Merge "fastboot: windows: fix Read function"

ssize_t WindowsUsbTransport::Read(void* data, size_t len) {

    unsigned long time_out = 0;

    unsigned long read = 0;

    size_t count = 0;

    int ret;

    DBG("usb_read %zu\n", len);

    if (nullptr != handle_) {

        while (1) {

            int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;

        while (len > 0) {

            size_t xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;

            ret = AdbReadEndpointSync(handle_->adb_read_pipe, data, xfer, &read, time_out);

            errno = GetLastError();

            DBG("usb_read got: %ld, expected: %d, errno: %d\n", read, xfer, errno);

            if (ret) {

                return read;

            } else {

            if (ret == 0) {

                // assume ERROR_INVALID_HANDLE indicates we are disconnected

                if (errno == ERROR_INVALID_HANDLE)

                    usb_kick(handle_.get());

                break;

            }

            // else we timed out - try again

            count += read;

            len -= read;

            data = (char*)data + read;

            if (xfer != read || len == 0) return count;

        }

    } else {

        DBG("usb_read NULL handle\n");