freeswitch/src/mod/applications/mod_http/json_object.c

/*
 * $Id: json_object.c,v 1.17 2006/07/25 03:24:50 mclark Exp $
 *
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "debug.h"
#include "printbuf.h"
#include "linkhash.h"
#include "arraylist.h"
#include "json_object.h"
#include "json_object_private.h"
#include "json_tokener.h"

#if !HAVE_STRNDUP

char *strndup(const char *str, size_t n);

#endif /* !HAVE_STRNDUP */

/* #define REFCOUNT_DEBUG 1 */

char *json_number_chars = "0123456789.+-e";
char *json_hex_chars = "0123456789abcdef";

#ifdef REFCOUNT_DEBUG
static char *json_type_name[] = {
	"null",
	"boolean",
	"double",
	"int",
	"object",
	"array",
	"string",
};
#endif /* REFCOUNT_DEBUG */

static void json_object_generic_delete(struct json_object *this);
static struct json_object *json_object_new(enum json_type o_type);


/* ref count debugging */

#ifdef REFCOUNT_DEBUG

static struct lh_table *json_object_table;

static void json_object_init() __attribute__ ((constructor));
static void json_object_init()
{
	mc_debug("json_object_init: creating object table\n");
	json_object_table = lh_kptr_table_new(128, "json_object_table", NULL);
}

static void json_object_fini() __attribute__ ((destructor));
static void json_object_fini()
{
	struct lh_entry *ent;
	if (mc_get_debug() && json_object_table->count) {
		mc_debug("json_object_fini: %d referenced objects at exit\n", json_object_table->count);
		lh_foreach(json_object_table, ent) {
			struct json_object *obj = (struct json_object *) ent->v;
			mc_debug("\t%s:%p\n", json_type_name[obj->o_type], obj);
		}
	}
	mc_debug("json_object_fini: freeing object table\n");
	lh_table_free(json_object_table);
}
#endif /* REFCOUNT_DEBUG */


/* string escaping */

static int json_escape_str(struct printbuf *pb, char *str)
{
	int pos = 0, start_offset = 0;
	unsigned char c;
	do {
		c = str[pos];
		switch (c) {
		case '\0':
			break;
		case '\b':
		case '\n':
		case '\r':
		case '\t':
		case '"':
		case '\\':
		case '/':
			if (pos - start_offset > 0)
				printbuf_memappend(pb, str + start_offset, pos - start_offset);
			if (c == '\b')
				printbuf_memappend(pb, "\\b", 2);
			else if (c == '\n')
				printbuf_memappend(pb, "\\n", 2);
			else if (c == '\r')
				printbuf_memappend(pb, "\\r", 2);
			else if (c == '\t')
				printbuf_memappend(pb, "\\t", 2);
			else if (c == '"')
				printbuf_memappend(pb, "\\\"", 2);
			else if (c == '\\')
				printbuf_memappend(pb, "\\\\", 2);
			else if (c == '/')
				printbuf_memappend(pb, "\\/", 2);
			start_offset = ++pos;
			break;
		default:
			if (c < ' ') {
				if (pos - start_offset > 0)
					printbuf_memappend(pb, str + start_offset, pos - start_offset);
				sprintbuf(pb, "\\u00%c%c", json_hex_chars[c >> 4], json_hex_chars[c & 0xf]);
				start_offset = ++pos;
			} else
				pos++;
		}
	} while (c);
	if (pos - start_offset > 0)
		printbuf_memappend(pb, str + start_offset, pos - start_offset);
	return 0;
}


/* reference counting */

extern struct json_object *json_object_get(struct json_object *this)
{
	if (this) {
		this->_ref_count++;
	}
	return this;
}

extern void json_object_put(struct json_object *this)
{
	if (this) {
		this->_ref_count--;
		if (!this->_ref_count)
			this->_delete(this);
	}
}


/* generic object construction and destruction parts */

static void json_object_generic_delete(struct json_object *this)
{
#ifdef REFCOUNT_DEBUG
	mc_debug("json_object_delete_%s: %p\n", json_type_name[this->o_type], this);
	lh_table_delete(json_object_table, this);
#endif /* REFCOUNT_DEBUG */
	printbuf_free(this->_pb);
	free(this);
}

static struct json_object *json_object_new(enum json_type o_type)
{
	struct json_object *this = calloc(sizeof(struct json_object), 1);
	if (!this)
		return NULL;
	this->o_type = o_type;
	this->_ref_count = 1;
	this->_delete = &json_object_generic_delete;
#ifdef REFCOUNT_DEBUG
	lh_table_insert(json_object_table, this, this);
	mc_debug("json_object_new_%s: %p\n", json_type_name[this->o_type], this);
#endif /* REFCOUNT_DEBUG */
	return this;
}


/* type checking functions */

int json_object_is_type(struct json_object *this, enum json_type type)
{
	return (this->o_type == type);
}

enum json_type json_object_get_type(struct json_object *this)
{
	return this->o_type;
}


/* json_object_to_json_string */

char *json_object_to_json_string(struct json_object *this)
{
	if (!this)
		return "null";
	if (!this->_pb) {
		if (!(this->_pb = printbuf_new()))
			return NULL;
	} else {
		printbuf_reset(this->_pb);
	}
	if (this->_to_json_string(this, this->_pb) < 0)
		return NULL;
	return this->_pb->buf;
}


/* json_object_object */

static int json_object_object_to_json_string(struct json_object *this, struct printbuf *pb)
{
	int i = 0;
	struct json_object_iter iter;
	sprintbuf(pb, "{");

	/* CAW: scope operator to make ANSI correctness */
	/* CAW: switched to json_object_object_foreachC which uses an iterator struct */
	json_object_object_foreachC(this, iter) {
		if (i)
			sprintbuf(pb, ",");
		sprintbuf(pb, " \"");
		json_escape_str(pb, iter.key);
		sprintbuf(pb, "\": ");
		if (iter.val == NULL)
			sprintbuf(pb, "null");
		else
			iter.val->_to_json_string(iter.val, pb);
		i++;
	}

	return sprintbuf(pb, " }");
}

static void json_object_lh_entry_free(struct lh_entry *ent)
{
	free(ent->k);
	json_object_put((struct json_object *) ent->v);
}

static void json_object_object_delete(struct json_object *this)
{
	lh_table_free(this->o.c_object);
	json_object_generic_delete(this);
}

struct json_object *json_object_new_object()
{
	struct json_object *this = json_object_new(json_type_object);
	if (!this)
		return NULL;
	this->_delete = &json_object_object_delete;
	this->_to_json_string = &json_object_object_to_json_string;
	this->o.c_object = lh_kchar_table_new(JSON_OBJECT_DEF_HASH_ENTIRES, NULL, &json_object_lh_entry_free);
	return this;
}

struct lh_table *json_object_get_object(struct json_object *this)
{
	if (!this)
		return NULL;
	switch (this->o_type) {
	case json_type_object:
		return this->o.c_object;
	default:
		return NULL;
	}
}

void json_object_object_add(struct json_object *this, char *key, struct json_object *val)
{
	lh_table_delete(this->o.c_object, key);
	lh_table_insert(this->o.c_object, strdup(key), val);
}

struct json_object *json_object_object_get(struct json_object *this, char *key)
{
	return (struct json_object *) lh_table_lookup(this->o.c_object, key);
}

void json_object_object_del(struct json_object *this, char *key)
{
	lh_table_delete(this->o.c_object, key);
}


/* json_object_boolean */

static int json_object_boolean_to_json_string(struct json_object *this, struct printbuf *pb)
{
	if (this->o.c_boolean)
		return sprintbuf(pb, "true");
	else
		return sprintbuf(pb, "false");
}

struct json_object *json_object_new_boolean(boolean b)
{
	struct json_object *this = json_object_new(json_type_boolean);
	if (!this)
		return NULL;
	this->_to_json_string = &json_object_boolean_to_json_string;
	this->o.c_boolean = b;
	return this;
}

boolean json_object_get_boolean(struct json_object * this)
{
	if (!this)
		return FALSE;
	switch (this->o_type) {
	case json_type_boolean:
		return this->o.c_boolean;
	case json_type_int:
		return (this->o.c_int != 0);
	case json_type_double:
		return (this->o.c_double != 0);
	case json_type_string:
		if (strlen(this->o.c_string))
			return TRUE;
	default:
		return TRUE;
	}
}


/* json_object_int */

static int json_object_int_to_json_string(struct json_object *this, struct printbuf *pb)
{
	return sprintbuf(pb, "%d", this->o.c_int);
}

struct json_object *json_object_new_int(int i)
{
	struct json_object *this = json_object_new(json_type_int);
	if (!this)
		return NULL;
	this->_to_json_string = &json_object_int_to_json_string;
	this->o.c_int = i;
	return this;
}

int json_object_get_int(struct json_object *this)
{
	int cint;

	if (!this)
		return 0;
	switch (this->o_type) {
	case json_type_int:
		return this->o.c_int;
	case json_type_double:
		return (int) this->o.c_double;
	case json_type_boolean:
		return this->o.c_boolean;
	case json_type_string:
		if (sscanf(this->o.c_string, "%d", &cint) == 1)
			return cint;
	default:
		return 0;
	}
}


/* json_object_double */

static int json_object_double_to_json_string(struct json_object *this, struct printbuf *pb)
{
	return sprintbuf(pb, "%lf", this->o.c_double);
}

struct json_object *json_object_new_double(double d)
{
	struct json_object *this = json_object_new(json_type_double);
	if (!this)
		return NULL;
	this->_to_json_string = &json_object_double_to_json_string;
	this->o.c_double = d;
	return this;
}

double json_object_get_double(struct json_object *this)
{
	double cdouble;

	if (!this)
		return 0.0;
	switch (this->o_type) {
	case json_type_double:
		return this->o.c_double;
	case json_type_int:
		return this->o.c_int;
	case json_type_boolean:
		return this->o.c_boolean;
	case json_type_string:
		if (sscanf(this->o.c_string, "%lf", &cdouble) == 1)
			return cdouble;
	default:
		return 0.0;
	}
}


/* json_object_string */

static int json_object_string_to_json_string(struct json_object *this, struct printbuf *pb)
{
	sprintbuf(pb, "\"");
	json_escape_str(pb, this->o.c_string);
	sprintbuf(pb, "\"");
	return 0;
}

static void json_object_string_delete(struct json_object *this)
{
	free(this->o.c_string);
	json_object_generic_delete(this);
}

struct json_object *json_object_new_string(char *s)
{
	struct json_object *this = json_object_new(json_type_string);
	if (!this)
		return NULL;
	this->_delete = &json_object_string_delete;
	this->_to_json_string = &json_object_string_to_json_string;
	this->o.c_string = strdup(s);
	return this;
}

struct json_object *json_object_new_string_len(char *s, int len)
{
	struct json_object *this = json_object_new(json_type_string);
	if (!this)
		return NULL;
	this->_delete = &json_object_string_delete;
	this->_to_json_string = &json_object_string_to_json_string;
	this->o.c_string = strndup(s, len);
	return this;
}

char *json_object_get_string(struct json_object *this)
{
	if (!this)
		return NULL;
	switch (this->o_type) {
	case json_type_string:
		return this->o.c_string;
	default:
		return json_object_to_json_string(this);
	}
}


/* json_object_array */

static int json_object_array_to_json_string(struct json_object *this, struct printbuf *pb)
{
	int i;
	sprintbuf(pb, "[");
	for (i = 0; i < json_object_array_length(this); i++) {
		struct json_object *val;
		if (i) {
			sprintbuf(pb, ", ");
		} else {
			sprintbuf(pb, " ");
		}

		val = json_object_array_get_idx(this, i);
		if (val == NULL) {
			sprintbuf(pb, "null");
		} else {
			val->_to_json_string(val, pb);
		}
	}
	return sprintbuf(pb, " ]");
}

static void json_object_array_entry_free(void *data)
{
	json_object_put((struct json_object *) data);
}

static void json_object_array_delete(struct json_object *this)
{
	array_list_free(this->o.c_array);
	json_object_generic_delete(this);
}

struct json_object *json_object_new_array()
{
	struct json_object *this = json_object_new(json_type_array);
	if (!this)
		return NULL;
	this->_delete = &json_object_array_delete;
	this->_to_json_string = &json_object_array_to_json_string;
	this->o.c_array = array_list_new(&json_object_array_entry_free);
	return this;
}

struct array_list *json_object_get_array(struct json_object *this)
{
	if (!this)
		return NULL;
	switch (this->o_type) {
	case json_type_array:
		return this->o.c_array;
	default:
		return NULL;
	}
}

int json_object_array_length(struct json_object *this)
{
	return array_list_length(this->o.c_array);
}

int json_object_array_add(struct json_object *this, struct json_object *val)
{
	return array_list_add(this->o.c_array, val);
}

int json_object_array_put_idx(struct json_object *this, int idx, struct json_object *val)
{
	return array_list_put_idx(this->o.c_array, idx, val);
}

struct json_object *json_object_array_get_idx(struct json_object *this, int idx)
{
	return (struct json_object *) array_list_get_idx(this->o.c_array, idx);
}