* src/main.cc:

Added ENABLE_MESSAGE_DIGEST to skip checksum checking when the 
message
	digest support is not available.
	* src/MetalinkEntry.cc
	(check): Added ENABLE_MESSAGE_DIGEST. Return true if the message 
digest
	support is not available.

ChangeLog

@@ -21,10 +21,15 @@
 	* src/main.cc:
 	Added ENABLE_BITTORRENT around includes and blocks related to
 	BitTorrent.
+	Added ENABLE_MESSAGE_DIGEST to skip checksum checking when the message
+	digest support is not available.
 	* src/AbstractDiskWriter.h:
 	Replaced ENABLE_SHA1DIGEST with ENABLE_MESSAGE_DIGEST.
 	* src/AbstractDiskWriter.cc:
 	Replaced ENABLE_SHA1DIGEST with ENABLE_MESSAGE_DIGEST.
+	* src/MetalinkEntry.cc
+	(check): Added ENABLE_MESSAGE_DIGEST. Return true if the message digest
+	support is not available.
 	
 	To add command-line options for Metalink:
 

README

@@ -1,4 +1,4 @@
-aria2 - a simple utility for downloading files.
+aria2 - The high speed download utility
 
 1. Disclaimer
 -------------
@@ -22,6 +22,7 @@ aria2 is in very early development stage. Currently it has following features:
 * It can run as a daemon process.
 * BitTorrent protocol support with fast extension.
 * Selective download in multi-file torrent
+* Metalink version 3.0 support(http/ftp only).
 
 3. How to build
 ---------------
@@ -34,10 +35,15 @@ The executable is aria2c in src directory.
 -------------
 In order to enable HTTPS support, you need GNU TLS or OpenSSL.
 In order to enable BitTorrent support, you need GNU TLS+libgcrypt or OpenSSL.
+In order to enable Metalink support, you need libxml2. Optionally GNU TLS+
+libgcrypt or OpenSSL are required for checksum checking support(MD5, SHA1).
 
 GNU TLS has precedence over OpenSSL if both libraries are installed.
 If you prefer OpenSSL, run configure with "--without-gnutls".
 
+You can disable BitTorrent, Metalink support by providing --disable-bittorrent,
+--disable-metalink respectively to configure script.
+
 5. BitTorrrent
 --------------
 The filename of the downloaded file is determined as follows:
@@ -72,4 +78,15 @@ Note:
 * The ports aria2c uses are 6881-6999.
 * The maximum number of peers is 55.
 * After selective download completes, aria2 is going to download rest of the
-files.
+files.
+
+6. Metalink
+-----------
+The current implementation only supports http/ftp downloading in Metalink.
+BitTorrent and other p2p protocols are ignored.
+
+For checksum checking, both MD5 and SHA1 are supported. If both values are
+provided, then aria2 uses SHA1. If checksum checking is failed, aria2 doesn't
+retry the download and just exits with non-zero return code.
+
+The supported user preferences are version, language and os.

configure

@@ -4672,8 +4672,7 @@ fi
 
 fi
 
-if test "x$have_libxml2" = "xyes" && test "x$enable_metalink" = "xyes" && \
-   test "x$enable_message_digest" = "xyes"; then
+if test "x$have_libxml2" = "xyes" && test "x$enable_metalink" = "xyes"; then
 
 cat >>confdefs.h <<\_ACEOF
 #define ENABLE_METALINK 1

configure.ac

@@ -70,8 +70,7 @@ else
     AM_CONDITIONAL([ENABLE_BITTORRENT], false)
 fi
 
-if test "x$have_libxml2" = "xyes" && test "x$enable_metalink" = "xyes" && \
-   test "x$enable_message_digest" = "xyes"; then
+if test "x$have_libxml2" = "xyes" && test "x$enable_metalink" = "xyes"; then
     AC_DEFINE([ENABLE_METALINK], [1], [Define to 1 if Metalink support is enabled.])
     AM_CONDITIONAL([ENABLE_METALINK], true)
 else

src/MetalinkEntry.cc

@@ -30,6 +30,7 @@ MetalinkEntry::~MetalinkEntry() {
 }
 
 bool MetalinkEntry::check(const string& filename) const {
+#ifdef ENABLE_MESSAGE_DIGEST
   unsigned char buf[20];
   int digestLength;
   const string* digestPtr;
@@ -47,6 +48,9 @@ bool MetalinkEntry::check(const string& filename) const {
   }
   Util::fileChecksum(filename, buf, algo);
   return *digestPtr == Util::toHex(buf, digestLength);
+#else
+  return true;
+#endif //ENABLE_MESSAGE_DIGEST
 }
 
 class PrefOrder {

src/main.cc

@@ -790,12 +790,14 @@ int main(int argc, char* argv[]) {
     requests.clear();
 
     if(success) {
+#ifdef ENABLE_MESSAGE_DIGEST
       if(entry->check(downloadedFilename)) {
 	printf("checksum OK.\n");
       } else {
 	printf("checksum ERROR.\n");
 	exit(EXIT_FAILURE);
       }
+#endif // ENABLE_MESSAGE_DIGEST
     }
 
     delete metalinker;