null_device.cpp File Reference

Functions
static bool	nd_is_inserted (void *)
static bool	nd_is_protected (void *)
static bool	nd_return_success (void *)
static bool	nd_return_success_read (void *, uint32_t, uint8_t *buffer, uint32_t n)
static bool	nd_return_success_write (void *, uint32_t, const uint8_t *, uint32_t)
static bool	nd_get_info (void *, BlockDeviceInfo *bdip)

Variables
static const struct BaseBlockDeviceVMT	ndVmt
NullDevice	ND1 = { &ndVmt, BLK_READY }

Function Documentation

nd_get_info()

static bool nd_get_info ( void *  , BlockDeviceInfo *  bdip  )

static

Definition at line 44 of file null_device.cpp.

                                                      {
    // We have to report non-zero size here because Windows
    // will query the size of the block device even if we indicate
    // that the device has no media
    // If we report zeroes, it breaks USB until you unplug this device
    bdip->blk_num = 1000;
    bdip->blk_size = 512;
    return HAL_SUCCESS;
}

nd_is_inserted()

static bool nd_is_inserted ( void *  )

static

Definition at line 20 of file null_device.cpp.

                                  {
    // This function is the whole point - we have no media!
    return false;
}

nd_is_protected()

static bool nd_is_protected ( void *  )

static

Definition at line 25 of file null_device.cpp.

                                   {
    return false;
}

nd_return_success()

static bool nd_return_success ( void *  )

static

Definition at line 29 of file null_device.cpp.

                                     {
    return HAL_SUCCESS;
}

nd_return_success_read()

static bool nd_return_success_read ( void *  , uint32_t  , uint8_t *  buffer, uint32_t  n  )

static

Definition at line 33 of file null_device.cpp.

                                                                                 {
    // write zeroes to the buffer to prevent somebody reading random memory
    memset(buffer, 0, n);
 
    return HAL_SUCCESS;
}

nd_return_success_write()

static bool nd_return_success_write ( void *  , uint32_t  , const uint8_t *  , uint32_t    )

static

Definition at line 40 of file null_device.cpp.

                                                                               {
    return HAL_SUCCESS;
}

Variable Documentation

ND1

NullDevice ND1 = { &ndVmt, BLK_READY }

Definition at line 69 of file null_device.cpp.

{ &ndVmt, BLK_READY };

Referenced by deattachMsdSdCard(), getRamdiskDevice(), and initUsbMsd().

ndVmt

const struct BaseBlockDeviceVMT ndVmt

static

Initial value:

= {
    (size_t)0, 
    nd_is_inserted,
    nd_is_protected,
 
    
    nd_return_success,
    nd_return_success,
    nd_return_success_read,
    nd_return_success_write,
    nd_return_success,
    nd_get_info
}

Definition at line 54 of file null_device.cpp.

                                               {
    (size_t)0, // instanceOffset
    nd_is_inserted,
    nd_is_protected,
 
    // These functions just claim success to make the host happy
    nd_return_success,
    nd_return_success,
    nd_return_success_read,
    nd_return_success_write,
    nd_return_success,
    nd_get_info
};

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