Merge \"Better diagnostics from \"adb sideload\".\"

 *   we hang up.

 */

static int adb_sideload_host(const char* fn) {

    printf("loading: '%s'", fn);

    fflush(stdout);

    fprintf(stderr, "loading: '%s'...\n", fn);

    std::string content;

    if (!android::base::ReadFileToString(fn, &content)) {

        printf("\n");

        fprintf(stderr, "* cannot read '%s' *\n", fn);

        fprintf(stderr, "failed: %s\n", strerror(errno));

        return -1;

    }

    const uint8_t* data = reinterpret_cast<const uint8_t*>(content.data());

    unsigned sz = content.size();

    fprintf(stderr, "connecting...\n");

    std::string service =

            android::base::StringPrintf("sideload-host:%d:%d", sz, SIDELOAD_HOST_BLOCK_SIZE);

    std::string error;

    if (fd < 0) {

        // Try falling back to the older sideload method.  Maybe this

        // is an older device that doesn't support sideload-host.

        printf("\n");

        fprintf(stderr, "falling back to older sideload method...\n");

        return adb_download_buffer("sideload", fn, data, sz, true);

    }