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/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "bh_platform.h"
#include "app_manager_host.h"
#include "app_manager.h"
#include "app_manager_export.h"
#include "coap_ext.h"
/* host communication interface */
static host_interface host_commu;
/* IMRTLink Two leading bytes */
static unsigned char leadings[] = { (unsigned char)0x12, (unsigned char)0x34 };
/* IMRTLink Receiving Phase */
typedef enum recv_phase_t {
Phase_Non_Start,
Phase_Leading,
Phase_Type,
Phase_Size,
Phase_Payload,
Phase_Ignoring
} recv_phase_t;
/* IMRTLink Receive Context */
typedef struct recv_context_t {
recv_phase_t phase;
bh_link_msg_t message;
int size_in_phase;
} recv_context_t;
/* Current IMRTLink receive context */
static recv_context_t recv_ctx;
/* Lock for device write */
static korp_mutex host_lock;
static bool enable_log = false;
static bool
is_little_endian()
{
long i = 0x01020304;
unsigned char *c = (unsigned char *)&i;
return (*c == 0x04) ? true : false;
}
static void
exchange32(uint8 *pData)
{
uint8 value = *pData;
*pData = *(pData + 3);
*(pData + 3) = value;
value = *(pData + 1);
*(pData + 1) = *(pData + 2);
*(pData + 2) = value;
}
/* return:
* 1: complete message received
* 0: incomplete message received
*/
static int
on_imrt_link_byte_arrive(unsigned char ch, recv_context_t *ctx)
{
if (ctx->phase == Phase_Non_Start) {
ctx->message.payload_size = 0;
if (ctx->message.payload) {
APP_MGR_FREE(ctx->message.payload);
ctx->message.payload = NULL;
}
if (ch == leadings[0]) {
if (enable_log)
app_manager_printf("##On byte arrive: got leading 0\n");
ctx->phase = Phase_Leading;
}
return 0;
}
else if (ctx->phase == Phase_Leading) {
if (ch == leadings[1]) {
if (enable_log)
app_manager_printf("##On byte arrive: got leading 1\n");
ctx->phase = Phase_Type;
}
else
ctx->phase = Phase_Non_Start;
return 0;
}
else if (ctx->phase == Phase_Type) {
if (ctx->size_in_phase++ == 0) {
if (enable_log)
app_manager_printf("##On byte arrive: got type 0\n");
ctx->message.message_type = ch;
}
else {
if (enable_log)
app_manager_printf("##On byte arrive: got type 1\n");
ctx->message.message_type |= (ch << 8);
ctx->message.message_type = ntohs(ctx->message.message_type);
ctx->phase = Phase_Size;
ctx->size_in_phase = 0;
}
return 0;
}
else if (ctx->phase == Phase_Size) {
unsigned char *p = (unsigned char *)&ctx->message.payload_size;
if (enable_log)
app_manager_printf("##On byte arrive: got payload_size, byte %d\n",
ctx->size_in_phase);
p[ctx->size_in_phase++] = ch;
if (ctx->size_in_phase == sizeof(ctx->message.payload_size)) {
ctx->message.payload_size = ntohl(ctx->message.payload_size);
ctx->phase = Phase_Payload;
if (enable_log)
app_manager_printf("##On byte arrive: payload_size: %d\n",
ctx->message.payload_size);
if (ctx->message.payload) {
APP_MGR_FREE(ctx->message.payload);
ctx->message.payload = NULL;
}
/* message completion */
if (ctx->message.payload_size == 0) {
ctx->phase = Phase_Non_Start;
if (enable_log)
app_manager_printf("##On byte arrive: receive end, "
"payload_size is 0.\n");
return 1;
}
if (ctx->message.message_type != INSTALL_WASM_APP) {
ctx->message.payload =
(char *)APP_MGR_MALLOC(ctx->message.payload_size);
if (!ctx->message.payload) {
ctx->phase = Phase_Non_Start;
return 0;
}
}
ctx->phase = Phase_Payload;
ctx->size_in_phase = 0;
}
return 0;
}
else if (ctx->phase == Phase_Payload) {
if (ctx->message.message_type == INSTALL_WASM_APP) {
int received_size;
module_on_install_request_byte_arrive_func module_on_install =
g_module_interfaces[Module_WASM_App]->module_on_install;
ctx->size_in_phase++;
if (module_on_install != NULL) {
if (module_on_install(ch, ctx->message.payload_size,
&received_size)) {
if (received_size == ctx->message.payload_size) {
/* whole wasm app received */
ctx->phase = Phase_Non_Start;
return 1;
}
}
else {
/* receive or handle fail */
if (ctx->size_in_phase < ctx->message.payload_size) {
ctx->phase = Phase_Ignoring;
}
else {
ctx->phase = Phase_Non_Start;
ctx->size_in_phase = 0;
}
return 0;
}
}
else {
ctx->phase = Phase_Non_Start;
ctx->size_in_phase = 0;
return 0;
}
}
else {
ctx->message.payload[ctx->size_in_phase++] = ch;
if (ctx->size_in_phase == ctx->message.payload_size) {
ctx->phase = Phase_Non_Start;
if (enable_log)
app_manager_printf("##On byte arrive: receive end, "
"payload_size is %d.\n",
ctx->message.payload_size);
return 1;
}
return 0;
}
}
else if (ctx->phase == Phase_Ignoring) {
ctx->size_in_phase++;
if (ctx->size_in_phase == ctx->message.payload_size) {
if (ctx->message.payload)
APP_MGR_FREE(ctx->message.payload);
memset(ctx, 0, sizeof(*ctx));
return 0;
}
}
return 0;
}
int
aee_host_msg_callback(void *msg, uint32_t msg_len)
{
unsigned char *p = msg, *p_end = p + msg_len;
/*app_manager_printf("App Manager receive %d bytes from Host\n", msg_len);*/
for (; p < p_end; p++) {
int ret = on_imrt_link_byte_arrive(*p, &recv_ctx);
if (ret == 1) {
if (recv_ctx.message.payload) {
int msg_type = recv_ctx.message.message_type;
if (msg_type == REQUEST_PACKET) {
request_t request;
memset(&request, 0, sizeof(request));
if (!unpack_request(recv_ctx.message.payload,
recv_ctx.message.payload_size,
&request))
continue;
request.sender = ID_HOST;
am_dispatch_request(&request);
}
else {
app_manager_printf("unexpected host msg type: %d\n",
msg_type);
}
APP_MGR_FREE(recv_ctx.message.payload);
recv_ctx.message.payload = NULL;
recv_ctx.message.payload_size = 0;
}
memset(&recv_ctx, 0, sizeof(recv_ctx));
}
}
return 0;
}
bool
app_manager_host_init(host_interface *interface)
{
if (os_mutex_init(&host_lock) != 0) {
return false;
}
memset(&recv_ctx, 0, sizeof(recv_ctx));
host_commu.init = interface->init;
host_commu.send = interface->send;
host_commu.destroy = interface->destroy;
if (host_commu.init != NULL) {
if (!host_commu.init()) {
os_mutex_destroy(&host_lock);
return false;
}
}
return true;
}
int
app_manager_host_send_msg(int msg_type, const char *buf, int size)
{
/* send an IMRT LINK message contains the buf as payload */
if (host_commu.send != NULL) {
int size_s = size, n;
char header[16];
os_mutex_lock(&host_lock);
/* leading bytes */
bh_memcpy_s(header, 2, leadings, 2);
/* message type */
/* TODO: check if use network byte order!!! */
*((uint16 *)(header + 2)) = htons(msg_type);
/* payload length */
if (is_little_endian())
exchange32((uint8 *)&size_s);
bh_memcpy_s(header + 4, 4, &size_s, 4);
n = host_commu.send(NULL, header, 8);
if (n != 8) {
os_mutex_unlock(&host_lock);
return 0;
}
/* payload */
n = host_commu.send(NULL, buf, size);
os_mutex_unlock(&host_lock);
app_manager_printf("sent %d bytes to host\n", n);
return n;
}
else {
app_manager_printf("no send api provided\n");
}
return 0;
}
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