url/url_file.h

   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_parse {
  14
  15 #ifdef WIN32
  16
  17 // We allow both "c:" and "c|" as drive identifiers.
  18 inline bool IsWindowsDriveSeparator(base::char16 ch) {
  19   return ch == ':' || ch == '|';
  20 }
  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>
  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>
  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>
  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_parse
  82
  83 #endif  // URL_URL_FILE_H_