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/** @file
Base Memory Allocation Routines Wrapper for Crypto library over OpenSSL
during PEI & DXE phases.
Copyright (c) 2024, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <CrtLibSupport.h>
#include <Library/MemoryAllocationLib.h>
//
// 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 *
malloc (
size_t size
)
{
CRYPTMEM_HEAD *PoolHdr;
UINTN NewSize;
VOID *Data;
//
// Adjust the size by the buffer header overhead
//
NewSize = (UINTN)(size) + CRYPTMEM_OVERHEAD;
Data = AllocatePool (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;
}
}
/* Reallocate memory blocks */
void *
realloc (
void *ptr,
size_t size
)
{
CRYPTMEM_HEAD *OldPoolHdr;
CRYPTMEM_HEAD *NewPoolHdr;
UINTN OldSize;
UINTN NewSize;
VOID *Data;
NewSize = (UINTN)size + CRYPTMEM_OVERHEAD;
Data = AllocatePool (NewSize);
if (Data != NULL) {
NewPoolHdr = (CRYPTMEM_HEAD *)Data;
NewPoolHdr->Signature = CRYPTMEM_HEAD_SIGNATURE;
NewPoolHdr->Size = size;
if (ptr != NULL) {
//
// Retrieve the original size from the buffer header.
//
OldPoolHdr = (CRYPTMEM_HEAD *)ptr - 1;
ASSERT (OldPoolHdr->Signature == CRYPTMEM_HEAD_SIGNATURE);
OldSize = OldPoolHdr->Size;
//
// Duplicate the buffer content.
//
CopyMem ((VOID *)(NewPoolHdr + 1), ptr, MIN (OldSize, size));
FreePool ((VOID *)OldPoolHdr);
}
return (VOID *)(NewPoolHdr + 1);
} else {
//
// The buffer allocation failed.
//
return NULL;
}
}
/* De-allocates or frees a memory block */
void
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);
}
}
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