mp4: Simplify atom_read_header().

[paraslash.git] / aac_afh.c

diff --git a/aac_afh.c b/aac_afh.c
index f3a06c4c213c80fad95158d8c33b18fafa43e33a..b6c90d59009a3315f9249e5e3b200429132d6296 100644 (file)
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -41,11 +41,19 @@ static ssize_t aac_afh_read_cb(void *user_data, void *dest, size_t want)
        return rv;
 }
 
-static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
+static off_t aac_afh_seek_cb(void *user_data, off_t offset, int whence)
 {
        struct aac_afh_context *c = user_data;
-       c->fpos = pos;
-       return 0;
+
+       if (whence == SEEK_SET)
+               c->fpos = offset;
+       else if (whence == SEEK_CUR)
+               c->fpos += offset;
+       else if (whence == SEEK_END)
+               c->fpos = c->mapsize + offset;
+       else
+               assert(false);
+       return c->fpos;
 }
 
 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
@@ -167,16 +175,19 @@ static ssize_t aac_afh_meta_read_cb(void *user_data, void *dest, size_t want)
        return read(fd, dest, want);
 }
 
-static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
+static off_t aac_afh_meta_seek_cb(void *user_data, off_t offset, int whence)
 {
        int fd = *(int *)user_data;
-       return lseek(fd, pos, SEEK_SET);
+       off_t ret = lseek(fd, offset, whence);
+
+       assert(ret != (off_t)-1);
+       return ret;
 }
 
-static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
+static ssize_t aac_afh_meta_write_cb(void *user_data, void *dest, size_t count)
 {
        int fd = *(int *)user_data;
-       return write(fd, dest, want);
+       return write(fd, dest, count);
 }
 
 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
@@ -238,11 +249,7 @@ static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
        replace_or_add_tag("album", tags->album, metadata);
        replace_or_add_tag("date", tags->year, metadata);
        replace_or_add_tag("comment", tags->comment, metadata);
-       ret = -E_MP4_META_WRITE;
-       if (!mp4_meta_update(mp4))
-               goto close;
-       ret = 1;
-close:
+       ret = mp4_meta_update(mp4);
        mp4_close(mp4);
        return ret;
 }