static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    int entries, i, j;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_rb32(pb); // version + flags
    entries = avio_rb32(pb);
    if (!entries ||
        entries >  (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||
        entries >= UINT_MAX / sizeof(*sc->drefs))
        return AVERROR_INVALIDDATA;

    for (i = 0; i < sc->drefs_count; i++) {
        MOVDref *dref = &sc->drefs[i];
        av_freep(&dref->path);
        av_freep(&dref->dir);
    }
    av_free(sc->drefs);
    sc->drefs_count = 0;
    sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
    if (!sc->drefs)
        return AVERROR(ENOMEM);
    sc->drefs_count = entries;

    for (i = 0; i < entries; i++) {
        MOVDref *dref = &sc->drefs[i];
        uint32_t size = avio_rb32(pb);
        int64_t next = avio_tell(pb);

        if (size < 12 || next < 0 || next > INT64_MAX - size)
            return AVERROR_INVALIDDATA;

        next += size - 4;

        dref->type = avio_rl32(pb);
        avio_rb32(pb); // version + flags

        if (dref->type == MKTAG('a','l','i','s') && size > 150) {
            /* macintosh alias record */
            uint16_t volume_len, len;
            int16_t type;
            int ret;

            avio_skip(pb, 10);

            volume_len = avio_r8(pb);
            volume_len = FFMIN(volume_len, 27);
            ret = ffio_read_size(pb, dref->volume, 27);
            if (ret < 0)
                return ret;
            dref->volume[volume_len] = 0;
            av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);

            avio_skip(pb, 12);

            len = avio_r8(pb);
            len = FFMIN(len, 63);
            ret = ffio_read_size(pb, dref->filename, 63);
            if (ret < 0)
                return ret;
            dref->filename[len] = 0;
            av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);

            avio_skip(pb, 16);

            /* read next level up_from_alias/down_to_target */
            dref->nlvl_from = avio_rb16(pb);
            dref->nlvl_to   = avio_rb16(pb);
            av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
                   dref->nlvl_from, dref->nlvl_to);

            avio_skip(pb, 16);

            for (type = 0; type != -1 && avio_tell(pb) < next; ) {
                if (avio_feof(pb))
                    return AVERROR_EOF;
                type = avio_rb16(pb);
                len = avio_rb16(pb);
                av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
                if (len&1)
                    len += 1;
                if (type == 2) { // absolute path
                    av_free(dref->path);
                    dref->path = av_mallocz(len+1);
                    if (!dref->path)
                        return AVERROR(ENOMEM);

                    ret = ffio_read_size(pb, dref->path, len);
                    if (ret < 0) {
                        av_freep(&dref->path);
                        return ret;
                    }
                    if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
                        len -= volume_len;
                        memmove(dref->path, dref->path+volume_len, len);
                        dref->path[len] = 0;
                    }
                    // trim string of any ending zeros
                    for (j = len - 1; j >= 0; j--) {
                        if (dref->path[j] == 0)
                            len--;
                        else
                            break;
                    }
                    for (j = 0; j < len; j++)
                        if (dref->path[j] == ':' || dref->path[j] == 0)
                            dref->path[j] = '/';
                    av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
                } else if (type == 0) { // directory name
                    av_free(dref->dir);
                    dref->dir = av_malloc(len+1);
                    if (!dref->dir)
                        return AVERROR(ENOMEM);

                    ret = ffio_read_size(pb, dref->dir, len);
                    if (ret < 0) {
                        av_freep(&dref->dir);
                        return ret;
                    }
                    dref->dir[len] = 0;
                    for (j = 0; j < len; j++)
                        if (dref->dir[j] == ':')
                            dref->dir[j] = '/';
                    av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
                } else
                    avio_skip(pb, len);
            }
        } else {
            av_log(c->fc, AV_LOG_DEBUG, "Unknown dref type 0x%08"PRIx32" size %"PRIu32"\n",
                   dref->type, size);
            entries--;
            i--;
        }
        avio_seek(pb, next, SEEK_SET);
    }
    return 0;
}