1 // Copyright 2013 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.
4
5 #ifndef URL_URL_FILE_H_
6 #define URL_URL_FILE_H_
7
8 // Provides shared functions used by the internals of the parser and
9 // canonicalizer for file URLs. Do not use outside of these modules.
10
11 #include "url/url_parse_internal.h"
12
13 namespace url {
14
15 #ifdef WIN32
16
17 // We allow both "c:" and "c|" as drive identifiers.
IsWindowsDriveSeparator(base::char16 ch)18 inline bool IsWindowsDriveSeparator(base::char16 ch) {
19 return ch == ':' || ch == '|';
20 }
IsWindowsDriveLetter(base::char16 ch)21 inline bool IsWindowsDriveLetter(base::char16 ch) {
22 return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
23 }
24
25 #endif // WIN32
26
27 // Returns the index of the next slash in the input after the given index, or
28 // spec_len if the end of the input is reached.
29 template<typename CHAR>
FindNextSlash(const CHAR * spec,int begin_index,int spec_len)30 inline int FindNextSlash(const CHAR* spec, int begin_index, int spec_len) {
31 int idx = begin_index;
32 while (idx < spec_len && !IsURLSlash(spec[idx]))
33 idx++;
34 return idx;
35 }
36
37 #ifdef WIN32
38
39 // Returns true if the start_offset in the given spec looks like it begins a
40 // drive spec, for example "c:". This function explicitly handles start_offset
41 // values that are equal to or larger than the spec_len to simplify callers.
42 //
43 // If this returns true, the spec is guaranteed to have a valid drive letter
44 // plus a colon starting at |start_offset|.
45 template<typename CHAR>
DoesBeginWindowsDriveSpec(const CHAR * spec,int start_offset,int spec_len)46 inline bool DoesBeginWindowsDriveSpec(const CHAR* spec, int start_offset,
47 int spec_len) {
48 int remaining_len = spec_len - start_offset;
49 if (remaining_len < 2)
50 return false; // Not enough room.
51 if (!IsWindowsDriveLetter(spec[start_offset]))
52 return false; // Doesn't start with a valid drive letter.
53 if (!IsWindowsDriveSeparator(spec[start_offset + 1]))
54 return false; // Isn't followed with a drive separator.
55 return true;
56 }
57
58 // Returns true if the start_offset in the given text looks like it begins a
59 // UNC path, for example "\\". This function explicitly handles start_offset
60 // values that are equal to or larger than the spec_len to simplify callers.
61 //
62 // When strict_slashes is set, this function will only accept backslashes as is
63 // standard for Windows. Otherwise, it will accept forward slashes as well
64 // which we use for a lot of URL handling.
65 template<typename CHAR>
DoesBeginUNCPath(const CHAR * text,int start_offset,int len,bool strict_slashes)66 inline bool DoesBeginUNCPath(const CHAR* text,
67 int start_offset,
68 int len,
69 bool strict_slashes) {
70 int remaining_len = len - start_offset;
71 if (remaining_len < 2)
72 return false;
73
74 if (strict_slashes)
75 return text[start_offset] == '\\' && text[start_offset + 1] == '\\';
76 return IsURLSlash(text[start_offset]) && IsURLSlash(text[start_offset + 1]);
77 }
78
79 #endif // WIN32
80
81 } // namespace url
82
83 #endif // URL_URL_FILE_H_
84