Pico/cd/cue.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "cue.h"
   5
   6 #include "../PicoInt.h"
   7 // #define elprintf(w,f,...) printf(f "\n",##__VA_ARGS__);
   8
   9 static char *mystrip(char *str)
  10 {
  11         int i, len;
  12
  13         len = strlen(str);
  14         for (i = 0; i < len; i++)
  15                 if (str[i] != ' ') break;
  16         if (i > 0) memmove(str, str + i, len - i + 1);
  17
  18         len = strlen(str);
  19         for (i = len - 1; i >= 0; i--)
  20                 if (str[i] != ' ' && str[i] != '\r' && str[i] != '\n') break;
  21         str[i+1] = 0;
  22
  23         return str;
  24 }
  25
  26 static int get_token(const char *buff, char *dest, int len)
  27 {
  28         const char *p = buff;
  29         char sep = ' ';
  30         int d = 0, skip = 0;
  31
  32         while (*p && *p == ' ') {
  33                 skip++;
  34                 p++;
  35         }
  36
  37         if (*p == '\"') {
  38                 sep = '\"';
  39                 p++;
  40         }
  41         while (*p && *p != sep && d < len-1)
  42                 dest[d++] = *p++;
  43         dest[d] = 0;
  44
  45         if (sep == '\"' && *p != sep)
  46                 elprintf(EL_STATUS, "cue: bad token: \"%s\"", buff);
  47
  48         return d + skip;
  49 }
  50
  51 static char *get_ext(char *fname)
  52 {
  53         int len = strlen(fname);
  54         return (len >= 3) ? (fname + len - 3) : fname;
  55 }
  56
  57
  58 #define BEGINS(buff,str) (strncmp(buff,str,sizeof(str)-1) == 0)
  59
  60 /* note: tracks[0] is not used */
  61 cue_data_t *cue_parse(const char *fname)
  62 {
  63         char buff[256], current_file[256], buff2[32], *current_filep;
  64         FILE *f, *tmpf;
  65         int ret, count = 0, count_alloc = 2, pending_pregap = 0;
  66         cue_data_t *data;
  67         void *tmp;
  68
  69         f = fopen(fname, "r");
  70         if (f == NULL) return NULL;
  71
  72         snprintf(current_file, sizeof(current_file), "%s", fname);
  73         for (current_filep = current_file + strlen(current_file); current_filep > current_file; current_filep--)
  74                 if (current_filep[-1] == '/' || current_filep[-1] == '\\') break;
  75
  76         data = calloc(1, sizeof(*data) + count_alloc * sizeof(cue_track));
  77         if (data == NULL) {
  78                 fclose(f);
  79                 return NULL;
  80         }
  81
  82         while (!feof(f))
  83         {
  84                 tmp = fgets(buff, sizeof(buff), f);
  85                 if (tmp == NULL) break;
  86
  87                 mystrip(buff);
  88                 if (buff[0] == 0) continue;
  89                 if      (BEGINS(buff, "REM"))
  90                         continue;
  91                 else if (BEGINS(buff, "TITLE ") || BEGINS(buff, "PERFORMER ") || BEGINS(buff, "SONGWRITER "))
  92                         continue;       /* who would put those here? Ignore! */
  93                 else if (BEGINS(buff, "FILE "))
  94                 {
  95                         get_token(buff+5, current_filep, sizeof(current_file) - (current_filep - current_file));
  96                 }
  97                 else if (BEGINS(buff, "TRACK "))
  98                 {
  99                         count++;
 100                         if (count >= count_alloc) {
 101                                 count_alloc *= 2;
 102                                 tmp = realloc(data, sizeof(*data) + count_alloc * sizeof(cue_track));
 103                                 if (tmp == NULL) { count--; break; }
 104                                 data = tmp;
 105                         }
 106                         memset(&data->tracks[count], 0, sizeof(data->tracks[0]));
 107                         if (count == 1 || strcmp(data->tracks[1].fname, current_file) != 0)
 108                         {
 109                                 data->tracks[count].fname = strdup(current_file);
 110                                 if (data->tracks[count].fname == NULL) break;
 111
 112                                 tmpf = fopen(current_file, "rb");
 113                                 if (tmpf == NULL) {
 114                                         elprintf(EL_STATUS, "cue: bad/missing file: \"%s\"", current_file);
 115                                         count--; break;
 116                                 }
 117                                 fclose(tmpf);
 118                         }
 119                         data->tracks[count].pregap = pending_pregap;
 120                         pending_pregap = 0;
 121                         // track number
 122                         ret = get_token(buff+6, buff2, sizeof(buff2));
 123                         if (count != atoi(buff2))
 124                                 elprintf(EL_STATUS, "cue: track index mismatch: track %i is track %i in cue",
 125                                         count, atoi(buff2));
 126                         // check type
 127                         get_token(buff+6+ret, buff2, sizeof(buff2));
 128                         if      (strcmp(buff2, "MODE1/2352") == 0)
 129                                 data->tracks[count].type = CT_BIN;
 130                         else if (strcmp(buff2, "MODE1/2048") == 0)
 131                                 data->tracks[count].type = CT_ISO;
 132                         else if (strcmp(buff2, "AUDIO") == 0)
 133                         {
 134                                 if (data->tracks[count].fname != NULL)
 135                                 {
 136                                         // rely on extension, not type in cue..
 137                                         char *ext = get_ext(data->tracks[count].fname);
 138                                         if      (strcasecmp(ext, "mp3") == 0)
 139                                                 data->tracks[count].type = CT_MP3;
 140                                         else if (strcasecmp(ext, "wav") == 0)
 141                                                 data->tracks[count].type = CT_WAV;
 142                                         else {
 143                                                 elprintf(EL_STATUS, "unhandled audio format: \"%s\"",
 144                                                         data->tracks[count].fname);
 145                                         }
 146                                 }
 147                                 else
 148                                 {
 149                                         // propagate previous
 150                                         data->tracks[count].type = data->tracks[count-1].type;
 151                                 }
 152                         }
 153                         else {
 154                                 elprintf(EL_STATUS, "unhandled track type: \"%s\"", buff2);
 155                         }
 156                 }
 157                 else if (BEGINS(buff, "INDEX "))
 158                 {
 159                         int m, s, f;
 160                         // type
 161                         ret = get_token(buff+6, buff2, sizeof(buff2));
 162                         if (atoi(buff2) == 0) continue;
 163                         if (atoi(buff2) != 1) {
 164                                 elprintf(EL_STATUS, "cue: don't know how to handle: \"%s\"", buff);
 165                                 count--; break;
 166                         }
 167                         // offset in file
 168                         get_token(buff+6+ret, buff2, sizeof(buff2));
 169                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 170                         if (ret != 3) {
 171                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 172                                 count--; break;
 173                         }
 174                         data->tracks[count].sector_offset = m*60*75 + s*75 + f;
 175                         // some strange .cues may need this
 176                         if (data->tracks[count].fname != NULL && strcmp(data->tracks[count].fname, current_file) != 0)
 177                         {
 178                                 free(data->tracks[count].fname);
 179                                 data->tracks[count].fname = strdup(current_file);
 180                         }
 181                         if (data->tracks[count].fname == NULL && strcmp(data->tracks[1].fname, current_file) != 0)
 182                         {
 183                                 data->tracks[count].fname = strdup(current_file);
 184                         }
 185                 }
 186                 else if (BEGINS(buff, "PREGAP ") || BEGINS(buff, "POSTGAP "))
 187                 {
 188                         int m, s, f;
 189                         get_token(buff+7, buff2, sizeof(buff2));
 190                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 191                         if (ret != 3) {
 192                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 193                                 continue;
 194                         }
 195                         // pregap overrides previous postgap?
 196                         // by looking at some .cues produced by some programs I've decided that..
 197                         if (BEGINS(buff, "PREGAP "))
 198                                 data->tracks[count].pregap = m*60*75 + s*75 + f;
 199                         else
 200                                 pending_pregap = m*60*75 + s*75 + f;
 201                 }
 202                 else
 203                 {
 204                         elprintf(EL_STATUS, "cue: unhandled line: \"%s\"", buff);
 205                 }
 206         }
 207
 208         if (count < 1 || data->tracks[1].fname == NULL) {
 209                 // failed..
 210                 for (; count > 0; count--)
 211                         if (data->tracks[count].fname != NULL)
 212                                 free(data->tracks[count].fname);
 213                 free(data);
 214                 return NULL;
 215         }
 216
 217         data->track_count = count;
 218         return data;
 219 }
 220
 221
 222 void cue_destroy(cue_data_t *data)
 223 {
 224         int c;
 225
 226         if (data == NULL) return;
 227
 228         for (c = data->track_count; c > 0; c--)
 229                 if (data->tracks[c].fname != NULL)
 230                         free(data->tracks[c].fname);
 231         free(data);
 232 }
 233
 234
 235 #if 0
 236 int main(int argc, char *argv[])
 237 {
 238         cue_data_t *data = cue_parse(argv[1]);
 239         int c;
 240
 241         if (data == NULL) return 1;
 242
 243         for (c = 1; c <= data->track_count; c++)
 244                 printf("%2i: %i %9i %02i:%02i:%02i %9i %s\n", c, data->tracks[c].type, data->tracks[c].sector_offset,
 245                         data->tracks[c].sector_offset / (75*60), data->tracks[c].sector_offset / 75 % 60,
 246                         data->tracks[c].sector_offset % 75, data->tracks[c].pregap, data->tracks[c].fname);
 247
 248         cue_destroy(data);
 249
 250         return 0;
 251 }
 252 #endif
 253