mpv/playtree.c

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include "playtree.h"
#include "mp_msg.h"

static int
play_tree_is_valid(play_tree_t* pt);

play_tree_t*
play_tree_new(void) {
  play_tree_t* r = (play_tree_t*)calloc(1,sizeof(play_tree_t));
  if(r == NULL)
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",sizeof(play_tree_t));
  return r;
}

void
play_tree_free(play_tree_t* pt, int childs) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
#endif

  if(childs) {    
    for(iter = pt->child; iter != NULL; iter = iter->next)
      play_tree_free(iter,1);
    pt->child = NULL;
  }

  play_tree_remove(pt,0,0);

  for(iter = pt->child ; iter != NULL ; iter = iter->next)
    iter->parent = NULL;

  //if(pt->params) free(pt->params);
  if(pt->files) {
    int i;
    for(i = 0 ; pt->files[i] != NULL ; i++)
      free(pt->files[i]);
    free(pt->files);
  }

  free(pt);
}

void
play_tree_free_list(play_tree_t* pt, int childs) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
#endif

  for(iter = pt ; iter->prev != NULL ; iter = iter->prev)
    /* NOTHING */;

  for( ; iter != NULL ; iter = iter->next)
    play_tree_free(iter,childs);
    

}

void
play_tree_append_entry(play_tree_t* pt, play_tree_t* entry) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
  assert(entry != NULL);
#endif

  if(pt == entry)
    return;

  for(iter = pt ; iter->next != NULL ; iter = iter->next)
    /* NOTHING */;

  entry->parent = iter->parent;
  entry->prev = iter;
  entry->next = NULL;
  iter->next = entry;
}

void
play_tree_prepend_entry(play_tree_t* pt, play_tree_t* entry) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
  assert(entry != NULL);
#endif

  for(iter = pt ; iter->prev != NULL; iter = iter->prev)
    /* NOTHING */;

  entry->prev = NULL;
  entry->next = iter;
  entry->parent = iter->parent;

  iter->prev = entry;
  if(entry->parent) {
#ifdef DEBUG
    assert(entry->parent->child == iter);
#endif
    entry->parent->child = entry;
  }
}

void
play_tree_insert_entry(play_tree_t* pt, play_tree_t* entry) {
  
#ifdef DEBUG
  assert(pt != NULL);
  assert(entry != NULL);
#endif

  entry->parent = pt->parent;
  entry->prev = pt;
  if(pt->next) {
#ifdef DEBUG
    assert(pt->next->prev == pt);
#endif
    entry->next = pt->next;
    entry->next->prev = entry;
  } else 
    entry->next = NULL;
  pt->next = entry;

}
    
void
play_tree_remove(play_tree_t* pt, int free_it,int with_childs) {

#ifdef DEBUG
  assert(pt != NULL);
#endif

  // Middle of list
  if(pt->prev && pt->next) {
#ifdef DEBUG
    assert(pt->prev->next == pt);
    assert(pt->next->prev == pt);
#endif
    pt->prev->next = pt->next;
    pt->next->prev = pt->prev;
  } // End of list
  else if(pt->prev) { 
#ifdef DEBUG
    assert(pt->prev->next == pt);
#endif
    pt->prev->next = NULL;
  } // Begining of list
  else if(pt->next) {
#ifdef DEBUG
    assert(pt->next->prev == pt);
#endif
    pt->next->prev = NULL;
    if(pt->parent) {
#ifdef DEBUG
      assert(pt->parent->child == pt);
#endif
      pt->parent->child = pt->next;
    } 
  } // The only one
  else if(pt->parent) {
#ifdef DEBUG
    assert(pt->parent->child == pt);
#endif
    pt->parent->child = NULL;
  }

  pt->prev = pt->next = pt->parent = NULL;
  if(free_it)
    play_tree_free(pt,with_childs);

}

void
play_tree_set_child(play_tree_t* pt, play_tree_t* child) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
  assert(pt->files == NULL);
#endif

  for(iter = pt->child ; iter != NULL ; iter = iter->next)
    iter->parent = NULL;
  
  // Go back to first one
  for(iter = child ; iter->prev != NULL ; iter = iter->prev)
    /* NOTHING */;

  pt->child = iter;

  for( ; iter != NULL ; iter= iter->next)
    iter->parent = pt;

}

void
play_tree_set_parent(play_tree_t* pt, play_tree_t* parent) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
#endif

  if(pt->parent)
    pt->parent->child = NULL;

  for(iter = pt ; iter != NULL ; iter = iter->next)
    iter->parent = parent;

  if(pt->prev) {
    for(iter = pt->prev ; iter->prev != NULL ; iter = iter->prev)
      iter->parent = parent;
    iter->parent = parent;
    parent->child = iter;
  } else
    parent->child = pt;

}  
  

void
play_tree_add_file(play_tree_t* pt,char* file) {
  int n = 0;

#ifdef DEBUG
  assert(pt != NULL);
  assert(pt->child == NULL);
  assert(file != NULL);
#endif

  if(pt->files) {
    for(n = 0 ; pt->files[n] != NULL ; n++)
      /* NOTHING */;
  }
  pt->files = (char**)realloc(pt->files,(n+2)*sizeof(char*));
  if(pt->files ==NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*sizeof(char*));
    return;
  }

  pt->files[n] = strdup(file);
  pt->files[n+1] = NULL;

}

int
play_tree_remove_file(play_tree_t* pt,char* file) {
  int n,f = -1;

#ifdef DEBUG
  assert(pt != NULL);
  assert(file != NULL);
  assert(pt->files != NULL);
#endif

  for(n=0 ; pt->files[n] != NULL ; n++) {
    if(strcmp(file,pt->files[n]) == 0)
      f = n;
  }

  if(f < 0) // Not found
    return 0;

#ifdef DEBUG
  assert(n > f);
#endif

  free(pt->files[f]);

  if(n > 1) {
    memmove(&pt->files[f],&pt->files[f+1],(n-f)*sizeof(char*));
    pt->files = (char**)realloc(pt->files,n*sizeof(char*));
    if(pt->files == NULL) {
      mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*sizeof(char*));
      return -1;
    }
  } else {
    free(pt->files);
    pt->files = NULL;
  }

  return 1;
}

#if 0
void
play_tree_set_param(play_tree_t* pt, char* name, char* val) {
  int n = 0,ni = -1;

#ifdef DEBUG
  assert(pt != NULL);
  assert(name != NULL);
#endif

  if(pt->params) {
    for( ; pt->params[n].name != NULL ; n++) {
      if(strcasecmp(pt->params[n].name,name) == 0)
	ni = n;
    }
  }

  if(ni > 0) {
    if(pt->params[n].value != NULL) free(pt->params[n].value);
    pt->params[n].value = val;
    return;
  }

  pt->params = (play_tree_param_t*)realloc(pt->params,(n+2)*sizeof(play_tree_param_t));
  pt->params[n].name = strdup(name);
  pt->params[n].value = val != NULL ? strdup(val) : NULL;
  memset(&pt->params[n+1],0,sizeof(play_tree_param_t));

  return;
}

int
play_tree_unset_param(play_tree_t* pt, char* name) {
  int n,ni = 0;

#ifdef DEBUG
  assert(pt != NULL);
  assert(name != NULL);
  assert(pt->params != NULL);
#endif

  for(n = 0 ; pt->params[n].name != NULL ; n++) {
    if(strcasecmp(pt->params[n].name,name) == 0)
      ni = n;
  }

  if(ni < 0)
    return 0;

  if(n > 1) {
    memmove(&pt->params[ni],&pt->params[ni+1],(n-ni)*sizeof(play_tree_param_t));
    pt->params = (play_tree_param_t*)realloc(pt->params,n*sizeof(play_tree_param_t));
    assert(pt->params != NULL);
  } else {
    free(pt->params);
    pt->params = NULL;
  }

  return 1;
}

#endif

play_tree_iter_t*
play_tree_iter_new(play_tree_t* pt) {
  play_tree_iter_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
#endif
  
  if( ! play_tree_is_valid(pt))
    return NULL;

  iter = (play_tree_iter_t*)calloc(1,sizeof(play_tree_iter_t));
  if(! iter) return NULL;
  iter->root = pt;
  iter->tree = NULL;
 
  if(pt->parent)
    iter->loop = pt->parent->loop;

  return iter;
}

void
play_tree_iter_free(play_tree_iter_t* iter) {
  
#ifdef DEBUG
  assert(iter != NULL);
#endif

  if(iter->status_stack) {
#ifdef DEBUG
    assert(iter->stack_size > 0);
#endif
    free(iter->status_stack);
  }

  free(iter);
}

int
play_tree_iter_step(play_tree_iter_t* iter, int d,int with_nodes) {
  play_tree_t* pt;

#ifdef DEBUG
  assert(iter != NULL);
  assert(iter->root != NULL);
#endif

  if(iter->tree == NULL) {
    iter->tree = iter->root;
    return play_tree_iter_step(iter,0,with_nodes);
  }

  iter->file = 0;
  if( d > 0 )
    pt = iter->tree->next;
  else if(d < 0)
    pt = iter->tree->prev;
  else
    pt = iter->tree;

  if(pt == NULL) { // No next
    // Must we loop?
    if(iter->tree->parent && iter->tree->parent->loop != 0 && ((d > 0 && iter->loop != 0) || ( d < 0 && (iter->loop < 0 || iter->loop < iter->tree->parent->loop) ) ) ) { 
      if(d > 0) { // Go back to the first one
	for(pt = iter->tree ; pt->prev != NULL; pt = pt->prev)
	  /* NOTHNG */;
	if(iter->loop > 0) iter->loop--;
      } else if( d < 0 ) { // Or the last one
	for(pt = iter->tree ; pt->next != NULL; pt = pt->next)
	  /* NOTHNG */;
	if(iter->loop >= 0 && iter->loop < iter->tree->parent->loop) iter->loop++;
      }
      iter->tree = pt;
      return play_tree_iter_step(iter,0,with_nodes);
    }
    // Go up one level
    return play_tree_iter_up_step(iter,d,with_nodes);

  }

  // Is there any valid childs ?
  if(pt->child && play_tree_is_valid(pt->child)) {
    iter->tree = pt;
    if(with_nodes) { // Stop on the node      
      return PLAY_TREE_ITER_NODE;
    } else      // Or follow it
      return play_tree_iter_down_step(iter,d,with_nodes);
  }

  // Is it a valid enty ?
  if(! play_tree_is_valid(pt)) {
    if(d == 0) { // Can this happen ?
      mp_msg(MSGT_PLAYTREE,MSGL_ERR,"What to do now ???? Infinite loop if we continue\n");
      return PLAY_TREE_ITER_ERROR;
    } // Not a valid entry : go to next one
    return play_tree_iter_step(iter,d,with_nodes);
  }

#ifdef DEBUG
  assert(iter->tree->files != NULL);
#endif
  
  iter->tree = pt;
  for(d = 0 ; iter->tree->files[d] != NULL ; d++)
    /* NOTHING */;
  iter->num_files = d;

  return PLAY_TREE_ITER_ENTRY;

}

static int
play_tree_is_valid(play_tree_t* pt) {
  play_tree_t* iter;

#ifdef DEBUG
  assert(pt != NULL);
#endif

  if(pt->files != NULL)
    return 1;
  else if (pt->child != NULL) {
    for(iter = pt->child ; iter != NULL ; iter = iter->next) {
      if(play_tree_is_valid(iter))
	return 1;
    }
  }
  return 0;
}

int
play_tree_iter_up_step(play_tree_iter_t* iter, int d,int with_nodes) {

#ifdef DEBUG
  assert(iter != NULL);
  assert(iter->tree != NULL);
#endif
  
  iter->file = 0;
  if(iter->tree->parent == iter->root->parent)
    return PLAY_TREE_ITER_END;

#ifdef DEBUG
  assert(iter->tree->parent != NULL);
  assert(iter->stack_size > 0);
  assert(iter->status_stack != NULL);
#endif
  
  // Pop status
  iter->stack_size--;
  iter->loop = iter->status_stack[iter->stack_size];
  iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
  if(iter->stack_size > 0 && iter->status_stack == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*sizeof(char*));
    return PLAY_TREE_ITER_ERROR;
  }
  iter->tree = iter->tree->parent;
  return play_tree_iter_step(iter,d,with_nodes);
}
  
int
play_tree_iter_down_step(play_tree_iter_t* iter, int d,int with_nodes) {

#ifdef DEBUG
  assert(iter->tree->files == NULL);
  assert(iter->tree->child != NULL);
  assert(iter->tree->child->parent == iter->tree);
#endif

  iter->file = 0;
  //  Push status
  iter->stack_size++;
  iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
  if(iter->status_stack == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*sizeof(int));
    return PLAY_TREE_ITER_ERROR;
  }
  iter->status_stack[iter->stack_size-1] = iter->loop;
  // Set new status
  iter->loop = iter->tree->loop-1;
  if(d >= 0)
    iter->tree = iter->tree->child;
  else {
    play_tree_t* pt;
    for(pt = iter->tree->child ; pt->next != NULL ; pt = pt->next)
      /*NOTING*/;
    iter->tree = pt;
  }
  return play_tree_iter_step(iter,0,with_nodes);
}

char*
play_tree_iter_get_file(play_tree_iter_t* iter, int d) {
  
#ifdef DEBUG
  assert(iter != NULL);
  assert(iter->tree->child == NULL);
#endif

  if(iter->tree->files == NULL)
    return NULL;

  if(d > 0) {
    if(iter->tree->files[iter->file] == NULL)
      return NULL;
    iter->file++;
  } else if(d < 0) {
    if(iter->file == 0)
      return NULL;
    iter->file--;
  } 
  return iter->tree->files[iter->file-1];
}

play_tree_t*
play_tree_cleanup(play_tree_t* pt) {
  play_tree_t* iter, *tmp, *first;

#ifdef DEBUG
  assert(pt != NULL);
#endif

  if( ! play_tree_is_valid(pt)) {
    play_tree_remove(pt,1,1);
    return NULL;
  }

  first = pt->child;

  for(iter = pt->child ; iter != NULL ; ) {
    tmp = iter;
    iter = iter->next;
    if(! play_tree_is_valid(tmp)) {
      play_tree_remove(tmp,1,1);
      if(tmp == first) first = iter;
    }
  }

  for(iter = first ; iter != NULL ; ) {
    tmp = iter;
    iter = iter->next;
    play_tree_cleanup(tmp);
  }
    
  return pt;

}

play_tree_iter_t*
play_tree_iter_new_copy(play_tree_iter_t* old) {
  play_tree_iter_t* iter;

#ifdef DEBUG
  assert(old != NULL);
#endif

  iter = (play_tree_iter_t*)malloc(sizeof(play_tree_iter_t));
  if(iter == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",sizeof(play_tree_iter_t));
    return NULL;
  }
;
  memcpy(iter,old,sizeof(play_tree_iter_t));
  if(old->status_stack) {
    iter->status_stack = (int*)malloc(old->stack_size * sizeof(int));
    if(iter->status_stack == NULL) {
      mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",old->stack_size * sizeof(int));
      free(iter);
      return NULL;
    }
    memcpy(iter->status_stack,old->status_stack,iter->stack_size*sizeof(int));
  }
  return iter;
}