gistfile1.cpp

ssize_t
DVDDiskNode::ReadAt(off_t pos, void *buffer, size_t size)
{
    printf("DVD::ReadAt(%i, %lu)\n", (int)pos, (unsigned long)size);

    int blockCount = ceil(size / DVD_VIDEO_LB_LEN);

    uint8_t *buf = (uint8_t *) buffer;
    buf = new uint8_t[blockCount * DVD_VIDEO_LB_LEN];

    for (int i = 0; i < blockCount; i++) {
        fResult = dvdnav_get_next_block(fDVDNav, buf + i * DVD_VIDEO_LB_LEN, &fEvent, &fLen);

        if (fResult == DVDNAV_STATUS_ERR) {
            printf("DVD: Error getting next block: %s\n", dvdnav_err_to_string(fDVDNav));
            return B_ERROR;
        }

        while (fEvent != DVDNAV_BLOCK_OK) {
            fResult = dvdnav_get_next_block(fDVDNav, buf + i * DVD_VIDEO_LB_LEN, &fEvent, &fLen);

            if (fResult == DVDNAV_STATUS_ERR) {
                printf("DVD: Error getting next block: %s\n", dvdnav_err_to_string(fDVDNav));
                return B_ERROR;
            }
        }
    }
    
    return blockCount * DVD_VIDEO_LB_LEN;
}