mod/it_loader.c

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4
   5 uint16_t short_byteswap(uint16_t in) {
   6         in = (((in >> 8) & 0xff) | ((in << 8) & 0xff));
   7         /*char tmp;
   8         tmp = in[2];
   9         in[2] = in[1];
  10         in[1] = tmp;
  11         */
  12         return in;
  13
  14 }
  15
  16 struct it_header {
  17         char sig[4];
  18         char songname[26];
  19         //0x20
  20         uint16_t ord_num;
  21         uint16_t ins_num;
  22         uint16_t smp_num;
  23         uint16_t pat_num;
  24         uint16_t cwt;
  25         uint16_t cmwt;
  26         uint16_t flags;
  27         uint16_t special;
  28         //0x30
  29         uint8_t gv; //global volume
  30         uint8_t mv; //mix volume
  31         uint8_t is; //initial speed
  32         uint8_t it; //initial tempo
  33         uint8_t sep; //panning separation between channels
  34         uint8_t pwd; //pitch wheel depth for midi controllers
  35         uint16_t msg_length; //length of song message
  36         uint32_t msg_offset; //message offset
  37         uint32_t reserved; //???
  38         //0x40
  39         uint8_t chnl_pan[64];
  40         //0x80
  41         uint8_t chnl_vol[64];
  42         //0xc0
  43         uint8_t *orders; //orders, in order ;). length is it_header.ord_num
  44 };
  45
  46 int main(int argc, char **argv){
  47         FILE *file;
  48         struct it_header it_header;
  49
  50         if(argc < 2){
  51                 printf("usage: slurp <.it file>");
  52                 return 1;
  53         }
  54
  55         file = fopen(argv[1], "rb");
  56
  57         if(!file){
  58                 printf("couldnt open file!\n");
  59                 return 1;
  60         }
  61
  62         fseek(file, 0, SEEK_SET);
  63
  64         /* read in IMPM sig */
  65         fread(it_header.sig, 1, 4, file);
  66
  67         for(int i = 0; i < 4; i++)
  68                 printf("%c", it_header.sig[i]);
  69         printf("\n");
  70
  71         /* read in songname */
  72         fread(it_header.songname, 1, 26, file);
  73         printf("%s\n", it_header.songname);
  74
  75         /* read in PHiligt */
  76
  77         /* read in OrdNum */
  78         fseek(file, 0x20, SEEK_SET);
  79         //swap bytes
  80         fread(&it_header.ord_num, 1, 2, file);
  81         printf("Ordnum: %04x\n", it_header.ord_num);
  82         //it_header.ord_num = short_byteswap(it_header.ord_num);
  83         //printf("Ordnum: %04x\n", it_header.ord_num);
  84
  85         /*read in insnum*/
  86         fread(&it_header.ins_num, 1, 2, file);
  87         //it_header.ins_num = short_byteswap(it_header.ins_num);
  88         printf("insnum: %d\n", it_header.ins_num);
  89
  90         /* read in sampnum */
  91         fread(&it_header.smp_num, 1, 2, file);
  92         //it_header.smp_num = short_byteswap(it_header.smp_num);
  93         printf("smpnum: %d\n", it_header.smp_num);
  94
  95         /* read in patnum */
  96         fread(&it_header.pat_num, 1, 2, file);
  97         printf("patnum: %d\n", it_header.pat_num);
  98
  99         /* read in created with tracker version */
 100         fread(&it_header.cwt, 1, 2, file);
 101         printf("created with tracker version: %04x\n", it_header.cwt);
 102
 103         /* read in compatabile with tracker version greater than */
 104         fread(&it_header.cmwt, 1, 2, file);
 105         printf("compatibile with tracker version >: %04x\n", it_header.cmwt);
 106
 107         /* read in flags */
 108         fread(&it_header.flags, 1, 2, file);
 109
 110         /* read in special */
 111         fread(&it_header.special, 1, 2, file);
 112
 113         /* read in global vol. */
 114         fread(&it_header.gv, 1, 1, file);
 115         printf("global vol:%d\n", it_header.gv);
 116
 117         /* read in mix vol. */
 118         fread(&it_header.mv, 1, 1, file);
 119         printf("mix vol:%d\n", it_header.mv);
 120
 121         /* read in initial tempo and speed */
 122         fread(&it_header.is, 1, 1, file);
 123         fread(&it_header.it, 1, 1, file);
 124         printf("initial speed: %d, initial tempo: %d\n", it_header.is, it_header.it);
 125
 126         /* read in sep */
 127         fread(&it_header.sep, 1, 1, file);
 128         /* read in pwd*/
 129         fread(&it_header.pwd, 1, 1, file);
 130         /* read in msg length */
 131         fread(&it_header.msg_length, 1, 2, file);
 132         /* read in msg offset */
 133         fread(&it_header.msg_offset, 1, 4, file);
 134         /* read in 4 reserved bytes */
 135         fread(&it_header.reserved, 1, 4, file);
 136
 137         /* read in channel pans, 0x40 */
 138         for(int i = 0; i < 64; i++)
 139                 fread(&it_header.chnl_pan[i], 1, 1, file);
 140         printf("chnlpans:\n");
 141         /* read in channel volumes, 0x80 */
 142         for(int i = 0; i < 64; i++)
 143                 fread(&it_header.chnl_vol[i], 1, 1, file);
 144         printf("chnlvols:\n");
 145
 146         /* read in order of orders , 0xc0*/
 147         it_header.orders = malloc(sizeof(it_header.ord_num));
 148         fread(it_header.orders, 1, it_header.ord_num, file);
 149         for(int i = 0; i < it_header.ord_num; i++)
 150                 printf("%02x | ", it_header.orders[i]);
 151         printf("\n");
 152
 153         return 0;
 154 }