1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#define __json_h__
#include <vector>
#include "gtest/gtest.h"
#include "nss_scoped_ptrs.h"
#include "pk11pub.h"
// If we make a few assumptions about the file, parsing JSON can be easy.
// This is not a full parser, it only works on a narrow set of inputs.
class JsonReader {
public:
JsonReader(const std::string &n) : buf_(), available_(0), i_(0) {
f_.reset(PR_Open(n.c_str(), PR_RDONLY, 00600));
EXPECT_TRUE(f_) << "error opening vectors from: " << n;
buf_[0] = 0;
}
void next() { i_++; }
uint8_t peek() {
TopUp();
return buf_[i_];
}
uint8_t take() {
uint8_t v = peek();
next();
return v;
}
// No input checking, overflow protection, or any safety.
// Returns 0 if there isn't a number here rather than aborting.
uint64_t ReadInt() {
SkipWhitespace();
uint8_t c = peek();
uint64_t v = 0;
while (c >= '0' && c <= '9') {
v = v * 10 + c - '0';
next();
c = peek();
}
return v;
}
// No input checking, no unicode, no escaping (not even \"), just read ASCII.
std::string ReadString() {
SkipWhitespace();
if (peek() != '"') {
return "";
}
next();
std::string s;
uint8_t c = take();
while (c != '"') {
s.push_back(c);
c = take();
}
return s;
}
std::string ReadLabel() {
std::string s = ReadString();
SkipWhitespace();
EXPECT_EQ(take(), ':');
return s;
}
std::vector<uint8_t> ReadHex() {
SkipWhitespace();
uint8_t c = take();
EXPECT_EQ(c, '"');
std::vector<uint8_t> v;
c = take();
while (c != '"') {
v.push_back(JsonReader::Hex(c) << 4 | JsonReader::Hex(take()));
c = take();
}
return v;
}
bool NextItem(uint8_t h = '{', uint8_t t = '}') {
SkipWhitespace();
switch (uint8_t c = take()) {
case ',':
return true;
case '{':
case '[':
EXPECT_EQ(c, h);
SkipWhitespace();
if (peek() == t) {
next();
return false;
}
return true;
case '}':
case ']':
EXPECT_EQ(c, t);
return false;
default:
ADD_FAILURE() << "Unexpected '" << c << "'";
}
return false;
}
bool NextItemArray() { return NextItem('[', ']'); }
void SkipValue() {
uint8_t c = take();
if (c == '"') {
do {
c = take();
} while (c != '"');
} else if (c >= '0' && c <= '9') {
c = peek();
while (c >= '0' && c <= '9') {
next();
c = peek();
}
} else {
ADD_FAILURE() << "No idea how to skip'" << c << "'";
}
}
private:
void TopUp() {
if (available_ > i_) {
return;
}
i_ = 0;
if (!f_) {
return;
}
PRInt32 res = PR_Read(f_.get(), buf_, sizeof(buf_));
if (res > 0) {
available_ = static_cast<size_t>(res);
} else {
available_ = 1;
f_.reset(nullptr);
buf_[0] = 0;
}
}
void SkipWhitespace() {
uint8_t c = peek();
while (c && (c == ' ' || c == '\t' || c == '\r' || c == '\n')) {
next();
c = peek();
}
}
// This only handles lowercase.
uint8_t Hex(uint8_t c) {
if (c >= '0' && c <= '9') {
return c - '0';
}
EXPECT_TRUE(c >= 'a' && c <= 'f');
return c - 'a' + 10;
}
ScopedPRFileDesc f_;
uint8_t buf_[4096];
size_t available_;
size_t i_;
};
|
