gecko-dev/media/webvtt/node.c

/**
 * Copyright (c) 2013 Mozilla Foundation and Contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *  - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 #include <string.h>
 #include <stdlib.h>
 #include "node_internal.h"
 
 static webvtt_node empty_node = {
  { 1 }, /* init ref count */
  0, /* parent */
  WEBVTT_EMPTY_NODE /* node kind */
};

WEBVTT_EXPORT void
webvtt_ref_node( webvtt_node *node )
{
  if( node ) {
    webvtt_ref( &node->refs );
  }
}

WEBVTT_EXPORT void 
webvtt_init_node( webvtt_node **node )
{
  if( *node != &empty_node ) {
    if( node && *node ) { 
      webvtt_release_node( node );
    }
    *node = &empty_node;
    webvtt_ref_node( *node );
  }
}

WEBVTT_INTERN webvtt_status
webvtt_create_node( webvtt_node **node, webvtt_node_kind kind, webvtt_node *parent )
{
  webvtt_node *temp_node;

  if( !node ) {
    return WEBVTT_INVALID_PARAM;
  }

  if( !( temp_node = (webvtt_node *)webvtt_alloc0(sizeof(*temp_node)) ) )
  {
    return WEBVTT_OUT_OF_MEMORY;
  }

  webvtt_ref_node( temp_node );
  temp_node->kind = kind;
  temp_node->parent = parent;
  *node = temp_node;

  return WEBVTT_SUCCESS;
}

WEBVTT_INTERN webvtt_status
webvtt_create_internal_node( webvtt_node **node, webvtt_node *parent, webvtt_node_kind kind, 
  webvtt_stringlist *css_classes, webvtt_string *annotation )
{
  webvtt_status status;
  webvtt_internal_node_data *node_data;

  if( WEBVTT_FAILED( status = webvtt_create_node( node, kind, parent ) ) ) {
    return status;
  }

  if ( !( node_data = (webvtt_internal_node_data *)webvtt_alloc0( sizeof(*node_data) ) ) )
  {
    return WEBVTT_OUT_OF_MEMORY;
  }

  webvtt_copy_stringlist( &node_data->css_classes, css_classes );
  webvtt_copy_string( &node_data->annotation, annotation );
  node_data->children = NULL;
  node_data->length = 0;
  node_data->alloc = 0;

  (*node)->data.internal_data = node_data;

  return WEBVTT_SUCCESS;
}

WEBVTT_INTERN webvtt_status
webvtt_create_head_node( webvtt_node **node )
{
  webvtt_status status;
  webvtt_string temp_annotation;

  webvtt_init_string( &temp_annotation );
  if( WEBVTT_FAILED( status = webvtt_create_internal_node( node, NULL, WEBVTT_HEAD_NODE, NULL, &temp_annotation ) ) ) {
    return status;
  }

  return WEBVTT_SUCCESS;
}

WEBVTT_INTERN webvtt_status
webvtt_create_timestamp_node( webvtt_node **node, webvtt_node *parent, webvtt_timestamp time_stamp )
{
  webvtt_status status;

  if( WEBVTT_FAILED( status = webvtt_create_node( node, WEBVTT_TIME_STAMP, parent ) ) ) {
    return status;
  }

  (*node)->data.timestamp = time_stamp;

  return WEBVTT_SUCCESS;
}

WEBVTT_INTERN webvtt_status
webvtt_create_text_node( webvtt_node **node, webvtt_node *parent, webvtt_string *text )
{
  webvtt_status status;

  if( WEBVTT_FAILED( status = webvtt_create_node( node, WEBVTT_TEXT, parent ) ) ) {
    return status;
  }

  webvtt_copy_string( &(*node)->data.text, text );

  return WEBVTT_SUCCESS;

}

WEBVTT_EXPORT void 
webvtt_release_node( webvtt_node **node )
{
  webvtt_uint i;
  webvtt_node *n;
  
  if( !node || !*node ) {
    return;
  }
  n = *node;

  if( webvtt_deref( &n->refs )  == 0 ) {
    if( n->kind == WEBVTT_TEXT ) {
        webvtt_release_string( &n->data.text );
    } else if( WEBVTT_IS_VALID_INTERNAL_NODE( n->kind ) && n->data.internal_data ) {
      webvtt_release_stringlist( &n->data.internal_data->css_classes );
      webvtt_release_string( &n->data.internal_data->annotation );
      for( i = 0; i < n->data.internal_data->length; i++ ) {
        webvtt_release_node( n->data.internal_data->children + i );
      }
      webvtt_free( n->data.internal_data->children );
      webvtt_free( n->data.internal_data );
    }
    webvtt_free( n );
  }
  *node = 0;
}

WEBVTT_INTERN webvtt_status
webvtt_attach_node( webvtt_node *parent, webvtt_node *to_attach )
{
  webvtt_node **next = 0;
  webvtt_internal_node_data *nd = 0;
  
  if( !parent || !to_attach || !parent->data.internal_data ) {
    return WEBVTT_INVALID_PARAM;
  }
  nd = parent->data.internal_data;
  
  if( nd->alloc == 0 ) {
    next = (webvtt_node **)webvtt_alloc0( sizeof( webvtt_node * ) * 8 );
    
    if( !next ) {
      return WEBVTT_OUT_OF_MEMORY;
    }
    
    nd->children = next;
    nd->alloc = 8;
  }
  
  if( nd->length + 1 >= ( nd->alloc / 3 ) * 2 ) {

    next = (webvtt_node **)webvtt_alloc0( sizeof( *next ) * nd->alloc * 2 );
    
    if( !next ) {
      return WEBVTT_OUT_OF_MEMORY;
    }

    nd->alloc *= 2;
    memcpy( next, nd->children, nd->length * sizeof( webvtt_node * ) );
    webvtt_free( nd->children );
    nd->children = next;
  }

  nd->children[ nd->length++ ] = to_attach;
  webvtt_ref_node( to_attach );

  return WEBVTT_SUCCESS;
}