// This file was extracted from the TCG Published

// Trusted Platform Module Library

// Part 3: Commands

// Family "2.0"

// Level 00 Revision 01.16

// October 30, 2014

#include "InternalRoutines.h"

#include "NV_Read_fp.h"

#include "NV_spt_fp.h"

//

//

//     Error Returns                     Meaning

//

//     TPM_RC_NV_AUTHORIZATION           the authorization was valid but the authorizing entity (authHandle) is

//                                       not allowed to read from the Index referenced by nvIndex

//     TPM_RC_NV_LOCKED                  the Index referenced by nvIndex is read locked

//     TPM_RC_NV_RANGE                   read range defined by size and offset is outside the range of the

//                                       Index referenced by nvIndex

//     TPM_RC_NV_UNINITIALIZED           the Index referenced by nvIndex has not been initialized (written)

//

TPM_RC

TPM2_NV_Read(

   NV_Read_In        *in,                 // IN: input parameter list

   NV_Read_Out       *out                 // OUT: output parameter list

   )

{

   NV_INDEX          nvIndex;

   TPM_RC            result;

// Input Validation

   // Get NV index info

   NvGetIndexInfo(in->nvIndex, &nvIndex);

   // Common read access checks. NvReadAccessChecks() returns

   // TPM_RC_NV_AUTHORIZATION, TPM_RC_NV_LOCKED, or TPM_RC_NV_UNINITIALIZED

   // error may be returned at this point

   result = NvReadAccessChecks(in->authHandle, in->nvIndex);

   if(result != TPM_RC_SUCCESS)

       return result;

    // Make sure the data will fit the return buffer

    if( in->size > MAX_NV_BUFFER_SIZE)

        return TPM_RC_VALUE + RC_NV_Read_size;

    // Verify that the offset is not too large

    if(in->offset > nvIndex.publicArea.dataSize)

        return TPM_RC_VALUE + RC_NV_Read_offset;

    // Make sure that the selection is within the range of the Index

    if(in->size > (nvIndex.publicArea.dataSize - in->offset))

        return TPM_RC_NV_RANGE;

// Command Output

   // Set the return size

   out->data.t.size = in->size;

   // Perform the read

   NvGetIndexData(in->nvIndex, &nvIndex, in->offset, in->size, out->data.t.buffer);

   return TPM_RC_SUCCESS;

}