handle torrents with duplicate filenames

ChangeLog

@@ -1,3 +1,4 @@
+	* handle torrents with duplicate filenames
 	* piece timeouts are adjusted to download rate limits
 	* encodes urls in torrent files that needs to be encoded
 	* fixed not passing &supportcrypto=1 when encryption is disabled

include/libtorrent/escape_string.hpp

@@ -50,6 +50,7 @@ namespace libtorrent
 	char TORRENT_EXPORT to_lower(char c);
 
 	bool TORRENT_EXPORT string_begins_no_case(char const* s1, char const* s2);
+	bool TORRENT_EXPORT string_equal_no_case(char const* s1, char const* s2);
 
 	std::string TORRENT_EXPORT unescape_string(std::string const& s, error_code& ec);
 	// replaces all disallowed URL characters by their %-encoding

src/escape_string.cpp

@@ -111,6 +111,17 @@ namespace libtorrent
 		return true;
 	}
 
+	bool string_equal_no_case(char const* s1, char const* s2)
+	{
+		while (to_lower(*s1) == to_lower(*s2))
+		{
+			if (*s1 == 0) return true;
+			++s1;
+			++s2;
+		}
+		return false;
+	}
+
 	std::string unescape_string(std::string const& s, error_code& ec)
 	{
 		std::string ret;

src/torrent_info.cpp

@@ -278,6 +278,22 @@ namespace libtorrent
 			file_entry e;
 			if (!extract_single_file(*list.list_at(i), e, root_dir))
 				return false;
+			int cnt = 0;
+			for (file_storage::iterator k = target.begin()
+				, end(target.end()); k != end; ++k)
+			{
+				if (string_equal_no_case(e.path.string().c_str()
+					, k->path.string().c_str())) ++cnt;
+			}
+			if (cnt)
+			{
+				char suffix[15];
+				snprintf(suffix, sizeof(suffix), ".%d", cnt);
+				e.path.replace_extension(suffix + e.path.extension());
+				// TODO: we should really make sure that this new name
+				// doesn't already exist as well, otherwise we might
+				// just create another collision
+			}
 			target.add_file(e);
 		}
 		return true;

src/upnp.cpp

@@ -746,17 +746,6 @@ namespace
 		dst.clear();
 		while (*src) dst.push_back(to_lower(*src++));
 	}
-	
-	bool string_equal_nocase(char const* lhs, char const* rhs)
-	{
-		while (to_lower(*lhs) == to_lower(*rhs))
-		{
-			if (*lhs == 0) return true;
-			++lhs;
-			++rhs;
-		}
-		return false;
-	}
 }
 
 struct parse_state
@@ -781,10 +770,10 @@ struct parse_state
 	{
 		std::list<std::string>::reverse_iterator i = tag_stack.rbegin();
 		if (i == tag_stack.rend()) return false;
-		if (!string_equal_nocase(i->c_str(), str2)) return false;
+		if (!string_equal_no_case(i->c_str(), str2)) return false;
 		++i;
 		if (i == tag_stack.rend()) return false;
-		if (!string_equal_nocase(i->c_str(), str1)) return false;
+		if (!string_equal_no_case(i->c_str(), str1)) return false;
 		return true;
 	}
 };
@@ -814,7 +803,7 @@ void find_control_url(int type, char const* string, parse_state& state)
 //		std::cout << " " << string << std::endl;
 		if (!state.in_service && state.top_tags("service", "servicetype"))
 		{
-			if (string_equal_nocase(string, state.service_type))
+			if (string_equal_no_case(string, state.service_type))
 				state.in_service = true;
 		}
 		else if (state.in_service && state.top_tags("service", "controlurl"))

test/test_primitives.cpp

@@ -423,6 +423,13 @@ int test_main()
 	TEST_CHECK(to_lower('-') == '-');
 	TEST_CHECK(to_lower('&') == '&');
 
+	// test string_equal_no_case
+
+	TEST_CHECK(string_equal_no_case("foobar", "FoobAR"));
+	TEST_CHECK(string_equal_no_case("foobar", "foobar"));
+	TEST_CHECK(!string_equal_no_case("foobar", "foobar "));
+	TEST_CHECK(!string_equal_no_case("foobar", "F00"));
+
 	// test string_begins_no_case
 
 	TEST_CHECK(string_begins_no_case("foobar", "FoobAR --"));