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/*
* This file is part of libextractor.
* (C) 2008, 2009 Toni Ruottu
*
* libextractor is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 3, or (at your
* option) any later version.
*
* libextractor 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libextractor; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/**
* @file plugins/xm_extractor.c
* @brief plugin to support XM files
* @author Toni Ruottu
* @author Christian Grothoff
*/
#include "platform.h"
#include "extractor.h"
/**
* Header of an XM file.
*/
struct Header
{
char magicid[17];
char title[20];
char something[1];
char tracker[20];
char version[2];
};
/**
* Give meta data to LE.
*
* @param s utf-8 string meta data value
* @param t type of the meta data
*/
#define ADD(s,t) do { if (0 != ec->proc (ec->cls, "xm", t, EXTRACTOR_METAFORMAT_UTF8, "text/plain", s, strlen (s) + 1)) return; } while (0)
/**
* "extract" metadata from an Extended Module
*
* The XM module format description for XM files
* version $0104 that was written by Mr.H of Triton
* in 1994 was used, while this piece of software
* was originally written.
*
* @param ec extraction context
*/
void
EXTRACTOR_xm_extract_method (struct EXTRACTOR_ExtractContext *ec)
{
void *data;
const struct Header *head;
char title[21];
char tracker[21];
char xmversion[8];
size_t n;
if ((ssize_t) sizeof (struct Header) >
ec->read (ec->cls,
&data,
sizeof (struct Header)))
return;
head = data;
/* Check "magic" id bytes */
if (memcmp (head->magicid, "Extended Module: ", 17))
return;
ADD("audio/x-xm", EXTRACTOR_METATYPE_MIMETYPE);
/* Version of Tracker */
snprintf (xmversion,
sizeof (xmversion),
"%d.%d",
head->version[1],
head->version[0]);
ADD (xmversion, EXTRACTOR_METATYPE_FORMAT_VERSION);
/* Song title */
memcpy (&title, head->title, 20);
n = 19;
while ( (n > 0) && isspace ((unsigned char) title[n]))
n--;
title[n + 1] = '\0';
ADD (title, EXTRACTOR_METATYPE_TITLE);
/* software used for creating the data */
memcpy (&tracker, head->tracker, 20);
n = 19;
while ( (n > 0) && isspace ((unsigned char) tracker[n]))
n--;
tracker[n + 1] = '\0';
ADD (tracker, EXTRACTOR_METATYPE_CREATED_BY_SOFTWARE);
return;
}
/* end of xm_extractor.c */
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