RetroArch/network/netplay/netplay_room_parse.c

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2017-03-04 06:31:24 +00:00
/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
* Copyright (C) 2016-2017 - Gregor Richards
* Copyright (C) 2017 - Brad Parker
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <string/stdstring.h>
#include <compat/strl.h>
#include <formats/jsonsax_full.h>
#include "netplay_discovery.h"
#include "../../verbosity.h"
enum parse_state
{
STATE_START = 0,
STATE_ARRAY_START,
STATE_OBJECT_START,
STATE_FIELDS_START,
STATE_FIELDS_OBJECT_START,
STATE_END
};
struct netplay_rooms
{
struct netplay_room *head;
struct netplay_room *cur;
};
typedef struct tag_Context
{
JSON_Parser parser;
enum parse_state state;
char *cur_field;
void *cur_member;
size_t cur_member_size;
} Context;
static struct netplay_rooms *rooms;
static void parse_context_init(Context* pCtx)
{
pCtx->parser = NULL;
}
static void parse_context_free(Context* pCtx)
{
if (pCtx->cur_field)
free(pCtx->cur_field);
pCtx->cur_field = NULL;
JSON_Parser_Free(pCtx->parser);
}
static JSON_Parser_HandlerResult JSON_CALL EncodingDetectedHandler(JSON_Parser parser)
{
(void)parser;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL NullHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL BooleanHandler(JSON_Parser parser, JSON_Boolean value)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
if (pCtx->state == STATE_FIELDS_OBJECT_START)
if (pCtx->cur_field)
*((bool*)pCtx->cur_member) = value;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL StringHandler(JSON_Parser parser, char* pValue, size_t length, JSON_StringAttributes attributes)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
(void)attributes;
if (pCtx->state == STATE_FIELDS_OBJECT_START)
{
if (pValue && length)
{
if (pCtx->cur_field && string_is_equal(pCtx->cur_field, "game_crc"))
{
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/* CRC comes in as a string but it is stored as an unsigned casted to int */
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*((int*)pCtx->cur_member) = strtoul(pValue, NULL, 16);
}
else if (pCtx->cur_field)
strlcpy((char*)pCtx->cur_member, pValue, PATH_MAX_LENGTH);
}
}
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL NumberHandler(JSON_Parser parser, char* pValue, size_t length, JSON_NumberAttributes attributes)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
(void)attributes;
if (pCtx->state == STATE_FIELDS_OBJECT_START)
{
if (pValue && length)
if (pCtx->cur_field)
*((int*)pCtx->cur_member) = strtol(pValue, NULL, 10);
}
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL SpecialNumberHandler(JSON_Parser parser, JSON_SpecialNumber value)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL StartObjectHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
if (pCtx->state == STATE_FIELDS_START)
{
pCtx->state = STATE_FIELDS_OBJECT_START;
if (!rooms->head)
{
rooms->head = (struct netplay_room*)calloc(1, sizeof(*rooms->head));
rooms->cur = rooms->head;
}
else if (!rooms->cur->next)
{
rooms->cur->next = (struct netplay_room*)calloc(1, sizeof(*rooms->cur->next));
rooms->cur = rooms->cur->next;
}
}
else if (pCtx->state == STATE_ARRAY_START)
pCtx->state = STATE_OBJECT_START;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL EndObjectHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
if (pCtx->state == STATE_FIELDS_OBJECT_START)
pCtx->state = STATE_ARRAY_START;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL ObjectMemberHandler(JSON_Parser parser, char* pValue, size_t length, JSON_StringAttributes attributes)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
(void)attributes;
if (!pValue || !length)
return JSON_Parser_Continue;
if (pCtx->state == STATE_OBJECT_START && string_is_equal(pValue, "fields"))
pCtx->state = STATE_FIELDS_START;
if (pCtx->state == STATE_FIELDS_OBJECT_START)
{
if (pCtx->cur_field)
free(pCtx->cur_field);
pCtx->cur_field = strdup(pValue);
if (string_is_equal(pValue, "username"))
{
pCtx->cur_member = &rooms->cur->nickname;
pCtx->cur_member_size = sizeof(rooms->cur->nickname);
}
else if (string_is_equal(pValue, "game_name"))
{
pCtx->cur_member = &rooms->cur->gamename;
pCtx->cur_member_size = sizeof(rooms->cur->gamename);
}
else if (string_is_equal(pValue, "core_name"))
{
pCtx->cur_member = &rooms->cur->corename;
pCtx->cur_member_size = sizeof(rooms->cur->corename);
}
else if (string_is_equal(pValue, "ip"))
{
pCtx->cur_member = &rooms->cur->address;
pCtx->cur_member_size = sizeof(rooms->cur->address);
}
else if (string_is_equal(pValue, "port"))
pCtx->cur_member = &rooms->cur->port;
else if (string_is_equal(pValue, "game_crc"))
pCtx->cur_member = &rooms->cur->gamecrc;
else if (string_is_equal(pValue, "core_version"))
{
pCtx->cur_member = &rooms->cur->coreversion;
pCtx->cur_member_size = sizeof(rooms->cur->coreversion);
}
else if (string_is_equal(pValue, "has_password"))
pCtx->cur_member = &rooms->cur->has_password;
else if (string_is_equal(pValue, "has_spectate_password"))
pCtx->cur_member = &rooms->cur->has_spectate_password;
else if (string_is_equal(pValue, "fixed"))
pCtx->cur_member = &rooms->cur->fixed;
else if (string_is_equal(pValue, "mitm_ip"))
pCtx->cur_member = &rooms->cur->mitm_address;
else if (string_is_equal(pValue, "mitm_port"))
pCtx->cur_member = &rooms->cur->mitm_port;
else if (string_is_equal(pValue, "host_method"))
pCtx->cur_member = &rooms->cur->host_method;
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else
{
/* unknown field, ignore it */
free(pCtx->cur_field);
pCtx->cur_field = NULL;
}
}
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL StartArrayHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
if (pCtx->state == STATE_START)
pCtx->state = STATE_ARRAY_START;
return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL EndArrayHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
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return JSON_Parser_Continue;
}
static JSON_Parser_HandlerResult JSON_CALL ArrayItemHandler(JSON_Parser parser)
{
Context* pCtx = (Context*)JSON_Parser_GetUserData(parser);
(void)parser;
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return JSON_Parser_Continue;
}
static int parse_context_setup(Context* pCtx)
{
if (JSON_Parser_GetInputEncoding(pCtx->parser) == JSON_UnknownEncoding)
{
JSON_Parser_SetEncodingDetectedHandler(pCtx->parser, &EncodingDetectedHandler);
}
JSON_Parser_SetNullHandler(pCtx->parser, &NullHandler);
JSON_Parser_SetBooleanHandler(pCtx->parser, &BooleanHandler);
JSON_Parser_SetStringHandler(pCtx->parser, &StringHandler);
JSON_Parser_SetNumberHandler(pCtx->parser, &NumberHandler);
JSON_Parser_SetSpecialNumberHandler(pCtx->parser, &SpecialNumberHandler);
JSON_Parser_SetStartObjectHandler(pCtx->parser, &StartObjectHandler);
JSON_Parser_SetEndObjectHandler(pCtx->parser, &EndObjectHandler);
JSON_Parser_SetObjectMemberHandler(pCtx->parser, &ObjectMemberHandler);
JSON_Parser_SetStartArrayHandler(pCtx->parser, &StartArrayHandler);
JSON_Parser_SetEndArrayHandler(pCtx->parser, &EndArrayHandler);
JSON_Parser_SetArrayItemHandler(pCtx->parser, &ArrayItemHandler);
JSON_Parser_SetUserData(pCtx->parser, pCtx);
return 1;
}
static void parse_context_error(Context* pCtx)
{
if (JSON_Parser_GetError(pCtx->parser) != JSON_Error_AbortedByHandler)
{
JSON_Error error = JSON_Parser_GetError(pCtx->parser);
JSON_Location errorLocation = {0, 0, 0};
(void)JSON_Parser_GetErrorLocation(pCtx->parser, &errorLocation);
RARCH_ERR("invalid JSON at line %d, column %d (input byte %d) - %s.\n",
(int)errorLocation.line + 1,
(int)errorLocation.column + 1,
(int)errorLocation.byte,
JSON_ErrorString(error));
}
}
static int json_parse(Context* pCtx, const char *buf)
{
if (!JSON_Parser_Parse(pCtx->parser, buf, strlen(buf), JSON_True))
{
parse_context_error(pCtx);
return 0;
}
return 1;
}
void netplay_rooms_free()
{
if (rooms)
{
struct netplay_room *room = rooms->head;
if (room)
{
while (room != NULL)
{
struct netplay_room *next = room->next;
free(room);
room = next;
}
free(rooms);
}
else
free(rooms);
rooms = NULL;
}
}
int netplay_rooms_parse(const char *buf)
{
Context ctx;
memset(&ctx, 0, sizeof(ctx));
ctx.state = STATE_START;
/* delete any previous rooms */
netplay_rooms_free();
rooms = (struct netplay_rooms*)calloc(1, sizeof(*rooms));
parse_context_init(&ctx);
ctx.parser = JSON_Parser_Create(NULL);
if (!ctx.parser)
{
RARCH_ERR("could not allocate memory for JSON parser.\n");
return 1;
}
parse_context_setup(&ctx);
json_parse(&ctx, buf);
parse_context_free(&ctx);
return 0;
}
struct netplay_room* netplay_room_get(int index)
{
int cur = 0;
struct netplay_room *room = rooms->head;
if (index < 0)
return NULL;
while (room != NULL)
{
if (cur == index)
break;
room = room->next;
cur++;
}
return room;
}
int netplay_rooms_get_count()
{
int count = 0;
struct netplay_room *room;
if (!rooms)
return count;
room = rooms->head;
if (!room)
return count;
while(room != NULL)
{
count++;
room = room->next;
}
return count;
}