FS-10036: update cJSON code to pre 1.4.0 release of cJSON. this includes backports of all our fixes, and our build macros for windows and visibility. It also makes it easy to drop in a new version, and to in the future be able to switch to a system version of cJSON easily (after all these updates are in, probably around v2.0 timeframe. Note this new version adds a lot of extra error checking, fixes some buffer overruns, and improves parser and printer performance

src/include/switch_cJSON_Utils.h

@@ -0,0 +1,44 @@
+#include "switch_cJSON.h"
+
+/* Implement RFC6901 (https://tools.ietf.org/html/rfc6901) JSON Pointer spec. */
+CJSON_PUBLIC(cJSON *) cJSONUtils_GetPointer(cJSON *object, const char *pointer);
+
+/* Implement RFC6902 (https://tools.ietf.org/html/rfc6902) JSON Patch spec. */
+CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatches(cJSON *from, cJSON *to);
+/* Utility for generating patch array entries. */
+CJSON_PUBLIC(void) cJSONUtils_AddPatchToArray(cJSON *array, const char *op, const char *path, cJSON *val);
+/* Returns 0 for success. */
+CJSON_PUBLIC(int) cJSONUtils_ApplyPatches(cJSON *object, cJSON *patches);
+
+/*
+// Note that ApplyPatches is NOT atomic on failure. To implement an atomic ApplyPatches, use:
+//int cJSONUtils_AtomicApplyPatches(cJSON **object, cJSON *patches)
+//{
+//    cJSON *modme = cJSON_Duplicate(*object, 1);
+//    int error = cJSONUtils_ApplyPatches(modme, patches);
+//    if (!error)
+//    {
+//        cJSON_Delete(*object);
+//        *object = modme;
+//    }
+//    else
+//    {
+//        cJSON_Delete(modme);
+//    }
+//
+//    return error;
+//}
+// Code not added to library since this strategy is a LOT slower.
+*/
+
+/* Implement RFC7386 (https://tools.ietf.org/html/rfc7396) JSON Merge Patch spec. */
+/* target will be modified by patch. return value is new ptr for target. */
+CJSON_PUBLIC(cJSON *) cJSONUtils_MergePatch(cJSON *target, cJSON *patch);
+/* generates a patch to move from -> to */
+CJSON_PUBLIC(cJSON *) cJSONUtils_GenerateMergePatch(cJSON *from, cJSON *to);
+
+/* Given a root object and a target object, construct a pointer from one to the other. */
+CJSON_PUBLIC(char *) cJSONUtils_FindPointerFromObjectTo(cJSON *object, cJSON *target);
+
+/* Sorts the members of the object into alphabetical order. */
+CJSON_PUBLIC(void) cJSONUtils_SortObject(cJSON *object);