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
216
217
218
219
220
221
222
223
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/* First checked in on 98/12/03 by John R. McMullen, derived from net.h/mkparse.c. */
#ifndef _ESCAPE_H_
#define _ESCAPE_H_
#include "nscore.h"
#include "nsError.h"
#include "nsString.h"
/**
* Valid mask values for nsEscape
* Note: these values are copied in nsINetUtil.idl. Any changes should be kept
* in sync.
*/
typedef enum {
url_All = 0, // %-escape every byte unconditionally
url_XAlphas = 1u << 0, // Normal escape - leave alphas intact, escape the rest
url_XPAlphas = 1u << 1, // As url_XAlphas, but convert spaces (0x20) to '+' and plus to %2B
url_Path = 1u << 2 // As url_XAlphas, but don't escape slash ('/')
} nsEscapeMask;
#ifdef __cplusplus
extern "C" {
#endif
/**
* Escape the given string according to mask
* @param aSstr The string to escape
* @param aLength The length of the string to escape
* @param aOutputLen A pointer that will be used to store the length of the
* output string, if not null
* @param aMask How to escape the string
* @return A newly allocated escaped string that must be free'd with
* nsCRT::free, or null on failure
* @note: Please, don't use this function. Use NS_Escape instead!
*/
char* nsEscape(const char* aStr, size_t aLength, size_t* aOutputLen,
nsEscapeMask aMask);
char* nsUnescape(char* aStr);
/* decode % escaped hex codes into character values,
* modifies the parameter, returns the same buffer
*/
int32_t nsUnescapeCount(char* aStr);
/* decode % escaped hex codes into character values,
* modifies the parameter buffer, returns the length of the result
* (result may contain \0's).
*/
char*
nsEscapeHTML(const char* aString);
char16_t*
nsEscapeHTML2(const char16_t* aSourceBuffer,
int32_t aSourceBufferLen = -1);
/*
* Escape problem char's for HTML display
*/
#ifdef __cplusplus
}
#endif
/**
* NS_EscapeURL/NS_UnescapeURL constants for |flags| parameter:
*
* Note: These values are copied to nsINetUtil.idl
* Any changes should be kept in sync
*/
enum EscapeMask {
/** url components **/
esc_Scheme = 1u << 0,
esc_Username = 1u << 1,
esc_Password = 1u << 2,
esc_Host = 1u << 3,
esc_Directory = 1u << 4,
esc_FileBaseName = 1u << 5,
esc_FileExtension = 1u << 6,
esc_FilePath = esc_Directory | esc_FileBaseName | esc_FileExtension,
esc_Param = 1u << 7,
esc_Query = 1u << 8,
esc_Ref = 1u << 9,
/** special flags **/
esc_Minimal = esc_Scheme | esc_Username | esc_Password | esc_Host | esc_FilePath | esc_Param | esc_Query | esc_Ref,
esc_Forced = 1u << 10, /* forces escaping of existing escape sequences */
esc_OnlyASCII = 1u << 11, /* causes non-ascii octets to be skipped */
esc_OnlyNonASCII = 1u << 12, /* causes _graphic_ ascii octets (0x20-0x7E)
* to be skipped when escaping. causes all
* ascii octets (<= 0x7F) to be skipped when unescaping */
esc_AlwaysCopy = 1u << 13, /* copy input to result buf even if escaping is unnecessary */
esc_Colon = 1u << 14, /* forces escape of colon */
esc_SkipControl = 1u << 15 /* skips C0 and DEL from unescaping */
};
/**
* NS_EscapeURL
*
* Escapes invalid char's in an URL segment. Has no side-effect if the URL
* segment is already escaped, unless aFlags has the esc_Forced bit in which
* case % will also be escaped. Iff some part of aStr is escaped is the
* final result appended to aResult. You can also request that aStr is
* always appended to aResult with esc_AlwaysCopy.
*
* @param aStr url segment string
* @param aLen url segment string length (-1 if unknown)
* @param aFlags url segment type flag (see EscapeMask above)
* @param aResult result buffer, untouched if aStr is already escaped unless
* aFlags has esc_AlwaysCopy
*
* @return true if aResult was written to (i.e. at least one character was
* escaped or esc_AlwaysCopy was requested), false otherwise.
*/
bool NS_EscapeURL(const char* aStr,
int32_t aLen,
uint32_t aFlags,
nsACString& aResult);
/**
* Expands URL escape sequences... beware embedded null bytes!
*
* @param aStr url string to unescape
* @param aLen length of aStr
* @param aFlags only esc_OnlyNonASCII, esc_SkipControl and esc_AlwaysCopy
* are recognized
* @param aResult result buffer, untouched if aStr is already unescaped unless
* aFlags has esc_AlwaysCopy
*
* @return true if aResult was written to (i.e. at least one character was
* unescaped or esc_AlwaysCopy was requested), false otherwise.
*/
bool NS_UnescapeURL(const char* aStr,
int32_t aLen,
uint32_t aFlags,
nsACString& aResult);
/** returns resultant string length **/
inline int32_t
NS_UnescapeURL(char* aStr)
{
return nsUnescapeCount(aStr);
}
/**
* String friendly versions...
*/
inline const nsCSubstring&
NS_EscapeURL(const nsCSubstring& aStr, uint32_t aFlags, nsCSubstring& aResult)
{
if (NS_EscapeURL(aStr.Data(), aStr.Length(), aFlags, aResult)) {
return aResult;
}
return aStr;
}
/**
* Fallible version of NS_EscapeURL. On success aResult will point to either
* the original string or an escaped copy.
*/
nsresult
NS_EscapeURL(const nsCSubstring& aStr, uint32_t aFlags, nsCSubstring& aResult,
const mozilla::fallible_t&);
inline const nsCSubstring&
NS_UnescapeURL(const nsCSubstring& aStr, uint32_t aFlags, nsCSubstring& aResult)
{
if (NS_UnescapeURL(aStr.Data(), aStr.Length(), aFlags, aResult)) {
return aResult;
}
return aStr;
}
const nsSubstring&
NS_EscapeURL(const nsSubstring& aStr, uint32_t aFlags, nsSubstring& aResult);
/**
* Percent-escapes all characters in aStr that occurs in aForbidden.
* @param aStr the input URL string
* @param aForbidden the characters that should be escaped if found in aStr
* @note that aForbidden MUST be sorted (low to high)
* @param aResult the result if some characters were escaped
* @return aResult if some characters were escaped, or aStr otherwise (aResult
* is unmodified in that case)
*/
const nsSubstring&
NS_EscapeURL(const nsAFlatString& aStr, const nsTArray<char16_t>& aForbidden,
nsSubstring& aResult);
/**
* CString version of nsEscape. Returns true on success, false
* on out of memory. To reverse this function, use NS_UnescapeURL.
*/
inline bool
NS_Escape(const nsACString& aOriginal, nsACString& aEscaped,
nsEscapeMask aMask)
{
size_t escLen = 0;
char* esc = nsEscape(aOriginal.BeginReading(), aOriginal.Length(), &escLen,
aMask);
if (! esc) {
return false;
}
aEscaped.Adopt(esc, escLen);
return true;
}
/**
* Inline unescape of mutable string object.
*/
inline nsACString&
NS_UnescapeURL(nsACString& aStr)
{
aStr.SetLength(nsUnescapeCount(aStr.BeginWriting()));
return aStr;
}
#endif // _ESCAPE_H_
|
