github
/
cJSON
mirror of https://github.com/DaveGamble/cJSON.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

refactor cJSONUtils_ApplyPatch

pull/159/head
Max Bruckner 8 years ago
parent
63db67bfeb
commit
48c97985d6
1 changed files with 143 additions and 110 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 239
      cJSON_Utils.c

239
cJSON_Utils.c
View File

@ -533,128 +533,148 @@ 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;
op = cJSON_GetObjectItem(patch, "op");
path = cJSON_GetObjectItem(patch, "path");
if (!cJSON_IsString(op) || !cJSON_IsString(path))
cJSON *operation = cJSON_GetObjectItem(patch, "op");
if (!cJSON_IsString(operation))
{
/* malformed patch. */
return 2;
return INVALID;
}
/* decode operation */
if (!strcmp(op->valuestring, "add"))
if (strcmp(operation->valuestring, "add") == 0)
{
opcode = ADD;
return ADD;
}
else if (!strcmp(op->valuestring, "remove"))
if (strcmp(operation->valuestring, "remove") == 0)
{
opcode = REMOVE;
return REMOVE;
}
else if (!strcmp(op->valuestring, "replace"))
if (strcmp(operation->valuestring, "replace") == 0)
{
opcode = REPLACE;
return REPLACE;
}
else if (!strcmp(op->valuestring, "move"))
if (strcmp(operation->valuestring, "move") == 0)
{
opcode = MOVE;
return MOVE;
}
else if (!strcmp(op->valuestring, "copy"))
if (strcmp(operation->valuestring, "copy") == 0)
{
opcode = COPY;
return COPY;
}
else if (!strcmp(op->valuestring, "test"))
if (strcmp(operation->valuestring, "test") == 0)
{
/* compare value: {...} with the given path */
return cJSONUtils_Compare(cJSONUtils_GetPointer(object, path->valuestring), cJSON_GetObjectItem(patch, "value"));
return TEST;
}
else
{
/* unknown opcode. */
return 3;
return INVALID;
}
/* special case for replacing the root */
if (path->valuestring[0] == '\0')
{
if (opcode == REMOVE)
/* overwrite and existing item with another one and free resources on the way */
static void overwrite_item(cJSON * const root, const cJSON replacement)
{
/* remove possible children */
if (object->child != NULL)
if (root == NULL)
{
cJSON_Delete(object->child);
return;
}
/* remove other allocated resources */
if (object->string != NULL)
if (root->string != NULL)
{
cJSON_free(object->string);
cJSON_free(root->string);
}
if (object->valuestring != NULL)
if (root->valuestring != NULL)
{
cJSON_free(object->valuestring);
cJSON_free(root->valuestring);
}
if (root->child != NULL)
{
cJSON_Delete(root->child);
}
/* make it invalid */
memset(object, '\0', sizeof(cJSON));
return 0;
memcpy(root, &replacement, sizeof(cJSON));
}
if ((opcode == REPLACE) || (opcode == ADD))
static int cJSONUtils_ApplyPatch(cJSON *object, const cJSON *patch)
{
/* remove possible children */
if (object->child != NULL)
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))
{
cJSON_Delete(object->child);
/* malformed patch. */
status = 2;
goto cleanup;
}
/* remove other allocated resources */
if (object->string != NULL)
opcode = decode_patch_operation(patch);
if (opcode == INVALID)
{
cJSON_free(object->string);
status = 3;
goto cleanup;
}
if (object->valuestring != NULL)
else if (opcode == TEST)
{
cJSON_free(object->valuestring);
/* 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 */
if (path->valuestring[0] == '\0')
{
if (opcode == REMOVE)
{
static const cJSON invalid = { NULL, NULL, NULL, cJSON_Invalid, NULL, 0, 0, NULL};
overwrite_item(object, invalid);
status = 0;
goto cleanup;
}
if ((opcode == REPLACE) || (opcode == ADD))
{
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)

Write Preview
Loading…
Cancel
Save