/* SPDX-License-Identifier: BSD-2-Clause */
/***********************************************************************
 * Copyright (c) 2015 - 2017, Intel Corporation
 *
 * All rights reserved.
 ***********************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <inttypes.h>
#include <string.h>

#include "tss2_mu.h"

#include "util/tss2_endian.h"
#define LOGMODULE marshal
#include "util/log.h"

#define TPMA_MARSHAL(type) \
TSS2_RC Tss2_MU_##type##_Marshal(type src, uint8_t buffer[], \
                                 size_t buffer_size, size_t *offset) \
{ \
    size_t  local_offset = 0; \
\
    if (offset != NULL) { \
        LOG_TRACE("offset non-NULL, initial value: %zu", *offset); \
        local_offset = *offset; \
    } \
\
    if (buffer == NULL && offset == NULL) { \
        LOG_ERROR("buffer and offset parameter are NULL"); \
        return TSS2_MU_RC_BAD_REFERENCE; \
    } else if (buffer == NULL && offset != NULL) { \
        *offset += sizeof (src); \
        LOG_TRACE("buffer NULL and offset non-NULL, updating offset to %zu", \
             *offset); \
        return TSS2_RC_SUCCESS; \
    } else if (buffer_size < local_offset || \
               buffer_size - local_offset < sizeof (src)) \
    { \
        LOG_WARNING(\
             "buffer_size: %zu with offset: %zu are insufficient for object " \
             "of size %zu", \
             buffer_size, \
             local_offset, \
             sizeof (src)); \
        return TSS2_MU_RC_INSUFFICIENT_BUFFER; \
    } \
\
    LOG_DEBUG(\
         "Marshalling " #type " from 0x%" PRIxPTR " to buffer 0x%" PRIxPTR \
         " at index 0x%zx", \
         (uintptr_t)&src, \
         (uintptr_t)buffer, \
         local_offset); \
\
    switch (sizeof(src)) { \
        case 1: \
            break; \
        case 2: \
            src = HOST_TO_BE_16(src); \
            break; \
        case 4: \
            src = HOST_TO_BE_32(src); \
            break; \
        case 8: \
            src = HOST_TO_BE_64(src); \
            break; \
\
    } \
    memcpy (&buffer [local_offset], &src, sizeof(src)); \
    if (offset != NULL) { \
        *offset = local_offset + sizeof (src); \
        LOG_DEBUG("offset parameter non-NULL, updated to %zu", *offset); \
    } \
\
    return TSS2_RC_SUCCESS; \
}

#define TPMA_UNMARSHAL(type) \
TSS2_RC Tss2_MU_##type##_Unmarshal(uint8_t const buffer[], size_t buffer_size, \
                                   size_t *offset, type *dest) \
{ \
    size_t  local_offset = 0; \
    type tmp = {0};\
\
    if (offset != NULL) { \
        LOG_TRACE("offset non-NULL, initial value: %zu", *offset); \
        local_offset = *offset; \
    } \
\
    if (buffer == NULL || (dest == NULL && offset == NULL)) { \
        LOG_ERROR("buffer or dest and offset parameter are NULL"); \
        return TSS2_MU_RC_BAD_REFERENCE; \
    } else if (dest == NULL && offset != NULL) { \
        *offset += sizeof (type); \
        LOG_TRACE(\
             "buffer NULL and offset non-NULL, updating offset to %zu", \
             *offset); \
        return TSS2_RC_SUCCESS; \
    } else if (buffer_size < local_offset || \
               sizeof (*dest) > buffer_size - local_offset) \
    { \
        LOG_WARNING(\
             "buffer_size: %zu with offset: %zu are insufficient for object " \
             "of size %zu", \
             buffer_size, \
             local_offset, \
             sizeof (*dest)); \
        return TSS2_MU_RC_INSUFFICIENT_BUFFER; \
    } \
\
    LOG_DEBUG(\
         "Unmarshaling " #type " from 0x%" PRIxPTR " to buffer 0x%" PRIxPTR \
         " at index 0x%zx", \
         (uintptr_t)buffer, \
         (uintptr_t)dest, \
         local_offset); \
\
    memcpy (&tmp, &buffer [local_offset], sizeof (tmp)); \
\
    switch (sizeof(tmp)) { \
        case 1: \
            *dest = tmp; \
            break; \
        case 2: \
            *dest = BE_TO_HOST_16(tmp); \
            break; \
        case 4: \
            *dest = BE_TO_HOST_32(tmp); \
            break; \
        case 8: \
            *dest = BE_TO_HOST_64(tmp); \
            break; \
\
    } \
\
    if (offset != NULL) { \
        *offset = local_offset + sizeof (*dest); \
        LOG_DEBUG("offset parameter non-NULL, updated to %zu", *offset); \
    } \
    return TSS2_RC_SUCCESS; \
}

/*
 * These macros expand to (un)marshal functions for each of the TPMA types
 * the specification part 2.
 */
TPMA_MARSHAL  (TPMA_ALGORITHM);
TPMA_UNMARSHAL(TPMA_ALGORITHM);
TPMA_MARSHAL  (TPMA_CC);
TPMA_UNMARSHAL(TPMA_CC);
TPMA_MARSHAL  (TPMA_LOCALITY);
TPMA_UNMARSHAL(TPMA_LOCALITY);
TPMA_MARSHAL  (TPMA_NV);
TPMA_UNMARSHAL(TPMA_NV);
TPMA_MARSHAL  (TPMA_OBJECT);
TPMA_UNMARSHAL(TPMA_OBJECT);
TPMA_MARSHAL  (TPMA_PERMANENT);
TPMA_UNMARSHAL(TPMA_PERMANENT);
TPMA_MARSHAL  (TPMA_SESSION);
TPMA_UNMARSHAL(TPMA_SESSION);
TPMA_MARSHAL  (TPMA_STARTUP_CLEAR);
TPMA_UNMARSHAL(TPMA_STARTUP_CLEAR);