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      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_
     84