123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101 |
- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef URL_URL_FILE_H_
- #define URL_URL_FILE_H_
- // Provides shared functions used by the internals of the parser and
- // canonicalizer for file URLs. Do not use outside of these modules.
- #include "base/strings/string_util.h"
- #include "url/url_parse_internal.h"
- namespace url {
- // We allow both "c:" and "c|" as drive identifiers.
- inline bool IsWindowsDriveSeparator(char16_t ch) {
- return ch == ':' || ch == '|';
- }
- inline bool IsWindowsDriveSeparator(char ch) {
- return IsWindowsDriveSeparator(static_cast<char16_t>(ch));
- }
- // Returns the index of the next slash in the input after the given index, or
- // spec_len if the end of the input is reached.
- template<typename CHAR>
- inline int FindNextSlash(const CHAR* spec, int begin_index, int spec_len) {
- int idx = begin_index;
- while (idx < spec_len && !IsURLSlash(spec[idx]))
- idx++;
- return idx;
- }
- // DoesContainWindowsDriveSpecUntil returns the least number between
- // start_offset and max_offset such that the spec has a valid drive
- // specification starting at that offset. Otherwise it returns -1. This function
- // gracefully handles, by returning -1, start_offset values that are equal to or
- // larger than the spec_len, and caps max_offset appropriately to simplify
- // callers. max_offset must be at least start_offset.
- template <typename CHAR>
- inline int DoesContainWindowsDriveSpecUntil(const CHAR* spec,
- int start_offset,
- int max_offset,
- int spec_len) {
- CHECK_LE(start_offset, max_offset);
- if (start_offset > spec_len - 2)
- return -1; // Not enough room.
- if (max_offset > spec_len - 2)
- max_offset = spec_len - 2;
- for (int offset = start_offset; offset <= max_offset; ++offset) {
- if (!base::IsAsciiAlpha(spec[offset]))
- continue; // Doesn't contain a valid drive letter.
- if (!IsWindowsDriveSeparator(spec[offset + 1]))
- continue; // Isn't followed with a drive separator.
- return offset;
- }
- return -1;
- }
- // Returns true if the start_offset in the given spec looks like it begins a
- // drive spec, for example "c:". This function explicitly handles start_offset
- // values that are equal to or larger than the spec_len to simplify callers.
- //
- // If this returns true, the spec is guaranteed to have a valid drive letter
- // plus a drive letter separator (a colon or a pipe) starting at |start_offset|.
- template <typename CHAR>
- inline bool DoesBeginWindowsDriveSpec(const CHAR* spec,
- int start_offset,
- int spec_len) {
- return DoesContainWindowsDriveSpecUntil(spec, start_offset, start_offset,
- spec_len) == start_offset;
- }
- #ifdef WIN32
- // Returns true if the start_offset in the given text looks like it begins a
- // UNC path, for example "\\". This function explicitly handles start_offset
- // values that are equal to or larger than the spec_len to simplify callers.
- //
- // When strict_slashes is set, this function will only accept backslashes as is
- // standard for Windows. Otherwise, it will accept forward slashes as well
- // which we use for a lot of URL handling.
- template<typename CHAR>
- inline bool DoesBeginUNCPath(const CHAR* text,
- int start_offset,
- int len,
- bool strict_slashes) {
- int remaining_len = len - start_offset;
- if (remaining_len < 2)
- return false;
- if (strict_slashes)
- return text[start_offset] == '\\' && text[start_offset + 1] == '\\';
- return IsURLSlash(text[start_offset]) && IsURLSlash(text[start_offset + 1]);
- }
- #endif // WIN32
- } // namespace url
- #endif // URL_URL_FILE_H_
|