- uint8_t data[1];
- int ret = read_data(f, data, 1);
-
- if (ret > 0 && result)
- *result = data[0];
- return ret;
-}
-
-static bool atom_compare(int8_t a1, int8_t b1, int8_t c1, int8_t d1,
- int8_t a2, int8_t b2, int8_t c2, int8_t d2)
-{
- return a1 == a2 && b1 == b2 && c1 == c2 && d1 == d2;
-}
-
-enum atoms {
- /* atoms with subatoms */
- ATOM_MOOV = 1,
- ATOM_TRAK = 2,
- ATOM_MDIA = 4,
- ATOM_MINF = 5,
- ATOM_STBL = 6,
- ATOM_UDTA = 7,
- ATOM_ILST = 8, /* iTunes Metadata list */
- ATOM_TITLE = 9,
- ATOM_ARTIST = 10,
- ATOM_ALBUM = 12,
- ATOM_DATE = 13,
- ATOM_COMMENT = 15,
-
- SUBATOMIC = 128,
-
- /* atoms without subatoms */
- ATOM_MDHD = 134, /* track header */
- ATOM_STSD = 138, /* sample description box */
- ATOM_STTS = 139, /* time to sample box */
- ATOM_STSZ = 140, /* sample size box */
- ATOM_STCO = 142, /* chunk offset box */
- ATOM_STSC = 143, /* sample to chunk box */
- ATOM_MP4A = 144,
- ATOM_META = 148, /* iTunes Metadata box */
- ATOM_DATA = 150, /* iTunes Metadata data box */
- ATOM_UNKNOWN = 255
-};
-
-#define COPYRIGHT_SYMBOL ((int8_t)0xA9)
-
-static uint8_t atom_name_to_type(int8_t a, int8_t b, int8_t c, int8_t d)
-{
- if (a == 'm') {
- if (atom_compare(a, b, c, d, 'm', 'o', 'o', 'v'))
- return ATOM_MOOV;
- else if (atom_compare(a, b, c, d, 'm', 'i', 'n', 'f'))
- return ATOM_MINF;
- else if (atom_compare(a, b, c, d, 'm', 'd', 'i', 'a'))
- return ATOM_MDIA;
- else if (atom_compare(a, b, c, d, 'm', 'd', 'h', 'd'))
- return ATOM_MDHD;
- else if (atom_compare(a, b, c, d, 'm', 'p', '4', 'a'))
- return ATOM_MP4A;
- else if (atom_compare(a, b, c, d, 'm', 'e', 't', 'a'))
- return ATOM_META;
- } else if (a == 't') {
- if (atom_compare(a, b, c, d, 't', 'r', 'a', 'k'))
- return ATOM_TRAK;
- } else if (a == 's') {
- if (atom_compare(a, b, c, d, 's', 't', 'b', 'l'))
- return ATOM_STBL;
- else if (atom_compare(a, b, c, d, 's', 't', 's', 'd'))
- return ATOM_STSD;
- else if (atom_compare(a, b, c, d, 's', 't', 't', 's'))
- return ATOM_STTS;
- else if (atom_compare(a, b, c, d, 's', 't', 'c', 'o'))
- return ATOM_STCO;
- else if (atom_compare(a, b, c, d, 's', 't', 's', 'c'))
- return ATOM_STSC;
- else if (atom_compare(a, b, c, d, 's', 't', 's', 'z'))
- return ATOM_STSZ;
- } else if (a == COPYRIGHT_SYMBOL) {
- if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'n', 'a', 'm'))
- return ATOM_TITLE;
- else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'A', 'R', 'T'))
- return ATOM_ARTIST;
- else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'a', 'l', 'b'))
- return ATOM_ALBUM;
- else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'd', 'a', 'y'))
- return ATOM_DATE;
- else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'c', 'm', 't'))
- return ATOM_COMMENT;
- }
- if (atom_compare(a, b, c, d, 'u', 'd', 't', 'a'))
- return ATOM_UDTA;
- else if (atom_compare(a, b, c, d, 'i', 'l', 's', 't'))
- return ATOM_ILST;
- else if (atom_compare(a, b, c, d, 'd', 'a', 't', 'a'))
- return ATOM_DATA;
- else
- return ATOM_UNKNOWN;