src/tagload.c

   1 /* coded by Ketmar // Vampire Avalon (psyc://ketmar.no-ip.org/~Ketmar)
   2  * Understanding is not required. Only obedience.
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 ////////////////////////////////////////////////////////////////////////////////
  18 // augment UTHASH with two more macrodefs
  19 #define HASH_FIND_PTR_EX(hh,head,findptr,out)  HASH_FIND(hh,head,findptr,sizeof(void *),out)
  20 #define HASH_ADD_PTR_EX(hh,head,ptrfield,add)  HASH_ADD(hh,head,ptrfield,sizeof(void *),add)
  21
  22 #define HASH_FIND_STR_EX(hh,head,findstr,out)  HASH_FIND(hh,head,findstr,strlen(findstr),out)
  23 #define HASH_ADD_STR_EX(hh,head,strfield,add)  HASH_ADD(hh,head,strfield,strlen(add->strfield),add)
  24
  25 #define HASH_FIND_UINT32(head,findint,out)              HASH_FIND(hh,head,findint,sizeof(uint32_t),out)
  26 #define HASH_ADD_UINT32(head,intfield,add)              HASH_ADD(hh,head,intfield,sizeof(uint32_t),add)
  27 #define HASH_REPLACE_UINT32(head,intfield,add,replaced) HASH_REPLACE(hh,head,intfield,sizeof(uint32_t),add,replaced)
  28
  29
  30 ////////////////////////////////////////////////////////////////////////////////
  31 enum {
  32   TFL_YEAR,
  33   TFL_ARTIST_O,
  34   TFL_ARTIST_T,
  35   TFL_ALBUM_O,
  36   TFL_ALBUM_T,
  37   TFL_TITLE_O,
  38   TFL_TITLE_T,
  39   TFL_GENRE_O,
  40   TFL_GENRE_T,
  41   TFL_YRAL_O,
  42   TFL_YRAL_T,
  43   TFL_MAX
  44 };
  45
  46
  47 typedef struct __attribute__((packed,gcc_struct)) {
  48   uint32_t count;
  49   uint32_t idx;
  50 } fl_tfl_t;
  51
  52 typedef struct __attribute__((packed,gcc_struct)) {
  53   uint32_t value;
  54   fl_tfl_t tfl[TFL_MAX];
  55 } fl_tagvalue_t;
  56
  57
  58 typedef struct __attribute__((packed,gcc_struct)) {
  59   uint32_t realname;
  60   uint32_t shortname;
  61 #ifdef USE_DEVID_INODE
  62   uint64_t devid;
  63   uint64_t inode;
  64 #endif
  65   uint64_t size;
  66   uint64_t mtime;
  67   uint8_t tracknum;
  68   uint16_t year;
  69   union {
  70     struct {
  71       uint32_t year_tag;
  72       uint32_t artist_o, artist_t;
  73       uint32_t album_o, album_t;
  74       uint32_t title_o, title_t;
  75       uint32_t genre_o, genre_t;
  76       uint32_t yral_o, yral_t;
  77     };
  78     uint32_t tags[TFL_MAX];
  79   };
  80 } fl_fileinfo_t;
  81
  82
  83 ////////////////////////////////////////////////////////////////////////////////
  84 static uint32_t file_count = 0, tag_count = 0, string_bytes = 0, o_tag_count = 0, t_tag_count = 0, tfl_bytes = 0;
  85 static uint8_t *string_data = NULL;
  86 static fl_fileinfo_t *fileinfo_data = NULL;
  87 static fl_tagvalue_t *tagvalue_data = NULL;
  88 static uint32_t *taglisto_data = NULL;
  89 static uint32_t *taglistt_data = NULL;
  90 static uint32_t *tfl_data = NULL;
  91
  92 static inline fl_tagvalue_t *get_tv (uint32_t idx) { return (idx < tag_count ? &tagvalue_data[idx] : NULL); }
  93 static inline fl_fileinfo_t *get_fi (uint32_t idx) { return (idx < file_count ? &fileinfo_data[idx] : NULL); }
  94
  95 static inline uint32_t tv2idx (const fl_tagvalue_t *tv) { return (tv != NULL ? (uintptr_t)((const uint8_t *)tv-(const uint8_t *)tagvalue_data)/sizeof(*tv) : 0); }
  96 static inline uint32_t fi2idx (const fl_fileinfo_t *fi) { return (fi != NULL ? (uintptr_t)((const uint8_t *)fi-(const uint8_t *)fileinfo_data)/sizeof(*fi) : 0); }
  97
  98 static inline char *get_str (uint32_t ofs) { return (ofs >= 2 && ofs < string_bytes ? (char *)(string_data+ofs) : NULL); }
  99 static inline int get_strlen (uint32_t ofs) { return (ofs < string_bytes ? *((const uint16_t *)(string_data+ofs-2)) : 0); }
 100
 101
 102 ////////////////////////////////////////////////////////////////////////////////
 103 static void tagdb_unload (void) {
 104   file_count = tag_count = string_bytes = o_tag_count = t_tag_count = tfl_bytes = 0;
 105   if (string_data != NULL) free(string_data);
 106   if (fileinfo_data != NULL) free(fileinfo_data);
 107   if (tagvalue_data != NULL) free(tagvalue_data);
 108   if (taglisto_data != NULL) free(taglisto_data);
 109   if (taglistt_data != NULL) free(taglistt_data);
 110   if (tfl_data != NULL) free(tfl_data);
 111   //
 112   string_data = NULL;
 113   fileinfo_data = NULL;
 114   tagvalue_data = NULL;
 115   taglisto_data = NULL;
 116   taglistt_data = NULL;
 117   tfl_data = NULL;
 118 }
 119
 120
 121 ////////////////////////////////////////////////////////////////////////////////
 122 static int tagdb_load (const char *fname) {
 123   FILE *fl;
 124   char sign[4];
 125   //
 126 #if defined(NDEBUG) && NDEBUG
 127 # define showofs()  ((void)0)
 128 #else
 129   void showofs (void) {
 130     dlogf("OFS: 0x%08x\n", (unsigned)ftell(fl));
 131   }
 132 #endif
 133   //
 134   tagdb_unload();
 135   fl = fopen(fname, "r");
 136   if (fl == NULL) return -1; // no tags
 137   // header
 138   if (fread(sign, 4, 1, fl) != 1) goto error;
 139 #ifdef USE_DEVID_INODE
 140   if (memcmp(sign, "MTD0", 4) != 0) goto error;
 141 #else
 142   if (memcmp(sign, "MTD2", 4) != 0) goto error;
 143 #endif
 144   if (fread(&file_count, 4, 1, fl) != 1) goto error;
 145   if (fread(&tag_count, 4, 1, fl) != 1) goto error;
 146   if (fread(&string_bytes, 4, 1, fl) != 1) goto error;
 147   if (fread(&tfl_bytes, 4, 1, fl) != 1) goto error;
 148   if (fread(&o_tag_count, 4, 1, fl) != 1) goto error;
 149   if (fread(&t_tag_count, 4, 1, fl) != 1) goto error;
 150   //
 151   //dlogf("%u\n", sizeof(fl_tagvalue_t));
 152   dlogf("file_count=%u\n", file_count);
 153   dlogf("tag_count=%u\n", tag_count);
 154   dlogf("string_bytes=%u\n", string_bytes);
 155   dlogf("tfl_bytes=%u\n", tfl_bytes);
 156   dlogf("o_tag_count=%u\n", o_tag_count);
 157   dlogf("t_tag_count=%u\n", t_tag_count);
 158   //
 159   if (file_count < 1 || tag_count < 1 || string_bytes < 3 || tfl_bytes < 1 || o_tag_count < 1 || t_tag_count < 1) goto error; // invalid or empty file
 160   //
 161   printf("loading %u files...\n", (unsigned int)file_count);
 162   dlogf("loading strings...\n");
 163   showofs();
 164   if ((string_data = malloc(string_bytes)) == NULL) goto error;
 165   if (fread(string_data, string_bytes, 1, fl) != 1) goto error;
 166   //
 167   dlogf("loading taglisto...\n");
 168   showofs();
 169   if ((taglisto_data = malloc(o_tag_count*sizeof(uint32_t))) == NULL) goto error;
 170   if (fread(taglisto_data, o_tag_count*sizeof(uint32_t), 1, fl) != 1) goto error;
 171   //
 172   dlogf("loading taglistt...\n");
 173   showofs();
 174   if ((taglistt_data = malloc(t_tag_count*sizeof(uint32_t))) == NULL) goto error;
 175   if (fread(taglistt_data, t_tag_count*sizeof(uint32_t), 1, fl) != 1) goto error;
 176   //
 177   dlogf("loading fileinfo...\n");
 178   showofs();
 179   if ((fileinfo_data = malloc(file_count*sizeof(fl_fileinfo_t))) == NULL) goto error;
 180   if (fread(fileinfo_data, file_count*sizeof(fl_fileinfo_t), 1, fl) != 1) goto error;
 181   //
 182   dlogf("loading taginfo...\n");
 183   showofs();
 184   if ((tagvalue_data = malloc(tag_count*sizeof(fl_tagvalue_t))) == NULL) goto error;
 185   if (fread(tagvalue_data, tag_count*sizeof(fl_tagvalue_t), 1, fl) != 1) goto error;
 186   //
 187   dlogf("loading tfl...\n");
 188   showofs();
 189   if ((tfl_data = malloc(tfl_bytes)) == NULL) goto error;
 190   if (fread(tfl_data, tfl_bytes, 1, fl) != 1) goto error;
 191   //
 192   dlogf("done\n");
 193   fclose(fl);
 194   //
 195   return 0;
 196 error:
 197   // invalid tag file
 198   fclose(fl);
 199   tagdb_unload();
 200   return -1;
 201 }