{    int i;    len >>= 2;    for(i = 0;i < len; i++) {        if (((uint32_t *)sector)[i] != 0)            return 1;    }    return 0;}static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum){    int v, i;    if (n <= 0) {        *pnum = 0;        return 0;    }    v = is_not_zero(buf, 512);    for(i = 1; i < n; i++) {        buf += 512;        if (v != is_not_zero(buf, 512))            break;    }    *pnum = i;    return v;}#define IO_BUF_SIZE 65536static int img_convert(int argc, char **argv){    int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;    const char *fmt, *out_fmt, *out_filename;    BlockDriver *drv;    BlockDriverState **bs, *out_bs;    int64_t total_sectors, nb_sectors, sector_num, bs_offset;    uint64_t bs_sectors;    uint8_t buf[IO_BUF_SIZE];    const uint8_t *buf1;    BlockDriverInfo bdi;    fmt = NULL;    out_fmt = "raw";    flags = 0;    for(;;) {        c = getopt(argc, argv, "f:O:hce6");        if (c == -1)            break;        switch(c) {        case 'h':            help();            break;        case 'f':            fmt = optarg;            break;        case 'O':            out_fmt = optarg;            break;        case 'c':            flags |= BLOCK_FLAG_COMPRESS;            break;        case 'e':            flags |= BLOCK_FLAG_ENCRYPT;            break;        case '6':            flags |= BLOCK_FLAG_COMPAT6;            break;        }    }    bs_n = argc - optind - 1;    if (bs_n < 1) help();    out_filename = argv[argc - 1];            bs = calloc(bs_n, sizeof(BlockDriverState *));    if (!bs)        error("Out of memory");    total_sectors = 0;    for (bs_i = 0; bs_i < bs_n; bs_i++) {        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);        if (!bs[bs_i])            error("Could not open '%s'", argv[optind + bs_i]);        bdrv_get_geometry(bs[bs_i], &bs_sectors);        total_sectors += bs_sectors;    }    drv = bdrv_find_format(out_fmt);    if (!drv)        error("Unknown file format '%s'", out_fmt);    if (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_qcow && drv != &bdrv_qcow2)        error("Compression not supported for this file format");    if (flags & BLOCK_FLAG_ENCRYPT && drv != &bdrv_qcow && drv != &bdrv_qcow2)        error("Encryption not supported for this file format");    if (flags & BLOCK_FLAG_COMPAT6 && drv != &bdrv_vmdk)        error("Alternative compatibility level not supported for this file format");    if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)        error("Compression and encryption not supported at the same time");    ret = bdrv_create(drv, out_filename, total_sectors, NULL, flags);    if (ret < 0) {        if (ret == -ENOTSUP) {            error("Formatting not supported for file format '%s'", fmt);        } else {            error("Error while formatting '%s'", out_filename);        }    }    out_bs = bdrv_new_open(out_filename, out_fmt);    bs_i = 0;    bs_offset = 0;    bdrv_get_geometry(bs[0], &bs_sectors);    if (flags & BLOCK_FLAG_COMPRESS) {        if (bdrv_get_info(out_bs, &bdi) < 0)            error("could not get block driver info");        cluster_size = bdi.cluster_size;        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)            error("invalid cluster size");        cluster_sectors = cluster_size >> 9;        sector_num = 0;        for(;;) {            int64_t bs_num;            int remainder;            uint8_t *buf2;            nb_sectors = total_sectors - sector_num;            if (nb_sectors <= 0)                break;            if (nb_sectors >= cluster_sectors)                n = cluster_sectors;            else                n = nb_sectors;            bs_num = sector_num - bs_offset;            assert (bs_num >= 0);            remainder = n;            buf2 = buf;            while (remainder > 0) {                int nlow;                while (bs_num == bs_sectors) {                    bs_i++;                    assert (bs_i < bs_n);                    bs_offset += bs_sectors;                    bdrv_get_geometry(bs[bs_i], &bs_sectors);                    bs_num = 0;                    /* printf("changing part: sector_num=%lld, "                       "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",                       sector_num, bs_i, bs_offset, bs_sectors); */                }                assert (bs_num < bs_sectors);                nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;                if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)                     error("error while reading");                buf2 += nlow * 512;                bs_num += nlow;                remainder -= nlow;            }            assert (remainder == 0);            if (n < cluster_sectors)                memset(buf + n * 512, 0, cluster_size - n * 512);            if (is_not_zero(buf, cluster_size)) {                if (bdrv_write_compressed(out_bs, sector_num, buf,                                          cluster_sectors) != 0)                    error("error while compressing sector %" PRId64,                          sector_num);            }            sector_num += n;        }        /* signal EOF to align */        bdrv_write_compressed(out_bs, 0, NULL, 0);    } else {        sector_num = 0;        for(;;) {            nb_sectors = total_sectors - sector_num;            if (nb_sectors <= 0)                break;            if (nb_sectors >= (IO_BUF_SIZE / 512))                n = (IO_BUF_SIZE / 512);            else                n = nb_sectors;            while (sector_num - bs_offset >= bs_sectors) {                bs_i ++;                assert (bs_i < bs_n);                bs_offset += bs_sectors;                bdrv_get_geometry(bs[bs_i], &bs_sectors);                /* printf("changing part: sector_num=%lld, bs_i=%d, "                  "bs_offset=%lld, bs_sectors=%lld\n",                   sector_num, bs_i, bs_offset, bs_sectors); */            }            if (n > bs_offset + bs_sectors - sector_num)                n = bs_offset + bs_sectors - sector_num;            if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)                 error("error while reading");            /* NOTE: at the same time we convert, we do not write zero               sectors to have a chance to compress the image. Ideally, we               should add a specific call to have the info to go faster */            buf1 = buf;            while (n > 0) {                if (is_allocated_sectors(buf1, n, &n1)) {                    if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)                        error("error while writing");                }                sector_num += n1;                n -= n1;                buf1 += n1 * 512;            }        }    }    bdrv_delete(out_bs);    for (bs_i = 0; bs_i < bs_n; bs_i++)        bdrv_delete(bs[bs_i]);    free(bs);    return 0;}#ifdef _WIN32static int64_t get_allocated_file_size(const char *filename){    typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);    get_compressed_t get_compressed;    struct _stati64 st;    /* WinNT support GetCompressedFileSize to determine allocate size */    get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");    if (get_compressed) {    	DWORD high, low;    	low = get_compressed(filename, &high);    	if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)	    return (((int64_t) high) << 32) + low;    }    if (_stati64(filename, &st) < 0)        return -1;    return st.st_size;}#elsestatic int64_t get_allocated_file_size(const char *filename){    struct stat st;    if (stat(filename, &st) < 0)        return -1;    return (int64_t)st.st_blocks * 512;}#endifstatic void dump_snapshots(BlockDriverState *bs){    QEMUSnapshotInfo *sn_tab, *sn;    int nb_sns, i;    char buf[256];    nb_sns = bdrv_snapshot_list(bs, &sn_tab);    if (nb_sns <= 0)        return;    printf("Snapshot list:\n");    printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));    for(i = 0; i < nb_sns; i++) {        sn = &sn_tab[i];        printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));    }    qemu_free(sn_tab);}static int img_info(int argc, char **argv){    int c;    const char *filename, *fmt;    BlockDriver *drv;    BlockDriverState *bs;    char fmt_name[128], size_buf[128], dsize_buf[128];    uint64_t total_sectors;    int64_t allocated_size;    char backing_filename[1024];    char backing_filename2[1024];    BlockDriverInfo bdi;    fmt = NULL;    for(;;) {        c = getopt(argc, argv, "f:h");        if (c == -1)            break;        switch(c) {        case 'h':            help();            break;        case 'f':            fmt = optarg;            break;        }    }    if (optind >= argc)        help();    filename = argv[optind++];    bs = bdrv_new("");    if (!bs)        error("Not enough memory");    if (fmt) {        drv = bdrv_find_format(fmt);        if (!drv)            error("Unknown file format '%s'", fmt);    } else {        drv = NULL;    }    if (bdrv_open2(bs, filename, 0, drv) < 0) {        error("Could not open '%s'", filename);    }    bdrv_get_format(bs, fmt_name, sizeof(fmt_name));    bdrv_get_geometry(bs, &total_sectors);    get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);    allocated_size = get_allocated_file_size(filename);    if (allocated_size < 0)	sprintf(dsize_buf, "unavailable");    else        get_human_readable_size(dsize_buf, sizeof(dsize_buf),                                allocated_size);    printf("image: %s\n"           "file format: %s\n"           "virtual size: %s (%" PRId64 " bytes)\n"           "disk size: %s\n",           filename, fmt_name, size_buf,           (total_sectors * 512),           dsize_buf);    if (bdrv_is_encrypted(bs))        printf("encrypted: yes\n");    if (bdrv_get_info(bs, &bdi) >= 0) {        if (bdi.cluster_size != 0)            printf("cluster_size: %d\n", bdi.cluster_size);    }    bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));    if (backing_filename[0] != '\0') {        path_combine(backing_filename2, sizeof(backing_filename2),                     filename, backing_filename);        printf("backing file: %s (actual path: %s)\n",               backing_filename,               backing_filename2);    }    dump_snapshots(bs);    bdrv_delete(bs);    return 0;}int main(int argc, char **argv){    const char *cmd;    bdrv_init();    if (argc < 2)        help();    cmd = argv[1];    optind++;    if (!strcmp(cmd, "create")) {        img_create(argc, argv);    } else if (!strcmp(cmd, "commit")) {        img_commit(argc, argv);    } else if (!strcmp(cmd, "convert")) {        img_convert(argc, argv);    } else if (!strcmp(cmd, "info")) {        img_info(argc, argv);    } else {        help();    }    return 0;}