libpldm/firmware_update.c

#include "firmware_update.h"
#include <endian.h>

int encode_query_device_identifiers_req(uint8_t instance_id,
					size_t payload_length,
					struct pldm_msg *msg)
{
	if (msg == NULL) {
		return PLDM_ERROR_INVALID_DATA;
	}

	if (payload_length != PLDM_QUERY_DEVICE_IDENTIFIERS_REQ_BYTES) {
		return PLDM_ERROR_INVALID_LENGTH;
	}

	return encode_pldm_header_only(PLDM_REQUEST, instance_id, PLDM_FWUP,
				       PLDM_QUERY_DEVICE_IDENTIFIERS, msg);
}

int decode_query_device_identifiers_resp(const struct pldm_msg *msg,
					 size_t payload_length,
					 uint8_t *completion_code,
					 uint32_t *device_identifiers_len,
					 uint8_t *descriptor_count,
					 uint8_t **descriptor_data)
{
	if (msg == NULL || completion_code == NULL ||
	    device_identifiers_len == NULL || descriptor_count == NULL ||
	    descriptor_data == NULL) {
		return PLDM_ERROR_INVALID_DATA;
	}

	*completion_code = msg->payload[0];
	if (PLDM_SUCCESS != *completion_code) {
		return PLDM_SUCCESS;
	}

	if (payload_length <
	    sizeof(struct pldm_query_device_identifiers_resp)) {
		return PLDM_ERROR_INVALID_LENGTH;
	}

	struct pldm_query_device_identifiers_resp *response =
	    (struct pldm_query_device_identifiers_resp *)msg->payload;
	*device_identifiers_len = le32toh(response->device_identifiers_len);

	if (*device_identifiers_len < PLDM_FWUP_DEVICE_DESCRIPTOR_MIN_LEN) {
		return PLDM_ERROR_INVALID_LENGTH;
	}

	if (payload_length !=
	    sizeof(struct pldm_query_device_identifiers_resp) +
		*device_identifiers_len) {
		return PLDM_ERROR_INVALID_LENGTH;
	}
	*descriptor_count = response->descriptor_count;

	if (*descriptor_count == 0) {
		return PLDM_ERROR_INVALID_DATA;
	}

	*descriptor_data =
	    (uint8_t *)(msg->payload +
			sizeof(struct pldm_query_device_identifiers_resp));
	return PLDM_SUCCESS;
}