psa_ps_set_extended()

psa_status_t psa_ps_set_extended	(	psa_storage_uid_t	uid,
		size_t	data_offset,
		size_t	data_length,
		const void *	p_data
	)

#include <include/protected_storage.h>

Sets partial data into an asset.

Before calling this function, the storage must have been reserved with a call to psa_ps_create. It can also be used to overwrite data in an asset that was created with a call to psa_ps_set. Calling this function with data_length = 0 is permitted, which will make no change to the stored data.This function can overwrite existing data and/or extend it up to the capacity for the uid specified in psa_ps_create, but cannot create gaps.

That is, it has preconditions:

• data_offset <= size
• data_offset + data_length <= capacity and postconditions:
• size = max(size, data_offset + data_length)
• capacity unchanged.

Parameters

[in]	uid	The uid value
[in]	data_offset	Offset within the asset to start the write
[in]	data_length	The size in bytes of the data in p_data to write
[in]	p_data	Pointer to a buffer which contains the data to write

Returns

A status indicating the success/failure of the operation

Return values

PSA_SUCCESS	The asset exists, the input parameters are correct and the data is correctly written in the physical storage.
PSA_ERROR_STORAGE_FAILURE	The data was not written correctly in the physical storage
PSA_ERROR_INVALID_ARGUMENT	The operation failed because one or more of the preconditions listed above regarding data_offset, size, or data_length was violated.
PSA_ERROR_DOES_NOT_EXIST	The specified uid was not found
PSA_ERROR_NOT_SUPPORTED	The implementation of the API does not support this function
PSA_ERROR_GENERIC_ERROR	The operation failed due to an unspecified error
PSA_ERROR_DATA_CORRUPT	The operation failed because the existing data has been corrupted.
PSA_ERROR_INVALID_SIGNATURE	The operation failed because the existing data failed authentication (MAC check failed).
PSA_ERROR_NOT_PERMITTED	The operation failed because it was attempted on an asset which was written with the flag PSA_STORAGE_FLAG_WRITE_ONCE