1482 lines
40 KiB
C
1482 lines
40 KiB
C
/*
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Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/* disable warnings about old C89 functions in MSVC */
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#if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER)
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#define _CRT_SECURE_NO_DEPRECATE
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#endif
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#ifdef __GNUCC__
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#pragma GCC visibility push(default)
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#endif
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#if defined(_MSC_VER)
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#pragma warning (push)
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/* disable warning about single line comments in system headers */
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#pragma warning (disable : 4001)
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#endif
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include <math.h>
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#include <float.h>
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#include <math.h>
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#if defined(_MSC_VER)
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#pragma warning (pop)
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#endif
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#ifdef __GNUCC__
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#pragma GCC visibility pop
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#endif
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#include "cJSON_Utils.h"
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/* define our own boolean type */
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#ifdef true
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#undef true
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#endif
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#define true ((cJSON_bool)1)
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#ifdef false
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#undef false
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#endif
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#define false ((cJSON_bool)0)
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static unsigned char* cJSONUtils_strdup(const unsigned char* const string)
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{
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size_t length = 0;
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unsigned char *copy = NULL;
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length = strlen((const char*)string) + sizeof("");
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copy = (unsigned char*) cJSON_malloc(length);
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if (copy == NULL)
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{
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return NULL;
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}
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memcpy(copy, string, length);
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return copy;
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}
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/* string comparison which doesn't consider NULL pointers equal */
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static int compare_strings(const unsigned char *string1, const unsigned char *string2, const cJSON_bool case_sensitive)
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{
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if ((string1 == NULL) || (string2 == NULL))
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{
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return 1;
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}
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if (string1 == string2)
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{
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return 0;
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}
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if (case_sensitive)
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{
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return strcmp((const char*)string1, (const char*)string2);
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}
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for(; tolower(*string1) == tolower(*string2); (void)string1++, string2++)
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{
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if (*string1 == '\0')
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{
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return 0;
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}
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}
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return tolower(*string1) - tolower(*string2);
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}
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/* securely comparison of floating-point variables */
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static cJSON_bool compare_double(double a, double b)
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{
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double maxVal = fabs(a) > fabs(b) ? fabs(a) : fabs(b);
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return (fabs(a - b) <= maxVal * DBL_EPSILON);
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}
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/* Compare the next path element of two JSON pointers, two NULL pointers are considered unequal: */
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static cJSON_bool compare_pointers(const unsigned char *name, const unsigned char *pointer, const cJSON_bool case_sensitive)
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{
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if ((name == NULL) || (pointer == NULL))
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{
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return false;
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}
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for (; (*name != '\0') && (*pointer != '\0') && (*pointer != '/'); (void)name++, pointer++) /* compare until next '/' */
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{
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if (*pointer == '~')
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{
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/* check for escaped '~' (~0) and '/' (~1) */
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if (((pointer[1] != '0') || (*name != '~')) && ((pointer[1] != '1') || (*name != '/')))
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{
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/* invalid escape sequence or wrong character in *name */
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return false;
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}
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else
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{
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pointer++;
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}
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}
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else if ((!case_sensitive && (tolower(*name) != tolower(*pointer))) || (case_sensitive && (*name != *pointer)))
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{
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return false;
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}
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}
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if (((*pointer != 0) && (*pointer != '/')) != (*name != 0))
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{
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/* one string has ended, the other not */
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return false;;
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}
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return true;
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}
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/* calculate the length of a string if encoded as JSON pointer with ~0 and ~1 escape sequences */
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static size_t pointer_encoded_length(const unsigned char *string)
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{
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size_t length;
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for (length = 0; *string != '\0'; (void)string++, length++)
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{
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/* character needs to be escaped? */
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if ((*string == '~') || (*string == '/'))
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{
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length++;
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}
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}
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return length;
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}
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/* copy a string while escaping '~' and '/' with ~0 and ~1 JSON pointer escape codes */
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static void encode_string_as_pointer(unsigned char *destination, const unsigned char *source)
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{
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for (; source[0] != '\0'; (void)source++, destination++)
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{
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if (source[0] == '/')
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{
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destination[0] = '~';
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destination[1] = '1';
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destination++;
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}
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else if (source[0] == '~')
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{
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destination[0] = '~';
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destination[1] = '0';
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destination++;
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}
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else
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{
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destination[0] = source[0];
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}
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}
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destination[0] = '\0';
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}
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CJSON_PUBLIC(char *) cJSONUtils_FindPointerFromObjectTo(const cJSON * const object, const cJSON * const target)
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{
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size_t child_index = 0;
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cJSON *current_child = 0;
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if ((object == NULL) || (target == NULL))
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{
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return NULL;
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}
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if (object == target)
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{
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/* found */
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return (char*)cJSONUtils_strdup((const unsigned char*)"");
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}
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/* recursively search all children of the object or array */
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for (current_child = object->child; current_child != NULL; (void)(current_child = current_child->next), child_index++)
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{
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unsigned char *target_pointer = (unsigned char*)cJSONUtils_FindPointerFromObjectTo(current_child, target);
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/* found the target? */
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if (target_pointer != NULL)
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{
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if (cJSON_IsArray(object))
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{
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/* reserve enough memory for a 64 bit integer + '/' and '\0' */
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unsigned char *full_pointer = (unsigned char*)cJSON_malloc(strlen((char*)target_pointer) + 20 + sizeof("/"));
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/* check if conversion to unsigned long is valid
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* This should be eliminated at compile time by dead code elimination
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* if size_t is an alias of unsigned long, or if it is bigger */
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if (child_index > ULONG_MAX)
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{
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cJSON_free(target_pointer);
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cJSON_free(full_pointer);
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return NULL;
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}
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sprintf((char*)full_pointer, "/%lu%s", (unsigned long)child_index, target_pointer); /* /<array_index><path> */
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cJSON_free(target_pointer);
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return (char*)full_pointer;
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}
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if (cJSON_IsObject(object))
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{
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unsigned char *full_pointer = (unsigned char*)cJSON_malloc(strlen((char*)target_pointer) + pointer_encoded_length((unsigned char*)current_child->string) + 2);
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full_pointer[0] = '/';
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encode_string_as_pointer(full_pointer + 1, (unsigned char*)current_child->string);
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strcat((char*)full_pointer, (char*)target_pointer);
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cJSON_free(target_pointer);
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return (char*)full_pointer;
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}
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/* reached leaf of the tree, found nothing */
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cJSON_free(target_pointer);
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return NULL;
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}
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}
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/* not found */
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return NULL;
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}
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/* non broken version of cJSON_GetArrayItem */
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static cJSON *get_array_item(const cJSON *array, size_t item)
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{
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cJSON *child = array ? array->child : NULL;
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while ((child != NULL) && (item > 0))
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{
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item--;
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child = child->next;
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}
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return child;
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}
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static cJSON_bool decode_array_index_from_pointer(const unsigned char * const pointer, size_t * const index)
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{
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size_t parsed_index = 0;
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size_t position = 0;
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if ((pointer[0] == '0') && ((pointer[1] != '\0') && (pointer[1] != '/')))
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{
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/* leading zeroes are not permitted */
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return 0;
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}
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for (position = 0; (pointer[position] >= '0') && (pointer[0] <= '9'); position++)
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{
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parsed_index = (10 * parsed_index) + (size_t)(pointer[position] - '0');
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}
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if ((pointer[position] != '\0') && (pointer[position] != '/'))
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{
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return 0;
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}
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*index = parsed_index;
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return 1;
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}
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static cJSON *get_item_from_pointer(cJSON * const object, const char * pointer, const cJSON_bool case_sensitive)
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{
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cJSON *current_element = object;
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if (pointer == NULL)
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{
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return NULL;
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}
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/* follow path of the pointer */
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while ((pointer[0] == '/') && (current_element != NULL))
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{
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pointer++;
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if (cJSON_IsArray(current_element))
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{
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size_t index = 0;
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if (!decode_array_index_from_pointer((const unsigned char*)pointer, &index))
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{
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return NULL;
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}
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current_element = get_array_item(current_element, index);
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}
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else if (cJSON_IsObject(current_element))
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{
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current_element = current_element->child;
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/* GetObjectItem. */
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while ((current_element != NULL) && !compare_pointers((unsigned char*)current_element->string, (const unsigned char*)pointer, case_sensitive))
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{
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current_element = current_element->next;
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}
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}
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else
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{
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return NULL;
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}
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/* skip to the next path token or end of string */
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while ((pointer[0] != '\0') && (pointer[0] != '/'))
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{
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pointer++;
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}
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}
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return current_element;
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}
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CJSON_PUBLIC(cJSON *) cJSONUtils_GetPointer(cJSON * const object, const char *pointer)
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{
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return get_item_from_pointer(object, pointer, false);
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}
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CJSON_PUBLIC(cJSON *) cJSONUtils_GetPointerCaseSensitive(cJSON * const object, const char *pointer)
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{
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return get_item_from_pointer(object, pointer, true);
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}
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/* JSON Patch implementation. */
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static void decode_pointer_inplace(unsigned char *string)
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{
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unsigned char *decoded_string = string;
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if (string == NULL) {
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return;
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}
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for (; *string; (void)decoded_string++, string++)
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{
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if (string[0] == '~')
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{
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if (string[1] == '0')
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{
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decoded_string[0] = '~';
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}
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else if (string[1] == '1')
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{
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decoded_string[1] = '/';
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}
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else
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{
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/* invalid escape sequence */
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return;
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}
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string++;
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}
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}
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decoded_string[0] = '\0';
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}
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/* non-broken cJSON_DetachItemFromArray */
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static cJSON *detach_item_from_array(cJSON *array, size_t which)
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{
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cJSON *c = array->child;
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while (c && (which > 0))
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{
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c = c->next;
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which--;
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}
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if (!c)
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{
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/* item doesn't exist */
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return NULL;
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}
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if (c != array->child)
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{
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/* not the first element */
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c->prev->next = c->next;
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}
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if (c->next)
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{
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c->next->prev = c->prev;
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}
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if (c == array->child)
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{
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array->child = c->next;
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}
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else if (c->next == NULL)
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{
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array->child->prev = c->prev;
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}
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/* make sure the detached item doesn't point anywhere anymore */
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c->prev = c->next = NULL;
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return c;
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}
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|
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/* detach an item at the given path */
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static cJSON *detach_path(cJSON *object, const unsigned char *path, const cJSON_bool case_sensitive)
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{
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unsigned char *parent_pointer = NULL;
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unsigned char *child_pointer = NULL;
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cJSON *parent = NULL;
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cJSON *detached_item = NULL;
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|
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/* copy path and split it in parent and child */
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parent_pointer = cJSONUtils_strdup(path);
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if (parent_pointer == NULL) {
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goto cleanup;
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}
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child_pointer = (unsigned char*)strrchr((char*)parent_pointer, '/'); /* last '/' */
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if (child_pointer == NULL)
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{
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goto cleanup;
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}
|
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/* split strings */
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child_pointer[0] = '\0';
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child_pointer++;
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parent = get_item_from_pointer(object, (char*)parent_pointer, case_sensitive);
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decode_pointer_inplace(child_pointer);
|
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|
|
if (cJSON_IsArray(parent))
|
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{
|
|
size_t index = 0;
|
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if (!decode_array_index_from_pointer(child_pointer, &index))
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{
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goto cleanup;
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}
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detached_item = detach_item_from_array(parent, index);
|
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}
|
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else if (cJSON_IsObject(parent))
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{
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detached_item = cJSON_DetachItemFromObject(parent, (char*)child_pointer);
|
|
}
|
|
else
|
|
{
|
|
/* Couldn't find object to remove child from. */
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
if (parent_pointer != NULL)
|
|
{
|
|
cJSON_free(parent_pointer);
|
|
}
|
|
|
|
return detached_item;
|
|
}
|
|
|
|
/* sort lists using mergesort */
|
|
static cJSON *sort_list(cJSON *list, const cJSON_bool case_sensitive)
|
|
{
|
|
cJSON *first = list;
|
|
cJSON *second = list;
|
|
cJSON *current_item = list;
|
|
cJSON *result = list;
|
|
cJSON *result_tail = NULL;
|
|
|
|
if ((list == NULL) || (list->next == NULL))
|
|
{
|
|
/* One entry is sorted already. */
|
|
return result;
|
|
}
|
|
|
|
while ((current_item != NULL) && (current_item->next != NULL) && (compare_strings((unsigned char*)current_item->string, (unsigned char*)current_item->next->string, case_sensitive) < 0))
|
|
{
|
|
/* Test for list sorted. */
|
|
current_item = current_item->next;
|
|
}
|
|
if ((current_item == NULL) || (current_item->next == NULL))
|
|
{
|
|
/* Leave sorted lists unmodified. */
|
|
return result;
|
|
}
|
|
|
|
/* reset pointer to the beginning */
|
|
current_item = list;
|
|
while (current_item != NULL)
|
|
{
|
|
/* Walk two pointers to find the middle. */
|
|
second = second->next;
|
|
current_item = current_item->next;
|
|
/* advances current_item two steps at a time */
|
|
if (current_item != NULL)
|
|
{
|
|
current_item = current_item->next;
|
|
}
|
|
}
|
|
if ((second != NULL) && (second->prev != NULL))
|
|
{
|
|
/* Split the lists */
|
|
second->prev->next = NULL;
|
|
second->prev = NULL;
|
|
}
|
|
|
|
/* Recursively sort the sub-lists. */
|
|
first = sort_list(first, case_sensitive);
|
|
second = sort_list(second, case_sensitive);
|
|
result = NULL;
|
|
|
|
/* Merge the sub-lists */
|
|
while ((first != NULL) && (second != NULL))
|
|
{
|
|
cJSON *smaller = NULL;
|
|
if (compare_strings((unsigned char*)first->string, (unsigned char*)second->string, case_sensitive) < 0)
|
|
{
|
|
smaller = first;
|
|
}
|
|
else
|
|
{
|
|
smaller = second;
|
|
}
|
|
|
|
if (result == NULL)
|
|
{
|
|
/* start merged list with the smaller element */
|
|
result_tail = smaller;
|
|
result = smaller;
|
|
}
|
|
else
|
|
{
|
|
/* add smaller element to the list */
|
|
result_tail->next = smaller;
|
|
smaller->prev = result_tail;
|
|
result_tail = smaller;
|
|
}
|
|
|
|
if (first == smaller)
|
|
{
|
|
first = first->next;
|
|
}
|
|
else
|
|
{
|
|
second = second->next;
|
|
}
|
|
}
|
|
|
|
if (first != NULL)
|
|
{
|
|
/* Append rest of first list. */
|
|
if (result == NULL)
|
|
{
|
|
return first;
|
|
}
|
|
result_tail->next = first;
|
|
first->prev = result_tail;
|
|
}
|
|
if (second != NULL)
|
|
{
|
|
/* Append rest of second list */
|
|
if (result == NULL)
|
|
{
|
|
return second;
|
|
}
|
|
result_tail->next = second;
|
|
second->prev = result_tail;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void sort_object(cJSON * const object, const cJSON_bool case_sensitive)
|
|
{
|
|
if (object == NULL)
|
|
{
|
|
return;
|
|
}
|
|
object->child = sort_list(object->child, case_sensitive);
|
|
}
|
|
|
|
static cJSON_bool compare_json(cJSON *a, cJSON *b, const cJSON_bool case_sensitive)
|
|
{
|
|
if ((a == NULL) || (b == NULL) || ((a->type & 0xFF) != (b->type & 0xFF)))
|
|
{
|
|
/* mismatched type. */
|
|
return false;
|
|
}
|
|
switch (a->type & 0xFF)
|
|
{
|
|
case cJSON_Number:
|
|
/* numeric mismatch. */
|
|
if ((a->valueint != b->valueint) || (!compare_double(a->valuedouble, b->valuedouble)))
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
|
|
case cJSON_String:
|
|
/* string mismatch. */
|
|
if (strcmp(a->valuestring, b->valuestring) != 0)
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
|
|
case cJSON_Array:
|
|
for ((void)(a = a->child), b = b->child; (a != NULL) && (b != NULL); (void)(a = a->next), b = b->next)
|
|
{
|
|
cJSON_bool identical = compare_json(a, b, case_sensitive);
|
|
if (!identical)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* array size mismatch? (one of both children is not NULL) */
|
|
if ((a != NULL) || (b != NULL))
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
|
|
case cJSON_Object:
|
|
sort_object(a, case_sensitive);
|
|
sort_object(b, case_sensitive);
|
|
for ((void)(a = a->child), b = b->child; (a != NULL) && (b != NULL); (void)(a = a->next), b = b->next)
|
|
{
|
|
cJSON_bool identical = false;
|
|
/* compare object keys */
|
|
if (compare_strings((unsigned char*)a->string, (unsigned char*)b->string, case_sensitive))
|
|
{
|
|
/* missing member */
|
|
return false;
|
|
}
|
|
identical = compare_json(a, b, case_sensitive);
|
|
if (!identical)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* object length mismatch (one of both children is not null) */
|
|
if ((a != NULL) || (b != NULL))
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* null, true or false */
|
|
return true;
|
|
}
|
|
|
|
/* non broken version of cJSON_InsertItemInArray */
|
|
static cJSON_bool insert_item_in_array(cJSON *array, size_t which, cJSON *newitem)
|
|
{
|
|
cJSON *child = array->child;
|
|
while (child && (which > 0))
|
|
{
|
|
child = child->next;
|
|
which--;
|
|
}
|
|
if (which > 0)
|
|
{
|
|
/* item is after the end of the array */
|
|
return 0;
|
|
}
|
|
if (child == NULL)
|
|
{
|
|
cJSON_AddItemToArray(array, newitem);
|
|
return 1;
|
|
}
|
|
|
|
/* insert into the linked list */
|
|
newitem->next = child;
|
|
newitem->prev = child->prev;
|
|
child->prev = newitem;
|
|
|
|
/* was it at the beginning */
|
|
if (child == array->child)
|
|
{
|
|
array->child = newitem;
|
|
}
|
|
else
|
|
{
|
|
newitem->prev->next = newitem;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static cJSON *get_object_item(const cJSON * const object, const char* name, const cJSON_bool case_sensitive)
|
|
{
|
|
if (case_sensitive)
|
|
{
|
|
return cJSON_GetObjectItemCaseSensitive(object, name);
|
|
}
|
|
|
|
return cJSON_GetObjectItem(object, name);
|
|
}
|
|
|
|
enum patch_operation { INVALID, ADD, REMOVE, REPLACE, MOVE, COPY, TEST };
|
|
|
|
static enum patch_operation decode_patch_operation(const cJSON * const patch, const cJSON_bool case_sensitive)
|
|
{
|
|
cJSON *operation = get_object_item(patch, "op", case_sensitive);
|
|
if (!cJSON_IsString(operation))
|
|
{
|
|
return INVALID;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "add") == 0)
|
|
{
|
|
return ADD;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "remove") == 0)
|
|
{
|
|
return REMOVE;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "replace") == 0)
|
|
{
|
|
return REPLACE;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "move") == 0)
|
|
{
|
|
return MOVE;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "copy") == 0)
|
|
{
|
|
return COPY;
|
|
}
|
|
|
|
if (strcmp(operation->valuestring, "test") == 0)
|
|
{
|
|
return 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)
|
|
{
|
|
return;
|
|
}
|
|
|
|
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 apply_patch(cJSON *object, const cJSON *patch, const cJSON_bool case_sensitive)
|
|
{
|
|
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 = get_object_item(patch, "path", case_sensitive);
|
|
if (!cJSON_IsString(path))
|
|
{
|
|
/* malformed patch. */
|
|
status = 2;
|
|
goto cleanup;
|
|
}
|
|
|
|
opcode = decode_patch_operation(patch, case_sensitive);
|
|
if (opcode == INVALID)
|
|
{
|
|
status = 3;
|
|
goto cleanup;
|
|
}
|
|
else if (opcode == TEST)
|
|
{
|
|
/* compare value: {...} with the given path */
|
|
status = !compare_json(get_item_from_pointer(object, path->valuestring, case_sensitive), get_object_item(patch, "value", case_sensitive), case_sensitive);
|
|
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 = get_object_item(patch, "value", case_sensitive);
|
|
if (value == NULL)
|
|
{
|
|
/* missing "value" for add/replace. */
|
|
status = 7;
|
|
goto cleanup;
|
|
}
|
|
|
|
value = cJSON_Duplicate(value, 1);
|
|
if (value == NULL)
|
|
{
|
|
/* out of memory for add/replace. */
|
|
status = 8;
|
|
goto cleanup;
|
|
}
|
|
|
|
overwrite_item(object, *value);
|
|
|
|
/* delete the duplicated value */
|
|
cJSON_free(value);
|
|
value = NULL;
|
|
|
|
/* the string "value" isn't needed */
|
|
if (object->string != NULL)
|
|
{
|
|
cJSON_free(object->string);
|
|
object->string = NULL;
|
|
}
|
|
|
|
status = 0;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if ((opcode == REMOVE) || (opcode == REPLACE))
|
|
{
|
|
/* Get rid of old. */
|
|
cJSON *old_item = detach_path(object, (unsigned char*)path->valuestring, case_sensitive);
|
|
if (old_item == NULL)
|
|
{
|
|
status = 13;
|
|
goto cleanup;
|
|
}
|
|
cJSON_Delete(old_item);
|
|
if (opcode == REMOVE)
|
|
{
|
|
/* For Remove, this job is done. */
|
|
status = 0;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* Copy/Move uses "from". */
|
|
if ((opcode == MOVE) || (opcode == COPY))
|
|
{
|
|
cJSON *from = get_object_item(patch, "from", case_sensitive);
|
|
if (from == NULL)
|
|
{
|
|
/* missing "from" for copy/move. */
|
|
status = 4;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (opcode == MOVE)
|
|
{
|
|
value = detach_path(object, (unsigned char*)from->valuestring, case_sensitive);
|
|
}
|
|
if (opcode == COPY)
|
|
{
|
|
value = get_item_from_pointer(object, from->valuestring, case_sensitive);
|
|
}
|
|
if (value == NULL)
|
|
{
|
|
/* missing "from" for copy/move. */
|
|
status = 5;
|
|
goto cleanup;
|
|
}
|
|
if (opcode == COPY)
|
|
{
|
|
value = cJSON_Duplicate(value, 1);
|
|
}
|
|
if (value == NULL)
|
|
{
|
|
/* out of memory for copy/move. */
|
|
status = 6;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
else /* Add/Replace uses "value". */
|
|
{
|
|
value = get_object_item(patch, "value", case_sensitive);
|
|
if (value == NULL)
|
|
{
|
|
/* missing "value" for add/replace. */
|
|
status = 7;
|
|
goto cleanup;
|
|
}
|
|
value = cJSON_Duplicate(value, 1);
|
|
if (value == NULL)
|
|
{
|
|
/* out of memory for add/replace. */
|
|
status = 8;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* Now, just add "value" to "path". */
|
|
|
|
/* split pointer in parent and child */
|
|
parent_pointer = cJSONUtils_strdup((unsigned char*)path->valuestring);
|
|
if (parent_pointer) {
|
|
child_pointer = (unsigned char*)strrchr((char*)parent_pointer, '/');
|
|
}
|
|
if (child_pointer != NULL)
|
|
{
|
|
child_pointer[0] = '\0';
|
|
child_pointer++;
|
|
}
|
|
parent = get_item_from_pointer(object, (char*)parent_pointer, case_sensitive);
|
|
decode_pointer_inplace(child_pointer);
|
|
|
|
/* add, remove, replace, move, copy, test. */
|
|
if ((parent == NULL) || (child_pointer == NULL))
|
|
{
|
|
/* Couldn't find object to add to. */
|
|
status = 9;
|
|
goto cleanup;
|
|
}
|
|
else if (cJSON_IsArray(parent))
|
|
{
|
|
if (strcmp((char*)child_pointer, "-") == 0)
|
|
{
|
|
cJSON_AddItemToArray(parent, value);
|
|
value = NULL;
|
|
}
|
|
else
|
|
{
|
|
size_t index = 0;
|
|
if (!decode_array_index_from_pointer(child_pointer, &index))
|
|
{
|
|
status = 11;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (!insert_item_in_array(parent, index, value))
|
|
{
|
|
status = 10;
|
|
goto cleanup;
|
|
}
|
|
value = NULL;
|
|
}
|
|
}
|
|
else if (cJSON_IsObject(parent))
|
|
{
|
|
if (case_sensitive)
|
|
{
|
|
cJSON_DeleteItemFromObjectCaseSensitive(parent, (char*)child_pointer);
|
|
}
|
|
else
|
|
{
|
|
cJSON_DeleteItemFromObject(parent, (char*)child_pointer);
|
|
}
|
|
cJSON_AddItemToObject(parent, (char*)child_pointer, value);
|
|
value = NULL;
|
|
}
|
|
else /* parent is not an object */
|
|
{
|
|
/* Couldn't find object to add to. */
|
|
status = 9;
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
if (value != NULL)
|
|
{
|
|
cJSON_Delete(value);
|
|
}
|
|
if (parent_pointer != NULL)
|
|
{
|
|
cJSON_free(parent_pointer);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
CJSON_PUBLIC(int) cJSONUtils_ApplyPatches(cJSON * const object, const cJSON * const patches)
|
|
{
|
|
const cJSON *current_patch = NULL;
|
|
int status = 0;
|
|
|
|
if (!cJSON_IsArray(patches))
|
|
{
|
|
/* malformed patches. */
|
|
return 1;
|
|
}
|
|
|
|
if (patches != NULL)
|
|
{
|
|
current_patch = patches->child;
|
|
}
|
|
|
|
while (current_patch != NULL)
|
|
{
|
|
status = apply_patch(object, current_patch, false);
|
|
if (status != 0)
|
|
{
|
|
return status;
|
|
}
|
|
current_patch = current_patch->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
CJSON_PUBLIC(int) cJSONUtils_ApplyPatchesCaseSensitive(cJSON * const object, const cJSON * const patches)
|
|
{
|
|
const cJSON *current_patch = NULL;
|
|
int status = 0;
|
|
|
|
if (!cJSON_IsArray(patches))
|
|
{
|
|
/* malformed patches. */
|
|
return 1;
|
|
}
|
|
|
|
if (patches != NULL)
|
|
{
|
|
current_patch = patches->child;
|
|
}
|
|
|
|
while (current_patch != NULL)
|
|
{
|
|
status = apply_patch(object, current_patch, true);
|
|
if (status != 0)
|
|
{
|
|
return status;
|
|
}
|
|
current_patch = current_patch->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void compose_patch(cJSON * const patches, const unsigned char * const operation, const unsigned char * const path, const unsigned char *suffix, const cJSON * const value)
|
|
{
|
|
cJSON *patch = NULL;
|
|
|
|
if ((patches == NULL) || (operation == NULL) || (path == NULL))
|
|
{
|
|
return;
|
|
}
|
|
|
|
patch = cJSON_CreateObject();
|
|
if (patch == NULL)
|
|
{
|
|
return;
|
|
}
|
|
cJSON_AddItemToObject(patch, "op", cJSON_CreateString((const char*)operation));
|
|
|
|
if (suffix == NULL)
|
|
{
|
|
cJSON_AddItemToObject(patch, "path", cJSON_CreateString((const char*)path));
|
|
}
|
|
else
|
|
{
|
|
size_t suffix_length = pointer_encoded_length(suffix);
|
|
size_t path_length = strlen((const char*)path);
|
|
unsigned char *full_path = (unsigned char*)cJSON_malloc(path_length + suffix_length + sizeof("/"));
|
|
|
|
sprintf((char*)full_path, "%s/", (const char*)path);
|
|
encode_string_as_pointer(full_path + path_length + 1, suffix);
|
|
|
|
cJSON_AddItemToObject(patch, "path", cJSON_CreateString((const char*)full_path));
|
|
cJSON_free(full_path);
|
|
}
|
|
|
|
if (value != NULL)
|
|
{
|
|
cJSON_AddItemToObject(patch, "value", cJSON_Duplicate(value, 1));
|
|
}
|
|
cJSON_AddItemToArray(patches, patch);
|
|
}
|
|
|
|
CJSON_PUBLIC(void) cJSONUtils_AddPatchToArray(cJSON * const array, const char * const operation, const char * const path, const cJSON * const value)
|
|
{
|
|
compose_patch(array, (const unsigned char*)operation, (const unsigned char*)path, NULL, value);
|
|
}
|
|
|
|
static void create_patches(cJSON * const patches, const unsigned char * const path, cJSON * const from, cJSON * const to, const cJSON_bool case_sensitive)
|
|
{
|
|
if ((from == NULL) || (to == NULL))
|
|
{
|
|
return;
|
|
}
|
|
|
|
if ((from->type & 0xFF) != (to->type & 0xFF))
|
|
{
|
|
compose_patch(patches, (const unsigned char*)"replace", path, 0, to);
|
|
return;
|
|
}
|
|
|
|
switch (from->type & 0xFF)
|
|
{
|
|
case cJSON_Number:
|
|
if ((from->valueint != to->valueint) || !compare_double(from->valuedouble, to->valuedouble))
|
|
{
|
|
compose_patch(patches, (const unsigned char*)"replace", path, NULL, to);
|
|
}
|
|
return;
|
|
|
|
case cJSON_String:
|
|
if (strcmp(from->valuestring, to->valuestring) != 0)
|
|
{
|
|
compose_patch(patches, (const unsigned char*)"replace", path, NULL, to);
|
|
}
|
|
return;
|
|
|
|
case cJSON_Array:
|
|
{
|
|
size_t index = 0;
|
|
cJSON *from_child = from->child;
|
|
cJSON *to_child = to->child;
|
|
unsigned char *new_path = (unsigned char*)cJSON_malloc(strlen((const char*)path) + 20 + sizeof("/")); /* Allow space for 64bit int. log10(2^64) = 20 */
|
|
|
|
/* generate patches for all array elements that exist in both "from" and "to" */
|
|
for (index = 0; (from_child != NULL) && (to_child != NULL); (void)(from_child = from_child->next), (void)(to_child = to_child->next), index++)
|
|
{
|
|
/* check if conversion to unsigned long is valid
|
|
* This should be eliminated at compile time by dead code elimination
|
|
* if size_t is an alias of unsigned long, or if it is bigger */
|
|
if (index > ULONG_MAX)
|
|
{
|
|
cJSON_free(new_path);
|
|
return;
|
|
}
|
|
sprintf((char*)new_path, "%s/%lu", path, (unsigned long)index); /* path of the current array element */
|
|
create_patches(patches, new_path, from_child, to_child, case_sensitive);
|
|
}
|
|
|
|
/* remove leftover elements from 'from' that are not in 'to' */
|
|
for (; (from_child != NULL); (void)(from_child = from_child->next))
|
|
{
|
|
/* check if conversion to unsigned long is valid
|
|
* This should be eliminated at compile time by dead code elimination
|
|
* if size_t is an alias of unsigned long, or if it is bigger */
|
|
if (index > ULONG_MAX)
|
|
{
|
|
cJSON_free(new_path);
|
|
return;
|
|
}
|
|
sprintf((char*)new_path, "%lu", (unsigned long)index);
|
|
compose_patch(patches, (const unsigned char*)"remove", path, new_path, NULL);
|
|
}
|
|
/* add new elements in 'to' that were not in 'from' */
|
|
for (; (to_child != NULL); (void)(to_child = to_child->next), index++)
|
|
{
|
|
compose_patch(patches, (const unsigned char*)"add", path, (const unsigned char*)"-", to_child);
|
|
}
|
|
cJSON_free(new_path);
|
|
return;
|
|
}
|
|
|
|
case cJSON_Object:
|
|
{
|
|
cJSON *from_child = NULL;
|
|
cJSON *to_child = NULL;
|
|
sort_object(from, case_sensitive);
|
|
sort_object(to, case_sensitive);
|
|
|
|
from_child = from->child;
|
|
to_child = to->child;
|
|
/* for all object values in the object with more of them */
|
|
while ((from_child != NULL) || (to_child != NULL))
|
|
{
|
|
int diff;
|
|
if (from_child == NULL)
|
|
{
|
|
diff = 1;
|
|
}
|
|
else if (to_child == NULL)
|
|
{
|
|
diff = -1;
|
|
}
|
|
else
|
|
{
|
|
diff = compare_strings((unsigned char*)from_child->string, (unsigned char*)to_child->string, case_sensitive);
|
|
}
|
|
|
|
if (diff == 0)
|
|
{
|
|
/* both object keys are the same */
|
|
size_t path_length = strlen((const char*)path);
|
|
size_t from_child_name_length = pointer_encoded_length((unsigned char*)from_child->string);
|
|
unsigned char *new_path = (unsigned char*)cJSON_malloc(path_length + from_child_name_length + sizeof("/"));
|
|
|
|
sprintf((char*)new_path, "%s/", path);
|
|
encode_string_as_pointer(new_path + path_length + 1, (unsigned char*)from_child->string);
|
|
|
|
/* create a patch for the element */
|
|
create_patches(patches, new_path, from_child, to_child, case_sensitive);
|
|
cJSON_free(new_path);
|
|
|
|
from_child = from_child->next;
|
|
to_child = to_child->next;
|
|
}
|
|
else if (diff < 0)
|
|
{
|
|
/* object element doesn't exist in 'to' --> remove it */
|
|
compose_patch(patches, (const unsigned char*)"remove", path, (unsigned char*)from_child->string, NULL);
|
|
|
|
from_child = from_child->next;
|
|
}
|
|
else
|
|
{
|
|
/* object element doesn't exist in 'from' --> add it */
|
|
compose_patch(patches, (const unsigned char*)"add", path, (unsigned char*)to_child->string, to_child);
|
|
|
|
to_child = to_child->next;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatches(cJSON * const from, cJSON * const to)
|
|
{
|
|
cJSON *patches = NULL;
|
|
|
|
if ((from == NULL) || (to == NULL))
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
patches = cJSON_CreateArray();
|
|
create_patches(patches, (const unsigned char*)"", from, to, false);
|
|
|
|
return patches;
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatchesCaseSensitive(cJSON * const from, cJSON * const to)
|
|
{
|
|
cJSON *patches = NULL;
|
|
|
|
if ((from == NULL) || (to == NULL))
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
patches = cJSON_CreateArray();
|
|
create_patches(patches, (const unsigned char*)"", from, to, true);
|
|
|
|
return patches;
|
|
}
|
|
|
|
CJSON_PUBLIC(void) cJSONUtils_SortObject(cJSON * const object)
|
|
{
|
|
sort_object(object, false);
|
|
}
|
|
|
|
CJSON_PUBLIC(void) cJSONUtils_SortObjectCaseSensitive(cJSON * const object)
|
|
{
|
|
sort_object(object, true);
|
|
}
|
|
|
|
static cJSON *merge_patch(cJSON *target, const cJSON * const patch, const cJSON_bool case_sensitive)
|
|
{
|
|
cJSON *patch_child = NULL;
|
|
|
|
if (!cJSON_IsObject(patch))
|
|
{
|
|
/* scalar value, array or NULL, just duplicate */
|
|
cJSON_Delete(target);
|
|
return cJSON_Duplicate(patch, 1);
|
|
}
|
|
|
|
if (!cJSON_IsObject(target))
|
|
{
|
|
cJSON_Delete(target);
|
|
target = cJSON_CreateObject();
|
|
}
|
|
|
|
patch_child = patch->child;
|
|
while (patch_child != NULL)
|
|
{
|
|
if (cJSON_IsNull(patch_child))
|
|
{
|
|
/* NULL is the indicator to remove a value, see RFC7396 */
|
|
if (case_sensitive)
|
|
{
|
|
cJSON_DeleteItemFromObjectCaseSensitive(target, patch_child->string);
|
|
}
|
|
else
|
|
{
|
|
cJSON_DeleteItemFromObject(target, patch_child->string);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
cJSON *replace_me = NULL;
|
|
cJSON *replacement = NULL;
|
|
|
|
if (case_sensitive)
|
|
{
|
|
replace_me = cJSON_DetachItemFromObjectCaseSensitive(target, patch_child->string);
|
|
}
|
|
else
|
|
{
|
|
replace_me = cJSON_DetachItemFromObject(target, patch_child->string);
|
|
}
|
|
|
|
replacement = merge_patch(replace_me, patch_child, case_sensitive);
|
|
if (replacement == NULL)
|
|
{
|
|
cJSON_Delete(target);
|
|
return NULL;
|
|
}
|
|
|
|
cJSON_AddItemToObject(target, patch_child->string, replacement);
|
|
}
|
|
patch_child = patch_child->next;
|
|
}
|
|
return target;
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_MergePatch(cJSON *target, const cJSON * const patch)
|
|
{
|
|
return merge_patch(target, patch, false);
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_MergePatchCaseSensitive(cJSON *target, const cJSON * const patch)
|
|
{
|
|
return merge_patch(target, patch, true);
|
|
}
|
|
|
|
static cJSON *generate_merge_patch(cJSON * const from, cJSON * const to, const cJSON_bool case_sensitive)
|
|
{
|
|
cJSON *from_child = NULL;
|
|
cJSON *to_child = NULL;
|
|
cJSON *patch = NULL;
|
|
if (to == NULL)
|
|
{
|
|
/* patch to delete everything */
|
|
return cJSON_CreateNull();
|
|
}
|
|
if (!cJSON_IsObject(to) || !cJSON_IsObject(from))
|
|
{
|
|
return cJSON_Duplicate(to, 1);
|
|
}
|
|
|
|
sort_object(from, case_sensitive);
|
|
sort_object(to, case_sensitive);
|
|
|
|
from_child = from->child;
|
|
to_child = to->child;
|
|
patch = cJSON_CreateObject();
|
|
if (patch == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
while (from_child || to_child)
|
|
{
|
|
int diff;
|
|
if (from_child != NULL)
|
|
{
|
|
if (to_child != NULL)
|
|
{
|
|
diff = strcmp(from_child->string, to_child->string);
|
|
}
|
|
else
|
|
{
|
|
diff = -1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
diff = 1;
|
|
}
|
|
|
|
if (diff < 0)
|
|
{
|
|
/* from has a value that to doesn't have -> remove */
|
|
cJSON_AddItemToObject(patch, from_child->string, cJSON_CreateNull());
|
|
|
|
from_child = from_child->next;
|
|
}
|
|
else if (diff > 0)
|
|
{
|
|
/* to has a value that from doesn't have -> add to patch */
|
|
cJSON_AddItemToObject(patch, to_child->string, cJSON_Duplicate(to_child, 1));
|
|
|
|
to_child = to_child->next;
|
|
}
|
|
else
|
|
{
|
|
/* object key exists in both objects */
|
|
if (!compare_json(from_child, to_child, case_sensitive))
|
|
{
|
|
/* not identical --> generate a patch */
|
|
cJSON_AddItemToObject(patch, to_child->string, cJSONUtils_GenerateMergePatch(from_child, to_child));
|
|
}
|
|
|
|
/* next key in the object */
|
|
from_child = from_child->next;
|
|
to_child = to_child->next;
|
|
}
|
|
}
|
|
if (patch->child == NULL)
|
|
{
|
|
/* no patch generated */
|
|
cJSON_Delete(patch);
|
|
return NULL;
|
|
}
|
|
|
|
return patch;
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_GenerateMergePatch(cJSON * const from, cJSON * const to)
|
|
{
|
|
return generate_merge_patch(from, to, false);
|
|
}
|
|
|
|
CJSON_PUBLIC(cJSON *) cJSONUtils_GenerateMergePatchCaseSensitive(cJSON * const from, cJSON * const to)
|
|
{
|
|
return generate_merge_patch(from, to, true);
|
|
}
|