afh.c

   1 /* Copyright (C) 2008 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file afh.c Paraslash's standalone audio format handler tool. */
   4
   5 #include <regex.h>
   6 #include <lopsub.h>
   7
   8 #include "afh.lsg.h"
   9 #include "para.h"
  10 #include "string.h"
  11 #include "fd.h"
  12 #include "afh.h"
  13 #include "error.h"
  14 #include "version.h"
  15
  16 /** Array of error strings. */
  17 DEFINE_PARA_ERRLIST;
  18
  19 static struct lls_parse_result *lpr;
  20
  21 #define CMD_PTR (lls_cmd(0, afh_suite))
  22 #define OPT_RESULT(_name) (lls_opt_result(LSG_AFH_PARA_AFH_OPT_ ## _name, lpr))
  23 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
  24 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
  25 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
  26
  27 static int loglevel;
  28 INIT_STDERR_LOGGING(loglevel)
  29
  30 static inline bool tag_needs_update(bool given, const char *tag,
  31                 const char *arg)
  32 {
  33         return given && (!tag || strcmp(tag, arg) != 0);
  34 }
  35
  36 static int rewrite_tags(const char *name, int input_fd, void *map,
  37                 size_t map_size, int audio_format_id, struct afh_info *afhi)
  38 {
  39         struct taginfo *tags = &afhi->tags;
  40         bool modified = false;
  41         char *tmp_name;
  42         const char *arg;
  43         int output_fd = -1, ret;
  44         struct stat sb;
  45
  46         arg = OPT_STRING_VAL(YEAR);
  47         if (tag_needs_update(OPT_GIVEN(YEAR), tags->year, arg)) {
  48                 free(tags->year);
  49                 tags->year = para_strdup(arg);
  50                 modified = true;
  51         }
  52         arg = OPT_STRING_VAL(TITLE);
  53         if (tag_needs_update(OPT_GIVEN(TITLE), tags->title, arg)) {
  54                 free(tags->title);
  55                 tags->title = para_strdup(arg);
  56                 modified = true;
  57         }
  58         arg = OPT_STRING_VAL(ARTIST);
  59         if (tag_needs_update(OPT_GIVEN(ARTIST), tags->artist, arg)) {
  60                 free(tags->artist);
  61                 tags->artist = para_strdup(arg);
  62                 modified = true;
  63         }
  64         arg = OPT_STRING_VAL(ALBUM);
  65         if (tag_needs_update(OPT_GIVEN(ALBUM), tags->album, arg)) {
  66                 free(tags->album);
  67                 tags->album = para_strdup(arg);
  68                 modified = true;
  69         }
  70         arg = OPT_STRING_VAL(COMMENT);
  71         if (tag_needs_update(OPT_GIVEN(COMMENT), tags->comment, arg)) {
  72                 free(tags->comment);
  73                 tags->comment = para_strdup(arg);
  74                 modified = true;
  75         }
  76         if (!modified) {
  77                 PARA_WARNING_LOG("no modifications necessary\n");
  78                 return 0;
  79         }
  80         /*
  81          * mkstmp() creates the temporary file with permissions 0600, but we
  82          * like it to have the same permissions as the original file, so we
  83          * have to get this information.
  84          */
  85         if (fstat(input_fd, &sb) < 0) {
  86                 ret = -ERRNO_TO_PARA_ERROR(errno);
  87                 PARA_ERROR_LOG("failed to fstat fd %d (%s)\n", input_fd, name);
  88                 return ret;
  89         }
  90         tmp_name = make_message("%s.XXXXXX", name);
  91         ret = mkstemp(tmp_name);
  92         if (ret < 0) {
  93                 ret = -ERRNO_TO_PARA_ERROR(errno);
  94                 PARA_ERROR_LOG("could not create temporary file\n");
  95                 goto out;
  96         }
  97         output_fd = ret;
  98         if (fchmod(output_fd, sb.st_mode) < 0) {
  99                 ret = -ERRNO_TO_PARA_ERROR(errno);
 100                 PARA_ERROR_LOG("failed to fchmod fd %d (%s)\n", output_fd,
 101                         tmp_name);
 102                 goto out;
 103         }
 104         ret = afh_rewrite_tags(audio_format_id, map, map_size, tags, output_fd,
 105                 tmp_name);
 106         if (ret < 0)
 107                 goto out;
 108         if (OPT_GIVEN(BACKUP)) {
 109                 char *backup_name = make_message("%s~", name);
 110                 ret = xrename(name, backup_name);
 111                 free(backup_name);
 112                 if (ret < 0)
 113                         goto out;
 114         }
 115         ret = xrename(tmp_name, name);
 116         if (ret < 0)
 117                 goto out;
 118         if (OPT_GIVEN(PRESERVE)) {
 119                 struct timespec times[2]; /* [0]: atime, [1]: mtime */
 120                 times[0].tv_nsec = UTIME_OMIT;
 121                 times[1] = sb.st_mtim;
 122                 /*
 123                  * We might well have written a file of identical size. If we
 124                  * keep the mtime as well, we might fool backup applications
 125                  * like rsync which skip files whose size and mtime haven't
 126                  * changed. So we change the mtime slightly.
 127                  */
 128                 times[1].tv_sec++;
 129                 if (futimens(output_fd, times) < 0) {
 130                         ret = -ERRNO_TO_PARA_ERROR(errno);
 131                         goto out;
 132                 }
 133         }
 134 out:
 135         if (ret < 0 && output_fd >= 0)
 136                 unlink(tmp_name); /* ignore errors */
 137         free(tmp_name);
 138         if (output_fd >= 0)
 139                 close(output_fd);
 140         return ret;
 141 }
 142
 143 static void print_info(int audio_format_num, struct afh_info *afhi)
 144 {
 145         char *msg;
 146
 147         afh_get_afhi_txt(audio_format_num, afhi, &msg);
 148         printf("%s", msg);
 149         free(msg);
 150 }
 151
 152 static void print_chunk_table(struct afh_info *afhi, int audio_format_id,
 153                 const void *map, size_t mapsize)
 154 {
 155         int i, ret;
 156         void *ctx = NULL;
 157
 158         for (i = 0; i < afhi->chunks_total; i++) {
 159                 struct timeval tv;
 160                 long unsigned from, to;
 161                 const char *buf;
 162                 uint32_t len;
 163                 tv_scale(i, &afhi->chunk_tv, &tv);
 164                 from = tv2ms(&tv);
 165                 tv_scale(i + 1, &afhi->chunk_tv, &tv);
 166                 to = tv2ms(&tv);
 167                 ret = afh_get_chunk(i, afhi, audio_format_id, map, mapsize,
 168                         &buf, &len, &ctx);
 169                 if (ret < 0) {
 170                         PARA_ERROR_LOG("fatal: chunk %d: %s\n", i,
 171                                 para_strerror(-ret));
 172                         return;
 173                 }
 174                 if (!OPT_GIVEN(PARSER_FRIENDLY))
 175                         printf("%d [%lu.%03lu - %lu.%03lu] ", i, from / 1000,
 176                                 from % 1000, to / 1000, to % 1000);
 177                 printf("%td - %td", buf - (const char *)map,
 178                         buf + len - (const char *)map);
 179                 if (!OPT_GIVEN(PARSER_FRIENDLY))
 180                         printf(" (%u)", len);
 181                 printf("\n");
 182         }
 183         afh_close(ctx, audio_format_id);
 184 }
 185
 186 static void handle_help_flags(void)
 187 {
 188         char *help;
 189
 190         if (OPT_GIVEN(DETAILED_HELP))
 191                 help = lls_long_help(CMD_PTR);
 192         else if (OPT_GIVEN(HELP) || lls_num_inputs(lpr) == 0)
 193                 help = lls_short_help(CMD_PTR);
 194         else
 195                 return;
 196         printf("%s", help);
 197         free(help);
 198         printf("Supported audio formats\n  %s\n", AUDIO_FORMAT_HANDLERS);
 199         exit(EXIT_SUCCESS);
 200 }
 201
 202 /**
 203  * The main function of para_afh.
 204  *
 205  * \param argc Usual argument count.
 206  * \param argv Usual argument vector.
 207  *
 208  * \return \p EXIT_FAILURE or \p EXIT_SUCCESS.
 209  */
 210 int main(int argc, char **argv)
 211 {
 212         int i, ret = 0, audio_format_num, fd;
 213         void *audio_file_data;
 214         size_t audio_file_size;
 215         struct afh_info afhi;
 216         char *errctx;
 217
 218         ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
 219         if (ret < 0)
 220                 goto out;
 221         loglevel = OPT_UINT32_VAL(LOGLEVEL);
 222         version_handle_flag("afh", OPT_GIVEN(VERSION));
 223         handle_help_flags();
 224         for (i = 0; i < lls_num_inputs(lpr); i++) {
 225                 int ret2;
 226                 const char *path = lls_input(i, lpr);
 227                 ret = mmap_full_file(path, O_RDONLY, &audio_file_data,
 228                         &audio_file_size, &fd);
 229                 if (ret < 0) {
 230                         PARA_ERROR_LOG("failed to mmap \"%s\"\n", path);
 231                         goto out;
 232                 }
 233                 ret = compute_afhi(path, audio_file_data, audio_file_size,
 234                         fd, &afhi);
 235                 if (ret >= 0) {
 236                         audio_format_num = ret;
 237                         if (OPT_GIVEN(MODIFY)) {
 238                                 ret = rewrite_tags(path, fd, audio_file_data,
 239                                         audio_file_size, audio_format_num, &afhi);
 240                         } else {
 241                                 printf("File %d: %s\n", i + 1, path);
 242                                 print_info(audio_format_num, &afhi);
 243                                 if (OPT_GIVEN(CHUNK_TABLE))
 244                                         print_chunk_table(&afhi, audio_format_num,
 245                                                 audio_file_data, audio_file_size);
 246                         }
 247                         clear_afhi(&afhi);
 248                 }
 249                 close(fd);
 250                 ret2 = para_munmap(audio_file_data, audio_file_size);
 251                 if (ret2 < 0 && ret >= 0)
 252                         ret = ret2;
 253                 if (ret < 0)
 254                         break;
 255         }
 256 out:
 257         if (errctx)
 258                 PARA_ERROR_LOG("%s\n", errctx);
 259         if (ret < 0)
 260                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 261         lls_free_parse_result(lpr, CMD_PTR);
 262         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 263 }