cue.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "cue.h"
   5
   6 #include "../pico_int.h"
   7 // #define elprintf(w,f,...) printf(f "\n",##__VA_ARGS__);
   8
   9 #ifdef _MSC_VER
  10 #define snprintf _snprintf
  11 #endif
  12 #ifdef __EPOC32__
  13 #define snprintf(b,s,...) sprintf(b,##__VA_ARGS__)
  14 #endif
  15
  16 static char *mystrip(char *str)
  17 {
  18         int i, len;
  19
  20         len = strlen(str);
  21         for (i = 0; i < len; i++)
  22                 if (str[i] != ' ') break;
  23         if (i > 0) memmove(str, str + i, len - i + 1);
  24
  25         len = strlen(str);
  26         for (i = len - 1; i >= 0; i--)
  27                 if (str[i] != ' ' && str[i] != '\r' && str[i] != '\n') break;
  28         str[i+1] = 0;
  29
  30         return str;
  31 }
  32
  33 static int get_token(const char *buff, char *dest, int len)
  34 {
  35         const char *p = buff;
  36         char sep = ' ';
  37         int d = 0, skip = 0;
  38
  39         while (*p && *p == ' ') {
  40                 skip++;
  41                 p++;
  42         }
  43
  44         if (*p == '\"') {
  45                 sep = '\"';
  46                 p++;
  47         }
  48         while (*p && *p != sep && d < len-1)
  49                 dest[d++] = *p++;
  50         dest[d] = 0;
  51
  52         if (sep == '\"' && *p != sep)
  53                 elprintf(EL_STATUS, "cue: bad token: \"%s\"", buff);
  54
  55         return d + skip;
  56 }
  57
  58 static char *get_ext(char *fname)
  59 {
  60         int len = strlen(fname);
  61         return (len >= 3) ? (fname + len - 3) : fname;
  62 }
  63
  64
  65 #define BEGINS(buff,str) (strncmp(buff,str,sizeof(str)-1) == 0)
  66
  67 /* note: tracks[0] is not used */
  68 cue_data_t *cue_parse(const char *fname)
  69 {
  70         char buff[256], current_file[256], buff2[32], *current_filep;
  71         FILE *f, *tmpf;
  72         int ret, count = 0, count_alloc = 2, pending_pregap = 0;
  73         cue_data_t *data;
  74         void *tmp;
  75
  76         f = fopen(fname, "r");
  77         if (f == NULL) return NULL;
  78
  79         snprintf(current_file, sizeof(current_file), "%s", fname);
  80         for (current_filep = current_file + strlen(current_file); current_filep > current_file; current_filep--)
  81                 if (current_filep[-1] == '/' || current_filep[-1] == '\\') break;
  82
  83         data = calloc(1, sizeof(*data) + count_alloc * sizeof(cue_track));
  84         if (data == NULL) {
  85                 fclose(f);
  86                 return NULL;
  87         }
  88
  89         while (!feof(f))
  90         {
  91                 tmp = fgets(buff, sizeof(buff), f);
  92                 if (tmp == NULL) break;
  93
  94                 mystrip(buff);
  95                 if (buff[0] == 0) continue;
  96                 if      (BEGINS(buff, "TITLE ") || BEGINS(buff, "PERFORMER ") || BEGINS(buff, "SONGWRITER "))
  97                         continue;       /* who would put those here? Ignore! */
  98                 else if (BEGINS(buff, "FILE "))
  99                 {
 100                         get_token(buff+5, current_filep, sizeof(current_file) - (current_filep - current_file));
 101                 }
 102                 else if (BEGINS(buff, "TRACK "))
 103                 {
 104                         count++;
 105                         if (count >= count_alloc) {
 106                                 count_alloc *= 2;
 107                                 tmp = realloc(data, sizeof(*data) + count_alloc * sizeof(cue_track));
 108                                 if (tmp == NULL) { count--; break; }
 109                                 data = tmp;
 110                         }
 111                         memset(&data->tracks[count], 0, sizeof(data->tracks[0]));
 112                         if (count == 1 || strcmp(data->tracks[1].fname, current_file) != 0)
 113                         {
 114                                 data->tracks[count].fname = strdup(current_file);
 115                                 if (data->tracks[count].fname == NULL) break;
 116
 117                                 tmpf = fopen(current_file, "rb");
 118                                 if (tmpf == NULL) {
 119                                         elprintf(EL_STATUS, "cue: bad/missing file: \"%s\"", current_file);
 120                                         count--; break;
 121                                 }
 122                                 fclose(tmpf);
 123                         }
 124                         data->tracks[count].pregap = pending_pregap;
 125                         pending_pregap = 0;
 126                         // track number
 127                         ret = get_token(buff+6, buff2, sizeof(buff2));
 128                         if (count != atoi(buff2))
 129                                 elprintf(EL_STATUS, "cue: track index mismatch: track %i is track %i in cue",
 130                                         count, atoi(buff2));
 131                         // check type
 132                         get_token(buff+6+ret, buff2, sizeof(buff2));
 133                         if      (strcmp(buff2, "MODE1/2352") == 0)
 134                                 data->tracks[count].type = CT_BIN;
 135                         else if (strcmp(buff2, "MODE1/2048") == 0)
 136                                 data->tracks[count].type = CT_ISO;
 137                         else if (strcmp(buff2, "AUDIO") == 0)
 138                         {
 139                                 if (data->tracks[count].fname != NULL)
 140                                 {
 141                                         // rely on extension, not type in cue..
 142                                         char *ext = get_ext(data->tracks[count].fname);
 143                                         if      (strcasecmp(ext, "mp3") == 0)
 144                                                 data->tracks[count].type = CT_MP3;
 145                                         else if (strcasecmp(ext, "wav") == 0)
 146                                                 data->tracks[count].type = CT_WAV;
 147                                         else {
 148                                                 elprintf(EL_STATUS, "unhandled audio format: \"%s\"",
 149                                                         data->tracks[count].fname);
 150                                         }
 151                                 }
 152                                 else
 153                                 {
 154                                         // propagate previous
 155                                         data->tracks[count].type = data->tracks[count-1].type;
 156                                 }
 157                         }
 158                         else {
 159                                 elprintf(EL_STATUS, "unhandled track type: \"%s\"", buff2);
 160                         }
 161                 }
 162                 else if (BEGINS(buff, "INDEX "))
 163                 {
 164                         int m, s, f;
 165                         // type
 166                         ret = get_token(buff+6, buff2, sizeof(buff2));
 167                         if (atoi(buff2) == 0) continue;
 168                         if (atoi(buff2) != 1) {
 169                                 elprintf(EL_STATUS, "cue: don't know how to handle: \"%s\"", buff);
 170                                 count--; break;
 171                         }
 172                         // offset in file
 173                         get_token(buff+6+ret, buff2, sizeof(buff2));
 174                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 175                         if (ret != 3) {
 176                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 177                                 count--; break;
 178                         }
 179                         data->tracks[count].sector_offset = m*60*75 + s*75 + f;
 180                         // some strange .cues may need this
 181                         if (data->tracks[count].fname != NULL && strcmp(data->tracks[count].fname, current_file) != 0)
 182                         {
 183                                 free(data->tracks[count].fname);
 184                                 data->tracks[count].fname = strdup(current_file);
 185                         }
 186                         if (data->tracks[count].fname == NULL && strcmp(data->tracks[1].fname, current_file) != 0)
 187                         {
 188                                 data->tracks[count].fname = strdup(current_file);
 189                         }
 190                 }
 191                 else if (BEGINS(buff, "PREGAP ") || BEGINS(buff, "POSTGAP "))
 192                 {
 193                         int m, s, f;
 194                         get_token(buff+7, buff2, sizeof(buff2));
 195                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 196                         if (ret != 3) {
 197                                 elprintf(EL_STATUS, "cue: failed to parse: \"%s\"", buff);
 198                                 continue;
 199                         }
 200                         // pregap overrides previous postgap?
 201                         // by looking at some .cues produced by some programs I've decided that..
 202                         if (BEGINS(buff, "PREGAP "))
 203                                 data->tracks[count].pregap = m*60*75 + s*75 + f;
 204                         else
 205                                 pending_pregap = m*60*75 + s*75 + f;
 206                 }
 207                 else if (BEGINS(buff, "REM LENGTH ")) // custom "extension"
 208                 {
 209                         int m, s, f;
 210                         get_token(buff+11, buff2, sizeof(buff2));
 211                         ret = sscanf(buff2, "%d:%d:%d", &m, &s, &f);
 212                         if (ret != 3) continue;
 213                         data->tracks[count].sector_xlength = m*60*75 + s*75 + f;
 214                 }
 215                 else if (BEGINS(buff, "REM"))
 216                         continue;
 217                 else
 218                 {
 219                         elprintf(EL_STATUS, "cue: unhandled line: \"%s\"", buff);
 220                 }
 221         }
 222
 223         if (count < 1 || data->tracks[1].fname == NULL) {
 224                 // failed..
 225                 for (; count > 0; count--)
 226                         if (data->tracks[count].fname != NULL)
 227                                 free(data->tracks[count].fname);
 228                 free(data);
 229                 return NULL;
 230         }
 231
 232         data->track_count = count;
 233         return data;
 234 }
 235
 236
 237 void cue_destroy(cue_data_t *data)
 238 {
 239         int c;
 240
 241         if (data == NULL) return;
 242
 243         for (c = data->track_count; c > 0; c--)
 244                 if (data->tracks[c].fname != NULL)
 245                         free(data->tracks[c].fname);
 246         free(data);
 247 }
 248
 249
 250 #if 0
 251 int main(int argc, char *argv[])
 252 {
 253         cue_data_t *data = cue_parse(argv[1]);
 254         int c;
 255
 256         if (data == NULL) return 1;
 257
 258         for (c = 1; c <= data->track_count; c++)
 259                 printf("%2i: %i %9i %02i:%02i:%02i %9i %s\n", c, data->tracks[c].type, data->tracks[c].sector_offset,
 260                         data->tracks[c].sector_offset / (75*60), data->tracks[c].sector_offset / 75 % 60,
 261                         data->tracks[c].sector_offset % 75, data->tracks[c].pregap, data->tracks[c].fname);
 262
 263         cue_destroy(data);
 264
 265         return 0;
 266 }
 267 #endif
 268