/*
  +----------------------------------------------------------------------+
  | PHP Version 7                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2014 The PHP Group                                |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Omar Kilani <omar@php.net>                                   |
  +----------------------------------------------------------------------+
*/

/* $Id$ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "ext/standard/html.h"
#include "zend_smart_str.h"
#include "php_json.h"
#include <zend_exceptions.h>

static void json_escape_string(smart_str *buf, char *s, size_t len, int options TSRMLS_DC);

static int json_determine_array_type(zval *val TSRMLS_DC) /* {{{ */
{
	int i;
	HashTable *myht = HASH_OF(val);

	i = myht ? zend_hash_num_elements(myht) : 0;
	if (i > 0) {
		zend_string *key;
		zend_ulong index, idx;

		idx = 0;
		ZEND_HASH_FOREACH_KEY(myht, index, key) {
			if (key) {
				return PHP_JSON_OUTPUT_OBJECT;
			} else {
				if (index != idx) {
					return PHP_JSON_OUTPUT_OBJECT;
				}
			}
			idx++;
		} ZEND_HASH_FOREACH_END();
	}

	return PHP_JSON_OUTPUT_ARRAY;
}
/* }}} */

/* {{{ Pretty printing support functions */

static inline void json_pretty_print_char(smart_str *buf, int options, char c TSRMLS_DC) /* {{{ */
{
	if (options & PHP_JSON_PRETTY_PRINT) {
		smart_str_appendc(buf, c);
	}
}
/* }}} */

static inline void json_pretty_print_indent(smart_str *buf, int options TSRMLS_DC) /* {{{ */
{
	int i;

	if (options & PHP_JSON_PRETTY_PRINT) {
		for (i = 0; i < JSON_G(encoder_depth); ++i) {
			smart_str_appendl(buf, "    ", 4);
		}
	}
}
/* }}} */

/* }}} */

static void json_encode_array(smart_str *buf, zval *val, int options TSRMLS_DC) /* {{{ */
{
	int i, r, need_comma = 0;
	HashTable *myht;

	if (Z_TYPE_P(val) == IS_ARRAY) {
		myht = HASH_OF(val);
		r = (options & PHP_JSON_FORCE_OBJECT) ? PHP_JSON_OUTPUT_OBJECT : json_determine_array_type(val TSRMLS_CC);
	} else {
		myht = Z_OBJPROP_P(val);
		r = PHP_JSON_OUTPUT_OBJECT;
	}

	if (myht && ZEND_HASH_GET_APPLY_COUNT(myht) > 1) {
		JSON_G(error_code) = PHP_JSON_ERROR_RECURSION;
		smart_str_appendl(buf, "null", 4);
		return;
	}

	if (r == PHP_JSON_OUTPUT_ARRAY) {
		smart_str_appendc(buf, '[');
	} else {
		smart_str_appendc(buf, '{');
	}

	++JSON_G(encoder_depth);

	i = myht ? zend_hash_num_elements(myht) : 0;

	if (i > 0) {
		zend_string *key;
		zval *data;
		zend_ulong index;
		HashTable *tmp_ht;

		ZEND_HASH_FOREACH_KEY_VAL_IND(myht, index, key, data) {
			ZVAL_DEREF(data);
			tmp_ht = HASH_OF(data);
			if (tmp_ht && ZEND_HASH_APPLY_PROTECTION(tmp_ht)) {
				ZEND_HASH_INC_APPLY_COUNT(tmp_ht);
			}

			if (r == PHP_JSON_OUTPUT_ARRAY) {
				if (need_comma) {
					smart_str_appendc(buf, ',');
				} else {
					need_comma = 1;
				}

				json_pretty_print_char(buf, options, '\n' TSRMLS_CC);
				json_pretty_print_indent(buf, options TSRMLS_CC);
				php_json_encode(buf, data, options TSRMLS_CC);
			} else if (r == PHP_JSON_OUTPUT_OBJECT) {
				if (key) {
					if (key->val[0] == '\0' && Z_TYPE_P(val) == IS_OBJECT) {
						/* Skip protected and private members. */
						if (tmp_ht && ZEND_HASH_APPLY_PROTECTION(tmp_ht)) {
							ZEND_HASH_DEC_APPLY_COUNT(tmp_ht);
						}
						continue;
					}

					if (need_comma) {
						smart_str_appendc(buf, ',');
					} else {
						need_comma = 1;
					}

					json_pretty_print_char(buf, options, '\n' TSRMLS_CC);
					json_pretty_print_indent(buf, options TSRMLS_CC);

					json_escape_string(buf, key->val, key->len, options & ~PHP_JSON_NUMERIC_CHECK TSRMLS_CC);
					smart_str_appendc(buf, ':');

					json_pretty_print_char(buf, options, ' ' TSRMLS_CC);

					php_json_encode(buf, data, options TSRMLS_CC);
				} else {
					if (need_comma) {
						smart_str_appendc(buf, ',');
					} else {
						need_comma = 1;
					}

					json_pretty_print_char(buf, options, '\n' TSRMLS_CC);
					json_pretty_print_indent(buf, options TSRMLS_CC);

					smart_str_appendc(buf, '"');
					smart_str_append_long(buf, (zend_long) index);
					smart_str_appendc(buf, '"');
					smart_str_appendc(buf, ':');

					json_pretty_print_char(buf, options, ' ' TSRMLS_CC);

					php_json_encode(buf, data, options TSRMLS_CC);
				}
			}

			if (tmp_ht && ZEND_HASH_APPLY_PROTECTION(tmp_ht)) {
				ZEND_HASH_DEC_APPLY_COUNT(tmp_ht);
			}
		} ZEND_HASH_FOREACH_END();
	}

	if (JSON_G(encoder_depth) > JSON_G(encode_max_depth)) {
		JSON_G(error_code) = PHP_JSON_ERROR_DEPTH;
	}
	--JSON_G(encoder_depth);

	/* Only keep closing bracket on same line for empty arrays/objects */
	if (need_comma) {
		json_pretty_print_char(buf, options, '\n' TSRMLS_CC);
		json_pretty_print_indent(buf, options TSRMLS_CC);
	}

	if (r == PHP_JSON_OUTPUT_ARRAY) {
		smart_str_appendc(buf, ']');
	} else {
		smart_str_appendc(buf, '}');
	}
}
/* }}} */

static int json_utf8_to_utf16(unsigned short *utf16, char utf8[], int len) /* {{{ */
{
	size_t pos = 0, us;
	int j, status;

	if (utf16) {
		/* really convert the utf8 string */
		for (j=0 ; pos < len ; j++) {
			us = php_next_utf8_char((const unsigned char *)utf8, len, &pos, &status);
			if (status != SUCCESS) {
				return -1;
			}
			/* From http://en.wikipedia.org/wiki/UTF16 */
			if (us >= 0x10000) {
				us -= 0x10000;
				utf16[j++] = (unsigned short)((us >> 10) | 0xd800);
				utf16[j] = (unsigned short)((us & 0x3ff) | 0xdc00);
			} else {
				utf16[j] = (unsigned short)us;
			}
		}
	} else {
		/* Only check if utf8 string is valid, and compute utf16 length */
		for (j=0 ; pos < len ; j++) {
			us = php_next_utf8_char((const unsigned char *)utf8, len, &pos, &status);
			if (status != SUCCESS) {
				return -1;
			}
			if (us >= 0x10000) {
				j++;
			}
		}
	}
	return j;
}
/* }}} */

static void json_escape_string(smart_str *buf, char *s, size_t len, int options TSRMLS_DC) /* {{{ */
{
	int status;
	unsigned int us, next_us = 0;
	size_t pos, checkpoint;

	if (len == 0) {
		smart_str_appendl(buf, "\"\"", 2);
		return;
	}

	if (options & PHP_JSON_NUMERIC_CHECK) {
		double d;
		int type;
		zend_long p;

		if ((type = is_numeric_string(s, len, &p, &d, 0)) != 0) {
			if (type == IS_LONG) {
				smart_str_append_long(buf, p);
			} else if (type == IS_DOUBLE) {
				if (!zend_isinf(d) && !zend_isnan(d)) {
					char *tmp;
					int l = spprintf(&tmp, 0, "%.*k", (int) EG(precision), d);
					smart_str_appendl(buf, tmp, l);
					efree(tmp);
				} else {
					JSON_G(error_code) = PHP_JSON_ERROR_INF_OR_NAN;
					smart_str_appendc(buf, '0');
				}
			}
			return;
		}

	}

	if (options & PHP_JSON_UNESCAPED_UNICODE) {
		/* validate UTF-8 string first */
		if (json_utf8_to_utf16(NULL, s, len) < 0) {
			JSON_G(error_code) = PHP_JSON_ERROR_UTF8;
			smart_str_appendl(buf, "null", 4);
			return;			
		}
	}

	pos = 0;
	checkpoint = buf->s ? buf->s->len : 0;

	/* pre-allocate for string length plus 2 quotes */
	smart_str_alloc(buf, len+2, 0);
	smart_str_appendc(buf, '"');

	do {
		if (UNEXPECTED(next_us)) {
			us = next_us;
			next_us = 0;
		} else {
			us = (unsigned char)s[pos];
			if (!(options & PHP_JSON_UNESCAPED_UNICODE) && us >= 0x80) {
				/* UTF-8 character */
				us = php_next_utf8_char((const unsigned char *)s, len, &pos, &status);
				if (status != SUCCESS) {
					if (buf->s) {
						buf->s->len = checkpoint;
					}
					JSON_G(error_code) = PHP_JSON_ERROR_UTF8;
					smart_str_appendl(buf, "null", 4);
					return;
				}
				/* From http://en.wikipedia.org/wiki/UTF16 */
				if (us >= 0x10000) {
					us -= 0x10000;
					next_us = (unsigned short)((us & 0x3ff) | 0xdc00);
					us = (unsigned short)((us >> 10) | 0xd800);
				}
			} else {
				pos++;
			}
		}

		switch (us) {
			case '"':
				if (options & PHP_JSON_HEX_QUOT) {
					smart_str_appendl(buf, "\\u0022", 6);
				} else {
					smart_str_appendl(buf, "\\\"", 2);
				}
				break;

			case '\\':
				smart_str_appendl(buf, "\\\\", 2);
				break;

			case '/':
				if (options & PHP_JSON_UNESCAPED_SLASHES) {
					smart_str_appendc(buf, '/');
				} else {
					smart_str_appendl(buf, "\\/", 2);
				}
				break;

			case '\b':
				smart_str_appendl(buf, "\\b", 2);
				break;

			case '\f':
				smart_str_appendl(buf, "\\f", 2);
				break;

			case '\n':
				smart_str_appendl(buf, "\\n", 2);
				break;

			case '\r':
				smart_str_appendl(buf, "\\r", 2);
				break;

			case '\t':
				smart_str_appendl(buf, "\\t", 2);
				break;

			case '<':
				if (options & PHP_JSON_HEX_TAG) {
					smart_str_appendl(buf, "\\u003C", 6);
				} else {
					smart_str_appendc(buf, '<');
				}
				break;

			case '>':
				if (options & PHP_JSON_HEX_TAG) {
					smart_str_appendl(buf, "\\u003E", 6);
				} else {
					smart_str_appendc(buf, '>');
				}
				break;

			case '&':
				if (options & PHP_JSON_HEX_AMP) {
					smart_str_appendl(buf, "\\u0026", 6);
				} else {
					smart_str_appendc(buf, '&');
				}
				break;

			case '\'':
				if (options & PHP_JSON_HEX_APOS) {
					smart_str_appendl(buf, "\\u0027", 6);
				} else {
					smart_str_appendc(buf, '\'');
				}
				break;

			default:
				if (us >= ' ' && ((options & PHP_JSON_UNESCAPED_UNICODE) || (us & 127) == us)) {
					smart_str_appendc(buf, (unsigned char) us);
				} else {
					smart_str_appendl(buf, "\\u", 2);
					smart_str_appendc(buf, digits[(us & 0xf000) >> 12]);
					smart_str_appendc(buf, digits[(us & 0xf00)  >> 8]);
					smart_str_appendc(buf, digits[(us & 0xf0)   >> 4]);
					smart_str_appendc(buf, digits[(us & 0xf)]);
				}
				break;
		}
	} while (pos < len || next_us);
	
	smart_str_appendc(buf, '"');
}
/* }}} */

static void json_encode_serializable_object(smart_str *buf, zval *val, int options TSRMLS_DC) /* {{{ */
{
	zend_class_entry *ce = Z_OBJCE_P(val);
	zval retval, fname;
	HashTable* myht;

	if (Z_TYPE_P(val) == IS_ARRAY) {
		myht = HASH_OF(val);
	} else {
		myht = Z_OBJPROP_P(val);
	}

	if (myht && ZEND_HASH_GET_APPLY_COUNT(myht) > 1) {
		JSON_G(error_code) = PHP_JSON_ERROR_RECURSION;
		smart_str_appendl(buf, "null", 4);
		return;
	}

	ZVAL_STRING(&fname, "jsonSerialize");

	if (FAILURE == call_user_function_ex(EG(function_table), val, &fname, &retval, 0, NULL, 1, NULL TSRMLS_CC) || Z_TYPE(retval) == IS_UNDEF) {
		zend_throw_exception_ex(NULL, 0 TSRMLS_CC, "Failed calling %s::jsonSerialize()", ce->name->val);
		smart_str_appendl(buf, "null", sizeof("null") - 1);
		zval_ptr_dtor(&fname);
		return;
    }

	if (EG(exception)) {
		/* Error already raised */
		zval_ptr_dtor(&retval);
		zval_ptr_dtor(&fname);
		smart_str_appendl(buf, "null", sizeof("null") - 1);
		return;
	}

	if ((Z_TYPE(retval) == IS_OBJECT) &&
		(Z_OBJ_HANDLE(retval) == Z_OBJ_HANDLE_P(val))) {
		/* Handle the case where jsonSerialize does: return $this; by going straight to encode array */
		json_encode_array(buf, &retval, options TSRMLS_CC);
	} else {
		/* All other types, encode as normal */
		php_json_encode(buf, &retval, options TSRMLS_CC);
	}

	zval_ptr_dtor(&retval);
	zval_ptr_dtor(&fname);
}
/* }}} */

void php_json_encode_zval(smart_str *buf, zval *val, int options TSRMLS_DC) /* {{{ */
{
again:
	switch (Z_TYPE_P(val))
	{
		case IS_NULL:
			smart_str_appendl(buf, "null", 4);
			break;

		case IS_TRUE:
			smart_str_appendl(buf, "true", 4);
			break;
		case IS_FALSE:
			smart_str_appendl(buf, "false", 5);
			break;

		case IS_LONG:
			smart_str_append_long(buf, Z_LVAL_P(val));
			break;

		case IS_DOUBLE:
			{
				char *d = NULL;
				int len;
				double dbl = Z_DVAL_P(val);

				if (!zend_isinf(dbl) && !zend_isnan(dbl)) {
					len = spprintf(&d, 0, "%.*k", (int) EG(precision), dbl);
					smart_str_appendl(buf, d, len);
					efree(d);
				} else {
					JSON_G(error_code) = PHP_JSON_ERROR_INF_OR_NAN;
					smart_str_appendc(buf, '0');
				}
			}
			break;

		case IS_STRING:
			json_escape_string(buf, Z_STRVAL_P(val), Z_STRLEN_P(val), options TSRMLS_CC);
			break;

		case IS_OBJECT:
			if (instanceof_function(Z_OBJCE_P(val), php_json_serializable_ce TSRMLS_CC)) {
				json_encode_serializable_object(buf, val, options TSRMLS_CC);
				break;
			}
			/* fallthrough -- Non-serializable object */
		case IS_ARRAY:
			json_encode_array(buf, val, options TSRMLS_CC);
			break;

		case IS_REFERENCE:
			val = Z_REFVAL_P(val);
			goto again;

		default:
			JSON_G(error_code) = PHP_JSON_ERROR_UNSUPPORTED_TYPE;
			smart_str_appendl(buf, "null", 4);
			break;
	}

	return;
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet sw=4 ts=4 fdm=marker
 * vim<600: noet sw=4 ts=4
 */