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+/****************************************************************************
+ * examples/wgetjson/wgetjson_main.c
+ *
+ * Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ * Author: Darcy Gong
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <apps/netutils/uiplib.h>
+#include <apps/netutils/webclient.h>
+#include <apps/netutils/cJSON.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#ifndef CONFIG_EXAMPLES_WGETJSON_MAXSIZE
+# define CONFIG_EXAMPLES_WGETJSON_MAXSIZE 1024*10
+#endif
+
+#ifndef CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL
+# define CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL "http://10.0.0.1/wgetjson/json_cmd.php"
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static char *g_json_buff = NULL;
+static int g_json_bufflen = 0;
+static bool g_has_json = false;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: wgetjson_callback
+ ****************************************************************************/
+
+static void wgetjson_callback(FAR char **buffer, int offset, int datend,
+ FAR int *buflen, FAR void *arg)
+{
+ int len = datend - offset,org=len;
+
+ if (len <= 0)
+ {
+ return;
+ }
+
+ if (!g_json_buff)
+ {
+ g_json_buff = malloc(len + 1);
+ memcpy(g_json_buff, &((*buffer)[offset]), len);
+ g_json_buff[len] = 0;
+ g_json_bufflen = len;
+ }
+ else
+ {
+ if (g_json_bufflen >= CONFIG_EXAMPLES_WGETJSON_MAXSIZE)
+ {
+ g_json_bufflen += org;
+ return;
+ }
+
+ if (g_json_bufflen+len > CONFIG_EXAMPLES_WGETJSON_MAXSIZE)
+ {
+ len = CONFIG_EXAMPLES_WGETJSON_MAXSIZE - g_json_bufflen;
+ }
+
+ g_json_buff = realloc(g_json_buff, g_json_bufflen + len + 1);
+ memcpy(&g_json_buff[g_json_bufflen-1], &((*buffer)[offset]), len);
+ g_json_buff[g_json_bufflen + len] = 0;
+ g_json_bufflen += org;
+ }
+}
+
+/****************************************************************************
+ * Name: wgetjson_json_release
+ ****************************************************************************/
+
+static void wgetjson_json_release(void)
+{
+ if (g_json_buff)
+ {
+ free(g_json_buff);
+ g_json_buff = NULL;
+ }
+
+ g_json_bufflen = 0;
+}
+
+/****************************************************************************
+ * Name: wgetjson_doit
+ ****************************************************************************/
+
+#if 0 /* Not used */
+static void wgetjson_doit(char *text)
+{
+ char *out;
+ cJSON *json;
+
+ json = cJSON_Parse(text);
+ if (!json)
+ {
+ printf("Error before: [%s]\n",cJSON_GetErrorPtr());
+ }
+ else
+ {
+ out = cJSON_Print(json);
+ cJSON_Delete(json);
+ printf("%s\n", out);
+ free(out);
+ }
+}
+#endif
+
+/****************************************************************************
+ * Name: wgetjson_json_item_callback
+ ****************************************************************************/
+
+static int wgetjson_json_item_callback(const char *name,int type,cJSON *item)
+{
+ if (strlen(name) > 8 && !memcmp(name, "/(null)", 7))
+ {
+ name += 8;
+ g_has_json = true;
+ }
+
+ if (!strcmp(name, "name"))
+ {
+ printf("name:\t\t\t%s \n", item->valuestring);
+ // todo something....
+ }
+ else if (strcmp(name, "format/type")==0)
+ {
+ printf("format/type:\t\t%s \n", item->valuestring);
+ // todo something....
+ }
+ else if (!strcmp(name, "format/width"))
+ {
+ printf("format/width:\t\t%d \n", item->valueint);
+ // todo something....
+ }
+ else if (!strcmp(name, "format/height"))
+ {
+ printf("format/height:\t\t%d \n", item->valueint);
+ // todo something....
+ }
+ else if (!strcmp(name, "format/interlace"))
+ {
+ printf("format/interlace:\t%s \n", (item->valueint) ? "true" : "false");
+ // todo something....
+ }
+ else if (!strcmp(name, "format/frame rate"))
+ {
+ printf("format/frame rate:\t%d \n", item->valueint);
+ // todo something....
+ }
+
+ return 1;
+}
+
+/****************************************************************************
+ * Name: wgetjson_json_item_scan
+ ****************************************************************************/
+
+static void wgetjson_json_item_scan(cJSON *item, const char *prefix)
+{
+ char *newprefix;
+ int dorecurse;
+
+ while (item)
+ {
+ newprefix = malloc(strlen(prefix) + strlen(item->string) + 2);
+ sprintf(newprefix, "%s/%s", prefix, item->string);
+
+ dorecurse = wgetjson_json_item_callback(newprefix, item->type, item);
+ if (item->child && dorecurse)
+ {
+ wgetjson_json_item_scan(item->child, newprefix);
+ }
+
+ item = item->next;
+ free(newprefix);
+ }
+}
+
+/****************************************************************************
+ * Name: wgetjson_json_parse
+ ****************************************************************************/
+
+static int wgetjson_json_parse(char *text)
+{
+ cJSON *json;
+ char *path = "";
+
+ json=cJSON_Parse(text);
+ if (!json)
+ {
+ printf("Error before: [%s]\n", cJSON_GetErrorPtr());
+ return ERROR;
+ }
+ else
+ {
+ wgetjson_json_item_scan(json, path);
+ cJSON_Delete(json);
+ return OK;
+ }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: wgetjson_main
+ ****************************************************************************/
+
+int wgetjson_main(int argc, char *argv[])
+{
+ char *buffer = NULL;
+ char *url = CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL;
+ int ret;
+
+ buffer = malloc(512);
+ wgetjson_json_release();
+
+ printf("URL: %s\n", url);
+
+ ret = wget(url, buffer, 512, wgetjson_callback, NULL);
+ if (ret < 0)
+ {
+ printf("get json size: %d\n",g_json_bufflen);
+ }
+ else
+ {
+ g_has_json = false;
+ if (wgetjson_json_parse(g_json_buff) == OK && g_has_json)
+ {
+ printf("Parse OK\n");
+ }
+ else
+ {
+ printf("Parse error\n");
+ }
+
+ g_has_json = false;
+ }
+
+ wgetjson_json_release();
+ free(buffer);
+ return 0;
+}
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