xref: /aosp_15_r20/external/cronet/base/json/json_common.h (revision 6777b5387eb2ff775bb5750e3f5d96f37fb7352b)
1*6777b538SAndroid Build Coastguard Worker // Copyright 2019 The Chromium Authors
2*6777b538SAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be
3*6777b538SAndroid Build Coastguard Worker // found in the LICENSE file.
4*6777b538SAndroid Build Coastguard Worker 
5*6777b538SAndroid Build Coastguard Worker #ifndef BASE_JSON_JSON_COMMON_H_
6*6777b538SAndroid Build Coastguard Worker #define BASE_JSON_JSON_COMMON_H_
7*6777b538SAndroid Build Coastguard Worker 
8*6777b538SAndroid Build Coastguard Worker #include <stddef.h>
9*6777b538SAndroid Build Coastguard Worker 
10*6777b538SAndroid Build Coastguard Worker #include "base/check_op.h"
11*6777b538SAndroid Build Coastguard Worker #include "base/memory/raw_ptr.h"
12*6777b538SAndroid Build Coastguard Worker 
13*6777b538SAndroid Build Coastguard Worker namespace base {
14*6777b538SAndroid Build Coastguard Worker namespace internal {
15*6777b538SAndroid Build Coastguard Worker 
16*6777b538SAndroid Build Coastguard Worker // Chosen to support 99.9% of documents found in the wild late 2016.
17*6777b538SAndroid Build Coastguard Worker // http://crbug.com/673263
18*6777b538SAndroid Build Coastguard Worker const size_t kAbsoluteMaxDepth = 200;
19*6777b538SAndroid Build Coastguard Worker 
20*6777b538SAndroid Build Coastguard Worker // Simple class that checks for maximum recursion/stack overflow.
21*6777b538SAndroid Build Coastguard Worker class StackMarker {
22*6777b538SAndroid Build Coastguard Worker  public:
StackMarker(size_t max_depth,size_t * depth)23*6777b538SAndroid Build Coastguard Worker   StackMarker(size_t max_depth, size_t* depth)
24*6777b538SAndroid Build Coastguard Worker       : max_depth_(max_depth), depth_(depth) {
25*6777b538SAndroid Build Coastguard Worker     ++(*depth_);
26*6777b538SAndroid Build Coastguard Worker     DCHECK_LE(*depth_, max_depth_);
27*6777b538SAndroid Build Coastguard Worker   }
28*6777b538SAndroid Build Coastguard Worker 
29*6777b538SAndroid Build Coastguard Worker   StackMarker(const StackMarker&) = delete;
30*6777b538SAndroid Build Coastguard Worker   StackMarker& operator=(const StackMarker&) = delete;
31*6777b538SAndroid Build Coastguard Worker 
~StackMarker()32*6777b538SAndroid Build Coastguard Worker   ~StackMarker() { --(*depth_); }
33*6777b538SAndroid Build Coastguard Worker 
IsTooDeep()34*6777b538SAndroid Build Coastguard Worker   bool IsTooDeep() const { return *depth_ >= max_depth_; }
35*6777b538SAndroid Build Coastguard Worker 
36*6777b538SAndroid Build Coastguard Worker  private:
37*6777b538SAndroid Build Coastguard Worker   const size_t max_depth_;
38*6777b538SAndroid Build Coastguard Worker   const raw_ptr<size_t> depth_;
39*6777b538SAndroid Build Coastguard Worker };
40*6777b538SAndroid Build Coastguard Worker 
41*6777b538SAndroid Build Coastguard Worker }  // namespace internal
42*6777b538SAndroid Build Coastguard Worker }  // namespace base
43*6777b538SAndroid Build Coastguard Worker 
44*6777b538SAndroid Build Coastguard Worker #endif  // BASE_JSON_JSON_COMMON_H_
45