forked from json-iterator/java
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathIterImplString.java
More file actions
215 lines (203 loc) · 9.13 KB
/
IterImplString.java
File metadata and controls
215 lines (203 loc) · 9.13 KB
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
209
210
211
212
213
214
215
package com.jsoniter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import static java.lang.Character.MIN_HIGH_SURROGATE;
import static java.lang.Character.MIN_LOW_SURROGATE;
import static java.lang.Character.MIN_SUPPLEMENTARY_CODE_POINT;
class IterImplString {
static int[] base64Tbl = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 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, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
public static final String readString(JsonIterator iter) throws IOException {
byte c = IterImpl.nextToken(iter);
if (c == '"') {
// try fast path first
for (int i = iter.head, j = 0; i < iter.tail && j < iter.reusableChars.length; i++, j++) {
c = iter.buf[i];
if (c == '"') {
iter.head = i + 1;
return new String(iter.reusableChars, 0, j);
}
// If we encounter a backslash, which is a beginning of an escape sequence
// or a high bit was set - indicating an UTF-8 encoded multibyte character,
// there is no chance that we can decode the string without instantiating
// a temporary buffer, so quit this loop
if ((c ^ '\\') < 1) break;
iter.reusableChars[j] = (char) c;
}
return readStringSlowPath(iter);
}
if (c == 'n') {
IterImpl.skipUntilBreak(iter);
return null;
}
throw iter.reportError("readString", "expect n or \"");
}
final static String readStringSlowPath(JsonIterator iter) throws IOException {
// http://grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/sun/nio/cs/UTF_8.java/?v=source
// byte => char with support of escape in one pass
int j = 0;
int minimumCapacity = iter.reusableChars.length - 2;
for (; ; ) {
if (j == minimumCapacity) {
char[] newBuf = new char[iter.reusableChars.length * 2];
System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);
iter.reusableChars = newBuf;
minimumCapacity = iter.reusableChars.length - 2;
}
int b1 = IterImpl.readByte(iter);
if (b1 >= 0) {
if (b1 == '"') {
return new String(iter.reusableChars, 0, j);
} else if (b1 == '\\') {
int b2 = IterImpl.readByte(iter);
switch (b2) {
case '"':
iter.reusableChars[j++] = '"';
break;
case '\\':
iter.reusableChars[j++] = '\\';
break;
case '/':
iter.reusableChars[j++] = '/';
break;
case 'b':
iter.reusableChars[j++] = '\b';
break;
case 'f':
iter.reusableChars[j++] = '\f';
break;
case 'n':
iter.reusableChars[j++] = '\n';
break;
case 'r':
iter.reusableChars[j++] = '\r';
break;
case 't':
iter.reusableChars[j++] = '\t';
break;
case 'u':
iter.reusableChars[j++] = IterImplNumber.readU4(iter);
break;
default:
throw iter.reportError("readStringSlowPath", "unexpected escape char: " + b2);
}
} else if (b1 == 0) {
throw iter.reportError("readStringSlowPath", "incomplete string");
} else {
// 1 byte, 7 bits: 0xxxxxxx
iter.reusableChars[j++] = (char) b1;
}
} else if ((b1 >> 5) == -2 && (b1 & 0x1e) != 0) {
// 2 bytes, 11 bits: 110xxxxx 10xxxxxx
int b2 = IterImpl.readByte(iter);
iter.reusableChars[j++] = (char) (((b1 << 6) ^ b2)
^
(((byte) 0xC0 << 6) ^
((byte) 0x80 << 0)));
} else if ((b1 >> 4) == -2) {
// 3 bytes, 16 bits: 1110xxxx 10xxxxxx 10xxxxxx
int b2 = IterImpl.readByte(iter);
int b3 = IterImpl.readByte(iter);
char c = (char)
((b1 << 12) ^
(b2 << 6) ^
(b3 ^
(((byte) 0xE0 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
iter.reusableChars[j++] = c;
} else if ((b1 >> 3) == -2) {
// 4 bytes, 21 bits: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
int b2 = IterImpl.readByte(iter);
int b3 = IterImpl.readByte(iter);
int b4 = IterImpl.readByte(iter);
int uc = ((b1 << 18) ^
(b2 << 12) ^
(b3 << 6) ^
(b4 ^
(((byte) 0xF0 << 18) ^
((byte) 0x80 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
iter.reusableChars[j++] = highSurrogate(uc);
iter.reusableChars[j++] = lowSurrogate(uc);
} else {
throw iter.reportError("readStringSlowPath", "unexpected input");
}
}
}
private static char highSurrogate(int codePoint) {
return (char) ((codePoint >>> 10)
+ (MIN_HIGH_SURROGATE - (MIN_SUPPLEMENTARY_CODE_POINT >>> 10)));
}
private static char lowSurrogate(int codePoint) {
return (char) ((codePoint & 0x3ff) + MIN_LOW_SURROGATE);
}
public static final byte[] readBase64(JsonIterator iter) throws IOException {
// from https://gist.github.com/EmilHernvall/953733
Slice slice = IterImpl.readSlice(iter);
if (slice == null) {
return null;
}
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int end = slice.tail();
for (int i = slice.head(); i < end; i++) {
int b = 0;
if (base64Tbl[slice.data()[i]] != -1) {
b = (base64Tbl[slice.data()[i]] & 0xFF) << 18;
}
// skip unknown characters
else {
i++;
continue;
}
int num = 0;
if (i + 1 < end && base64Tbl[slice.data()[i + 1]] != -1) {
b = b | ((base64Tbl[slice.data()[i + 1]] & 0xFF) << 12);
num++;
}
if (i + 2 < end && base64Tbl[slice.data()[i + 2]] != -1) {
b = b | ((base64Tbl[slice.data()[i + 2]] & 0xFF) << 6);
num++;
}
if (i + 3 < end && base64Tbl[slice.data()[i + 3]] != -1) {
b = b | (base64Tbl[slice.data()[i + 3]] & 0xFF);
num++;
}
while (num > 0) {
int c = (b & 0xFF0000) >> 16;
buffer.write((char) c);
b <<= 8;
num--;
}
i += 4;
}
return buffer.toByteArray();
}
// slice does not allow escape
final static int findSliceEnd(JsonIterator iter) {
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (c == '"') {
return i + 1;
} else if (c == '\\') {
throw iter.reportError("findSliceEnd", "slice does not support escape char");
}
}
return -1;
}
}