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
38namespace url_parse {
39
40#ifdef WIN32
41
42// We allow both "c:" and "c|" as drive identifiers.
43inline bool IsWindowsDriveSeparator(char16 ch) {
44  return ch == ':' || ch == '|';
45}
46inline 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.
54template<typename CHAR>
55inline 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|.
70template<typename CHAR>
71inline 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.
90template<typename CHAR>
91inline 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