[thirdparty/cups.git] / scheduler / filter.c

/*
 * File type conversion routines for CUPS.
 *
 * Copyright 2007-2011 by Apple Inc.
 * Copyright 1997-2007 by Easy Software Products, all rights reserved.
 *
 * Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
 */

/*
 * Include necessary headers...
 */

#include <cups/string-private.h>
#include "mime.h"


/*
 * Debug macros that used to be private API...
 */

#define DEBUG_puts(x)
#define DEBUG_printf(...)


/*
 * Local types...
 */

typedef struct _mime_typelist_s		/**** List of source types ****/
{
  struct _mime_typelist_s *next;	/* Next source type */
  mime_type_t		*src;		/* Source type */
} _mime_typelist_t;


/*
 * Local functions...
 */

static int		mime_compare_filters(mime_filter_t *, mime_filter_t *);
static int		mime_compare_srcs(mime_filter_t *, mime_filter_t *);
static cups_array_t	*mime_find_filters(mime_t *mime, mime_type_t *src,
				      size_t srcsize, mime_type_t *dst,
				      int *cost, _mime_typelist_t *visited);


/*
 * 'mimeAddFilter()' - Add a filter to the current MIME database.
 */

mime_filter_t *				/* O - New filter */
mimeAddFilter(mime_t      *mime,	/* I - MIME database */
              mime_type_t *src,		/* I - Source type */
	      mime_type_t *dst,		/* I - Destination type */
              int         cost,		/* I - Relative time/resource cost */
	      const char  *filter)	/* I - Filter program to run */
{
  mime_filter_t	*temp;			/* New filter */


  DEBUG_printf(("mimeAddFilter(mime=%p, src=%p(%s/%s), dst=%p(%s/%s), cost=%d, "
                "filter=\"%s\")", mime,
		src, src ? src->super : "???", src ? src->type : "???",
		dst, dst ? dst->super : "???", dst ? dst->type : "???",
		cost, filter));

 /*
  * Range-check the input...
  */

  if (!mime || !src || !dst || !filter)
  {
    DEBUG_puts("1mimeAddFilter: Returning NULL.");
    return (NULL);
  }

 /*
  * See if we already have an existing filter for the given source and
  * destination...
  */

  if ((temp = mimeFilterLookup(mime, src, dst)) != NULL)
  {
   /*
    * Yup, does the existing filter have a higher cost?  If so, copy the
    * filter and cost to the existing filter entry and return it...
    */

    if (temp->cost > cost)
    {
      DEBUG_printf(("1mimeAddFilter: Replacing filter \"%s\", cost %d.",
                    temp->filter, temp->cost));
      temp->cost = cost;
      strlcpy(temp->filter, filter, sizeof(temp->filter));
    }
  }
  else
  {
   /*
    * Nope, add a new one...
    */

    if (!mime->filters)
      mime->filters = cupsArrayNew((cups_array_func_t)mime_compare_filters, NULL);

    if (!mime->filters)
      return (NULL);

    if ((temp = calloc(1, sizeof(mime_filter_t))) == NULL)
      return (NULL);

   /*
    * Copy the information over and sort if necessary...
    */

    temp->src  = src;
    temp->dst  = dst;
    temp->cost = cost;
    strlcpy(temp->filter, filter, sizeof(temp->filter));

    DEBUG_puts("1mimeAddFilter: Adding new filter.");
    cupsArrayAdd(mime->filters, temp);
    cupsArrayAdd(mime->srcs, temp);
  }

 /*
  * Return the new/updated filter...
  */

  DEBUG_printf(("1mimeAddFilter: Returning %p.", temp));

  return (temp);
}


/*
 * 'mimeFilter()' - Find the fastest way to convert from one type to another.
 */

cups_array_t *				/* O - Array of filters to run */
mimeFilter(mime_t      *mime,		/* I - MIME database */
           mime_type_t *src,		/* I - Source file type */
	   mime_type_t *dst,		/* I - Destination file type */
	   int         *cost)		/* O - Cost of filters */
{
  DEBUG_printf(("mimeFilter(mime=%p, src=%p(%s/%s), dst=%p(%s/%s), "
                "cost=%p(%d))", mime,
        	src, src ? src->super : "???", src ? src->type : "???",
		dst, dst ? dst->super : "???", dst ? dst->type : "???",
		cost, cost ? *cost : 0));

  return (mimeFilter2(mime, src, 0, dst, cost));
}


/*
 * 'mimeFilter2()' - Find the fastest way to convert from one type to another,
 *                   including file size.
 */

cups_array_t *				/* O - Array of filters to run */
mimeFilter2(mime_t      *mime,		/* I - MIME database */
            mime_type_t *src,		/* I - Source file type */
	    size_t      srcsize,	/* I - Size of source file */
	    mime_type_t *dst,		/* I - Destination file type */
	    int         *cost)		/* O - Cost of filters */
{
  cups_array_t	*filters;		/* Array of filters to run */


 /*
  * Range-check the input...
  */

  DEBUG_printf(("mimeFilter2(mime=%p, src=%p(%s/%s), srcsize=" CUPS_LLFMT
                ", dst=%p(%s/%s), cost=%p(%d))", mime,
        	src, src ? src->super : "???", src ? src->type : "???",
		CUPS_LLCAST srcsize,
		dst, dst ? dst->super : "???", dst ? dst->type : "???",
		cost, cost ? *cost : 0));

  if (cost)
    *cost = 0;

  if (!mime || !src || !dst)
    return (NULL);

 /*
  * (Re)build the source lookup array as needed...
  */

  if (!mime->srcs)
  {
    mime_filter_t	*current;	/* Current filter */

    mime->srcs = cupsArrayNew((cups_array_func_t)mime_compare_srcs, NULL);

    for (current = mimeFirstFilter(mime);
         current;
	 current = mimeNextFilter(mime))
      cupsArrayAdd(mime->srcs, current);
  }

 /*
  * Find the filters...
  */

  filters = mime_find_filters(mime, src, srcsize, dst, cost, NULL);

  DEBUG_printf(("1mimeFilter2: Returning %d filter(s), cost %d:",
                cupsArrayCount(filters), cost ? *cost : -1));
#ifdef DEBUG
  {
    mime_filter_t	*filter;	/* Current filter */

    for (filter = (mime_filter_t *)cupsArrayFirst(filters);
         filter;
	 filter = (mime_filter_t *)cupsArrayNext(filters))
      DEBUG_printf(("1mimeFilter2: %s/%s %s/%s %d %s", filter->src->super,
                    filter->src->type, filter->dst->super, filter->dst->type,
		    filter->cost, filter->filter));
  }
#endif /* DEBUG */

  return (filters);
}


/*
 * 'mimeFilterLookup()' - Lookup a filter.
 */

mime_filter_t *				/* O - Filter for src->dst */
mimeFilterLookup(mime_t      *mime,	/* I - MIME database */
                 mime_type_t *src,	/* I - Source type */
                 mime_type_t *dst)	/* I - Destination type */
{
  mime_filter_t	key,			/* Key record for filter search */
		*filter;		/* Matching filter */


  DEBUG_printf(("2mimeFilterLookup(mime=%p, src=%p(%s/%s), dst=%p(%s/%s))", mime,
                src, src ? src->super : "???", src ? src->type : "???",
		dst, dst ? dst->super : "???", dst ? dst->type : "???"));

  key.src = src;
  key.dst = dst;

  filter = (mime_filter_t *)cupsArrayFind(mime->filters, &key);
  DEBUG_printf(("3mimeFilterLookup: Returning %p(%s).", filter,
                filter ? filter->filter : "???"));
  return (filter);
}


/*
 * 'mime_compare_filters()' - Compare two filters.
 */

static int				/* O - Comparison result */
mime_compare_filters(mime_filter_t *f0,	/* I - First filter */
                     mime_filter_t *f1)	/* I - Second filter */
{
  int	i;				/* Result of comparison */


  if ((i = strcmp(f0->src->super, f1->src->super)) == 0)
    if ((i = strcmp(f0->src->type, f1->src->type)) == 0)
      if ((i = strcmp(f0->dst->super, f1->dst->super)) == 0)
        i = strcmp(f0->dst->type, f1->dst->type);

  return (i);
}


/*
 * 'mime_compare_srcs()' - Compare two filter source types.
 */

static int				/* O - Comparison result */
mime_compare_srcs(mime_filter_t *f0,	/* I - First filter */
                  mime_filter_t *f1)	/* I - Second filter */
{
  int	i;				/* Result of comparison */


  if ((i = strcmp(f0->src->super, f1->src->super)) == 0)
    i = strcmp(f0->src->type, f1->src->type);

  return (i);
}


/*
 * 'mime_find_filters()' - Find the filters to convert from one type to another.
 */

static cups_array_t *			/* O - Array of filters to run */
mime_find_filters(
    mime_t           *mime,		/* I - MIME database */
    mime_type_t      *src,		/* I - Source file type */
    size_t           srcsize,		/* I - Size of source file */
    mime_type_t      *dst,		/* I - Destination file type */
    int              *cost,		/* O - Cost of filters */
    _mime_typelist_t *list)		/* I - Source types we've used */
{
  int			tempcost,	/* Temporary cost */
			mincost;	/* Current minimum */
  cups_array_t		*temp,		/* Temporary filter */
			*mintemp;	/* Current minimum */
  mime_filter_t		*current,	/* Current filter */
			srckey;		/* Source type key */
  _mime_typelist_t	listnode,	/* New list node */
			*listptr;	/* Pointer in list */


  DEBUG_printf(("2mime_find_filters(mime=%p, src=%p(%s/%s), srcsize=" CUPS_LLFMT
                ", dst=%p(%s/%s), cost=%p, list=%p)", mime, src, src->super,
		src->type, CUPS_LLCAST srcsize, dst, dst->super, dst->type,
		cost, list));

 /*
  * See if there is a filter that can convert the files directly...
  */

  if ((current = mimeFilterLookup(mime, src, dst)) != NULL &&
      (current->maxsize == 0 || srcsize <= current->maxsize))
  {
   /*
    * Got a direct filter!
    */

    DEBUG_puts("3mime_find_filters: Direct filter found.");

    if ((mintemp = cupsArrayNew(NULL, NULL)) == NULL)
    {
      DEBUG_puts("3mime_find_filters: Returning NULL (out of memory).");
      return (NULL);
    }

    cupsArrayAdd(mintemp, current);

    mincost = current->cost;

    if (!cost)
    {
      DEBUG_printf(("3mime_find_filters: Returning 1 filter, cost %d:",
                    mincost));
      DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
                    current->src->super, current->src->type,
                    current->dst->super, current->dst->type,
		    current->cost, current->filter));
      return (mintemp);
    }
  }
  else
  {
   /*
    * No direct filter...
    */

    mintemp = NULL;
    mincost = 9999999;
  }

 /*
  * Initialize this node in the type list...
  */

  listnode.next = list;

 /*
  * OK, now look for filters from the source type to any other type...
  */

  srckey.src = src;

  for (current = (mime_filter_t *)cupsArrayFind(mime->srcs, &srckey);
       current && current->src == src;
       current = (mime_filter_t *)cupsArrayNext(mime->srcs))
  {
   /*
    * See if we have already tried the destination type as a source
    * type (this avoids extra filter looping...)
    */

    mime_type_t *current_dst;		/* Current destination type */

    if (current->maxsize > 0 && srcsize > current->maxsize)
      continue;

    for (listptr = list, current_dst = current->dst;
	 listptr;
	 listptr = listptr->next)
      if (current_dst == listptr->src)
	break;

    if (listptr)
      continue;

   /*
    * See if we have any filters that can convert from the destination type
    * of this filter to the final type...
    */

    listnode.src = current->src;

    cupsArraySave(mime->srcs);
    temp = mime_find_filters(mime, current->dst, srcsize, dst, &tempcost,
                             &listnode);
    cupsArrayRestore(mime->srcs);

    if (!temp)
      continue;

    if (!cost)
    {
      DEBUG_printf(("3mime_find_filters: Returning %d filter(s), cost %d:",
		    cupsArrayCount(temp), tempcost));

#ifdef DEBUG
      for (current = (mime_filter_t *)cupsArrayFirst(temp);
	   current;
	   current = (mime_filter_t *)cupsArrayNext(temp))
	DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
		      current->src->super, current->src->type,
		      current->dst->super, current->dst->type,
		      current->cost, current->filter));
#endif /* DEBUG */

      return (temp);
    }

   /*
    * Found a match; see if this one is less costly than the last (if
    * any...)
    */

    tempcost += current->cost;

    if (tempcost < mincost)
    {
      cupsArrayDelete(mintemp);

     /*
      * Hey, we got a match!  Add the current filter to the beginning of the
      * filter list...
      */

      mintemp = temp;
      mincost = tempcost;
      cupsArrayInsert(mintemp, current);
    }
    else
      cupsArrayDelete(temp);
  }

  if (mintemp)
  {
   /*
    * Hey, we got a match!
    */

    DEBUG_printf(("3mime_find_filters: Returning %d filter(s), cost %d:",
                  cupsArrayCount(mintemp), mincost));

#ifdef DEBUG
    for (current = (mime_filter_t *)cupsArrayFirst(mintemp);
         current;
	 current = (mime_filter_t *)cupsArrayNext(mintemp))
      DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
                    current->src->super, current->src->type,
                    current->dst->super, current->dst->type,
		    current->cost, current->filter));
#endif /* DEBUG */

    if (cost)
      *cost = mincost;

    return (mintemp);
  }

  DEBUG_puts("3mime_find_filters: Returning NULL (no matches).");

  return (NULL);
}
Commit	Line	Data
ef416fc2	1	/*
503b54c9	2	* File type conversion routines for CUPS.
ef416fc2	3	*
503b54c9 MS	4	* Copyright 2007-2011 by Apple Inc.
503b54c9 MS	5	* Copyright 1997-2007 by Easy Software Products, all rights reserved.
ef416fc2	6	*
e3101897	7	* Licensed under Apache License v2.0. See the file "LICENSE" for more information.
ef416fc2	8	*/
	9
	10	/*
	11	* Include necessary headers...
	12	*/
	13
71e16022	14	#include <cups/string-private.h>
ef416fc2	15	#include "mime.h"
	16
	17
fb863569 MS	18	/*
	19	* Debug macros that used to be private API...
	20	*/
	21
	22	#define DEBUG_puts(x)
	23	#define DEBUG_printf(...)
	24
	25
bd7854cb	26	/*
	27	* Local types...
	28	*/
	29
	30	typedef struct _mime_typelist_s /** List of source types **/
	31	{
	32	struct _mime_typelist_s next; / Next source type */
	33	mime_type_t src; / Source type */
	34	} _mime_typelist_t;
	35
	36
ef416fc2	37	/*
	38	* Local functions...
	39	*/
	40
22c9029b MS	41	static int mime_compare_filters(mime_filter_t , mime_filter_t );
	42	static int mime_compare_srcs(mime_filter_t , mime_filter_t );
	43	static cups_array_t mime_find_filters(mime_t mime, mime_type_t *src,
07ed0e9a MS	44	size_t srcsize, mime_type_t *dst,
07ed0e9a MS	45	int cost, _mime_typelist_t visited);
ef416fc2	46
	47
	48	/*
	49	* 'mimeAddFilter()' - Add a filter to the current MIME database.
	50	*/
	51
	52	mime_filter_t * /* O - New filter */
	53	mimeAddFilter(mime_t mime, / I - MIME database */
	54	mime_type_t src, / I - Source type */
	55	mime_type_t dst, / I - Destination type */
	56	int cost, /* I - Relative time/resource cost */
	57	const char filter) / I - Filter program to run */
	58	{
	59	mime_filter_t temp; / New filter */
	60
	61
22c9029b MS	62	DEBUG_printf(("mimeAddFilter(mime=%p, src=%p(%s/%s), dst=%p(%s/%s), cost=%d, "
	63	"filter=\"%s\")", mime,
	64	src, src ? src->super : "???", src ? src->type : "???",
	65	dst, dst ? dst->super : "???", dst ? dst->type : "???",
	66	cost, filter));
57b7b66b	67
ef416fc2	68	/*
	69	* Range-check the input...
	70	*/
	71
fa73b229	72	if (!mime \|\| !src \|\| !dst \|\| !filter)
22c9029b MS	73	{
22c9029b MS	74	DEBUG_puts("1mimeAddFilter: Returning NULL.");
ef416fc2	75	return (NULL);
22c9029b	76	}
ef416fc2	77
	78	/*
	79	* See if we already have an existing filter for the given source and
	80	* destination...
	81	*/
	82
f7deaa1a	83	if ((temp = mimeFilterLookup(mime, src, dst)) != NULL)
ef416fc2	84	{
	85	/*
	86	* Yup, does the existing filter have a higher cost? If so, copy the
	87	* filter and cost to the existing filter entry and return it...
	88	*/
	89
	90	if (temp->cost > cost)
	91	{
22c9029b MS	92	DEBUG_printf(("1mimeAddFilter: Replacing filter \"%s\", cost %d.",
22c9029b MS	93	temp->filter, temp->cost));
ef416fc2	94	temp->cost = cost;
	95	strlcpy(temp->filter, filter, sizeof(temp->filter));
	96	}
	97	}
	98	else
	99	{
	100	/*
	101	* Nope, add a new one...
	102	*/
	103
fa73b229	104	if (!mime->filters)
22c9029b	105	mime->filters = cupsArrayNew((cups_array_func_t)mime_compare_filters, NULL);
ef416fc2	106
fa73b229	107	if (!mime->filters)
ef416fc2	108	return (NULL);
ef416fc2	109
fa73b229	110	if ((temp = calloc(1, sizeof(mime_filter_t))) == NULL)
fa73b229	111	return (NULL);
ef416fc2	112
	113	/*
	114	* Copy the information over and sort if necessary...
	115	*/
	116
	117	temp->src = src;
	118	temp->dst = dst;
	119	temp->cost = cost;
	120	strlcpy(temp->filter, filter, sizeof(temp->filter));
	121
22c9029b	122	DEBUG_puts("1mimeAddFilter: Adding new filter.");
fa73b229	123	cupsArrayAdd(mime->filters, temp);
22c9029b	124	cupsArrayAdd(mime->srcs, temp);
ef416fc2	125	}
	126
	127	/*
	128	* Return the new/updated filter...
	129	*/
	130
22c9029b MS	131	DEBUG_printf(("1mimeAddFilter: Returning %p.", temp));
22c9029b MS	132
ef416fc2	133	return (temp);
	134	}
	135
	136
	137	/*
	138	* 'mimeFilter()' - Find the fastest way to convert from one type to another.
	139	*/
	140
fa73b229	141	cups_array_t * /* O - Array of filters to run */
ef416fc2	142	mimeFilter(mime_t mime, / I - MIME database */
	143	mime_type_t src, / I - Source file type */
	144	mime_type_t dst, / I - Destination file type */
bd7854cb	145	int cost) / O - Cost of filters */
ef416fc2	146	{
fa73b229	147	DEBUG_printf(("mimeFilter(mime=%p, src=%p(%s/%s), dst=%p(%s/%s), "
22c9029b MS	148	"cost=%p(%d))", mime,
	149	src, src ? src->super : "???", src ? src->type : "???",
	150	dst, dst ? dst->super : "???", dst ? dst->type : "???",
bd7854cb	151	cost, cost ? *cost : 0));
bd7854cb	152
07ed0e9a MS	153	return (mimeFilter2(mime, src, 0, dst, cost));
	154	}
	155
	156
	157	/*
	158	* 'mimeFilter2()' - Find the fastest way to convert from one type to another,
	159	* including file size.
	160	*/
	161
	162	cups_array_t * /* O - Array of filters to run */
	163	mimeFilter2(mime_t mime, / I - MIME database */
	164	mime_type_t src, / I - Source file type */
	165	size_t srcsize, /* I - Size of source file */
	166	mime_type_t dst, / I - Destination file type */
	167	int cost) / O - Cost of filters */
	168	{
22c9029b MS	169	cups_array_t filters; / Array of filters to run */
	170
	171
07ed0e9a MS	172	/*
	173	* Range-check the input...
	174	*/
	175
	176	DEBUG_printf(("mimeFilter2(mime=%p, src=%p(%s/%s), srcsize=" CUPS_LLFMT
22c9029b MS	177	", dst=%p(%s/%s), cost=%p(%d))", mime,
	178	src, src ? src->super : "???", src ? src->type : "???",
	179	CUPS_LLCAST srcsize,
	180	dst, dst ? dst->super : "???", dst ? dst->type : "???",
	181	cost, cost ? *cost : 0));
ef416fc2	182
fa73b229	183	if (cost)
fa73b229	184	*cost = 0;
ef416fc2	185
bd7854cb	186	if (!mime \|\| !src \|\| !dst)
fa73b229	187	return (NULL);
ef416fc2	188
a74454a7	189	/*
	190	* (Re)build the source lookup array as needed...
	191	*/
	192
	193	if (!mime->srcs)
	194	{
	195	mime_filter_t current; / Current filter */
	196
22c9029b	197	mime->srcs = cupsArrayNew((cups_array_func_t)mime_compare_srcs, NULL);
a74454a7	198
	199	for (current = mimeFirstFilter(mime);
	200	current;
	201	current = mimeNextFilter(mime))
	202	cupsArrayAdd(mime->srcs, current);
	203	}
	204
bd7854cb	205	/*
	206	* Find the filters...
	207	*/
	208
22c9029b MS	209	filters = mime_find_filters(mime, src, srcsize, dst, cost, NULL);
	210
	211	DEBUG_printf(("1mimeFilter2: Returning %d filter(s), cost %d:",
	212	cupsArrayCount(filters), cost ? *cost : -1));
	213	#ifdef DEBUG
	214	{
	215	mime_filter_t filter; / Current filter */
	216
	217	for (filter = (mime_filter_t *)cupsArrayFirst(filters);
	218	filter;
	219	filter = (mime_filter_t *)cupsArrayNext(filters))
	220	DEBUG_printf(("1mimeFilter2: %s/%s %s/%s %d %s", filter->src->super,
	221	filter->src->type, filter->dst->super, filter->dst->type,
	222	filter->cost, filter->filter));
	223	}
	224	#endif /* DEBUG */
	225
	226	return (filters);
bd7854cb	227	}
	228
	229
f7deaa1a	230	/*
07ed0e9a	231	* 'mimeFilterLookup()' - Lookup a filter.
f7deaa1a	232	*/
	233
	234	mime_filter_t * /* O - Filter for src->dst */
	235	mimeFilterLookup(mime_t mime, / I - MIME database */
	236	mime_type_t src, / I - Source type */
	237	mime_type_t dst) / I - Destination type */
	238	{
22c9029b MS	239	mime_filter_t key, /* Key record for filter search */
	240	filter; / Matching filter */
	241
f7deaa1a	242
22c9029b MS	243	DEBUG_printf(("2mimeFilterLookup(mime=%p, src=%p(%s/%s), dst=%p(%s/%s))", mime,
	244	src, src ? src->super : "???", src ? src->type : "???",
	245	dst, dst ? dst->super : "???", dst ? dst->type : "???"));
f7deaa1a	246
	247	key.src = src;
	248	key.dst = dst;
	249
22c9029b MS	250	filter = (mime_filter_t *)cupsArrayFind(mime->filters, &key);
	251	DEBUG_printf(("3mimeFilterLookup: Returning %p(%s).", filter,
	252	filter ? filter->filter : "???"));
	253	return (filter);
f7deaa1a	254	}
	255
	256
bd7854cb	257	/*
22c9029b	258	* 'mime_compare_filters()' - Compare two filters.
bd7854cb	259	*/
	260
	261	static int /* O - Comparison result */
22c9029b MS	262	mime_compare_filters(mime_filter_t f0, / I - First filter */
22c9029b MS	263	mime_filter_t f1) / I - Second filter */
bd7854cb	264	{
	265	int i; /* Result of comparison */
	266
	267
	268	if ((i = strcmp(f0->src->super, f1->src->super)) == 0)
	269	if ((i = strcmp(f0->src->type, f1->src->type)) == 0)
	270	if ((i = strcmp(f0->dst->super, f1->dst->super)) == 0)
	271	i = strcmp(f0->dst->type, f1->dst->type);
	272
	273	return (i);
	274	}
	275
	276
a74454a7	277	/*
22c9029b	278	* 'mime_compare_srcs()' - Compare two filter source types.
a74454a7	279	*/
	280
	281	static int /* O - Comparison result */
22c9029b MS	282	mime_compare_srcs(mime_filter_t f0, / I - First filter */
22c9029b MS	283	mime_filter_t f1) / I - Second filter */
a74454a7	284	{
	285	int i; /* Result of comparison */
	286
	287
	288	if ((i = strcmp(f0->src->super, f1->src->super)) == 0)
	289	i = strcmp(f0->src->type, f1->src->type);
	290
	291	return (i);
	292	}
	293
	294
bd7854cb	295	/*
22c9029b	296	* 'mime_find_filters()' - Find the filters to convert from one type to another.
bd7854cb	297	*/
bd7854cb	298
b423cd4c	299	static cups_array_t * /* O - Array of filters to run */
22c9029b MS	300	mime_find_filters(
	301	mime_t mime, / I - MIME database */
	302	mime_type_t src, / I - Source file type */
	303	size_t srcsize, /* I - Size of source file */
	304	mime_type_t dst, / I - Destination file type */
	305	int cost, / O - Cost of filters */
	306	_mime_typelist_t list) / I - Source types we've used */
bd7854cb	307	{
	308	int tempcost, /* Temporary cost */
	309	mincost; /* Current minimum */
	310	cups_array_t temp, / Temporary filter */
	311	mintemp; / Current minimum */
a74454a7	312	mime_filter_t current, / Current filter */
a74454a7	313	srckey; /* Source type key */
bd7854cb	314	_mime_typelist_t listnode, /* New list node */
	315	listptr; / Pointer in list */
	316
	317
22c9029b	318	DEBUG_printf(("2mime_find_filters(mime=%p, src=%p(%s/%s), srcsize=" CUPS_LLFMT
07ed0e9a MS	319	", dst=%p(%s/%s), cost=%p, list=%p)", mime, src, src->super,
	320	src->type, CUPS_LLCAST srcsize, dst, dst->super, dst->type,
	321	cost, list));
bd7854cb	322
ef416fc2	323	/*
	324	* See if there is a filter that can convert the files directly...
	325	*/
	326
07ed0e9a MS	327	if ((current = mimeFilterLookup(mime, src, dst)) != NULL &&
07ed0e9a MS	328	(current->maxsize == 0 \|\| srcsize <= current->maxsize))
ef416fc2	329	{
	330	/*
	331	* Got a direct filter!
	332	*/
	333
22c9029b	334	DEBUG_puts("3mime_find_filters: Direct filter found.");
bd7854cb	335
fa73b229	336	if ((mintemp = cupsArrayNew(NULL, NULL)) == NULL)
22c9029b MS	337	{
22c9029b MS	338	DEBUG_puts("3mime_find_filters: Returning NULL (out of memory).");
ef416fc2	339	return (NULL);
22c9029b	340	}
ef416fc2	341
fa73b229	342	cupsArrayAdd(mintemp, current);
	343
	344	mincost = current->cost;
ef416fc2	345
a74454a7	346	if (!cost)
22c9029b MS	347	{
	348	DEBUG_printf(("3mime_find_filters: Returning 1 filter, cost %d:",
	349	mincost));
	350	DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
	351	current->src->super, current->src->type,
	352	current->dst->super, current->dst->type,
	353	current->cost, current->filter));
a74454a7	354	return (mintemp);
22c9029b	355	}
ef416fc2	356	}
	357	else
	358	{
	359	/*
	360	* No direct filter...
	361	*/
	362
fa73b229	363	mintemp = NULL;
fa73b229	364	mincost = 9999999;
ef416fc2	365	}
ef416fc2	366
bd7854cb	367	/*
	368	* Initialize this node in the type list...
	369	*/
	370
	371	listnode.next = list;
	372
ef416fc2	373	/*
	374	* OK, now look for filters from the source type to any other type...
	375	*/
	376
a74454a7	377	srckey.src = src;
bd7854cb	378
a74454a7	379	for (current = (mime_filter_t *)cupsArrayFind(mime->srcs, &srckey);
	380	current && current->src == src;
	381	current = (mime_filter_t *)cupsArrayNext(mime->srcs))
	382	{
	383	/*
	384	* See if we have already tried the destination type as a source
	385	* type (this avoids extra filter looping...)
	386	*/
bd7854cb	387
a74454a7	388	mime_type_t current_dst; / Current destination type */
bd7854cb	389
07ed0e9a MS	390	if (current->maxsize > 0 && srcsize > current->maxsize)
07ed0e9a MS	391	continue;
ef416fc2	392
a74454a7	393	for (listptr = list, current_dst = current->dst;
	394	listptr;
	395	listptr = listptr->next)
	396	if (current_dst == listptr->src)
	397	break;
	398
	399	if (listptr)
	400	continue;
bd7854cb	401
a74454a7	402	/*
	403	* See if we have any filters that can convert from the destination type
	404	* of this filter to the final type...
	405	*/
	406
	407	listnode.src = current->src;
fa73b229	408
a74454a7	409	cupsArraySave(mime->srcs);
22c9029b MS	410	temp = mime_find_filters(mime, current->dst, srcsize, dst, &tempcost,
22c9029b MS	411	&listnode);
a74454a7	412	cupsArrayRestore(mime->srcs);
	413
	414	if (!temp)
	415	continue;
	416
	417	if (!cost)
22c9029b MS	418	{
	419	DEBUG_printf(("3mime_find_filters: Returning %d filter(s), cost %d:",
	420	cupsArrayCount(temp), tempcost));
	421
	422	#ifdef DEBUG
	423	for (current = (mime_filter_t *)cupsArrayFirst(temp);
	424	current;
	425	current = (mime_filter_t *)cupsArrayNext(temp))
	426	DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
	427	current->src->super, current->src->type,
	428	current->dst->super, current->dst->type,
	429	current->cost, current->filter));
	430	#endif /* DEBUG */
	431
a74454a7	432	return (temp);
22c9029b	433	}
a74454a7	434
	435	/*
	436	* Found a match; see if this one is less costly than the last (if
	437	* any...)
	438	*/
	439
ed486911	440	tempcost += current->cost;
ed486911	441
a74454a7	442	if (tempcost < mincost)
	443	{
	444	cupsArrayDelete(mintemp);
ef416fc2	445
ef416fc2	446	/*
a74454a7	447	* Hey, we got a match! Add the current filter to the beginning of the
a74454a7	448	* filter list...
ef416fc2	449	*/
ef416fc2	450
a74454a7	451	mintemp = temp;
ed486911	452	mincost = tempcost;
a74454a7	453	cupsArrayInsert(mintemp, current);
ef416fc2	454	}
a74454a7	455	else
	456	cupsArrayDelete(temp);
	457	}
ef416fc2	458
fa73b229	459	if (mintemp)
ef416fc2	460	{
	461	/*
	462	* Hey, we got a match!
	463	*/
	464
22c9029b MS	465	DEBUG_printf(("3mime_find_filters: Returning %d filter(s), cost %d:",
22c9029b MS	466	cupsArrayCount(mintemp), mincost));
ae71f5de	467
22c9029b	468	#ifdef DEBUG
fa73b229	469	for (current = (mime_filter_t *)cupsArrayFirst(mintemp);
	470	current;
	471	current = (mime_filter_t *)cupsArrayNext(mintemp))
22c9029b MS	472	DEBUG_printf(("3mime_find_filters: %s/%s %s/%s %d %s",
	473	current->src->super, current->src->type,
	474	current->dst->super, current->dst->type,
	475	current->cost, current->filter));
ef416fc2	476	#endif /* DEBUG */
ef416fc2	477
bd7854cb	478	if (cost)
bd7854cb	479	*cost = mincost;
fa73b229	480
ef416fc2	481	return (mintemp);
	482	}
	483
22c9029b	484	DEBUG_puts("3mime_find_filters: Returning NULL (no matches).");
ef416fc2	485
	486	return (NULL);
	487	}