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libisofs/libisofs/filter.c

49 lines
1.1 KiB

/*
* Copyright (c) 2008 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 "filter.h"
#include "node.h"
void iso_filter_ref(FilterContext *filter)
{
++filter->refcount;
}
void iso_filter_unref(FilterContext *filter)
{
if (--filter->refcount == 0) {
filter->free(filter);
free(filter);
}
}
int iso_file_add_filter(IsoFile *file, FilterContext *filter, int flag)
{
int ret;
IsoStream *original, *filtered;
if (file == NULL || filter == NULL) {
return ISO_NULL_POINTER;
}
original = file->stream;
if (!iso_stream_is_repeatable(original)) {
/* TODO use custom error */
return ISO_WRONG_ARG_VALUE;
}
ret = filter->get_filter(filter, original, &filtered);
if (ret < 0) {
return ret;
}
iso_stream_unref(original);
file->stream = filtered;
return ISO_SUCCESS;
}