1 // Copyright (c) 2009 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 NET_TOOLS_DUMP_CACHE_URL_TO_FILE_ENCODER_H_ 6 #define NET_TOOLS_DUMP_CACHE_URL_TO_FILE_ENCODER_H_ 7 8 #include <string> 9 10 #include "base/file_path.h" 11 #include "base/file_util.h" 12 #include "base/string_util.h" 13 #include "googleurl/src/gurl.h" 14 15 namespace net { 16 17 // Helper class for converting a URL into a filename. 18 class UrlToFilenameEncoder { 19 public: 20 // Given a |url| and a |base_path|, returns a FilePath which represents this 21 // |url|. 22 static FilePath Encode(const std::string& url, FilePath base_path) { 23 std::string clean_url(url); 24 if (clean_url.length() && clean_url[clean_url.length()-1] == '/') 25 clean_url.append("index.html"); 26 27 GURL gurl(clean_url); 28 FilePath filename(base_path); 29 filename = filename.AppendASCII(gurl.host()); 30 31 std::string url_filename = gurl.PathForRequest(); 32 // Strip the leading '/' 33 if (url_filename[0] == '/') 34 url_filename = url_filename.substr(1); 35 36 // replace '/' with '\' 37 ConvertToSlashes(&url_filename); 38 39 // strip double slashes ("\\") 40 StripDoubleSlashes(&url_filename); 41 42 // Save path as filesystem-safe characters 43 url_filename = Escape(url_filename); 44 filename = filename.AppendASCII(url_filename); 45 46 return filename; 47 } 48 49 private: 50 // This is the length at which we chop individual subdirectories. 51 // Technically, we shouldn't need to do this, but I found that 52 // even with long-filename support, windows had trouble creating 53 // long subdirectories, and making them shorter helps. 54 static const size_t kMaximumSubdirectoryLength = 128; 55 56 // Escape the given input |path| and chop any individual components 57 // of the path which are greater than kMaximumSubdirectoryLength characters 58 // into two chunks. 59 static std::string Escape(const std::string& path) { 60 std::string output; 61 int last_slash = 0; 62 for (size_t index = 0; index < path.length(); index++) { 63 char ch = path[index]; 64 if (ch == 0x5C) 65 last_slash = index; 66 if ((ch == 0x2D) || // hyphen 67 (ch == 0x5C) || (ch == 0x5F) || // backslash, underscore 68 ((0x30 <= ch) && (ch <= 0x39)) || // Digits [0-9] 69 ((0x41 <= ch) && (ch <= 0x5A)) || // Uppercase [A-Z] 70 ((0x61 <= ch) && (ch <= 0x7A))) { // Lowercase [a-z] 71 output.append(&path[index],1); 72 } else { 73 char encoded[3]; 74 encoded[0] = 'x'; 75 encoded[1] = ch / 16; 76 encoded[1] += (encoded[1] >= 10) ? 'A' - 10 : '0'; 77 encoded[2] = ch % 16; 78 encoded[2] += (encoded[2] >= 10) ? 'A' - 10 : '0'; 79 output.append(encoded, 3); 80 } 81 if (index - last_slash > kMaximumSubdirectoryLength) { 82 char backslash = '\\'; 83 output.append(&backslash, 1); 84 last_slash = index; 85 } 86 } 87 return output; 88 } 89 90 // Replace all instances of |from| within |str| as |to|. 91 static void ReplaceAll(const std::string& from, 92 const std::string& to, 93 std::string* str) { 94 std::string::size_type pos(0); 95 while((pos = str->find(from, pos)) != std::string::npos) { 96 str->replace(pos, from.size(), to); 97 pos += from.size(); 98 } 99 } 100 101 // Replace all instances of "/" with "\" in |path|. 102 static void ConvertToSlashes(std::string* path) { 103 static const char slash[] = { '/', '\0' }; 104 static const char backslash[] = { '\\', '\0' }; 105 ReplaceAll(slash, backslash, path); 106 } 107 108 // Replace all instances of "\\" with "%5C%5C" in |path|. 109 static void StripDoubleSlashes(std::string* path) { 110 static const char doubleslash[] = { '\\', '\\', '\0' }; 111 static const char escaped_doubleslash[] = 112 { '%', '5', 'C', '%', '5', 'C','\0' }; 113 ReplaceAll(doubleslash, escaped_doubleslash, path); 114 } 115 }; 116 117 } // namespace net 118 119 #endif // NET_TOOLS_DUMP_CACHE_URL_TO_FILE_ENCODER_H__ 120 121
