1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/json/string_escape.h"
6
7#include <gtest/gtest.h>
8#include <stddef.h>
9
10#include "base/macros.h"
11#include "base/strings/string_util.h"
12#include "base/strings/utf_string_conversion_utils.h"
13
14namespace base {
15
16TEST(JSONStringEscapeTest, EscapeUTF8) {
17  const struct {
18    const char* to_escape;
19    const char* escaped;
20  } cases[] = {
21    {"\b\001aZ\"\\wee", "\\b\\u0001aZ\\\"\\\\wee"},
22    {"a\b\f\n\r\t\v\1\\.\"z",
23        "a\\b\\f\\n\\r\\t\\u000B\\u0001\\\\.\\\"z"},
24    {"b\x0f\x7f\xf0\xff!",  // \xf0\xff is not a valid UTF-8 unit.
25        "b\\u000F\x7F\xEF\xBF\xBD\xEF\xBF\xBD!"},
26    {"c<>d", "c\\u003C>d"},
27    {"Hello\xe2\x80\xa8world", "Hello\\u2028world"},
28    {"\xe2\x80\xa9purple", "\\u2029purple"},
29  };
30
31  for (size_t i = 0; i < arraysize(cases); ++i) {
32    const char* in_ptr = cases[i].to_escape;
33    std::string in_str = in_ptr;
34
35    std::string out;
36    EscapeJSONString(in_ptr, false, &out);
37    EXPECT_EQ(std::string(cases[i].escaped), out);
38    EXPECT_TRUE(IsStringUTF8(out));
39
40    out.erase();
41    bool convert_ok = EscapeJSONString(in_str, false, &out);
42    EXPECT_EQ(std::string(cases[i].escaped), out);
43    EXPECT_TRUE(IsStringUTF8(out));
44
45    if (convert_ok) {
46      std::string fooout = GetQuotedJSONString(in_str);
47      EXPECT_EQ("\"" + std::string(cases[i].escaped) + "\"", fooout);
48      EXPECT_TRUE(IsStringUTF8(out));
49    }
50  }
51
52  std::string in = cases[0].to_escape;
53  std::string out;
54  EscapeJSONString(in, false, &out);
55  EXPECT_TRUE(IsStringUTF8(out));
56
57  // test quoting
58  std::string out_quoted;
59  EscapeJSONString(in, true, &out_quoted);
60  EXPECT_EQ(out.length() + 2, out_quoted.length());
61  EXPECT_EQ(out_quoted.find(out), 1U);
62  EXPECT_TRUE(IsStringUTF8(out_quoted));
63
64  // now try with a NULL in the string
65  std::string null_prepend = "test";
66  null_prepend.push_back(0);
67  in = null_prepend + in;
68  std::string expected = "test\\u0000";
69  expected += cases[0].escaped;
70  out.clear();
71  EscapeJSONString(in, false, &out);
72  EXPECT_EQ(expected, out);
73  EXPECT_TRUE(IsStringUTF8(out));
74}
75
76TEST(JSONStringEscapeTest, EscapeBytes) {
77  const struct {
78    const char* to_escape;
79    const char* escaped;
80  } cases[] = {
81    {"b\x0f\x7f\xf0\xff!", "b\\u000F\\u007F\\u00F0\\u00FF!"},
82    {"\xe5\xc4\x4f\x05\xb6\xfd", "\\u00E5\\u00C4O\\u0005\\u00B6\\u00FD"},
83  };
84
85  for (size_t i = 0; i < arraysize(cases); ++i) {
86    std::string in = std::string(cases[i].to_escape);
87    EXPECT_FALSE(IsStringUTF8(in));
88
89    EXPECT_EQ(std::string(cases[i].escaped),
90        EscapeBytesAsInvalidJSONString(in, false));
91    EXPECT_EQ("\"" + std::string(cases[i].escaped) + "\"",
92        EscapeBytesAsInvalidJSONString(in, true));
93  }
94
95  const char kEmbedNull[] = { '\xab', '\x39', '\0', '\x9f', '\xab' };
96  std::string in(kEmbedNull, arraysize(kEmbedNull));
97  EXPECT_FALSE(IsStringUTF8(in));
98  EXPECT_EQ(std::string("\\u00AB9\\u0000\\u009F\\u00AB"),
99            EscapeBytesAsInvalidJSONString(in, false));
100}
101
102}  // namespace base
103