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


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