licensed under the Academic Free License version 2.0
* Or under the following terms:
*
* 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 2 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <fnmatch.h>
#include <assert.h>
#include <netinet/in.h> /* for ntohl/ntohs */
#ifdef HAVE_MMAP
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include "xdgmimecache.h"
#include "xdgmimeint.h"
#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#ifndef FALSE
#define FALSE (0)
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif
#ifndef _O_BINARY
#define _O_BINARY 0
#endif
#ifndef MAP_FAILED
#define MAP_FAILED ((void *) -1)
#endif
#define MAJOR_VERSION 1
#define MINOR_VERSION 0
struct _XdgMimeCache
{
int ref_count;
size_t size;
char *buffer;
};
#define GET_UINT16(cache,offset) (ntohs(*(xdg_uint16_t*)((cache) + (offset))))
#define GET_UINT32(cache,offset) (ntohl(*(xdg_uint32_t*)((cache) + (offset))))
XdgMimeCache *
_xdg_mime_cache_ref (XdgMimeCache *cache)
{
cache->ref_count++;
return cache;
}
void
_xdg_mime_cache_unref (XdgMimeCache *cache)
{
cache->ref_count--;
if (cache->ref_count == 0)
{
#ifdef HAVE_MMAP
munmap (cache->buffer, cache->size);
#endif
free (cache);
}
}
XdgMimeCache *
_xdg_mime_cache_new_from_file (const char *file_name)
{
XdgMimeCache *cache = NULL;
#ifdef HAVE_MMAP
int fd = -1;
struct stat st;
char *buffer = NULL;
/* Open the file and map it into memory */
fd = open (file_name, O_RDONLY|_O_BINARY, 0);
if (fd < 0)
return NULL;
if (fstat (fd, &st) < 0 || st.st_size < 4)
goto done;
buffer = (char *) mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (buffer == MAP_FAILED)
goto done;
/* Verify version */
if (GET_UINT16 (buffer, 0) != MAJOR_VERSION ||
GET_UINT16 (buffer, 2) != MINOR_VERSION)
{
munmap (buffer, st.st_size);
goto done;
}
cache = (XdgMimeCache *) malloc (sizeof (XdgMimeCache));
cache->ref_count = 1;
cache->buffer = buffer;
cache->size = st.st_size;
done:
if (fd != -1)
close (fd);
#endif /* HAVE_MMAP */
return cache;
}
static int
cache_magic_matchlet_compare_to_data (XdgMimeCache *cache,
xdg_uint32_t offset,
const void *data,
size_t len)
{
xdg_uint32_t range_start = GET_UINT32 (cache->buffer, offset);
xdg_uint32_t range_length = GET_UINT32 (cache->buffer, offset + 4);
xdg_uint32_t data_length = GET_UINT32 (cache->buffer, offset + 12);
xdg_uint32_t data_offset = GET_UINT32 (cache->buffer, offset + 16);
xdg_uint32_t mask_offset = GET_UINT32 (cache->buffer, offset + 20);
int i, j;
for (i = range_start; i <= range_start + range_length; i++)
{
int valid_matchlet = TRUE;
if (i + data_length > len)
return FALSE;
if (mask_offset)
{
for (j = 0; j < data_length; j++)
{
if ((((unsigned char *)cache->buffer)[data_offset + j] & ((unsigned char *)cache->buffer)[mask_offset + j]) !=
((((unsigned char *) data)[j + i]) & ((unsigned char *)cache->buffer)[mask_offset + j]))
{
valid_matchlet = FALSE;
break;
}
}
}
else
{
for (j = 0; j < data_length; j++)
{
if (((unsigned char *)cache->buffer)[data_offset + j] != ((unsigned char *) data)[j + i])
{
valid_matchlet = FALSE;
break;
}
}
}
if (valid_matchlet)
return TRUE;
}
return FALSE;
}
static int
cache_magic_matchlet_compare (XdgMimeCache *cache,
xdg_uint32_t offset,
const void *data,
size_t len)
{
xdg_uint32_t n_children = GET_UINT32 (cache->buffer, offset + 24);
xdg_uint32_t child_offset = GET_UINT32 (cache->buffer, offset + 28);
int i;
if (cache_magic_matchlet_compare_to_data (cache, offset, data, len))
{
if (n_children == 0)
return TRUE;
for (i = 0; i < n_children; i++)
{
if (cache_magic_matchlet_compare (cache, child_offset + 32 * i,
data, len))
return TRUE;
}
}
return FALSE;
}
static const char *
cache_magic_compare_to_data (XdgMimeCache *cache,
xdg_uint32_t offset,
const void *data,
size_t len,
int *prio)
{
xdg_uint32_t priority = GET_UINT32 (cache->buffer, offset);
xdg_uint32_t mimetype_offset = GET_UINT32 (cache->buffer, offset + 4);
xdg_uint32_t n_matchlets = GET_UINT32 (cache->buffer, offset + 8);
xdg_uint32_t matchlet_offset = GET_UINT32 (cache->buffer, offset + 12);
int i;
for (i = 0; i < n_matchlets; i++)
{
if (cache_magic_matchlet_compare (cache, matchlet_offset + i * 32,
data, len))
{
*prio = priority;
return cache->buffer + mimetype_offset;
}
}
return NULL;
}
static const char *
cache_magic_lookup_data (XdgMimeCache *cache,
const void *data,
size_t len,
int *prio,
const char *mime_types[],
int n_mime_types)
{
xdg_uint32_t list_offset;
xdg_uint32_t n_entries;
xdg_uint32_t offset;
int j, n;
*prio = 0;
list_offset = GET_UINT32 (cache->buffer, 24);
n_entries = GET_UINT32 (cache->buffer, list_offset);
offset = GET_UINT32 (cache->buffer, list_offset + 8);
for (j = 0; j < n_entries; j++)
{
const char *match;
match = cache_magic_compare_to_data (cache, offset + 16 * j,
data, len, prio);
if (match)
return match;
else
{
xdg_uint32_t mimetype_offset;
const char *non_match;
mimetype_offset = GET_UINT32 (cache->buffer, offset + 16 * j + 4);
non_match = cache->buffer + mimetype_offset;
for (n = 0; n < n_mime_types; n++)
{
if (mime_types[n] &&
xdg_mime_mime_type_equal (mime_types[n], non_match))
mime_types[n] = NULL;
}
}
}
return NULL;
}
static const char *
cache_alias_lookup (const char *alias)
{
const char *ptr;
int i, min, max, mid, cmp;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 4);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
xdg_uint32_t offset;
min = 0;
max = n_entries - 1;
while (max >= min)
{
mid = (min + max) / 2;
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * mid);
ptr = cache->buffer + offset;
cmp = strcmp (ptr, alias);
if (cmp < 0)
min = mid + 1;
else if (cmp > 0)
max = mid - 1;
else
{
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * mid + 4);
return cache->buffer + offset;
}
}
}
return NULL;
}
static int
cache_glob_lookup_literal (const char *file_name,
const char *mime_types[],
int n_mime_types)
{
const char *ptr;
int i, min, max, mid, cmp;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 12);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
xdg_uint32_t offset;
min = 0;
max = n_entries - 1;
while (max >= min)
{
mid = (min + max) / 2;
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * mid);
ptr = cache->buffer + offset;
cmp = strcmp (ptr, file_name);
if (cmp < 0)
min = mid + 1;
else if (cmp > 0)
max = mid - 1;
else
{
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * mid + 4);
mime_types[0] = (const char *)(cache->buffer + offset);
return 1;
}
}
}
return 0;
}
static int
cache_glob_lookup_fnmatch (const char *file_name,
const char *mime_types[],
int n_mime_types)
{
const char *mime_type;
const char *ptr;
int i, j, n;
n = 0;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 20);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
for (j = 0; j < n_entries && n < n_mime_types; j++)
{
xdg_uint32_t offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * j);
xdg_uint32_t mimetype_offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * j + 4);
ptr = cache->buffer + offset;
mime_type = cache->buffer + mimetype_offset;
/* FIXME: Not UTF-8 safe */
if (fnmatch (ptr, file_name, 0) == 0)
mime_types[n++] = mime_type;
}
if (n > 0)
return n;
}
return 0;
}
static int
cache_glob_node_lookup_suffix (XdgMimeCache *cache,
xdg_uint32_t n_entries,
xdg_uint32_t offset,
const char *suffix,
int ignore_case,
const char *mime_types[],
int n_mime_types)
{
xdg_unichar_t character;
xdg_unichar_t match_char;
xdg_uint32_t mimetype_offset;
xdg_uint32_t n_children;
xdg_uint32_t child_offset;
int min, max, mid, n, i;
character = _xdg_utf8_to_ucs4 (suffix);
if (ignore_case)
character = _xdg_ucs4_to_lower (character);
min = 0;
max = n_entries - 1;
while (max >= min)
{
mid = (min + max) / 2;
match_char = GET_UINT32 (cache->buffer, offset + 16 * mid);
if (match_char < character)
min = mid + 1;
else if (match_char > character)
max = mid - 1;
else
{
suffix = _xdg_utf8_next_char (suffix);
if (*suffix == '\0')
{
mimetype_offset = GET_UINT32 (cache->buffer, offset + 16 * mid + 4);
n = 0;
if (mimetype_offset)
mime_types[n++] = cache->buffer + mimetype_offset;
n_children = GET_UINT32 (cache->buffer, offset + 16 * mid + 8);
child_offset = GET_UINT32 (cache->buffer, offset + 16 * mid + 12);
i = 0;
while (n < n_mime_types && i < n_children)
{
match_char = GET_UINT32 (cache->buffer, child_offset + 16 * i);
mimetype_offset = GET_UINT32 (cache->buffer, offset + 16 * i + 4);
if (match_char != 0)
break;
mime_types[n++] = cache->buffer + mimetype_offset;
i++;
}
return n;
}
else
{
n_children = GET_UINT32 (cache->buffer, offset + 16 * mid + 8);
child_offset = GET_UINT32 (cache->buffer, offset + 16 * mid + 12);
return cache_glob_node_lookup_suffix (cache,
n_children, child_offset,
suffix, ignore_case,
mime_types,
n_mime_types);
}
}
}
return 0;
}
static int
cache_glob_lookup_suffix (const char *suffix,
int ignore_case,
const char *mime_types[],
int n_mime_types)
{
int i, n;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 16);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
xdg_uint32_t offset = GET_UINT32 (cache->buffer, list_offset + 4);
n = cache_glob_node_lookup_suffix (cache,
n_entries, offset,
suffix, ignore_case,
mime_types,
n_mime_types);
if (n > 0)
return n;
}
return 0;
}
static void
find_stopchars (char *stopchars)
{
int i, j, k, l;
k = 0;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 16);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
xdg_uint32_t offset = GET_UINT32 (cache->buffer, list_offset + 4);
for (j = 0; j < n_entries; j++)
{
xdg_uint32_t match_char = GET_UINT32 (cache->buffer, offset);
if (match_char < 128)
{
for (l = 0; l < k; l++)
if (stopchars[l] == match_char)
break;
if (l == k)
{
stopchars[k] = (char) match_char;
k++;
}
}
offset += 16;
}
}
stopchars[k] = '\0';
}
static int
cache_glob_lookup_file_name (const char *file_name,
const char *mime_types[],
int n_mime_types)
{
const char *ptr;
char stopchars[128];
int n;
assert (file_name != NULL);
/* First, check the literals */
n = cache_glob_lookup_literal (file_name, mime_types, n_mime_types);
if (n > 0)
return n;
find_stopchars (stopchars);
/* Next, check suffixes */
ptr = strpbrk (file_name, stopchars);
while (ptr)
{
n = cache_glob_lookup_suffix (ptr, FALSE, mime_types, n_mime_types);
if (n > 0)
return n;
n = cache_glob_lookup_suffix (ptr, TRUE, mime_types, n_mime_types);
if (n > 0)
return n;
ptr = strpbrk (ptr + 1, stopchars);
}
/* Last, try fnmatch */
return cache_glob_lookup_fnmatch (file_name, mime_types, n_mime_types);
}
int
_xdg_mime_cache_get_max_buffer_extents (void)
{
xdg_uint32_t offset;
xdg_uint32_t max_extent;
int i;
max_extent = 0;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
offset = GET_UINT32 (cache->buffer, 24);
max_extent = MAX (max_extent, GET_UINT32 (cache->buffer, offset + 4));
}
return max_extent;
}
static const char *
cache_get_mime_type_for_data (const void *data,
size_t len,
const char *mime_types[],
int n_mime_types)
{
const char *mime_type;
int i, n, priority;
priority = 0;
mime_type = NULL;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
int prio;
const char *match;
match = cache_magic_lookup_data (cache, data, len, &prio,
mime_types, n_mime_types);
if (prio > priority)
{
priority = prio;
mime_type = match;
}
}
if (priority > 0)
return mime_type;
for (n = 0; n < n_mime_types; n++)
{
if (mime_types[n])
return mime_types[n];
}
return XDG_MIME_TYPE_UNKNOWN;
}
const char *
_xdg_mime_cache_get_mime_type_for_data (const void *data,
size_t len)
{
return cache_get_mime_type_for_data (data, len, NULL, 0);
}
const char *
_xdg_mime_cache_get_mime_type_for_file (const char *file_name,
struct stat *statbuf)
{
const char *mime_type;
const char *mime_types[2];
FILE *file;
unsigned char *data;
int max_extent;
int bytes_read;
struct stat buf;
const char *base_name;
int n;
if (file_name == NULL)
return NULL;
if (! _xdg_utf8_validate (file_name))
return NULL;
base_name = _xdg_get_base_name (file_name);
n = cache_glob_lookup_file_name (base_name, mime_types, 2);
if (n == 1)
return mime_types[0];
if (!statbuf)
{
if (stat (file_name, &buf) != 0)
return XDG_MIME_TYPE_UNKNOWN;
statbuf = &buf;
}
if (!S_ISREG (statbuf->st_mode))
return XDG_MIME_TYPE_UNKNOWN;
/* FIXME: Need to make sure that max_extent isn't totally broken. This could
* be large and need getting from a stream instead of just reading it all
* in. */
max_extent = _xdg_mime_cache_get_max_buffer_extents ();
data = malloc (max_extent);
if (data == NULL)
return XDG_MIME_TYPE_UNKNOWN;
file = fopen (file_name, "r");
if (file == NULL)
{
free (data);
return XDG_MIME_TYPE_UNKNOWN;
}
bytes_read = fread (data, 1, max_extent, file);
if (ferror (file))
{
free (data);
fclose (file);
return XDG_MIME_TYPE_UNKNOWN;
}
mime_type = cache_get_mime_type_for_data (data, bytes_read,
mime_types, n);
free (data);
fclose (file);
return mime_type;
}
const char *
_xdg_mime_cache_get_mime_type_from_file_name (const char *file_name)
{
const char *mime_type;
if (cache_glob_lookup_file_name (file_name, &mime_type, 1))
return mime_type;
else
return XDG_MIME_TYPE_UNKNOWN;
}
#if 1
static int
is_super_type (const char *mime)
{
int length;
const char *type;
length = strlen (mime);
type = &(mime[length - 2]);
if (strcmp (type, "/*") == 0)
return 1;
return 0;
}
#endif
int
_xdg_mime_cache_mime_type_subclass (const char *mime,
const char *base)
{
const char *umime, *ubase;
int i, j, min, max, med, cmp;
umime = _xdg_mime_cache_unalias_mime_type (mime);
ubase = _xdg_mime_cache_unalias_mime_type (base);
if (strcmp (umime, ubase) == 0)
return 1;
/* We really want to handle text/ * in GtkFileFilter, so we just
* turn on the supertype matching
*/
#if 1
/* Handle supertypes */
if (is_super_type (ubase) &&
xdg_mime_media_type_equal (umime, ubase))
return 1;
#endif
/* Handle special cases text/plain and application/octet-stream */
if (strcmp (ubase, "text/plain") == 0 &&
strncmp (umime, "text/", 5) == 0)
return 1;
if (strcmp (ubase, "application/octet-stream") == 0)
return 1;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 8);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
xdg_uint32_t offset, n_parents, parent_offset;
min = 0;
max = n_entries - 1;
while (max >= min)
{
med = (min + max)/2;
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * med);
cmp = strcmp (cache->buffer + offset, umime);
if (cmp < 0)
min = med + 1;
else if (cmp > 0)
max = med - 1;
else
{
offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * med + 4);
n_parents = GET_UINT32 (cache->buffer, offset);
for (j = 0; j < n_parents; j++)
{
parent_offset = GET_UINT32 (cache->buffer, offset + 4 + 4 * j);
if (_xdg_mime_cache_mime_type_subclass (cache->buffer + parent_offset, ubase))
return 1;
}
break;
}
}
}
return 0;
}
const char *
_xdg_mime_cache_unalias_mime_type (const char *mime)
{
const char *lookup;
lookup = cache_alias_lookup (mime);
if (lookup)
return lookup;
return mime;
}
char **
_xdg_mime_cache_list_mime_parents (const char *mime)
{
int i, j, k, p;
char *all_parents[128]; /* we'll stop at 128 */
char **result;
mime = xdg_mime_unalias_mime_type (mime);
p = 0;
for (i = 0; _caches[i]; i++)
{
XdgMimeCache *cache = _caches[i];
xdg_uint32_t list_offset = GET_UINT32 (cache->buffer, 8);
xdg_uint32_t n_entries = GET_UINT32 (cache->buffer, list_offset);
for (j = 0; j < n_entries; j++)
{
xdg_uint32_t mimetype_offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * j);
xdg_uint32_t parents_offset = GET_UINT32 (cache->buffer, list_offset + 4 + 8 * j + 4);
if (strcmp (cache->buffer + mimetype_offset, mime) == 0)
{
xdg_uint32_t parent_mime_offset;
xdg_uint32_t n_parents = GET_UINT32 (cache->buffer, parents_offset);
for (k = 0; k < n_parents && p < 127; k++)
{
parent_mime_offset = GET_UINT32 (cache->buffer, parents_offset + 4 + 4 * k);
all_parents[p++] = cache->buffer + parent_mime_offset;
}
break;
}
}
}
all_parents[p++] = 0;
result = (char **) malloc (p * sizeof (char *));
memcpy (result, all_parents, p * sizeof (char *));
return result;
}
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