1
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2
// Use of this source code is governed by a BSD-style license that can be
3
// found in the LICENSE file.
5
#ifndef NET_BASE_ESCAPE_H_
6
#define NET_BASE_ESCAPE_H_
11
#include "base/basictypes.h"
12
#include "base/strings/string16.h"
13
#include "net/base/net_export.h"
17
// Escaping --------------------------------------------------------------------
19
// Escapes characters in text suitable for use as a query parameter value.
20
// We %XX everything except alphanumerics and -_.!~*'()
21
// Spaces change to "+" unless you pass usePlus=false.
22
// This is basically the same as encodeURIComponent in javascript.
23
NET_EXPORT std::string EscapeQueryParamValue(const std::string& text,
26
// Escapes a partial or complete file/pathname. This includes:
27
// non-printable, non-7bit, and (including space) "#%:<>?[\]^`{|}
28
// For the base::string16 version, we attempt a conversion to |codepage| before
29
// encoding the string. If this conversion fails, we return false.
30
NET_EXPORT std::string EscapePath(const std::string& path);
32
// Escapes application/x-www-form-urlencoded content. This includes:
33
// non-printable, non-7bit, and (including space) ?>=<;+'&%$#"![\]^`{|}
34
// Space is escaped as + (if use_plus is true) and other special characters
36
NET_EXPORT std::string EscapeUrlEncodedData(const std::string& path,
39
// Escapes all non-ASCII input.
40
NET_EXPORT std::string EscapeNonASCII(const std::string& input);
42
// Escapes characters in text suitable for use as an external protocol handler
44
// We %XX everything except alphanumerics and %-_.!~*'() and the restricted
45
// chracters (;/?:@&=+$,).
46
NET_EXPORT std::string EscapeExternalHandlerValue(const std::string& text);
48
// Appends the given character to the output string, escaping the character if
49
// the character would be interpretted as an HTML delimiter.
50
NET_EXPORT void AppendEscapedCharForHTML(char c, std::string* output);
52
// Escapes chars that might cause this text to be interpretted as HTML tags.
53
NET_EXPORT std::string EscapeForHTML(const std::string& text);
54
NET_EXPORT base::string16 EscapeForHTML(const base::string16& text);
56
// Unescaping ------------------------------------------------------------------
60
// A combination of the following flags that is passed to the unescaping
65
// Don't unescape anything at all.
68
// Don't unescape anything special, but all normal unescaping will happen.
69
// This is a placeholder and can't be combined with other flags (since it's
70
// just the absence of them). All other unescape rules imply "normal" in
71
// addition to their special meaning. Things like escaped letters, digits,
72
// and most symbols will get unescaped with this mode.
75
// Convert %20 to spaces. In some places where we're showing URLs, we may
76
// want this. In places where the URL may be copied and pasted out, then
77
// you wouldn't want this since it might not be interpreted in one piece
78
// by other applications.
81
// Unescapes various characters that will change the meaning of URLs,
82
// including '%', '+', '&', '/', '#'. If we unescaped these characters, the
83
// resulting URL won't be the same as the source one. This flag is used when
84
// generating final output like filenames for URLs where we won't be
85
// interpreting as a URL and want to do as much unescaping as possible.
86
URL_SPECIAL_CHARS = 4,
88
// Unescapes control characters such as %01. This INCLUDES NULLs. This is
89
// used for rare cases such as data: URL decoding where the result is binary
90
// data. You should not use this for normal URLs!
93
// URL queries use "+" for space. This flag controls that replacement.
94
REPLACE_PLUS_WITH_SPACE = 16,
98
// Unescapes |escaped_text| and returns the result.
99
// Unescaping consists of looking for the exact pattern "%XX", where each X is
100
// a hex digit, and converting to the character with the numerical value of
101
// those digits. Thus "i%20=%203%3b" unescapes to "i = 3;".
103
// Watch out: this doesn't necessarily result in the correct final result,
104
// because the encoding may be unknown. For example, the input might be ASCII,
105
// which, after unescaping, is supposed to be interpreted as UTF-8, and then
106
// converted into full UTF-16 chars. This function won't tell you if any
107
// conversions need to take place, it only unescapes.
108
NET_EXPORT std::string UnescapeURLComponent(const std::string& escaped_text,
109
UnescapeRule::Type rules);
110
NET_EXPORT base::string16 UnescapeURLComponent(
111
const base::string16& escaped_text,
112
UnescapeRule::Type rules);
114
// Unescapes the given substring as a URL, and then tries to interpret the
115
// result as being encoded as UTF-8. If the result is convertable into UTF-8, it
116
// will be returned as converted. If it is not, the original escaped string will
117
// be converted into a base::string16 and returned. (|offset[s]_for_adjustment|)
118
// specifies one or more offsets into the source strings; each offset will be
119
// adjusted to point at the same logical place in the result strings during
120
// decoding. If this isn't possible because an offset points past the end of
121
// the source strings or into the middle of a multibyte sequence, the offending
122
// offset will be set to string16::npos. |offset[s]_for_adjustment| may be NULL.
123
NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponent(
124
const std::string& text,
125
UnescapeRule::Type rules,
126
size_t* offset_for_adjustment);
127
NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponentWithOffsets(
128
const std::string& text,
129
UnescapeRule::Type rules,
130
std::vector<size_t>* offsets_for_adjustment);
132
// Unescapes the following ampersand character codes from |text|:
133
// < > & " '
134
NET_EXPORT base::string16 UnescapeForHTML(const base::string16& text);
138
// Private Functions (Exposed for Unit Testing) --------------------------------
140
// A function called by std::for_each that will adjust any offset which occurs
141
// after one or more encoded characters.
142
struct NET_EXPORT_PRIVATE AdjustEncodingOffset {
143
typedef std::vector<size_t> Adjustments;
145
explicit AdjustEncodingOffset(const Adjustments& adjustments);
146
void operator()(size_t& offset);
148
const Adjustments& adjustments;
151
} // namespace internal
155
#endif // NET_BASE_ESCAPE_H_