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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
#pragma once
#include <util/stream/output.h>
#include <util/string/escape.h>
#include <util/memory/tempbuf.h>
#include <util/generic/strbuf.h>
namespace NEscJ {
// almost copypaste from util/string/escape.h
// todo: move there (note difference in IsPrintable and handling of string)
inline char HexDigit(char value) {
if (value < 10)
return '0' + value;
else
return 'A' + value - 10;
}
inline char OctDigit(char value) {
return '0' + value;
}
inline bool IsUTF8(ui8 c) {
return c < 0xf5 && c != 0xC0 && c != 0xC1;
}
inline bool IsControl(ui8 c) {
return c < 0x20 || c == 0x7f;
}
inline bool IsPrintable(ui8 c) {
return IsUTF8(c) && !IsControl(c);
}
inline bool IsHexDigit(ui8 c) {
return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
}
inline bool IsOctDigit(ui8 c) {
return c >= '0' && c <= '7';
}
struct TEscapeUtil {
static const size_t ESCAPE_C_BUFFER_SIZE = 6;
template <bool asunicode>
static inline size_t EscapeJ(ui8 c, ui8 next, char r[ESCAPE_C_BUFFER_SIZE], TStringBuf safe, TStringBuf unsafe) {
// (1) Printable characters go as-is, except backslash and double quote.
// (2) Characters \r, \n, \t and \0 ... \7 replaced by their simple escape characters (if possible).
// (3) Otherwise, character is encoded using hexadecimal escape sequence (if possible), or octal.
if (safe.find(c) != TStringBuf::npos) {
r[0] = c;
return 1;
}
if (c == '\"') {
r[0] = '\\';
r[1] = '\"';
return 2;
} else if (c == '\\') {
r[0] = '\\';
r[1] = '\\';
return 2;
} else if (IsPrintable(c) && unsafe.find(c) == TStringBuf::npos) {
r[0] = c;
return 1;
} else if (c == '\b') {
r[0] = '\\';
r[1] = 'b';
return 2;
} else if (c == '\f') {
r[0] = '\\';
r[1] = 'f';
return 2;
} else if (c == '\r') {
r[0] = '\\';
r[1] = 'r';
return 2;
} else if (c == '\n') {
r[0] = '\\';
r[1] = 'n';
return 2;
} else if (c == '\t') {
r[0] = '\\';
r[1] = 't';
return 2;
} else if (asunicode && IsUTF8(c)) { // utf8 controls escape for json
r[0] = '\\';
r[1] = 'u';
r[2] = '0';
r[3] = '0';
r[4] = HexDigit((c & 0xF0) >> 4);
r[5] = HexDigit((c & 0x0F) >> 0);
return 6;
} else if (c < 8 && !IsOctDigit(next)) {
r[0] = '\\';
r[1] = OctDigit(c);
return 2;
} else if (!IsHexDigit(next)) {
r[0] = '\\';
r[1] = 'x';
r[2] = HexDigit((c & 0xF0) >> 4);
r[3] = HexDigit((c & 0x0F) >> 0);
return 4;
} else {
r[0] = '\\';
r[1] = OctDigit((c & 0700) >> 6);
r[2] = OctDigit((c & 0070) >> 3);
r[3] = OctDigit((c & 0007) >> 0);
return 4;
}
}
static inline size_t EscapeJ(ui8 c, ui8 next, char r[ESCAPE_C_BUFFER_SIZE], TStringBuf safe, TStringBuf unsafe) {
return EscapeJ<false>(c, next, r, safe, unsafe);
}
};
inline size_t SuggestBuffer(size_t len) {
return len * TEscapeUtil::ESCAPE_C_BUFFER_SIZE;
}
template <bool tounicode>
inline size_t EscapeJ(const char* str, size_t len, char* out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
char* out0 = out;
char buffer[TEscapeUtil::ESCAPE_C_BUFFER_SIZE];
size_t i, j;
for (i = 0, j = 0; i < len; ++i) {
size_t rlen = TEscapeUtil::EscapeJ<tounicode>(str[i], (i + 1 < len ? str[i + 1] : 0), buffer, safe, unsafe);
if (rlen > 1) {
strncpy(out, str + j, i - j);
out += i - j;
j = i + 1;
strncpy(out, buffer, rlen);
out += rlen;
}
}
if (j > 0) {
strncpy(out, str + j, len - j);
out += len - j;
} else {
strncpy(out, str, len);
out += len;
}
return out - out0;
}
template <bool quote, bool tounicode>
inline void EscapeJ(TStringBuf in, IOutputStream& out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
TTempBuf b(SuggestBuffer(in.size()) + 2);
if (quote)
b.Append("\"", 1);
b.Proceed(EscapeJ<tounicode>(in.data(), in.size(), b.Current(), safe, unsafe));
if (quote)
b.Append("\"", 1);
out.Write(b.Data(), b.Filled());
}
template <bool quote, bool tounicode>
inline void EscapeJ(TStringBuf in, TString& out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
TTempBuf b(SuggestBuffer(in.size()) + 2);
if (quote)
b.Append("\"", 1);
b.Proceed(EscapeJ<tounicode>(in.data(), in.size(), b.Current(), safe, unsafe));
if (quote)
b.Append("\"", 1);
out.append(b.Data(), b.Filled());
}
template <bool quote, bool tounicode>
inline TString EscapeJ(TStringBuf in, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
TString s;
EscapeJ<quote, tounicode>(in, s, safe, unsafe);
return s;
}
// If the template parameter "tounicode" is ommited, then use the default value false
inline size_t EscapeJ(const char* str, size_t len, char* out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
return EscapeJ<false>(str, len, out, safe, unsafe);
}
template <bool quote>
inline void EscapeJ(TStringBuf in, IOutputStream& out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
EscapeJ<quote, false>(in, out, safe, unsafe);
}
template <bool quote>
inline void EscapeJ(TStringBuf in, TString& out, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
EscapeJ<quote, false>(in, out, safe, unsafe);
}
template <bool quote>
inline TString EscapeJ(TStringBuf in, TStringBuf safe = TStringBuf(), TStringBuf unsafe = TStringBuf()) {
return EscapeJ<quote, false>(in, safe, unsafe);
}
}
|
