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libcitadel  8.12
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xdgmimecache.h File Reference
#include "xdgmime.h"
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Typedefs

typedef struct _XdgMimeCache

Functions

XdgMimeCache * _xdg_mime_cache_new_from_file (const char *file_name)
XdgMimeCache * _xdg_mime_cache_ref (XdgMimeCache *cache)
void _xdg_mime_cache_unref (XdgMimeCache *cache)
const char * _xdg_mime_cache_get_mime_type_for_data (const void *data, size_t len)
const char * _xdg_mime_cache_get_mime_type_for_file (const char *file_name, struct stat *statbuf)
const char * _xdg_mime_cache_get_mime_type_from_file_name (const char *file_name)
int _xdg_mime_cache_is_valid_mime_type (const char *mime_type)
int _xdg_mime_cache_mime_type_equal (const char *mime_a, const char *mime_b)
int _xdg_mime_cache_media_type_equal (const char *mime_a, const char *mime_b)
int _xdg_mime_cache_mime_type_subclass (const char *mime_a, const char *mime_b)
char ** _xdg_mime_cache_list_mime_parents (const char *mime)
const char * _xdg_mime_cache_unalias_mime_type (const char *mime)
int _xdg_mime_cache_get_max_buffer_extents (void)

Variables

XdgMimeCache ** _xdg_mime_caches

Typedef Documentation

typedef struct _XdgMimeCache

Definition at line 32 of file xdgmimecache.h.


Function Documentation

Definition at line 607 of file xdgmimecache.c.

{
  xdg_uint32_t offset;
  xdg_uint32_t max_extent;
  int i;

  max_extent = 0;
  for (i = 0; _xdg_mime_caches[i]; i++)
    {
      XdgMimeCache *cache = _xdg_mime_caches[i];

      offset = GET_UINT32 (cache->buffer, 24);
      max_extent = MAX (max_extent, GET_UINT32 (cache->buffer, offset + 4));
    }

  return max_extent;
}

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const char* _xdg_mime_cache_get_mime_type_for_data ( const void *  data,
size_t  len 
)

Definition at line 665 of file xdgmimecache.c.

{
  return cache_get_mime_type_for_data (data, len, NULL, 0);
}

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const char* _xdg_mime_cache_get_mime_type_for_file ( const char *  file_name,
struct stat *  statbuf 
)

Definition at line 672 of file xdgmimecache.c.

{
  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;
}

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const char* _xdg_mime_cache_get_mime_type_from_file_name ( const char *  file_name)

Definition at line 741 of file xdgmimecache.c.

{
  const char *mime_types[2];

  if (cache_glob_lookup_file_name (file_name, mime_types, 2) == 1)
    return mime_types[0];
  else
    return XDG_MIME_TYPE_UNKNOWN;
}

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int _xdg_mime_cache_is_valid_mime_type ( const char *  mime_type)
char** _xdg_mime_cache_list_mime_parents ( const char *  mime)

Definition at line 854 of file xdgmimecache.c.

{
  int i, j, p;
  char *all_parents[128]; /* we'll stop at 128 */ 
  char **result;

  mime = xdg_mime_unalias_mime_type (mime);

  p = 0;
  for (i = 0; _xdg_mime_caches[i]; i++)
    {
      XdgMimeCache *cache = _xdg_mime_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)
           {
             int k;
             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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int _xdg_mime_cache_media_type_equal ( const char *  mime_a,
const char *  mime_b 
)
int _xdg_mime_cache_mime_type_equal ( const char *  mime_a,
const char *  mime_b 
)
int _xdg_mime_cache_mime_type_subclass ( const char *  mime_a,
const char *  mime_b 
)

Definition at line 769 of file xdgmimecache.c.

{
  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; _xdg_mime_caches[i]; i++)
    {
      XdgMimeCache *cache = _xdg_mime_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;
}

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XdgMimeCache* _xdg_mime_cache_new_from_file ( const char *  file_name)

Definition at line 110 of file xdgmimecache.c.

{
  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;
}

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XdgMimeCache* _xdg_mime_cache_ref ( XdgMimeCache *  cache)

Definition at line 89 of file xdgmimecache.c.

{
  cache->ref_count++;
  return cache;
}
const char* _xdg_mime_cache_unalias_mime_type ( const char *  mime)

Definition at line 841 of file xdgmimecache.c.

{
  const char *lookup;
  
  lookup = cache_alias_lookup (mime);
  
  if (lookup)
    return lookup;
  
  return mime;  
}

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void _xdg_mime_cache_unref ( XdgMimeCache *  cache)

Definition at line 96 of file xdgmimecache.c.

{
  cache->ref_count--;

  if (cache->ref_count == 0)
    {
#ifdef HAVE_MMAP
      munmap (cache->buffer, cache->size);
#endif
      free (cache);
    }
}

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Variable Documentation

XdgMimeCache** _xdg_mime_caches

Definition at line 60 of file xdgmime.c.