identify.c

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/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2025 Natalia Portillo.
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 
#include <errno.h>
#include <stdio.h>
 
#include <aaruformat.h>

AARU_EXPORT int AARU_CALL aaruf_identify(const char *filename)
{
    if(filename == NULL) return EINVAL;
 
    FILE *stream = NULL;
 
    stream = fopen(filename, "rb");
 
    if(stream == NULL) return errno;
 
    const int ret = aaruf_identify_stream(stream);
 
    fclose(stream);
 
    return ret;
}

AARU_EXPORT int AARU_CALL aaruf_identify_stream(FILE *image_stream)
{
    if(image_stream == NULL) return 0;
 
    if(fseek(image_stream, 0, SEEK_SET) != 0) return 0;
 
    AaruHeader header;
 
    const size_t ret = fread(&header, sizeof(AaruHeader), 1, image_stream);
 
    if(ret != 1) return 0;
 
    if((header.identifier == DIC_MAGIC || header.identifier == AARU_MAGIC) && header.imageMajorVersion <= AARUF_VERSION)
        return 100;
 
    return 0;
}