1 // Copyright 2007, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 // Provides shared functions used by the internals of the parser and
31 // canonicalizer for file URLs. Do not use outside of these modules.
32
33 #ifndef GOOGLEURL_SRC_URL_FILE_H__
34 #define GOOGLEURL_SRC_URL_FILE_H__
35
36 #include "googleurl/src/url_parse_internal.h"
37
38 namespace url_parse {
39
40 #ifdef WIN32
41
42 // We allow both "c:" and "c|" as drive identifiers.
IsWindowsDriveSeparator(char16 ch)43 inline bool IsWindowsDriveSeparator(char16 ch) {
44 return ch == ':' || ch == '|';
45 }
IsWindowsDriveLetter(char16 ch)46 inline bool IsWindowsDriveLetter(char16 ch) {
47 return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
48 }
49
50 #endif // WIN32
51
52 // Returns the index of the next slash in the input after the given index, or
53 // spec_len if the end of the input is reached.
54 template<typename CHAR>
FindNextSlash(const CHAR * spec,int begin_index,int spec_len)55 inline int FindNextSlash(const CHAR* spec, int begin_index, int spec_len) {
56 int idx = begin_index;
57 while (idx < spec_len && !IsURLSlash(spec[idx]))
58 idx++;
59 return idx;
60 }
61
62 #ifdef WIN32
63
64 // Returns true if the start_offset in the given spec looks like it begins a
65 // drive spec, for example "c:". This function explicitly handles start_offset
66 // values that are equal to or larger than the spec_len to simplify callers.
67 //
68 // If this returns true, the spec is guaranteed to have a valid drive letter
69 // plus a colon starting at |start_offset|.
70 template<typename CHAR>
DoesBeginWindowsDriveSpec(const CHAR * spec,int start_offset,int spec_len)71 inline bool DoesBeginWindowsDriveSpec(const CHAR* spec, int start_offset,
72 int spec_len) {
73 int remaining_len = spec_len - start_offset;
74 if (remaining_len < 2)
75 return false; // Not enough room.
76 if (!IsWindowsDriveLetter(spec[start_offset]))
77 return false; // Doesn't start with a valid drive letter.
78 if (!IsWindowsDriveSeparator(spec[start_offset + 1]))
79 return false; // Isn't followed with a drive separator.
80 return true;
81 }
82
83 // Returns true if the start_offset in the given text looks like it begins a
84 // UNC path, for example "\\". This function explicitly handles start_offset
85 // values that are equal to or larger than the spec_len to simplify callers.
86 //
87 // When strict_slashes is set, this function will only accept backslashes as is
88 // standard for Windows. Otherwise, it will accept forward slashes as well
89 // which we use for a lot of URL handling.
90 template<typename CHAR>
DoesBeginUNCPath(const CHAR * text,int start_offset,int len,bool strict_slashes)91 inline bool DoesBeginUNCPath(const CHAR* text,
92 int start_offset,
93 int len,
94 bool strict_slashes) {
95 int remaining_len = len - start_offset;
96 if (remaining_len < 2)
97 return false;
98
99 if (strict_slashes)
100 return text[start_offset] == '\\' && text[start_offset + 1] == '\\';
101 return IsURLSlash(text[start_offset]) && IsURLSlash(text[start_offset + 1]);
102 }
103
104 #endif // WIN32
105
106 } // namespace url_parse
107
108 #endif // GOOGLEURL_SRC_URL_FILE_H__
109