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Member "libextractor-1.11/src/plugins/it_extractor.c" (30 Jan 2021, 3166 Bytes) of package /linux/privat/libextractor-1.11.tar.gz:


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    1 /*
    2  * This file is part of libextractor.
    3  * Copyright (C) 2008 Toni Ruottu
    4  *
    5  * libextractor is free software; you can redistribute it and/or modify
    6  * it under the terms of the GNU General Public License as published
    7  * by the Free Software Foundation; either version 3, or (at your
    8  * option) any later version.
    9  *
   10  * libextractor is distributed in the hope that it will be useful, but
   11  * WITHOUT ANY WARRANTY; without even the implied warranty of
   12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13  * General Public License for more details.
   14  *
   15  * You should have received a copy of the GNU General Public License
   16  * along with libextractor; see the file COPYING.  If not, write to the
   17  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   18  * Boston, MA 02110-1301, USA.
   19  *
   20  */
   21 /**
   22  * @file plugins/xm_extractor.c
   23  * @brief plugin to support Impulse Tracker (IT) files
   24  * @author Toni Ruottu
   25  * @author Christian Grothoff
   26  */
   27 #include "platform.h"
   28 #include "extractor.h"
   29 
   30 
   31 /**
   32  * Number of bytes in the full IT header and thus
   33  * the minimum size we're going to accept for an IT file.
   34  */
   35 #define HEADER_SIZE  0xD0
   36 
   37 
   38 /**
   39  * Header of an IT file.
   40  */
   41 struct Header
   42 {
   43   char magicid[4];
   44   char title[26];
   45   char hilight[2];
   46   char orders[2];
   47   char instruments[2];
   48   char samples[2];
   49   char patterns[2];
   50   char version[2];
   51   char compatible[2];
   52   char flags[2];
   53   char special[2];
   54 };
   55 
   56 
   57 /**
   58  * extract meta data from an Impulse Tracker module
   59  *
   60  * ITTECH.TXT as taken from IT 2.14p5 was used, while this piece of
   61  * software was originally written.
   62  *
   63  * @param ec extraction context
   64  */
   65 void
   66 EXTRACTOR_it_extract_method (struct EXTRACTOR_ExtractContext *ec)
   67 {
   68   void *data;
   69   char title[27];
   70   char itversion[8];
   71   const struct Header *head;
   72 
   73   if ((ssize_t) HEADER_SIZE >
   74       ec->read (ec->cls,
   75                 &data,
   76                 HEADER_SIZE))
   77     return;
   78   head = (struct Header *) data;
   79   /* Check "magic" id bytes */
   80   if (memcmp (head->magicid, "IMPM", 4))
   81     return;
   82   /* Mime-type */
   83   if (0 != ec->proc (ec->cls,
   84                      "it",
   85                      EXTRACTOR_METATYPE_MIMETYPE,
   86                      EXTRACTOR_METAFORMAT_UTF8,
   87                      "text/plain",
   88                      "audio/x-mod",
   89                      strlen ("audio/x-mod") + 1))
   90     return;
   91 
   92   /* Version of Tracker */
   93   snprintf (itversion,
   94             sizeof (itversion),
   95             "%d.%d",
   96             (head->version[0] & 0x01),
   97             head->version[1]);
   98   if (0 != ec->proc (ec->cls,
   99                      "it",
  100                      EXTRACTOR_METATYPE_FORMAT_VERSION,
  101                      EXTRACTOR_METAFORMAT_C_STRING,
  102                      "text/plain",
  103                      itversion,
  104                      strlen (itversion) + 1))
  105     return;
  106 
  107   /* Song title */
  108   memcpy (&title, head->title, 26);
  109   title[26] = '\0';
  110   if (0 != ec->proc (ec->cls,
  111                      "it",
  112                      EXTRACTOR_METATYPE_TITLE,
  113                      EXTRACTOR_METAFORMAT_C_STRING,
  114                      "text/plain",
  115                      title,
  116                      strlen (title) + 1))
  117     return;
  118 }
  119 
  120 
  121 /* end of it_extractor.c */