CryptoPkg/Library/MbedTlsLib/CrtWrapper.c

/** @file
  C Run-Time Libraries (CRT) Wrapper Implementation for MbedTLS-based
  Cryptographic Library.

Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Base.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <stdio.h>

#include <Library/MemoryAllocationLib.h>

int
my_snprintf (
  char        *str,
  size_t      size,
  const char  *format,
  ...
  )
{
  return 0;
}

//
// Extra header to record the memory buffer size from malloc routine.
//
#define CRYPTMEM_HEAD_SIGNATURE  SIGNATURE_32('c','m','h','d')
typedef struct {
  UINT32    Signature;
  UINT32    Reserved;
  UINTN     Size;
} CRYPTMEM_HEAD;

#define CRYPTMEM_OVERHEAD  sizeof(CRYPTMEM_HEAD)

//
// -- Memory-Allocation Routines --
//

/* Allocates memory blocks */
void *
mbedtls_calloc (
  size_t  num,
  size_t  size
  )
{
  CRYPTMEM_HEAD  *PoolHdr;
  UINTN          NewSize;
  VOID           *Data;

  //
  // Adjust the size by the buffer header overhead
  //
  NewSize = (UINTN)(size * num) + CRYPTMEM_OVERHEAD;

  Data = AllocateZeroPool (NewSize);
  if (Data != NULL) {
    PoolHdr = (CRYPTMEM_HEAD *)Data;
    //
    // Record the memory brief information
    //
    PoolHdr->Signature = CRYPTMEM_HEAD_SIGNATURE;
    PoolHdr->Size      = size;

    return (VOID *)(PoolHdr + 1);
  } else {
    //
    // The buffer allocation failed.
    //
    return NULL;
  }
}

/* De-allocates or frees a memory block */
void
mbedtls_free (
  void  *ptr
  )
{
  CRYPTMEM_HEAD  *PoolHdr;

  //
  // In Standard C, free() handles a null pointer argument transparently. This
  // is not true of FreePool() below, so protect it.
  //
  if (ptr != NULL) {
    PoolHdr = (CRYPTMEM_HEAD *)ptr - 1;
    ASSERT (PoolHdr->Signature == CRYPTMEM_HEAD_SIGNATURE);
    FreePool (PoolHdr);
  }
}