Introduce json encoder to fix globals related issues

It fixes bugs #66025 and #73254 by replacing globals with
a passed structure holding depth and error code. In addition
it fixes #72069 in a more generic way.

NEWS

@@ -10,6 +10,10 @@ PHP                                                                        NEWS
   . Fixed bug #73392 (A use-after-free in zend allocator management). 
     (Laruence)
 
+- JSON:
+  . Introduced encoder struct instead of global which fixes bugs #66025 and
+    #73254 related to pretty print indentation. (Jakub Zelenka)
+
 27 Oct 2016, PHP 7.1.0RC5
 
 - Core:

ext/json/json.c

@@ -186,7 +186,17 @@ static PHP_MINFO_FUNCTION(json)
 
 PHP_JSON_API int php_json_encode(smart_str *buf, zval *val, int options) /* {{{ */
 {
-	return php_json_encode_zval(buf, val, options);
+	php_json_encoder encoder;
+	int return_code;
+
+	php_json_encode_init(&encoder);
+	encoder.max_depth = JSON_G(encode_max_depth);
+	encoder.error_code = PHP_JSON_ERROR_NONE;
+
+	return_code = php_json_encode_zval(buf, val, options, &encoder);
+	JSON_G(error_code) = encoder.error_code;
+
+	return return_code;
 }
 /* }}} */
 
@@ -211,6 +221,7 @@ PHP_JSON_API int php_json_decode_ex(zval *return_value, char *str, size_t str_le
 static PHP_FUNCTION(json_encode)
 {
 	zval *parameter;
+	php_json_encoder encoder;
 	smart_str buf = {0};
 	zend_long options = 0;
 	zend_long depth = PHP_JSON_PARSER_DEFAULT_DEPTH;
@@ -219,23 +230,23 @@ static PHP_FUNCTION(json_encode)
 		return;
 	}
 
-	JSON_G(error_code) = PHP_JSON_ERROR_NONE;
+	php_json_encode_init(&encoder);
+	encoder.max_depth = (int)depth;
+	encoder.error_code = PHP_JSON_ERROR_NONE;
+	php_json_encode_zval(&buf, parameter, (int)options, &encoder);
+	JSON_G(error_code) = encoder.error_code;
 
-	JSON_G(encode_max_depth) = (int)depth;
-
-	php_json_encode(&buf, parameter, (int)options);
-
-	if (JSON_G(error_code) != PHP_JSON_ERROR_NONE && !(options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR)) {
+	if (encoder.error_code != PHP_JSON_ERROR_NONE && !(options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR)) {
 		smart_str_free(&buf);
-		ZVAL_FALSE(return_value);
-	} else {
+		RETURN_FALSE;
+	}
+
 	smart_str_0(&buf); /* copy? */
 	if (buf.s) {
 		RETURN_NEW_STR(buf.s);
 	}
 	RETURN_EMPTY_STRING();
 }
-}
 /* }}} */
 
 /* {{{ proto mixed json_decode(string json [, bool assoc [, long depth]])

ext/json/json_encoder.c

@@ -29,11 +29,14 @@
 #include "ext/standard/html.h"
 #include "zend_smart_str.h"
 #include "php_json.h"
+#include "php_json_encoder.h"
 #include <zend_exceptions.h>
 
 static const char digits[] = "0123456789abcdef";
 
-static int php_json_escape_string(smart_str *buf, char *s, size_t len, int options);
+static int php_json_escape_string(
+		smart_str *buf,	char *s, size_t len,
+		int options, php_json_encoder *encoder);
 
 static int php_json_determine_array_type(zval *val) /* {{{ */
 {
@@ -76,12 +79,12 @@ static inline void php_json_pretty_print_char(smart_str *buf, int options, char
 }
 /* }}} */
 
-static inline void php_json_pretty_print_indent(smart_str *buf, int options) /* {{{ */
+static inline void php_json_pretty_print_indent(smart_str *buf, int options, php_json_encoder *encoder) /* {{{ */
 {
 	int i;
 
 	if (options & PHP_JSON_PRETTY_PRINT) {
-		for (i = 0; i < JSON_G(encoder_depth); ++i) {
+		for (i = 0; i < encoder->depth; ++i) {
 			smart_str_appendl(buf, "    ", 4);
 		}
 	}
@@ -126,7 +129,7 @@ static inline void php_json_encode_double(smart_str *buf, double d, int options)
 		} \
 	} while (0)
 
-static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{ */
+static int php_json_encode_array(smart_str *buf, zval *val, int options, php_json_encoder *encoder) /* {{{ */
 {
 	int i, r, need_comma = 0;
 	HashTable *myht;
@@ -140,7 +143,7 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 	}
 
 	if (myht && ZEND_HASH_GET_APPLY_COUNT(myht) > 1) {
-		JSON_G(error_code) = PHP_JSON_ERROR_RECURSION;
+		encoder->error_code = PHP_JSON_ERROR_RECURSION;
 		smart_str_appendl(buf, "null", 4);
 		return FAILURE;
 	}
@@ -151,7 +154,7 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 		smart_str_appendc(buf, '{');
 	}
 
-	++JSON_G(encoder_depth);
+	++encoder->depth;
 
 	i = myht ? zend_hash_num_elements(myht) : 0;
 
@@ -174,7 +177,7 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 				}
 
 				php_json_pretty_print_char(buf, options, '\n');
-				php_json_pretty_print_indent(buf, options);
+				php_json_pretty_print_indent(buf, options, encoder);
 			} else if (r == PHP_JSON_OUTPUT_OBJECT) {
 				if (key) {
 					if (ZSTR_VAL(key)[0] == '\0' && ZSTR_LEN(key) > 0 && Z_TYPE_P(val) == IS_OBJECT) {
@@ -190,9 +193,10 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 					}
 
 					php_json_pretty_print_char(buf, options, '\n');
-					php_json_pretty_print_indent(buf, options);
+					php_json_pretty_print_indent(buf, options, encoder);
 
-					php_json_escape_string(buf, ZSTR_VAL(key), ZSTR_LEN(key), options & ~PHP_JSON_NUMERIC_CHECK);
+					php_json_escape_string(buf, ZSTR_VAL(key), ZSTR_LEN(key),
+							options & ~PHP_JSON_NUMERIC_CHECK, encoder);
 				} else {
 					if (need_comma) {
 						smart_str_appendc(buf, ',');
@@ -201,7 +205,7 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 					}
 
 					php_json_pretty_print_char(buf, options, '\n');
-					php_json_pretty_print_indent(buf, options);
+					php_json_pretty_print_indent(buf, options, encoder);
 
 					smart_str_appendc(buf, '"');
 					smart_str_append_long(buf, (zend_long) index);
@@ -212,7 +216,8 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 				php_json_pretty_print_char(buf, options, ' ');
 			}
 
-			if (php_json_encode(buf, data, options) == FAILURE && !(options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR)) {
+			if (php_json_encode_zval(buf, data, options, encoder) == FAILURE &&
+					!(options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR)) {
 				PHP_JSON_HASH_APPLY_PROTECTION_DEC(tmp_ht);
 				return FAILURE;
 			}
@@ -221,18 +226,18 @@ static int php_json_encode_array(smart_str *buf, zval *val, int options) /* {{{
 		} ZEND_HASH_FOREACH_END();
 	}
 
-	if (JSON_G(encoder_depth) > JSON_G(encode_max_depth)) {
-		JSON_G(error_code) = PHP_JSON_ERROR_DEPTH;
+	if (encoder->depth > encoder->max_depth) {
+		encoder->error_code = PHP_JSON_ERROR_DEPTH;
 		if (!(options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR)) {
 			return FAILURE;
 		}
 	}
-	--JSON_G(encoder_depth);
+	--encoder->depth;
 
 	/* Only keep closing bracket on same line for empty arrays/objects */
 	if (need_comma) {
 		php_json_pretty_print_char(buf, options, '\n');
-		php_json_pretty_print_indent(buf, options);
+		php_json_pretty_print_indent(buf, options, encoder);
 	}
 
 	if (r == PHP_JSON_OUTPUT_ARRAY) {
@@ -282,7 +287,9 @@ static int php_json_utf8_to_utf16(unsigned short *utf16, char utf8[], size_t len
 }
 /* }}} */
 
-static int php_json_escape_string(smart_str *buf, char *s, size_t len, int options) /* {{{ */
+static int php_json_escape_string(
+		smart_str *buf, char *s, size_t len,
+		int options, php_json_encoder *encoder) /* {{{ */
 {
 	int status;
 	unsigned int us;
@@ -313,7 +320,7 @@ static int php_json_escape_string(smart_str *buf, char *s, size_t len, int optio
 	if (options & PHP_JSON_UNESCAPED_UNICODE) {
 		/* validate UTF-8 string first */
 		if (php_json_utf8_to_utf16(NULL, s, len) < 0) {
-			JSON_G(error_code) = PHP_JSON_ERROR_UTF8;
+			encoder->error_code = PHP_JSON_ERROR_UTF8;
 			if (options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR) {
 				smart_str_appendl(buf, "null", 4);
 			}
@@ -337,7 +344,7 @@ static int php_json_escape_string(smart_str *buf, char *s, size_t len, int optio
 				if (buf->s) {
 					ZSTR_LEN(buf->s) = checkpoint;
 				}
-				JSON_G(error_code) = PHP_JSON_ERROR_UTF8;
+				encoder->error_code = PHP_JSON_ERROR_UTF8;
 				if (options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR) {
 					smart_str_appendl(buf, "null", 4);
 				}
@@ -465,12 +472,12 @@ static int php_json_escape_string(smart_str *buf, char *s, size_t len, int optio
 }
 /* }}} */
 
-static int php_json_encode_serializable_object(smart_str *buf, zval *val, int options) /* {{{ */
+static int php_json_encode_serializable_object(smart_str *buf, zval *val, int options, php_json_encoder *encoder) /* {{{ */
 {
 	zend_class_entry *ce = Z_OBJCE_P(val);
 	zval retval, fname;
 	HashTable* myht;
-	int origin_error_code;
+	int return_code;
 
 	if (Z_TYPE_P(val) == IS_ARRAY) {
 		myht = Z_ARRVAL_P(val);
@@ -479,7 +486,7 @@ static int php_json_encode_serializable_object(smart_str *buf, zval *val, int op
 	}
 
 	if (myht && ZEND_HASH_GET_APPLY_COUNT(myht) > 1) {
-		JSON_G(error_code) = PHP_JSON_ERROR_RECURSION;
+		encoder->error_code = PHP_JSON_ERROR_RECURSION;
 		if (options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR) {
 			smart_str_appendl(buf, "null", 4);
 		}
@@ -489,7 +496,6 @@ static int php_json_encode_serializable_object(smart_str *buf, zval *val, int op
 
 	ZVAL_STRING(&fname, "jsonSerialize");
 
-	origin_error_code = JSON_G(error_code);
 	if (FAILURE == call_user_function_ex(EG(function_table), val, &fname, &retval, 0, NULL, 1, NULL) || Z_TYPE(retval) == IS_UNDEF) {
 		if (!EG(exception)) {
 			zend_throw_exception_ex(NULL, 0, "Failed calling %s::jsonSerialize()", ZSTR_VAL(ce->name));
@@ -502,7 +508,6 @@ static int php_json_encode_serializable_object(smart_str *buf, zval *val, int op
 		return FAILURE;
 	}
 
-	JSON_G(error_code) = origin_error_code;
 	if (EG(exception)) {
 		/* Error already raised */
 		zval_ptr_dtor(&retval);
@@ -517,20 +522,20 @@ static int php_json_encode_serializable_object(smart_str *buf, zval *val, int op
 	if ((Z_TYPE(retval) == IS_OBJECT) &&
 		(Z_OBJ(retval) == Z_OBJ_P(val))) {
 		/* Handle the case where jsonSerialize does: return $this; by going straight to encode array */
-		php_json_encode_array(buf, &retval, options);
+		return_code = php_json_encode_array(buf, &retval, options, encoder);
 	} else {
 		/* All other types, encode as normal */
-		php_json_encode(buf, &retval, options);
+		return_code = php_json_encode_zval(buf, &retval, options, encoder);
 	}
 
 	zval_ptr_dtor(&retval);
 	zval_ptr_dtor(&fname);
 
-	return SUCCESS;
+	return return_code;
 }
 /* }}} */
 
-int php_json_encode_zval(smart_str *buf, zval *val, int options) /* {{{ */
+int php_json_encode_zval(smart_str *buf, zval *val, int options, php_json_encoder *encoder) /* {{{ */
 {
 again:
 	switch (Z_TYPE_P(val))
@@ -554,28 +559,28 @@ again:
 			if (php_json_is_valid_double(Z_DVAL_P(val))) {
 				php_json_encode_double(buf, Z_DVAL_P(val), options);
 			} else {
-				JSON_G(error_code) = PHP_JSON_ERROR_INF_OR_NAN;
+				encoder->error_code = PHP_JSON_ERROR_INF_OR_NAN;
 				smart_str_appendc(buf, '0');
 			}
 			break;
 
 		case IS_STRING:
-			return php_json_escape_string(buf, Z_STRVAL_P(val), Z_STRLEN_P(val), options);
+			return php_json_escape_string(buf, Z_STRVAL_P(val), Z_STRLEN_P(val), options, encoder);
 
 		case IS_OBJECT:
 			if (instanceof_function(Z_OBJCE_P(val), php_json_serializable_ce)) {
-				return php_json_encode_serializable_object(buf, val, options);
+				return php_json_encode_serializable_object(buf, val, options, encoder);
 			}
 			/* fallthrough -- Non-serializable object */
 		case IS_ARRAY:
-			return php_json_encode_array(buf, val, options);
+			return php_json_encode_array(buf, val, options, encoder);
 
 		case IS_REFERENCE:
 			val = Z_REFVAL_P(val);
 			goto again;
 
 		default:
-			JSON_G(error_code) = PHP_JSON_ERROR_UNSUPPORTED_TYPE;
+			encoder->error_code = PHP_JSON_ERROR_UNSUPPORTED_TYPE;
 			if (options & PHP_JSON_PARTIAL_OUTPUT_ON_ERROR) {
 				smart_str_appendl(buf, "null", 4);
 			}

ext/json/php_json_encoder.h

@@ -22,6 +22,19 @@
 #include "php.h"
 #include "zend_smart_str.h"
 
-int php_json_encode_zval(smart_str *buf, zval *val, int options);
+typedef struct _php_json_encoder php_json_encoder;
+
+struct _php_json_encoder {
+	int depth;
+	int max_depth;
+	php_json_error_code error_code;
+};
+
+static inline void php_json_encode_init(php_json_encoder *encoder)
+{
+	memset(encoder, 0, sizeof(php_json_encoder));
+}
+
+int php_json_encode_zval(smart_str *buf, zval *val, int options, php_json_encoder *encoder);
 
 #endif	/* PHP_JSON_ENCODER_H */

ext/json/tests/bug66025.phpt

@@ -0,0 +1,19 @@
+--TEST--
+Bug #66025 (Indent wrong when json_encode() called from jsonSerialize function)
+--SKIPIF--
+<?php
+if (!extension_loaded('json')) die('skip');
+?>
+--FILE--
+<?php
+
+class Foo implements JsonSerializable {
+    public function jsonSerialize() {
+	    return json_encode([1], JSON_PRETTY_PRINT);
+	}
+}
+
+echo json_encode([new Foo]), "\n";
+?>
+--EXPECT--
+["[\n    1\n]"]

ext/json/tests/bug73254.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #73254 (Incorrect indentation generated by json_encode() with JSON_PRETTY_PRINT)
+--SKIPIF--
+<?php
+if (!extension_loaded('json')) die('skip');
+?>
+--FILE--
+<?php
+
+echo json_encode([json_encode([1], JSON_PRETTY_PRINT)]), "\n";
+
+$fp = fopen('php://temp', 'r');
+$data = ['a' => $fp];
+echo json_encode($data), "\n";
+echo json_encode([json_encode([1], JSON_PRETTY_PRINT)]), "\n";
+
+?>
+--EXPECT--
+["[\n    1\n]"]
+
+["[\n    1\n]"]