sysapi/sysapi_util/ConcatSizedByteBuffer.c

//**********************************************************************;
// Copyright (c) 2015, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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#include <sapi/tpm20.h>
#include "sysapi_util.h"


//
// Concatenate two sized byte buffers from left to right.
//
// Inputs:
//
//      result -- pointer to TPM2B_MAX_BUFFER to hold result
//      addBuffer -- pointer to TPM2B buffer to be concatenated with result
//
// Outputs:
//
//      result contains the concatenation, if size permits
//      and it's size is updated accordingly.
//
//      If result isn't large enough, result doesn't change.
//
//      returned value is 0 for success, 1 for failure
//
TPM_RC ConcatSizedByteBuffer( TPM2B_MAX_BUFFER *result, TPM2B *addBuffer )
{
    int i;

    if( ( result->t.size + addBuffer->size ) > MAX_DIGEST_BUFFER )
        return TSS2_SYS_RC_BAD_VALUE;
    else
    {
        for( i = 0; i < addBuffer->size; i++ )
            result->t.buffer[i + result->t.size] = addBuffer->buffer[i];

        result->t.size += addBuffer->size;

        return TPM_RC_SUCCESS;
    }
}