net/tools/dump_cache/url_utilities.cc

   1 // Copyright (c) 2010 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 #include "net/tools/dump_cache/url_utilities.h"
   6
   7 #include "base/logging.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "base/strings/string_util.h"
  10
  11 namespace net {
  12
  13 std::string UrlUtilities::GetUrlHost(const std::string& url) {
  14   size_t b = url.find("//");
  15   if (b == std::string::npos)
  16     b = 0;
  17   else
  18     b += 2;
  19   size_t next_slash = url.find_first_of('/', b);
  20   size_t next_colon = url.find_first_of(':', b);
  21   if (next_slash != std::string::npos
  22       && next_colon != std::string::npos
  23       && next_colon < next_slash) {
  24     return std::string(url, b, next_colon - b);
  25   }
  26   if (next_slash == std::string::npos) {
  27     if (next_colon != std::string::npos) {
  28       return std::string(url, b, next_colon - b);
  29     } else {
  30       next_slash = url.size();
  31     }
  32   }
  33   return std::string(url, b, next_slash - b);
  34 }
  35
  36 std::string UrlUtilities::GetUrlHostPath(const std::string& url) {
  37   size_t b = url.find("//");
  38   if (b == std::string::npos)
  39     b = 0;
  40   else
  41     b += 2;
  42   return std::string(url, b);
  43 }
  44
  45 std::string UrlUtilities::GetUrlPath(const std::string& url) {
  46   size_t b = url.find("//");
  47   if (b == std::string::npos)
  48     b = 0;
  49   else
  50     b += 2;
  51   b = url.find("/", b);
  52   if (b == std::string::npos)
  53     return "/";
  54
  55   size_t e = url.find("#", b+1);
  56   if (e != std::string::npos)
  57     return std::string(url, b, (e - b));
  58   return std::string(url, b);
  59 }
  60
  61 namespace {
  62
  63 // Parsing states for UrlUtilities::Unescape
  64 enum UnescapeState {
  65   NORMAL,   // We are not in the middle of parsing an escape.
  66   ESCAPE1,  // We just parsed % .
  67   ESCAPE2   // We just parsed %X for some hex digit X.
  68 };
  69
  70 }  // namespace
  71
  72 std::string UrlUtilities::Unescape(const std::string& escaped_url) {
  73   std::string unescaped_url, escape_text;
  74   int escape_value;
  75   UnescapeState state = NORMAL;
  76   std::string::const_iterator iter = escaped_url.begin();
  77   while (iter < escaped_url.end()) {
  78     char c = *iter;
  79     switch (state) {
  80       case NORMAL:
  81         if (c == '%') {
  82           escape_text.clear();
  83           state = ESCAPE1;
  84         } else {
  85           unescaped_url.push_back(c);
  86         }
  87         ++iter;
  88         break;
  89       case ESCAPE1:
  90         if (IsHexDigit(c)) {
  91           escape_text.push_back(c);
  92           state = ESCAPE2;
  93           ++iter;
  94         } else {
  95           // Unexpected, % followed by non-hex chars, pass it through.
  96           unescaped_url.push_back('%');
  97           state = NORMAL;
  98         }
  99         break;
 100       case ESCAPE2:
 101         if (IsHexDigit(c)) {
 102           escape_text.push_back(c);
 103           bool ok = base::HexStringToInt(escape_text, &escape_value);
 104           DCHECK(ok);
 105           unescaped_url.push_back(static_cast<unsigned char>(escape_value));
 106           state = NORMAL;
 107           ++iter;
 108         } else {
 109           // Unexpected, % followed by non-hex chars, pass it through.
 110           unescaped_url.push_back('%');
 111           unescaped_url.append(escape_text);
 112           state = NORMAL;
 113         }
 114         break;
 115     }
 116   }
 117   // Unexpected, % followed by end of string, pass it through.
 118   if (state == ESCAPE1 || state == ESCAPE2) {
 119     unescaped_url.push_back('%');
 120     unescaped_url.append(escape_text);
 121   }
 122   return unescaped_url;
 123 }
 124
 125 }  // namespace net
 126