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
|
package server;
import java.util.BitSet;
import java.util.HashMap;
import structures.ByteBuilder;
public class PercentEncoding {
public static boolean containsSpecialSymbol(String s){
if(s==null){return false;}
for(int i=0, max=s.length(); i<max; i++){
char c=s.charAt(i);
if(isSpecial.get(c)){
// System.err.print("b");
return true;}
}
// System.err.print("c");
return false;
}
public static boolean containsCommonSymbol(String s){
if(s==null){return false;}
for(int i=0, max=s.length(); i<max; i++){
char c=s.charAt(i);
if(isCommon.get(c)){return true;}
}
return false;
}
public static String symbolToCode(String s){
// System.err.print("a");
if(!containsSpecialSymbol(s)){return s;}
// System.err.print("d");
ByteBuilder bb=new ByteBuilder();
for(int i=0, max=s.length(); i<max; i++){
char c=s.charAt(i);
String code=symbolToCodeArray[c];
if(code!=null){
// System.err.print("e("+code+")");
bb.append(code);
}else{
// System.err.print("f");
bb.append(c);
}
}
// System.err.println("g");
// System.err.println(bb);
return bb.toString();
}
public static String commonSymbolToCode(String s){
if(!containsCommonSymbol(s)){return s;}
ByteBuilder bb=new ByteBuilder();
for(int i=0, max=s.length(); i<max; i++){
char c=s.charAt(i);
if(isCommon.get(c)){
String code=symbolToCodeArray[c];
assert(code!=null);
bb.append(code);
}else{
bb.append(c);
}
}
return bb.toString();
}
private static int parseCode(String s, int start){
if(s==null || start+2>=s.length()){return -1;}
assert(s.charAt(start)=='%');
int sum=0;
for(int i=start+1; i<=start+2; i++){
sum=sum<<4;
final char c=s.charAt(i);
if(c>='0' && c<='9'){
sum=sum+(c-'0');
}else if(c>='A' && c<'F'){
sum=sum+(10+c-'A');
}else{
return -1;
}
}
return sum;
}
public static String codeToSymbol(String s){
int idx=s.indexOf('%');
if(idx<0){return s;}
ByteBuilder bb=new ByteBuilder(s.length());
for(int i=0; i<s.length(); i++){
char c=s.charAt(i);
if(c=='%'){
int sym=parseCode(s, i);
if(sym<0){bb.append(c);}
else{
bb.append((char)sym);
i+=2;//Skip next 2 characters
}
}else{bb.append(c);}
}
return (bb.length()==s.length() ? s : bb.toString());
}
private static HashMap<String, String> makeCodeToSymbolMap() {
HashMap<String, String> map=new HashMap<String, String>(129);
assert(reservedSymbol.length==reservedCode.length);
assert(commonSymbol.length==commonCode.length);
for(int i=0; i<reservedSymbol.length; i++){
map.put(reservedCode[i], reservedSymbol[i]);
}
for(int i=0; i<commonSymbol.length; i++){
map.put(commonCode[i], commonSymbol[i]);
}
return map;
}
private static HashMap<String, String> makeSymbolToCodeMap() {
HashMap<String, String> map=new HashMap<String, String>(257);
assert(reservedSymbol.length==reservedCode.length);
assert(commonSymbol.length==commonCode.length);
for(int i=0; i<reservedSymbol.length; i++){
map.put(reservedSymbol[i], reservedCode[i]);
}
for(int i=0; i<commonSymbol.length; i++){
map.put(commonSymbol[i], commonCode[i]);
}
return map;
}
private static String[] makeSymbolToCodeArray() {
final String[] array=new String[128];
for(int i=0; i<reservedSymbol.length; i++){
String s=reservedSymbol[i];
String c=reservedCode[i];
array[s.charAt(0)]=c;
}
for(int i=0; i<commonSymbol.length; i++){
String s=commonSymbol[i];
String c=commonCode[i];
array[s.charAt(0)]=c;
}
return array;
}
private static final BitSet makeBitSet(String[]...matrix){
BitSet bs=new BitSet(128);
for(String[] array : matrix){
for(String s : array){
char c=s.charAt(0);
bs.set(c);
}
}
return bs;
}
//See https://en.wikipedia.org/wiki/Percent-encoding
public static final String[] reservedSymbol=new String[] {
"!", "#", "$", "&", "'", "(", ")", "*", "+", ",", "/", ":", ";", "=", "?", "@", "[", "]"
};
public static final String[] reservedCode=new String[] {
"%21", "%23", "%24", "%26", "%27", "%28", "%29", "%2A", "%2B", "%2C", "%2F", "%3A", "%3B", "%3D", "%3F", "%40", "%5B", "%5D"
};
public static final String[] commonSymbol=new String[] {
"\n", " ", "\"", "%", "<", ">", "\\", "|",
};
public static final String[] commonCode=new String[] {
"%0A", "%20", "%22", "%25", "%3C", "%3E", "%5C", "%7C"
};
private static final BitSet isSpecial=makeBitSet(reservedSymbol, commonSymbol);
private static final BitSet isCommon=makeBitSet(commonSymbol);
// public static final HashMap<String, String> codeToSymbolMap=makeCodeToSymbolMap();
// public static final HashMap<String, String> symbolToCodeMap=makeSymbolToCodeMap();
public static final String[] symbolToCodeArray=makeSymbolToCodeArray();
/** Don't print caught exceptions */
public static boolean suppressErrors=false;
}
|
