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, "TITLE ") || BEGINS(buff, "PERFORMER ") || BEGINS(buff, "SONGWRITER "))
  90                         continue;       /* who would put those here? Ignore! */
  91                 else if (BEGINS(buff, "FILE "))
  92                 {
  93                         get_token(buff+5, current_filep, sizeof(current_file) - (current_filep - current_file));
  94                 }
  95                 else if (BEGINS(buff, "TRACK "))
  96                 {
  97                         count++;
  98                         if (count >= count_alloc) {
  99                                 count_alloc *= 2;
 100                                 tmp = realloc(data, sizeof(*data) + count_alloc * sizeof(cue_track));
 101                                 if (tmp == NULL) { count--; break; }
 102                                 data = tmp;
 103                         }
 104                         memset(&data->tracks[count], 0, sizeof(data->tracks[0]));
 105                         if (count == 1 || strcmp(data->tracks[1].fname, current_file) != 0)
 106                         {
 107                                 data->tracks[count].fname = strdup(current_file);
 108                                 if (data->tracks[count].fname == NULL) break;
 109
 110                                 tmpf = fopen(current_file, "rb");
 111                                 if (tmpf == NULL) {
 112                                         elprintf(EL_STATUS, "cue: bad/missing file: \"%s\"", current_file);
 113                                         count--; break;
 114                                 }
 115                                 fclose(tmpf);
 116                         }
 117                         data->tracks[count].pregap = pending_pregap;
 118                         pending_pregap = 0;
 119                         // track number
 120                         ret = get_token(buff+6, buff2, sizeof(buff2));
 121                         if (count != atoi(buff2))
 122                                 elprintf(EL_STATUS, "cue: track index mismatch: track %i is track %i in cue",
 123                                         count, atoi(buff2));
 124                         // check type
 125                         get_token(buff+6+ret, buff2, sizeof(buff2));
 126                         if      (strcmp(buff2, "MODE1/2352") == 0)
 127                                 data->tracks[count].type = CT_BIN;
 128                         else if (strcmp(buff2, "MODE1/2048") == 0)
 129                                 data->tracks[count].type = CT_ISO;
 130                         else if (strcmp(buff2, "AUDIO") == 0)
 131                         {
 132                                 if (data->tracks[count].fname != NULL)
 133                                 {
 134                                         // rely on extension, not type in cue..
 135                                         char *ext = get_ext(data->tracks[count].fname);
 136                                         if      (strcasecmp(ext, "mp3") == 0)
 137                                                 data->tracks[count].type = CT_MP3;
 138                                         else if (strcasecmp(ext, "wav") == 0)
 139                                                 data->tracks[count].type = CT_WAV;
 140                                         else {
 141                                                 elprintf(EL_STATUS, "unhandled audio format: \"%s\"",
 142                                                         data->tracks[count].fname);
 143                                         }
 144                                 }
 145                                 else
 146                                 {
 147                                         // propagate previous
 148                                         data->tracks[count].type = data->tracks[count-1].type;
 149                                 }
 150                         }
 151                         else {
 152                                 elprintf(EL_STATUS, "unhandled track type: \"%s\"", buff2);
 153                         }
 154                 }
 155                 else if (BEGINS(buff, "INDEX "))
 156                 {
 157                         int m, s, f;
 158                         // type
 159                         ret = get_token(buff+6, buff2, sizeof(buff2));
 160                         if (atoi(buff2) == 0) continue;
 161                         if (atoi(buff2) != 1) {
 162                                 elprintf(EL_STATUS, "cue: don't know how to handle: \"%s\"", buff);
 163                                 count--; break;
 164                         }
 165                         // offset in file
 166                         get_token(buff+6+ret, buff2, sizeof(buff2));
 167                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 168                         if (ret != 3) {
 169                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 170                                 count--; break;
 171                         }
 172                         data->tracks[count].sector_offset = m*60*75 + s*75 + f;
 173                         // some strange .cues may need this
 174                         if (data->tracks[count].fname != NULL && strcmp(data->tracks[count].fname, current_file) != 0)
 175                         {
 176                                 free(data->tracks[count].fname);
 177                                 data->tracks[count].fname = strdup(current_file);
 178                         }
 179                         if (data->tracks[count].fname == NULL && strcmp(data->tracks[1].fname, current_file) != 0)
 180                         {
 181                                 data->tracks[count].fname = strdup(current_file);
 182                         }
 183                 }
 184                 else if (BEGINS(buff, "PREGAP ") || BEGINS(buff, "POSTGAP "))
 185                 {
 186                         int m, s, f;
 187                         get_token(buff+7, buff2, sizeof(buff2));
 188                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 189                         if (ret != 3) {
 190                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 191                                 continue;
 192                         }
 193                         // pregap overrides previous postgap?
 194                         // by looking at some .cues produced by some programs I've decided that..
 195                         if (BEGINS(buff, "PREGAP "))
 196                                 data->tracks[count].pregap = m*60*75 + s*75 + f;
 197                         else
 198                                 pending_pregap = m*60*75 + s*75 + f;
 199                 }
 200                 else if (BEGINS(buff, "REM LENGTH ")) // custom "extension"
 201                 {
 202                         int m, s, f;
 203                         get_token(buff+11, buff2, sizeof(buff2));
 204                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 205                         if (ret != 3) continue;
 206                         data->tracks[count].sector_xlength = m*60*75 + s*75 + f;
 207                 }
 208                 else if (BEGINS(buff, "REM"))
 209                         continue;
 210                 else
 211                 {
 212                         elprintf(EL_STATUS, "cue: unhandled line: \"%s\"", buff);
 213                 }
 214         }
 215
 216         if (count < 1 || data->tracks[1].fname == NULL) {
 217                 // failed..
 218                 for (; count > 0; count--)
 219                         if (data->tracks[count].fname != NULL)
 220                                 free(data->tracks[count].fname);
 221                 free(data);
 222                 return NULL;
 223         }
 224
 225         data->track_count = count;
 226         return data;
 227 }
 228
 229
 230 void cue_destroy(cue_data_t *data)
 231 {
 232         int c;
 233
 234         if (data == NULL) return;
 235
 236         for (c = data->track_count; c > 0; c--)
 237                 if (data->tracks[c].fname != NULL)
 238                         free(data->tracks[c].fname);
 239         free(data);
 240 }
 241
 242
 243 #if 0
 244 int main(int argc, char *argv[])
 245 {
 246         cue_data_t *data = cue_parse(argv[1]);
 247         int c;
 248
 249         if (data == NULL) return 1;
 250
 251         for (c = 1; c <= data->track_count; c++)
 252                 printf("%2i: %i %9i %02i:%02i:%02i %9i %s\n", c, data->tracks[c].type, data->tracks[c].sector_offset,
 253                         data->tracks[c].sector_offset / (75*60), data->tracks[c].sector_offset / 75 % 60,
 254                         data->tracks[c].sector_offset % 75, data->tracks[c].pregap, data->tracks[c].fname);
 255
 256         cue_destroy(data);
 257
 258         return 0;
 259 }
 260 #endif
 261