unidiff.c

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/*
 * See Licensing and Copyright notice in naev.h
 */
#include <stdlib.h>
 
#include "naev.h"
#include "unidiff.h"
 
#include "conf.h"
#include "array.h"
#include "economy.h"
#include "log.h"
#include "map_overlay.h"
#include "ndata.h"
#include "nstring.h"
#include "nxml.h"
#include "safelanes.h"
#include "space.h"
#include "player.h"
 
typedef struct UniDiffData_ {
   char *name;       
   char *filename;   
} UniDiffData_t;
static UniDiffData_t *diff_available = NULL; 
typedef enum UniHunkTargetType_ {
   HUNK_TARGET_NONE,
   HUNK_TARGET_SYSTEM,
   HUNK_TARGET_SPOB,
   HUNK_TARGET_TECH,
   HUNK_TARGET_FACTION,
} UniHunkTargetType_t;
 
typedef struct UniHunkTarget_ {
   UniHunkTargetType_t type; 
   union {
      char *name; 
   } u; 
} UniHunkTarget_t;
 
typedef enum UniHunkType_ {
   HUNK_TYPE_NONE,
   /* Target should be system. */
   HUNK_TYPE_SPOB_ADD,
   HUNK_TYPE_SPOB_REMOVE,
   HUNK_TYPE_VSPOB_ADD,
   HUNK_TYPE_VSPOB_REMOVE,
   HUNK_TYPE_JUMP_ADD,
   HUNK_TYPE_JUMP_REMOVE,
   HUNK_TYPE_SSYS_BACKGROUND,
   HUNK_TYPE_SSYS_BACKGROUND_REVERT, /* For internal usage. */
   HUNK_TYPE_SSYS_FEATURES,
   HUNK_TYPE_SSYS_FEATURES_REVERT, /* For internal usage. */
   /* Target should be tech. */
   HUNK_TYPE_TECH_ADD,
   HUNK_TYPE_TECH_REMOVE,
   /* Target should be spob. */
   HUNK_TYPE_SPOB_FACTION,
   HUNK_TYPE_SPOB_FACTION_REMOVE, /* For internal usage. */
   HUNK_TYPE_SPOB_POPULATION,
   HUNK_TYPE_SPOB_POPULATION_REMOVE, /* For internal usage. */
   HUNK_TYPE_SPOB_DISPLAYNAME,
   HUNK_TYPE_SPOB_DISPLAYNAME_REVERT, /* For internal usage. */
   HUNK_TYPE_SPOB_DESCRIPTION,
   HUNK_TYPE_SPOB_DESCRIPTION_REVERT, /* For internal usage. */
   HUNK_TYPE_SPOB_BAR,
   HUNK_TYPE_SPOB_BAR_REVERT, /* For internal usage. */
   HUNK_TYPE_SPOB_SERVICE_ADD,
   HUNK_TYPE_SPOB_SERVICE_REMOVE,
   HUNK_TYPE_SPOB_TECH_ADD,
   HUNK_TYPE_SPOB_TECH_REMOVE,
   HUNK_TYPE_SPOB_TAG_ADD,
   HUNK_TYPE_SPOB_TAG_REMOVE,
   HUNK_TYPE_SPOB_SPACE,
   HUNK_TYPE_SPOB_SPACE_REVERT, /* For internal usage. */
   HUNK_TYPE_SPOB_EXTERIOR,
   HUNK_TYPE_SPOB_EXTERIOR_REVERT, /* For internal usage. */
   HUNK_TYPE_SPOB_LUA,
   HUNK_TYPE_SPOB_LUA_REVERT, /* For internal usage. */
   /* Target should be faction. */
   HUNK_TYPE_FACTION_VISIBLE,
   HUNK_TYPE_FACTION_INVISIBLE,
   HUNK_TYPE_FACTION_ALLY,
   HUNK_TYPE_FACTION_ENEMY,
   HUNK_TYPE_FACTION_NEUTRAL,
   HUNK_TYPE_FACTION_REALIGN, /* For internal usage. */
} UniHunkType_t;
 
typedef struct UniHunk_ {
   UniHunkTarget_t target; 
   UniHunkType_t type; 
   xmlNodePtr node; 
   union {
      char *name;
      int data;
   } u; 
   union {
      const char *name; /* We just save the pointer, so keep as const. */
      int data;
   } o; 
} UniHunk_t;
 
typedef struct UniDiff_ {
   char *name;          
   UniHunk_t *applied;  
   UniHunk_t *failed;   
} UniDiff_t;
 
/*
 * Diff stack.
 */
static UniDiff_t *diff_stack = NULL; 
/* Useful variables. */
static int diff_universe_changed = 0; 
static int diff_universe_defer = 0; 
/*
 * Prototypes.
 */
static int diff_applyInternal( const char *name, int oneshot );
NONNULL( 1 ) static UniDiff_t *diff_get( const char *name );
static UniDiff_t *diff_newDiff (void);
static int diff_removeDiff( UniDiff_t *diff );
static int diff_patchSystem( UniDiff_t *diff, xmlNodePtr node );
static int diff_patchTech( UniDiff_t *diff, xmlNodePtr node );
static int diff_patch( xmlNodePtr parent );
static int diff_patchHunk( UniHunk_t *hunk );
static void diff_hunkFailed( UniDiff_t *diff, UniHunk_t *hunk );
static void diff_hunkSuccess( UniDiff_t *diff, UniHunk_t *hunk );
static void diff_cleanup( UniDiff_t *diff );
static void diff_cleanupHunk( UniHunk_t *hunk );
/* Misc. */;
static int diff_checkUpdateUniverse (void);
/* Externed. */
int diff_save( xmlTextWriterPtr writer ); 
int diff_load( xmlNodePtr parent ); 
static int diff_cmp( const void *p1, const void *p2 )
{
   const UniDiffData_t *d1, *d2;
   d1 = (const UniDiffData_t*) p1;
   d2 = (const UniDiffData_t*) p2;
   return strcmp( d1->name, d2->name );
}
 
int diff_loadAvailable (void)
{
   Uint32 time = SDL_GetTicks();
   char **diff_files = ndata_listRecursive( UNIDIFF_DATA_PATH );
   diff_available    = array_create_size( UniDiffData_t, array_size( diff_files ) );
   for (int i=0; i<array_size(diff_files); i++ ) {
      xmlDocPtr doc;
      xmlNodePtr node;
      UniDiffData_t *diff;
 
      /* Parse the header. */
      doc = xml_parsePhysFS( diff_files[i] );
      if (doc == NULL) {
         free( diff_files[i] );
         continue;
      }
 
      node = doc->xmlChildrenNode;
      if (!xml_isNode(node,"unidiff")) {
         WARN( _("Malformed XML header for '%s' UniDiff: missing root element '%s'"), diff_files[i], "unidiff" );
         xmlFreeDoc( doc );
         free( diff_files[i] );
         continue;
      }
 
      diff = &array_grow(&diff_available);
      diff->filename = diff_files[i];
      xmlr_attr_strd(node, "name", diff->name);
      xmlFreeDoc(doc);
   }
   array_free( diff_files );
   array_shrink(&diff_available);
 
   /* Sort and warn about duplicates. */
   qsort( diff_available, array_size(diff_available), sizeof(UniDiffData_t), diff_cmp );
   for (int i=0; i<array_size(diff_available)-1; i++) {
      UniDiffData_t *d = &diff_available[i];
      UniDiffData_t *dn = &diff_available[i+1];
      if (strcmp( d->name, dn->name )==0)
         WARN(_("Two unidiff have the same name '%s'!"), d->name );
   }
 
   if (conf.devmode) {
      time = SDL_GetTicks() - time;
      DEBUG( n_("Loaded %d UniDiff in %.3f s", "Loaded %d UniDiffs in %.3f s", array_size(diff_available) ), array_size(diff_available), time/1000. );
   }
   else
      DEBUG( n_("Loaded %d UniDiff", "Loaded %d UniDiffs", array_size(diff_available) ), array_size(diff_available) );
 
   return 0;
}
 
int diff_isApplied( const char *name )
{
   if (diff_get(name) != NULL)
      return 1;
   return 0;
}
 
static UniDiff_t* diff_get( const char *name )
{
   for (int i=0; i<array_size(diff_stack); i++)
      if (strcmp(diff_stack[i].name,name)==0)
         return &diff_stack[i];
   return NULL;
}
 
int diff_apply( const char *name )
{
   return diff_applyInternal( name, 1 );
}
 
static int diff_applyInternal( const char *name, int oneshot )
{
   xmlNodePtr node;
   xmlDocPtr doc;
   UniDiffData_t *d;
 
   /* Check if already applied. */
   if (diff_isApplied(name))
      return 0;
 
   /* Reset change variable. */
   if (oneshot && !diff_universe_defer)
      diff_universe_changed = 0;
 
   const UniDiffData_t q = { .name = (char*)name };
   d = bsearch( &q, diff_available, array_size(diff_available), sizeof(UniDiffData_t), diff_cmp );
   if (d == NULL) {
      WARN(_("UniDiff '%s' not found in %s!"), name, UNIDIFF_DATA_PATH);
      return -1;
   }
 
   doc = xml_parsePhysFS( d->filename );
 
   node = doc->xmlChildrenNode;
   if (strcmp((char*)node->name,"unidiff")) {
      ERR(_("Malformed unidiff file: missing root element 'unidiff'"));
      return 0;
   }
 
   /* Apply it. */
   diff_patch( node );
 
   xmlFreeDoc(doc);
 
   /* Update universe. */
   if (oneshot)
      diff_checkUpdateUniverse();
 
   return 0;
}
 
static int diff_patchSystem( UniDiff_t *diff, xmlNodePtr node )
{
   UniHunk_t base, hunk;
   xmlNodePtr cur;
   char *buf;
 
   /* Set the target. */
   memset(&base, 0, sizeof(UniHunk_t));
   base.target.type = HUNK_TARGET_SYSTEM;
   xmlr_attr_strd(node,"name",base.target.u.name);
   if (base.target.u.name==NULL) {
      WARN(_("Unidiff '%s' has a system node without a 'name' tag, not applying."), diff->name);
      return -1;
   }
 
   /* Now parse the possible changes. */
   cur = node->xmlChildrenNode;
   do {
      xml_onlyNodes(cur);
      if (xml_isNode(cur,"spob")) {
         buf = xml_get( cur );
         if ( buf == NULL ) {
            WARN( _( "Unidiff '%s': Null hunk type." ), diff->name );
            continue;
         }
 
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Get the spob to modify. */
         xmlr_attr_strd(cur,"name",hunk.u.name);
 
         /* Get the type. */
         if (strcmp(buf,"add")==0)
            hunk.type = HUNK_TYPE_SPOB_ADD;
         else if (strcmp(buf,"remove")==0)
            hunk.type = HUNK_TYPE_SPOB_REMOVE;
         else
            WARN(_("Unidiff '%s': Unknown hunk type '%s' for spob '%s'."), diff->name, buf, hunk.u.name);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"spob_virtual")) {
         buf = xml_get( cur );
         if ( buf == NULL ) {
            WARN( _( "Unidiff '%s': Null hunk type." ), diff->name );
            continue;
         }
 
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Get the spob to modify. */
         xmlr_attr_strd(cur,"name",hunk.u.name);
 
         /* Get the type. */
         if (strcmp(buf,"add")==0)
            hunk.type = HUNK_TYPE_VSPOB_ADD;
         else if (strcmp(buf,"remove")==0)
            hunk.type = HUNK_TYPE_VSPOB_REMOVE;
         else
            WARN(_("Unidiff '%s': Unknown hunk type '%s' for virtual spob '%s'."), diff->name, buf, hunk.u.name);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"jump")) {
         buf = xml_get( cur );
         if (buf == NULL) {
            WARN( _( "Unidiff '%s': Null hunk type." ), diff->name );
            continue;
         }
 
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Get the jump point to modify. */
         xmlr_attr_strd(cur,"target",hunk.u.name);
 
         /* Get the type. */
         if (strcmp(buf,"add")==0)
            hunk.type = HUNK_TYPE_JUMP_ADD;
         else if (strcmp(buf,"remove")==0)
            hunk.type = HUNK_TYPE_JUMP_REMOVE;
         else
            WARN(_("Unidiff '%s': Unknown hunk type '%s' for jump '%s'."), diff->name, buf, hunk.u.name);
 
         hunk.node = cur;
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"background")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SSYS_BACKGROUND;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"features")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SSYS_FEATURES;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      WARN(_("Unidiff '%s' has unknown node '%s'."), diff->name, node->name);
   } while (xml_nextNode(cur));
 
   /* Clean up some stuff. */
   free(base.target.u.name);
   base.target.u.name = NULL;
 
   return 0;
}
 
static int diff_patchTech( UniDiff_t *diff, xmlNodePtr node )
{
   UniHunk_t base, hunk;
   xmlNodePtr cur;
 
   /* Set the target. */
   memset(&base, 0, sizeof(UniHunk_t));
   base.target.type = HUNK_TARGET_TECH;
   xmlr_attr_strd(node,"name",base.target.u.name);
   if (base.target.u.name==NULL) {
      WARN(_("Unidiff '%s' has an target node without a 'name' tag"), diff->name);
      return -1;
   }
 
   /* Now parse the possible changes. */
   cur = node->xmlChildrenNode;
   do {
      xml_onlyNodes(cur);
      if (xml_isNode(cur,"add")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Outfit type is constant. */
         hunk.type = HUNK_TYPE_TECH_ADD;
 
         /* Get the data. */
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"remove")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Outfit type is constant. */
         hunk.type = HUNK_TYPE_TECH_REMOVE;
 
         /* Get the data. */
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      WARN(_("Unidiff '%s' has unknown node '%s'."), diff->name, node->name);
   } while (xml_nextNode(cur));
 
   /* Clean up some stuff. */
   free(base.target.u.name);
   base.target.u.name = NULL;
 
   return 0;
}
 
static int diff_patchSpob( UniDiff_t *diff, xmlNodePtr node )
{
   UniHunk_t base, hunk;
   xmlNodePtr cur;
 
   /* Set the target. */
   memset(&base, 0, sizeof(UniHunk_t));
   base.target.type = HUNK_TARGET_SPOB;
   xmlr_attr_strd(node,"name",base.target.u.name);
   if (base.target.u.name==NULL) {
      WARN(_("Unidiff '%s' has an target node without a 'name' tag"), diff->name);
      return -1;
   }
 
   /* Now parse the possible changes. */
   cur = node->xmlChildrenNode;
   do {
      xml_onlyNodes(cur);
      if (xml_isNode(cur,"faction")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_FACTION;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"population")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_POPULATION;
         hunk.u.data = xml_getUInt(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"displayname")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_DISPLAYNAME;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"description")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_DESCRIPTION;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"bar")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_BAR;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"service_add")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_SERVICE_ADD;
         hunk.u.data = spob_getService( xml_get(cur) );
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"service_remove")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_SERVICE_REMOVE;
         hunk.u.data = spob_getService( xml_get(cur) );
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"tech_add")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_TECH_ADD;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"tech_remove")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_TECH_REMOVE;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"tag_add")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_TAG_ADD;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"tag_remove")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_TAG_REMOVE;
         hunk.u.name = xml_getStrd(cur);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"gfx_space")) {
         char str[PATH_MAX];
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_SPACE;
         snprintf( str, sizeof(str), SPOB_GFX_SPACE_PATH"%s", xml_get(cur));
         hunk.u.name = strdup(str);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"gfx_exterior")) {
         char str[PATH_MAX];
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_EXTERIOR;
         snprintf( str, sizeof(str), SPOB_GFX_EXTERIOR_PATH"%s", xml_get(cur));
         hunk.u.name = strdup(str);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"lua")) {
         char *str;
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
         hunk.type = HUNK_TYPE_SPOB_LUA;
         str = xml_get(cur);
         if (str != NULL)
            hunk.u.name = strdup( str );
         else
            hunk.u.name = NULL;
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      WARN(_("Unidiff '%s' has unknown node '%s'."), diff->name, cur->name);
   } while (xml_nextNode(cur));
 
   /* Clean up some stuff. */
   free(base.target.u.name);
   base.target.u.name = NULL;
 
   return 0;
}
 
static int diff_patchFaction( UniDiff_t *diff, xmlNodePtr node )
{
   UniHunk_t base, hunk;
   xmlNodePtr cur;
   char *buf;
 
   /* Set the target. */
   memset(&base, 0, sizeof(UniHunk_t));
   base.target.type = HUNK_TARGET_FACTION;
   xmlr_attr_strd(node,"name",base.target.u.name);
   if (base.target.u.name==NULL) {
      WARN(_("Unidiff '%s' has an target node without a 'name' tag"), diff->name);
      return -1;
   }
 
   /* Now parse the possible changes. */
   cur = node->xmlChildrenNode;
   do {
      xml_onlyNodes(cur);
      if (xml_isNode(cur,"visible")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Faction type is constant. */
         hunk.type = HUNK_TYPE_FACTION_VISIBLE;
 
         /* There is no name. */
         hunk.u.name = NULL;
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"invisible")) {
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Faction type is constant. */
         hunk.type = HUNK_TYPE_FACTION_INVISIBLE;
 
         /* There is no name. */
         hunk.u.name = NULL;
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      else if (xml_isNode(cur,"faction")) {
         buf = xml_get( cur );
         if ( buf == NULL ) {
            WARN( _( "Unidiff '%s': Null hunk type." ), diff->name );
            continue;
         }
 
         hunk.target.type = base.target.type;
         hunk.target.u.name = strdup(base.target.u.name);
 
         /* Get the faction to set the association of. */
         xmlr_attr_strd(cur,"name",hunk.u.name);
 
         /* Get the type. */
         if (strcmp(buf,"ally")==0)
            hunk.type = HUNK_TYPE_FACTION_ALLY;
         else if (strcmp(buf,"enemy")==0)
            hunk.type = HUNK_TYPE_FACTION_ENEMY;
         else if (strcmp(buf,"neutral")==0)
            hunk.type = HUNK_TYPE_FACTION_NEUTRAL;
         else
            WARN(_("Unidiff '%s': Unknown hunk type '%s' for faction '%s'."), diff->name, buf, hunk.u.name);
 
         /* Apply diff. */
         if (diff_patchHunk( &hunk ) < 0)
            diff_hunkFailed( diff, &hunk );
         else
            diff_hunkSuccess( diff, &hunk );
         continue;
      }
      WARN(_("Unidiff '%s' has unknown node '%s'."), diff->name, node->name);
   } while (xml_nextNode(cur));
 
   /* Clean up some stuff. */
   free(base.target.u.name);
   base.target.u.name = NULL;
 
   return 0;
}
 
static int diff_patch( xmlNodePtr parent )
{
   UniDiff_t *diff;
   xmlNodePtr node;
   int nfailed;
 
   /* Prepare it. */
   diff = diff_newDiff();
   memset(diff, 0, sizeof(UniDiff_t));
   xmlr_attr_strd(parent,"name",diff->name);
 
   node = parent->xmlChildrenNode;
   do {
      xml_onlyNodes(node);
      if (xml_isNode(node,"system")) {
         diff_universe_changed = 1;
         diff_patchSystem( diff, node );
      }
      else if (xml_isNode(node, "tech"))
         diff_patchTech( diff, node );
      else if (xml_isNode(node, "spob")) {
         diff_universe_changed = 1;
         diff_patchSpob( diff, node );
      }
      else if (xml_isNode(node, "faction")) {
         diff_universe_changed = 1;
         diff_patchFaction( diff, node );
      }
      else
         WARN(_("Unidiff '%s' has unknown node '%s'."), diff->name, node->name);
   } while (xml_nextNode(node));
 
   nfailed = array_size(diff->failed);
   if (nfailed > 0) {
      WARN(
         n_( "Unidiff '%s' failed to apply %d hunk.", "Unidiff '%s' failed to apply %d hunks.", nfailed ),
         diff->name, nfailed );
      for (int i=0; i<nfailed; i++) {
         UniHunk_t *fail = &diff->failed[i];
         char *target = fail->target.u.name;
         switch (fail->type) {
            case HUNK_TYPE_SPOB_ADD:
               WARN(_("   [%s] spob add: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_SPOB_REMOVE:
               WARN(_("   [%s] spob remove: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_VSPOB_ADD:
               WARN(_("   [%s] virtual spob add: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_VSPOB_REMOVE:
               WARN(_("   [%s] virtual spob remove: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_JUMP_ADD:
               WARN(_("   [%s] jump add: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_JUMP_REMOVE:
               WARN(_("   [%s] jump remove: '%s'"), target, fail->u.name);
               break;
            case HUNK_TYPE_TECH_ADD:
               WARN(_("   [%s] tech add: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_TECH_REMOVE:
               WARN(_("   [%s] tech remove: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_FACTION:
               WARN(_("   [%s] spob faction: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_FACTION_REMOVE:
               WARN(_("   [%s] spob faction removal: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_POPULATION:
               WARN(_("   [%s] spob population: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_POPULATION_REMOVE:
               WARN(_("   [%s] spob population removal: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_DISPLAYNAME:
               WARN(_("   [%s] spob displayname: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_DISPLAYNAME_REVERT:
               WARN(_("   [%s] spob displayname revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_DESCRIPTION:
               WARN(_("   [%s] spob description: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_DESCRIPTION_REVERT:
               WARN(_("   [%s] spob description revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_BAR:
               WARN(_("   [%s] spob bar: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_BAR_REVERT:
               WARN(_("   [%s] spob bar revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_SPACE:
               WARN(_("   [%s] spob space: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_SPACE_REVERT:
               WARN(_("   [%s] spob space revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_EXTERIOR:
               WARN(_("   [%s] spob exterior: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_EXTERIOR_REVERT:
               WARN(_("   [%s] spob exterior revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_LUA:
               WARN(_("   [%s] spob lua: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_LUA_REVERT:
               WARN(_("   [%s] spob lua revert: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_SPOB_SERVICE_ADD:
               WARN(_("   [%s] spob service add: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_SPOB_SERVICE_REMOVE:
               WARN(_("   [%s] spob service remove: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_SPOB_TECH_ADD:
               WARN(_("   [%s] spob tech add: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_SPOB_TECH_REMOVE:
               WARN(_("   [%s] spob tech remove: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_SPOB_TAG_ADD:
               WARN(_("   [%s] spob tech add: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_SPOB_TAG_REMOVE:
               WARN(_("   [%s] spob tech remove: '%s'"), target,
                     spob_getServiceName(fail->u.data) );
               break;
            case HUNK_TYPE_FACTION_VISIBLE:
               WARN(_("   [%s] faction visible: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_FACTION_INVISIBLE:
               WARN(_("   [%s] faction invisible: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_FACTION_ALLY:
               WARN(_("   [%s] faction set ally: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_FACTION_ENEMY:
               WARN(_("   [%s] faction set enemy: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_FACTION_NEUTRAL:
               WARN(_("   [%s] faction set neutral: '%s'"), target,
                     fail->u.name );
               break;
            case HUNK_TYPE_FACTION_REALIGN:
               WARN(_("   [%s] faction alignment reset: '%s'"), target,
                     fail->u.name );
               break;
 
            default:
               WARN(_("   unknown hunk '%d'"), fail->type);
               break;
         }
      }
   }
 
   /* Update overlay map just in case. */
   ovr_refresh();
   return 0;
}
 
static int diff_patchHunk( UniHunk_t *hunk )
{
   Spob *p;
   StarSystem *ssys;
   int a, b;
 
   switch (hunk->type) {
 
      /* Adding an spob. */
      case HUNK_TYPE_SPOB_ADD:
         spob_luaInit( spob_get(hunk->u.name) );
         diff_universe_changed = 1;
         return system_addSpob( system_get(hunk->target.u.name), hunk->u.name );
      /* Removing an spob. */
      case HUNK_TYPE_SPOB_REMOVE:
         diff_universe_changed = 1;
         return system_rmSpob( system_get(hunk->target.u.name), hunk->u.name );
 
      /* Adding an spob. */
      case HUNK_TYPE_VSPOB_ADD:
         diff_universe_changed = 1;
         return system_addVirtualSpob( system_get(hunk->target.u.name), hunk->u.name );
      /* Removing an spob. */
      case HUNK_TYPE_VSPOB_REMOVE:
         diff_universe_changed = 1;
         return system_rmVirtualSpob( system_get(hunk->target.u.name), hunk->u.name );
 
      /* Adding a Jump. */
      case HUNK_TYPE_JUMP_ADD:
         diff_universe_changed = 1;
         return system_addJumpDiff( system_get(hunk->target.u.name), hunk->node );
      /* Removing a jump. */
      case HUNK_TYPE_JUMP_REMOVE:
         diff_universe_changed = 1;
         return system_rmJump( system_get(hunk->target.u.name), hunk->u.name );
 
      /* Changing system background. */
      case HUNK_TYPE_SSYS_BACKGROUND:
         ssys = system_get(hunk->target.u.name);
         hunk->o.name = ssys->background;
         ssys->background = hunk->u.name;
         return 0;
      case HUNK_TYPE_SSYS_BACKGROUND_REVERT:
         ssys = system_get(hunk->target.u.name);
         ssys->background = (char*)hunk->o.name;
         return 0;
 
      /* Changing system features designation. */
      case HUNK_TYPE_SSYS_FEATURES:
         ssys = system_get(hunk->target.u.name);
         hunk->o.name = ssys->features;
         ssys->features = hunk->u.name;
         return 0;
      case HUNK_TYPE_SSYS_FEATURES_REVERT:
         ssys = system_get(hunk->target.u.name);
         ssys->features = (char*)hunk->o.name;
         return 0;
 
      /* Adding a tech. */
      case HUNK_TYPE_TECH_ADD:
         return tech_addItem( hunk->target.u.name, hunk->u.name );
      /* Removing a tech. */
      case HUNK_TYPE_TECH_REMOVE:
         return tech_rmItem( hunk->target.u.name, hunk->u.name );
 
      /* Changing spob faction. */
      case HUNK_TYPE_SPOB_FACTION:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         if (p->presence.faction<0)
            hunk->o.name = NULL;
         else
            hunk->o.name = faction_name( p->presence.faction );
         diff_universe_changed = 1;
         return spob_setFaction( p, faction_get(hunk->u.name) );
      case HUNK_TYPE_SPOB_FACTION_REMOVE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         diff_universe_changed = 1;
         if (hunk->o.name==NULL)
            return spob_setFaction( p, -1 );
         else
            return spob_setFaction( p, faction_get(hunk->o.name) );
 
      /* Changing spob population. */
      case HUNK_TYPE_SPOB_POPULATION:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.data = p->population;
         p->population = hunk->u.data;
         return 0;
      case HUNK_TYPE_SPOB_POPULATION_REMOVE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->population = hunk->o.data;
         return 0;
 
      /* Changing spob displayname. */
      case HUNK_TYPE_SPOB_DISPLAYNAME:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->display;
         p->display = hunk->u.name;
         return 0;
      case HUNK_TYPE_SPOB_DISPLAYNAME_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->display = (char*)hunk->o.name;
         return 0;
 
      /* Changing spob description. */
      case HUNK_TYPE_SPOB_DESCRIPTION:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->description;
         p->description = hunk->u.name;
         return 0;
      case HUNK_TYPE_SPOB_DESCRIPTION_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->description = (char*)hunk->o.name;
         return 0;
 
      /* Changing spob bar description. */
      case HUNK_TYPE_SPOB_BAR:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->bar_description;
         p->bar_description = hunk->u.name;
         return 0;
      case HUNK_TYPE_SPOB_BAR_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->bar_description = (char*)hunk->o.name;
         return 0;
 
      /* Modifying spob services. */
      case HUNK_TYPE_SPOB_SERVICE_ADD:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         if (spob_hasService( p, hunk->u.data ))
            return -1;
         spob_addService( p, hunk->u.data );
         diff_universe_changed = 1;
         return 0;
      case HUNK_TYPE_SPOB_SERVICE_REMOVE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         if (!spob_hasService( p, hunk->u.data ))
            return -1;
         spob_rmService( p, hunk->u.data );
         diff_universe_changed = 1;
         return 0;
 
      /* Modifying tech stuff. */
      case HUNK_TYPE_SPOB_TECH_ADD:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         if (p->tech == NULL)
            p->tech = tech_groupCreate();
         tech_addItemTech( p->tech, hunk->u.name );
         return 0;
      case HUNK_TYPE_SPOB_TECH_REMOVE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         tech_rmItemTech( p->tech, hunk->u.name );
         return 0;
 
      /* Modifying tag stuff. */
      case HUNK_TYPE_SPOB_TAG_ADD:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         if (p->tech == NULL)
            p->tech = tech_groupCreate();
         if (p->tags==NULL)
            p->tags = array_create( char* );
         array_push_back( &p->tags, strdup( hunk->u.name ) );
         return 0;
      case HUNK_TYPE_SPOB_TAG_REMOVE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         a = -1;
         for (int i=0; i<array_size(p->tags); i++) {
            if (strcmp(p->tags[i], hunk->u.name )==0) {
               a = i;
               break;
            }
         }
         if (a<0)
            return -1; /* Didn't find tag! */
         free( p->tags[a] );
         array_erase( &p->tags, &p->tags[a], &p->tags[a+1] );
         return 0;
 
      /* Changing spob space graphics. */
      case HUNK_TYPE_SPOB_SPACE:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->gfx_spaceName;
         p->gfx_spaceName = hunk->u.name;
         diff_universe_changed = 1;
         return 0;
      case HUNK_TYPE_SPOB_SPACE_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->gfx_spaceName = (char*)hunk->o.name;
         diff_universe_changed = 1;
         return 0;
 
      /* Changing spob exterior graphics. */
      case HUNK_TYPE_SPOB_EXTERIOR:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->gfx_exterior;
         p->gfx_exterior = hunk->u.name;
         return 0;
      case HUNK_TYPE_SPOB_EXTERIOR_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->gfx_exterior = (char*)hunk->o.name;
         return 0;
 
      /* Change Lua stuff. */
      case HUNK_TYPE_SPOB_LUA:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         hunk->o.name = p->lua_file;
         p->lua_file = hunk->u.name;
         spob_luaInit( p );
         diff_universe_changed = 1;
         return 0;
      case HUNK_TYPE_SPOB_LUA_REVERT:
         p = spob_get( hunk->target.u.name );
         if (p==NULL)
            return -1;
         p->lua_file = (char*)hunk->o.name;
         spob_luaInit( p );
         diff_universe_changed = 1;
         return 0;
 
      /* Making a faction visible. */
      case HUNK_TYPE_FACTION_VISIBLE:
         return faction_setInvisible( faction_get(hunk->target.u.name), 0 );
      /* Making a faction invisible. */
      case HUNK_TYPE_FACTION_INVISIBLE:
         return faction_setInvisible( faction_get(hunk->target.u.name), 1 );
      /* Making two factions allies. */
      case HUNK_TYPE_FACTION_ALLY:
         a = faction_get( hunk->target.u.name );
         b = faction_get( hunk->u.name );
         if (areAllies(a, b))
            hunk->o.data = 'A';
         else if (areEnemies(a, b))
            hunk->o.data = 'E';
         else
            hunk->o.data = 0;
         faction_addAlly( a, b );
         faction_addAlly( b, a );
         return 0;
      /* Making two factions enemies. */
      case HUNK_TYPE_FACTION_ENEMY:
         a = faction_get( hunk->target.u.name );
         b = faction_get( hunk->u.name );
         if (areAllies(a, b))
            hunk->o.data = 'A';
         else if (areEnemies(a, b))
            hunk->o.data = 'E';
         else
            hunk->o.data = 0;
         faction_addEnemy( a, b );
         faction_addEnemy( b, a );
         return 0;
      /* Making two factions neutral (removing enemy/ally statuses). */
      case HUNK_TYPE_FACTION_NEUTRAL:
         a = faction_get( hunk->target.u.name );
         b = faction_get( hunk->u.name );
         if (areAllies(a, b))
            hunk->o.data = 'A';
         else if (areEnemies(a, b))
            hunk->o.data = 'E';
         else
            hunk->o.data = 0;
         faction_rmAlly( a, b );
         faction_rmAlly( b, a );
         faction_rmEnemy( a, b );
         faction_rmEnemy( b, a );
         return 0;
      /* Resetting the alignment state of two factions. */
      case HUNK_TYPE_FACTION_REALIGN:
         a = faction_get( hunk->target.u.name );
         b = faction_get( hunk->u.name );
         if (hunk->o.data == 'A') {
            faction_rmEnemy(a, b);
            faction_rmEnemy(b, a);
            faction_addAlly(a, b);
            faction_addAlly(b, a);
         }
         else if (hunk->o.data == 'E') {
            faction_rmAlly(a, b);
            faction_rmAlly(b, a);
            faction_addEnemy(a, b);
            faction_addAlly(b, a);
         }
         else {
            faction_rmAlly( a, b );
            faction_rmAlly( b, a );
            faction_rmEnemy( a, b );
            faction_rmEnemy( b, a );
         }
         return 0;
 
      default:
         WARN(_("Unknown hunk type '%d'."), hunk->type);
         break;
   }
 
   return -1;
}
 
static void diff_hunkFailed( UniDiff_t *diff, UniHunk_t *hunk )
{
   if (diff == NULL)
      return;
   if (diff->failed == NULL)
      diff->failed = array_create( UniHunk_t );
   array_grow( &diff->failed ) = *hunk;
}
 
static void diff_hunkSuccess( UniDiff_t *diff, UniHunk_t *hunk )
{
   if (diff == NULL)
      return;
   if (diff->applied == NULL)
      diff->applied = array_create( UniHunk_t );
   array_grow( &diff->applied ) = *hunk;
}
 
void diff_remove( const char *name )
{
   /* Check if already applied. */
   UniDiff_t *diff = diff_get(name);
   if (diff == NULL)
      return;
 
   diff_removeDiff(diff);
 
   diff_checkUpdateUniverse();
}
 
void diff_clear (void)
{
   while (array_size(diff_stack) > 0)
      diff_removeDiff(&diff_stack[array_size(diff_stack)-1]);
   array_free( diff_stack );
   diff_stack = NULL;
 
   diff_checkUpdateUniverse();
}
 
void diff_free (void)
{
   diff_clear();
   for (int i = 0; i < array_size(diff_available); i++) {
      UniDiffData_t *d = &diff_available[i];
      free( d->name );
      free( d->filename );
   }
   array_free(diff_available);
   diff_available = NULL;
}
 
static UniDiff_t *diff_newDiff (void)
{
   /* Check if needs initialization. */
   if (diff_stack == NULL)
      diff_stack = array_create( UniDiff_t );
   return &array_grow(&diff_stack);
}
 
static int diff_removeDiff( UniDiff_t *diff )
{
   for (int i=0; i<array_size(diff->applied); i++) {
      UniHunk_t hunk = diff->applied[i];
      /* Invert the type for reverting. */
      switch (hunk.type) {
         case HUNK_TYPE_SPOB_ADD:
            hunk.type = HUNK_TYPE_SPOB_REMOVE;
            break;
         case HUNK_TYPE_SPOB_REMOVE:
            hunk.type = HUNK_TYPE_SPOB_ADD;
            break;
 
         case HUNK_TYPE_VSPOB_ADD:
            hunk.type = HUNK_TYPE_VSPOB_REMOVE;
            break;
         case HUNK_TYPE_VSPOB_REMOVE:
            hunk.type = HUNK_TYPE_VSPOB_ADD;
            break;
 
         case HUNK_TYPE_JUMP_ADD:
            hunk.type = HUNK_TYPE_JUMP_REMOVE;
            break;
         case HUNK_TYPE_JUMP_REMOVE:
            hunk.type = HUNK_TYPE_JUMP_ADD;
            break;
 
         case HUNK_TYPE_SSYS_BACKGROUND:
            hunk.type = HUNK_TYPE_SSYS_BACKGROUND_REVERT;
            break;
         case HUNK_TYPE_SSYS_FEATURES:
            hunk.type = HUNK_TYPE_SSYS_FEATURES_REVERT;
            break;
 
         case HUNK_TYPE_TECH_ADD:
            hunk.type = HUNK_TYPE_TECH_REMOVE;
            break;
         case HUNK_TYPE_TECH_REMOVE:
            hunk.type = HUNK_TYPE_TECH_ADD;
            break;
 
         case HUNK_TYPE_SPOB_FACTION:
            hunk.type = HUNK_TYPE_SPOB_FACTION_REMOVE;
            break;
 
         case HUNK_TYPE_SPOB_POPULATION:
            hunk.type = HUNK_TYPE_SPOB_POPULATION_REMOVE;
            break;
 
         case HUNK_TYPE_SPOB_DISPLAYNAME:
            hunk.type = HUNK_TYPE_SPOB_DISPLAYNAME_REVERT;
            break;
 
         case HUNK_TYPE_SPOB_DESCRIPTION:
            hunk.type = HUNK_TYPE_SPOB_DESCRIPTION_REVERT;
            break;
 
         case HUNK_TYPE_SPOB_BAR:
            hunk.type = HUNK_TYPE_SPOB_BAR_REVERT;
            break;
 
         case HUNK_TYPE_SPOB_SERVICE_ADD:
            hunk.type = HUNK_TYPE_SPOB_SERVICE_REMOVE;
            break;
         case HUNK_TYPE_SPOB_SERVICE_REMOVE:
            hunk.type = HUNK_TYPE_SPOB_SERVICE_ADD;
            break;
 
         case HUNK_TYPE_SPOB_TECH_ADD:
            hunk.type = HUNK_TYPE_SPOB_TECH_REMOVE;
            break;
         case HUNK_TYPE_SPOB_TECH_REMOVE:
            hunk.type = HUNK_TYPE_SPOB_TECH_ADD;
            break;
 
         case HUNK_TYPE_SPOB_TAG_ADD:
            hunk.type = HUNK_TYPE_SPOB_TAG_REMOVE;
            break;
         case HUNK_TYPE_SPOB_TAG_REMOVE:
            hunk.type = HUNK_TYPE_SPOB_TAG_ADD;
            break;
 
         case HUNK_TYPE_SPOB_SPACE:
            hunk.type = HUNK_TYPE_SPOB_SPACE_REVERT;
            break;
 
         case HUNK_TYPE_SPOB_EXTERIOR:
            hunk.type = HUNK_TYPE_SPOB_EXTERIOR_REVERT;
            break;
 
         case HUNK_TYPE_SPOB_LUA:
            hunk.type = HUNK_TYPE_SPOB_LUA_REVERT;
            break;
 
         case HUNK_TYPE_FACTION_VISIBLE:
            hunk.type = HUNK_TYPE_FACTION_INVISIBLE;
            break;
         case HUNK_TYPE_FACTION_INVISIBLE:
            hunk.type = HUNK_TYPE_FACTION_VISIBLE;
            break;
 
         case HUNK_TYPE_FACTION_ALLY:
            hunk.type = HUNK_TYPE_FACTION_REALIGN;
            break;
         case HUNK_TYPE_FACTION_ENEMY:
            hunk.type = HUNK_TYPE_FACTION_REALIGN;
            break;
         case HUNK_TYPE_FACTION_NEUTRAL:
            hunk.type = HUNK_TYPE_FACTION_REALIGN;
            break;
 
         default:
            WARN(_("Unknown Hunk type '%d'."), hunk.type);
            continue;
      }
 
      if (diff_patchHunk(&hunk))
         WARN(_("Failed to remove hunk type '%d'."), hunk.type);
   }
 
   diff_cleanup(diff);
   array_erase( &diff_stack, diff, &diff[1] );
   return 0;
}
 
static void diff_cleanup( UniDiff_t *diff )
{
   free(diff->name);
   for (int i=0; i<array_size(diff->applied); i++)
      diff_cleanupHunk(&diff->applied[i]);
   array_free(diff->applied);
   for (int i=0; i<array_size(diff->failed); i++)
      diff_cleanupHunk(&diff->failed[i]);
   array_free(diff->failed);
   memset(diff, 0, sizeof(UniDiff_t));
}
 
static void diff_cleanupHunk( UniHunk_t *hunk )
{
   free(hunk->target.u.name);
   hunk->target.u.name = NULL;
 
   switch (hunk->type) { /* TODO: Does it really matter? */
      case HUNK_TYPE_SPOB_ADD:
      case HUNK_TYPE_SPOB_REMOVE:
      case HUNK_TYPE_VSPOB_ADD:
      case HUNK_TYPE_VSPOB_REMOVE:
      case HUNK_TYPE_JUMP_ADD:
      case HUNK_TYPE_JUMP_REMOVE:
      case HUNK_TYPE_SSYS_BACKGROUND:
      case HUNK_TYPE_SSYS_FEATURES:
      case HUNK_TYPE_TECH_ADD:
      case HUNK_TYPE_TECH_REMOVE:
      case HUNK_TYPE_SPOB_FACTION:
      case HUNK_TYPE_SPOB_FACTION_REMOVE:
      case HUNK_TYPE_SPOB_DISPLAYNAME:
      case HUNK_TYPE_SPOB_DISPLAYNAME_REVERT:
      case HUNK_TYPE_SPOB_DESCRIPTION:
      case HUNK_TYPE_SPOB_DESCRIPTION_REVERT:
      case HUNK_TYPE_SPOB_TECH_ADD:
      case HUNK_TYPE_SPOB_TECH_REMOVE:
      case HUNK_TYPE_SPOB_TAG_ADD:
      case HUNK_TYPE_SPOB_TAG_REMOVE:
      case HUNK_TYPE_SPOB_BAR:
      case HUNK_TYPE_SPOB_BAR_REVERT:
      case HUNK_TYPE_SPOB_SPACE:
      case HUNK_TYPE_SPOB_SPACE_REVERT:
      case HUNK_TYPE_SPOB_EXTERIOR:
      case HUNK_TYPE_SPOB_EXTERIOR_REVERT:
      case HUNK_TYPE_SPOB_LUA:
      case HUNK_TYPE_SPOB_LUA_REVERT:
      case HUNK_TYPE_FACTION_VISIBLE:
      case HUNK_TYPE_FACTION_INVISIBLE:
      case HUNK_TYPE_FACTION_ALLY:
      case HUNK_TYPE_FACTION_ENEMY:
      case HUNK_TYPE_FACTION_NEUTRAL:
      case HUNK_TYPE_FACTION_REALIGN:
         free(hunk->u.name);
         hunk->u.name = NULL;
         break;
 
      default:
         break;
   }
   memset( hunk, 0, sizeof(UniHunk_t) );
}
 
int diff_save( xmlTextWriterPtr writer )
{
   xmlw_startElem(writer,"diffs");
   if (diff_stack != NULL) {
      for (int i=0; i<array_size(diff_stack); i++) {
         UniDiff_t *diff = &diff_stack[i];
 
         xmlw_elem(writer, "diff", "%s", diff->name);
      }
   }
   xmlw_endElem(writer); /* "diffs" */
   return 0;
 
}
 
int diff_load( xmlNodePtr parent )
{
   xmlNodePtr node;
   int defer = diff_universe_defer;
 
   /* Don't update universe here. */
   diff_universe_defer = 1;
   diff_universe_changed = 0;
   diff_clear();
   diff_universe_defer = defer;
 
   node = parent->xmlChildrenNode;
   do {
      if (xml_isNode(node,"diffs")) {
         xmlNodePtr cur = node->xmlChildrenNode;
         do {
            if ( xml_isNode( cur, "diff" ) ) {
               char *diffName = xml_get( cur );
               if ( diffName == NULL ) {
                  WARN( _( "Expected node \"diff\" to contain the name of a unidiff. Was empty." ) );
                  continue;
               }
               diff_applyInternal( diffName, 0 );
            }
         } while (xml_nextNode(cur));
      }
   } while (xml_nextNode(node));
 
   /* Update as necessary. */
   diff_checkUpdateUniverse();
 
   return 0;
}
 
static int diff_checkUpdateUniverse (void)
{
   Pilot *const* pilots;
 
   if (!diff_universe_changed || diff_universe_defer)
      return 0;
 
   space_reconstructPresences();
   safelanes_recalculate();
 
   /* Re-compute the economy. */
   economy_execQueued();
   economy_initialiseCommodityPrices();
 
   /* Have to update planet graphics if necessary. */
   if (cur_system != NULL) {
      space_gfxUnload( cur_system );
      space_gfxLoad( cur_system );
   }
 
   /* Have to pilot targetting just in case. */
   pilots = pilot_getAll();
   for (int i=0; i<array_size(pilots); i++) {
      Pilot *p = pilots[i];
      p->nav_spob       = -1;
      p->nav_hyperspace = -1;
 
      /* Hack in case the pilot was actively jumping, this won't run the hook,
       * but I guess it's too much effort to properly fix for a situation that
       * will likely never happen. */
      if (!pilot_isWithPlayer(p) && pilot_isFlag( p, PILOT_HYPERSPACE ))
         pilot_delete(p);
      else
         pilot_rmFlag( p, PILOT_HYPERSPACE ); /* Corner case player, just have it not crash and randomly stop the jump. */
 
      /* Have to reset in the case of starting. */
      if (pilot_isFlag( p, PILOT_HYP_BEGIN ) ||
            pilot_isFlag( p, PILOT_HYP_BRAKE ) ||
            pilot_isFlag( p, PILOT_HYP_PREP ))
         pilot_hyperspaceAbort( p );
   }
 
   /* Player has to update the GUI so we send again. */
   player_targetSpobSet( -1 );
   player_targetHyperspaceSet( -1, 0 );
 
   diff_universe_changed = 0;
   return 1;
}
 
void unidiff_universeDefer( int enable )
{
   int defer = diff_universe_defer;
   diff_universe_defer = enable;
   if (defer && !enable)
      diff_checkUpdateUniverse();
}