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libisofs/src/image.c

86 lines
2.1 KiB

/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#include "libisofs.h"
#include "image.h"
#include "error.h"
#include "node.h"
#include <stdlib.h>
#include <string.h>
/**
* Create a new image, empty.
*
* The image will be owned by you and should be unref() when no more needed.
*
* @param name
* Name of the image. This will be used as volset_id and volume_id.
* @param image
* Location where the image pointer will be stored.
* @return
* 1 sucess, < 0 error
*/
int iso_image_new(const char *name, IsoImage **image)
{
int res;
IsoImage *img;
if (image == NULL) {
return ISO_NULL_POINTER;
}
img = calloc(1, sizeof(IsoImage));
if (img == NULL) {
return ISO_MEM_ERROR;
}
/* fill image fields */
res = iso_node_new_root(&img->root);
if (res < 0) {
free(img);
return res;
}
img->refcount = 1;
if (name != NULL) {
img->volset_id = strdup(name);
img->volume_id = strdup(name);
}
*image = img;
return ISO_SUCCESS;
}
/**
* Increments the reference counting of the given image.
*/
void iso_image_ref(IsoImage *image)
{
++image->refcount;
}
/**
* Decrements the reference couting of the given image.
* If it reaches 0, the image is free, together with its tree nodes (whether
* their refcount reach 0 too, of course).
*/
void iso_image_unref(IsoImage *image)
{
if (--image->refcount == 0) {
/* we need to free the image */
iso_node_unref((IsoNode*)image->root);
free(image->volset_id);
free(image->volume_id);
free(image->publisher_id);
free(image->data_preparer_id);
free(image->system_id);
free(image->application_id);
free(image->copyright_file_id);
free(image->abstract_file_id);
free(image->biblio_file_id);
}
}