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refactor cJSONUtils_ApplyPatch

pull/159/head
Max Bruckner 8 years ago
parent
63db67bfeb
commit
48c97985d6
1 changed files with 143 additions and 110 deletions
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  1. 253
      cJSON_Utils.c

253
cJSON_Utils.c
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@ -533,54 +533,100 @@ static cJSON_bool insert_item_in_array(cJSON *array, size_t which, cJSON *newite
enum patch_operation { INVALID, ADD, REMOVE, REPLACE, MOVE, COPY, TEST };
static int cJSONUtils_ApplyPatch(cJSON *object, cJSON *patch)
static enum patch_operation decode_patch_operation(const cJSON * const patch)
{
cJSON *op = NULL;
cJSON *path = NULL;
cJSON *value = NULL;
cJSON *parent = NULL;
enum patch_operation opcode = INVALID;
unsigned char *parentptr = NULL;
unsigned char *childptr = NULL;
cJSON *operation = cJSON_GetObjectItem(patch, "op");
if (!cJSON_IsString(operation))
{
return INVALID;
}
op = cJSON_GetObjectItem(patch, "op");
path = cJSON_GetObjectItem(patch, "path");
if (!cJSON_IsString(op) || !cJSON_IsString(path))
if (strcmp(operation->valuestring, "add") == 0)
{
/* malformed patch. */
return 2;
return ADD;
}
/* decode operation */
if (!strcmp(op->valuestring, "add"))
if (strcmp(operation->valuestring, "remove") == 0)
{
opcode = ADD;
return REMOVE;
}
else if (!strcmp(op->valuestring, "remove"))
if (strcmp(operation->valuestring, "replace") == 0)
{
opcode = REMOVE;
return REPLACE;
}
else if (!strcmp(op->valuestring, "replace"))
if (strcmp(operation->valuestring, "move") == 0)
{
opcode = REPLACE;
return MOVE;
}
else if (!strcmp(op->valuestring, "move"))
if (strcmp(operation->valuestring, "copy") == 0)
{
opcode = MOVE;
return COPY;
}
else if (!strcmp(op->valuestring, "copy"))
if (strcmp(operation->valuestring, "test") == 0)
{
opcode = COPY;
return TEST;
}
else if (!strcmp(op->valuestring, "test"))
return INVALID;
}
/* overwrite and existing item with another one and free resources on the way */
static void overwrite_item(cJSON * const root, const cJSON replacement)
{
if (root == NULL)
{
/* compare value: {...} with the given path */
return cJSONUtils_Compare(cJSONUtils_GetPointer(object, path->valuestring), cJSON_GetObjectItem(patch, "value"));
return;
}
else
if (root->string != NULL)
{
cJSON_free(root->string);
}
if (root->valuestring != NULL)
{
cJSON_free(root->valuestring);
}
if (root->child != NULL)
{
cJSON_Delete(root->child);
}
memcpy(root, &replacement, sizeof(cJSON));
}
static int cJSONUtils_ApplyPatch(cJSON *object, const cJSON *patch)
{
cJSON *path = NULL;
cJSON *value = NULL;
cJSON *parent = NULL;
enum patch_operation opcode = INVALID;
unsigned char *parent_pointer = NULL;
unsigned char *child_pointer = NULL;
int status = 0;
path = cJSON_GetObjectItem(patch, "path");
if (!cJSON_IsString(path))
{
/* unknown opcode. */
return 3;
/* malformed patch. */
status = 2;
goto cleanup;
}
opcode = decode_patch_operation(patch);
if (opcode == INVALID)
{
status = 3;
goto cleanup;
}
else if (opcode == TEST)
{
/* compare value: {...} with the given path */
status = cJSONUtils_Compare(cJSONUtils_GetPointer(object, path->valuestring), cJSON_GetObjectItem(patch, "value"));
goto cleanup;
}
/* special case for replacing the root */
@ -588,73 +634,47 @@ static int cJSONUtils_ApplyPatch(cJSON *object, cJSON *patch)
{
if (opcode == REMOVE)
{
/* remove possible children */
if (object->child != NULL)
{
cJSON_Delete(object->child);
}
static const cJSON invalid = { NULL, NULL, NULL, cJSON_Invalid, NULL, 0, 0, NULL};
/* remove other allocated resources */
if (object->string != NULL)
{
cJSON_free(object->string);
}
if (object->valuestring != NULL)
{
cJSON_free(object->valuestring);
}
/* make it invalid */
memset(object, '\0', sizeof(cJSON));
overwrite_item(object, invalid);
return 0;
status = 0;
goto cleanup;
}
if ((opcode == REPLACE) || (opcode == ADD))
{
/* remove possible children */
if (object->child != NULL)
{
cJSON_Delete(object->child);
}
/* remove other allocated resources */
if (object->string != NULL)
{
cJSON_free(object->string);
}
if (object->valuestring != NULL)
{
cJSON_free(object->valuestring);
}
value = cJSON_GetObjectItem(patch, "value");
if (value == NULL)
{
/* missing "value" for add/replace. */
return 7;
status = 7;
goto cleanup;
}
value = cJSON_Duplicate(value, 1);
if (value == NULL)
{
/* out of memory for add/replace. */
return 8;
}
/* the string "value" isn't needed */
if (value->string != NULL)
{
cJSON_free(value->string);
value->string = NULL;
status = 8;
goto cleanup;
}
/* copy over the value object */
memcpy(object, value, sizeof(cJSON));
overwrite_item(object, *value);
/* delete the duplicated value */
cJSON_free(value);
value = NULL;
return 0;
/* the string "value" isn't needed */
if (object->string != NULL)
{
cJSON_free(object->string);
object->string = NULL;
}
status = 0;
goto cleanup;
}
}
@ -664,13 +684,15 @@ static int cJSONUtils_ApplyPatch(cJSON *object, cJSON *patch)
cJSON *old_item = cJSONUtils_PatchDetach(object, (unsigned char*)path->valuestring);
if (old_item == NULL)
{
return 13;
status = 13;
goto cleanup;
}
cJSON_Delete(old_item);
if (opcode == REMOVE)
{
/* For Remove, this job is done. */
return 0;
status = 0;
goto cleanup;
}
}
@ -678,10 +700,11 @@ static int cJSONUtils_ApplyPatch(cJSON *object, cJSON *patch)
if ((opcode == MOVE) || (opcode == COPY))
{
cJSON *from = cJSON_GetObjectItem(patch, "from");
if (!from)
if (from == NULL)
{
/* missing "from" for copy/move. */
return 4;
status = 4;
goto cleanup;
}
if (opcode == MOVE)
@ -692,93 +715,103 @@ static int cJSONUtils_ApplyPatch(cJSON *object, cJSON *patch)
{
value = cJSONUtils_GetPointer(object, from->valuestring);
}
if (!value)
if (value == NULL)
{
/* missing "from" for copy/move. */
return 5;
status = 5;
goto cleanup;
}
if (opcode == COPY)
{
value = cJSON_Duplicate(value, 1);
}
if (!value)
if (value == NULL)
{
/* out of memory for copy/move. */
return 6;
status = 6;
goto cleanup;
}
}
else /* Add/Replace uses "value". */
{
value = cJSON_GetObjectItem(patch, "value");
if (!value)
if (value == NULL)
{
/* missing "value" for add/replace. */
return 7;
status = 7;
goto cleanup;
}
value = cJSON_Duplicate(value, 1);
if (!value)
if (value == NULL)
{
/* out of memory for add/replace. */
return 8;
status = 8;
goto cleanup;
}
}
/* Now, just add "value" to "path". */
/* split pointer in parent and child */
parentptr = cJSONUtils_strdup((unsigned char*)path->valuestring);
childptr = (unsigned char*)strrchr((char*)parentptr, '/');
if (childptr)
parent_pointer = cJSONUtils_strdup((unsigned char*)path->valuestring);
child_pointer = (unsigned char*)strrchr((char*)parent_pointer, '/');
if (child_pointer != NULL)
{
*childptr++ = '\0';
child_pointer[0] = '\0';
child_pointer++;
}
parent = cJSONUtils_GetPointer(object, (char*)parentptr);
cJSONUtils_InplaceDecodePointerString(childptr);
parent = cJSONUtils_GetPointer(object, (char*)parent_pointer);
cJSONUtils_InplaceDecodePointerString(child_pointer);
/* add, remove, replace, move, copy, test. */
if ((parent == NULL) || (childptr == NULL))
if ((parent == NULL) || (child_pointer == NULL))
{
/* Couldn't find object to add to. */
free(parentptr);
cJSON_Delete(value);
return 9;
status = 9;
goto cleanup;
}
else if (cJSON_IsArray(parent))
{
if (!strcmp((char*)childptr, "-"))
if (strcmp((char*)child_pointer, "-") == 0)
{
cJSON_AddItemToArray(parent, value);
value = NULL;
}
else
{
size_t index = 0;
if (!decode_array_index_from_pointer(childptr, &index))
if (!decode_array_index_from_pointer(child_pointer, &index))
{
free(parentptr);
cJSON_Delete(value);
return 11;
status = 11;
goto cleanup;
}
if (!insert_item_in_array(parent, index, value))
{
free(parentptr);
cJSON_Delete(value);
return 10;
status = 10;
goto cleanup;
}
value = NULL;
}
}
else if (cJSON_IsObject(parent))
{
cJSON_DeleteItemFromObject(parent, (char*)childptr);
cJSON_AddItemToObject(parent, (char*)childptr, value);
cJSON_DeleteItemFromObject(parent, (char*)child_pointer);
cJSON_AddItemToObject(parent, (char*)child_pointer, value);
value = NULL;
}
else
cleanup:
if (value != NULL)
{
cJSON_Delete(value);
}
free(parentptr);
if (parent_pointer != NULL)
{
cJSON_free(parent_pointer);
}
return 0;
return status;
}
CJSON_PUBLIC(int) cJSONUtils_ApplyPatches(cJSON *object, cJSON *patches)

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