2010-01-22 Tatsuhiro Tsujikawa <t-tujikawa@users.sourceforge.net>

	aria2 now returns gzip compressed XML-RPC response if XML-RPC
	client accepts gzip content encoding.
	* src/A2STR.cc
	* src/A2STR.h
	* src/GZipEncoder.cc
	* src/GZipEncoder.h
	* src/HttpHeader.cc
	* src/HttpHeader.h
	* src/HttpServer.cc
	* src/HttpServer.h
	* src/HttpServerBodyCommand.cc
	* src/HttpServerCommand.cc
	* src/Makefile.am
	* src/XmlRpcResponse.cc
	* src/XmlRpcResponse.h
	* test/GZipEncoderTest.cc
	* test/Makefile.am

14 files changed, 340 insertions, 37 deletions

diff --git a/src/A2STR.cc b/src/A2STR.cc
index dbe3c238..bcd6d76f 100644
--- a/src/A2STR.cc
+++ b/src/A2STR.cc
@@ -60,4 +60,6 @@ const std::string A2STR::UNDERSCORE_C("_");
 
 const std::string A2STR::BACK_SLASH_C("\\");
 
+const std::string A2STR::COMMA_C(",");
+
 } // namespace aria2
diff --git a/src/A2STR.h b/src/A2STR.h
index ebd00584..1eb94e98 100644
--- a/src/A2STR.h
+++ b/src/A2STR.h
@@ -66,6 +66,8 @@ public:
   static const std::string UNDERSCORE_C;
 
   static const std::string BACK_SLASH_C;
+
+  static const std::string COMMA_C;
 };
 } // namespace aria2
 
diff --git a/src/GZipEncoder.cc b/src/GZipEncoder.cc
new file mode 100644
index 00000000..0f605b66
--- /dev/null
+++ b/src/GZipEncoder.cc
@@ -0,0 +1,145 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "GZipEncoder.h"
+
+#include <cstring>
+
+#include "StringFormat.h"
+#include "DlAbortEx.h"
+#include "util.h"
+
+namespace aria2 {
+
+namespace {
+const int OUTBUF_LENGTH = 4096;
+}
+
+GZipEncoder::GZipEncoder():_strm(0), _finished(false) {}
+
+GZipEncoder::~GZipEncoder()
+{
+  release();
+}
+
+void GZipEncoder::init()
+{
+  _finished = false;
+  release();
+  _strm = new z_stream();
+  _strm->zalloc = Z_NULL;
+  _strm->zfree = Z_NULL;
+  _strm->opaque = Z_NULL;
+  _strm->avail_in = 0;
+  _strm->next_in = Z_NULL;
+
+  if(Z_OK != deflateInit2(_strm, 9, Z_DEFLATED, 31, 9, Z_DEFAULT_STRATEGY)) {
+    throw DL_ABORT_EX("Initializing z_stream failed.");
+  }
+}
+
+void GZipEncoder::release()
+{
+  if(_strm) {
+    deflateEnd(_strm);
+    delete _strm;
+    _strm = 0;
+  }
+}
+
+std::string GZipEncoder::encode
+(const unsigned char* in, size_t length, int flush)
+{
+  std::string out;
+
+  _strm->avail_in = length;
+  _strm->next_in = const_cast<unsigned char*>(in);
+
+  unsigned char outbuf[OUTBUF_LENGTH];
+  while(1) {
+    _strm->avail_out = OUTBUF_LENGTH;
+    _strm->next_out = outbuf;
+
+    int ret = ::deflate(_strm, flush);
+
+    if(ret == Z_STREAM_END) {
+      _finished = true;
+    } else if(ret != Z_OK) {
+      throw DL_ABORT_EX(StringFormat("libz::deflate() failed. cause:%s",
+                                     _strm->msg).str());
+    }
+
+    size_t produced = OUTBUF_LENGTH-_strm->avail_out;
+
+    out.append(&outbuf[0], &outbuf[produced]);
+
+    if(_strm->avail_out > 0) {
+      break;
+    }
+  }
+  return out;
+}
+
+bool GZipEncoder::finished()
+{
+  return _finished;
+}
+
+std::string GZipEncoder::str()
+{
+  _internalBuf += encode(0, 0, Z_FINISH);
+  return _internalBuf;
+}
+
+GZipEncoder& GZipEncoder::operator<<(const char* s)
+{
+  _internalBuf += encode(reinterpret_cast<const unsigned char*>(s), strlen(s));
+  return *this;
+}
+
+GZipEncoder& GZipEncoder::operator<<(const std::string& s)
+{
+  _internalBuf += encode
+    (reinterpret_cast<const unsigned char*>(s.data()), s.size());
+  return *this;
+}
+
+GZipEncoder& GZipEncoder::operator<<(int64_t i)
+{
+  std::string s = util::itos(i);
+  (*this) << s;
+  return *this;
+}
+
+} // namespace aria2
diff --git a/src/GZipEncoder.h b/src/GZipEncoder.h
new file mode 100644
index 00000000..4336b271
--- /dev/null
+++ b/src/GZipEncoder.h
@@ -0,0 +1,96 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _D_GZIP_ENCODER_H_
+#define _D_GZIP_ENCODER_H_
+
+#include <string>
+
+#include <zlib.h>
+
+namespace aria2 {
+
+class GZipEncoder {
+private:
+  z_stream* _strm;
+
+  bool _finished;
+
+  // Internal buffer for deflated data.
+  std::string _internalBuf;
+
+  std::string encode(const unsigned char* in, size_t length, int flush);
+public:
+  GZipEncoder();
+
+  ~GZipEncoder();
+
+  // Initializes deflator.
+  void init();
+
+  // Feeds NULL-terminated c-string s to deflater.  The deflated
+  // result is kept in this class.
+  GZipEncoder& operator<<(const char* s);
+
+  // Feeds binary data in s to deflater.  The deflated result is kept
+  // in this class.
+  GZipEncoder& operator<<(const std::string& s);
+
+  // Feeds integer to deflator. Before passed to deflator, i is
+  // converted to std::string using util::itos().  The deflated result
+  // is kept in this class.
+  GZipEncoder& operator<<(int64_t i);
+
+  // Feeds binary data pointed by in with size length to deflator and
+  // returns compressed output available so far.  Don't use this
+  // method with operator<< methods.
+  std::string encode(const unsigned char* in, size_t length)
+  {
+    return encode(in, length, Z_NO_FLUSH);
+  }
+
+  // Returns true if deflator finished.
+  bool finished();
+
+  // Releases allocated resources.
+  void release();
+
+  // Returns deflated result kept internally. After this function
+  // call, further calls to operator<<() and encode() are not allowed.
+  std::string str();
+};
+
+} // namespace aria2
+
+#endif // _D_GZIP_ENCODER_H_
diff --git a/src/HttpHeader.cc b/src/HttpHeader.cc
index 17b042ff..635cca5c 100644
--- a/src/HttpHeader.cc
+++ b/src/HttpHeader.cc
@@ -72,6 +72,8 @@ const std::string HttpHeader::CONTENT_RANGE("Content-Range");
 
 const std::string HttpHeader::LAST_MODIFIED("Last-Modified");
 
+const std::string HttpHeader::ACCEPT_ENCODING("Accept-Encoding");
+
 const std::string HttpHeader::HTTP_1_1("HTTP/1.1");
 
 const std::string HttpHeader::S200("200");
diff --git a/src/HttpHeader.h b/src/HttpHeader.h
index aff2b07c..1a42ff4b 100644
--- a/src/HttpHeader.h
+++ b/src/HttpHeader.h
@@ -140,6 +140,8 @@ public:
 
   static const std::string LAST_MODIFIED;
 
+  static const std::string ACCEPT_ENCODING;
+
   static const std::string HTTP_1_1;
 
   static const std::string S200;
diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index 12ad34a2..16efce3c 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -56,7 +56,10 @@ HttpServer::HttpServer(const SharedHandle<SocketCore>& socket,
   _e(e),
   _headerProcessor(new HttpHeaderProcessor()),
   _logger(LogFactory::getInstance()),
-  _keepAlive(true)
+  _keepAlive(true),
+  _gzip(false),
+  _acceptsPersistentConnection(true),
+  _acceptsGZip(false)
 {}
 
 HttpServer::~HttpServer() {}
@@ -88,8 +91,21 @@ SharedHandle<HttpHeader> HttpServer::receiveRequest()
     _lastContentLength =
       _lastRequestHeader->getFirstAsUInt(HttpHeader::CONTENT_LENGTH);
     _headerProcessor->clear();
-  }
 
+    std::string connection =
+      util::toLower(_lastRequestHeader->getFirst(HttpHeader::CONNECTION));
+    _acceptsPersistentConnection =
+      connection.find(HttpHeader::CLOSE) == std::string::npos &&
+      (_lastRequestHeader->getVersion() == HttpHeader::HTTP_1_1 ||
+       connection.find("keep-alive") != std::string::npos);
+
+    std::vector<std::string> acceptEncodings;
+    util::split(_lastRequestHeader->getFirst(HttpHeader::ACCEPT_ENCODING),
+                std::back_inserter(acceptEncodings), A2STR::COMMA_C, true);
+    _acceptsGZip =
+      std::find(acceptEncodings.begin(), acceptEncodings.end(), "gzip")
+      != acceptEncodings.end();
+  }
   return header;
 }
 
@@ -121,20 +137,6 @@ const std::string& HttpServer::getRequestPath() const
   return _lastRequestHeader->getRequestPath();
 }
 
-bool HttpServer::supportsPersistentConnection() const
-{
-  if(!_keepAlive) {
-    return false;
-  }
-
-  std::string connection =
-    util::toLower(_lastRequestHeader->getFirst(HttpHeader::CONNECTION));
-
-  return connection.find(HttpHeader::CLOSE) == std::string::npos &&
-    (_lastRequestHeader->getVersion() == HttpHeader::HTTP_1_1 ||
-     connection.find("keep-alive") != std::string::npos);
-}
-
 void HttpServer::feedResponse(const std::string& text, const std::string& contentType)
 {
   feedResponse("200 OK", "", text, contentType);
@@ -149,7 +151,9 @@ void HttpServer::feedResponse(const std::string& status,
   strappend(header, status, "\r\n",
             "Content-Type: ", contentType, "\r\n",
             "Content-Length: ", util::uitos(text.size()), "\r\n");
-
+  if(supportsGZip()) {
+    header += "Content-Encoding: gzip\r\n";
+  }
   if(!supportsPersistentConnection()) {
     header += "Connection: close\r\n";
   }
diff --git a/src/HttpServer.h b/src/HttpServer.h
index 8fc57386..604eb717 100644
--- a/src/HttpServer.h
+++ b/src/HttpServer.h
@@ -39,6 +39,7 @@
 
 #include <string>
 #include <sstream>
+#include <vector>
 
 #include "SharedHandle.h"
 #include "SocketBuffer.h"
@@ -62,8 +63,11 @@ private:
   uint64_t _lastContentLength;
   std::stringstream _lastBody;
   bool _keepAlive;
+  bool _gzip;
   std::string _username;
   std::string _password;
+  bool _acceptsPersistentConnection;
+  bool _acceptsGZip;
 public:
   HttpServer(const SharedHandle<SocketCore>& socket, DownloadEngine* e);
 
@@ -97,12 +101,24 @@ public:
 
   bool sendBufferIsEmpty() const;
 
-  bool supportsPersistentConnection() const;
+  bool supportsPersistentConnection() const
+  {
+    return _keepAlive && _acceptsPersistentConnection;
+  }
+
+  bool supportsGZip() const
+  {
+    return _gzip && _acceptsGZip;
+  }
 
   void enableKeepAlive() { _keepAlive = true; }
 
   void disableKeepAlive() { _keepAlive = false; }
 
+  void enableGZip() { _gzip = true; }
+
+  void disableGZip() { _gzip = false; }
+
   uint64_t getContentLength() const { return _lastContentLength; }
 };
 
diff --git a/src/HttpServerBodyCommand.cc b/src/HttpServerBodyCommand.cc
index 07ac5d7a..25eeab47 100644
--- a/src/HttpServerBodyCommand.cc
+++ b/src/HttpServerBodyCommand.cc
@@ -90,7 +90,9 @@ bool HttpServerBodyCommand::execute()
           SharedHandle<xmlrpc::XmlRpcMethod> method =
             xmlrpc::XmlRpcMethodFactory::create(req._methodName);
           xmlrpc::XmlRpcResponse res = method->execute(req, _e);
-          _httpServer->feedResponse(res.toXml(), "text/xml");
+          bool gzip = _httpServer->supportsGZip();
+          std::string responseData = res.toXml(gzip);
+          _httpServer->feedResponse(responseData, "text/xml");
           Command* command =
             new HttpServerResponseCommand(cuid, _httpServer, _e, _socket);
           _e->commands.push_back(command);
diff --git a/src/HttpServerCommand.cc b/src/HttpServerCommand.cc
index 03edd761..4a6bec49 100644
--- a/src/HttpServerCommand.cc
+++ b/src/HttpServerCommand.cc
@@ -61,6 +61,11 @@ HttpServerCommand::HttpServerCommand(int32_t cuid, DownloadEngine* e,
   _e->addSocketForReadCheck(_socket, this);
   _httpServer->setUsernamePassword(_e->option->get(PREF_XML_RPC_USER),
                                    _e->option->get(PREF_XML_RPC_PASSWD));
+#ifdef HAVE_LIBZ
+  _httpServer->enableGZip();
+#else // !HAVE_LIBZ
+  _httpServer->disableGZip();
+#endif // !HAVE_LIBZ
 }
 
 HttpServerCommand::HttpServerCommand(int32_t cuid,
diff --git a/src/Makefile.am b/src/Makefile.am
index 93868128..b49eb8c4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -252,7 +252,8 @@ SRCS += LibsslTLSContext.cc LibsslTLSContext.h
 endif # HAVE_LIBSSL
 
 if HAVE_LIBZ
-SRCS += GZipDecoder.cc GZipDecoder.h
+SRCS += GZipDecoder.cc GZipDecoder.h\
+	GZipEncoder.cc GZipEncoder.h
 endif # HAVE_LIBZ
 
 if HAVE_SQLITE3
diff --git a/src/Makefile.in b/src/Makefile.in
index dd6ea663..8d1c9301 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -61,7 +61,9 @@ bin_PROGRAMS = aria2c$(EXEEXT)
 @ENABLE_SSL_TRUE@am__append_6 = TLSContext.h
 @HAVE_LIBGNUTLS_TRUE@am__append_7 = LibgnutlsTLSContext.cc LibgnutlsTLSContext.h
 @HAVE_LIBSSL_TRUE@am__append_8 = LibsslTLSContext.cc LibsslTLSContext.h
-@HAVE_LIBZ_TRUE@am__append_9 = GZipDecoder.cc GZipDecoder.h
+@HAVE_LIBZ_TRUE@am__append_9 = GZipDecoder.cc GZipDecoder.h\
+@HAVE_LIBZ_TRUE@	GZipEncoder.cc GZipEncoder.h
+
 @HAVE_SQLITE3_TRUE@am__append_10 = Sqlite3MozCookieParser.cc Sqlite3MozCookieParser.h
 @ENABLE_ASYNC_DNS_TRUE@am__append_11 = AsyncNameResolver.cc AsyncNameResolver.h
 @ENABLE_MESSAGE_DIGEST_TRUE@am__append_12 = IteratableChunkChecksumValidator.cc IteratableChunkChecksumValidator.h\
@@ -441,9 +443,10 @@ am__libaria2c_a_SOURCES_DIST = Socket.h SocketCore.cc SocketCore.h \
 	EpollEventPoll.cc EpollEventPoll.h TLSContext.h \
 	LibgnutlsTLSContext.cc LibgnutlsTLSContext.h \
 	LibsslTLSContext.cc LibsslTLSContext.h GZipDecoder.cc \
-	GZipDecoder.h Sqlite3MozCookieParser.cc \
-	Sqlite3MozCookieParser.h AsyncNameResolver.cc \
-	AsyncNameResolver.h IteratableChunkChecksumValidator.cc \
+	GZipDecoder.h GZipEncoder.cc GZipEncoder.h \
+	Sqlite3MozCookieParser.cc Sqlite3MozCookieParser.h \
+	AsyncNameResolver.cc AsyncNameResolver.h \
+	IteratableChunkChecksumValidator.cc \
 	IteratableChunkChecksumValidator.h \
 	IteratableChecksumValidator.cc IteratableChecksumValidator.h \
 	CheckIntegrityDispatcherCommand.cc \
@@ -607,7 +610,8 @@ am__libaria2c_a_SOURCES_DIST = Socket.h SocketCore.cc SocketCore.h \
 am__objects_6 =
 @HAVE_LIBGNUTLS_TRUE@am__objects_7 = LibgnutlsTLSContext.$(OBJEXT)
 @HAVE_LIBSSL_TRUE@am__objects_8 = LibsslTLSContext.$(OBJEXT)
-@HAVE_LIBZ_TRUE@am__objects_9 = GZipDecoder.$(OBJEXT)
+@HAVE_LIBZ_TRUE@am__objects_9 = GZipDecoder.$(OBJEXT) \
+@HAVE_LIBZ_TRUE@	GZipEncoder.$(OBJEXT)
 @HAVE_SQLITE3_TRUE@am__objects_10 = Sqlite3MozCookieParser.$(OBJEXT)
 @ENABLE_ASYNC_DNS_TRUE@am__objects_11 = AsyncNameResolver.$(OBJEXT)
 @ENABLE_MESSAGE_DIGEST_TRUE@am__objects_12 = IteratableChunkChecksumValidator.$(OBJEXT) \
@@ -1437,6 +1441,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/FtpTunnelRequestCommand.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/FtpTunnelResponseCommand.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/GZipDecoder.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/GZipEncoder.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/GrowSegment.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/HandshakeExtensionMessage.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/HaveEraseCommand.Po@am__quote@
diff --git a/src/XmlRpcResponse.cc b/src/XmlRpcResponse.cc
index b37247fb..94e80384 100644
--- a/src/XmlRpcResponse.cc
+++ b/src/XmlRpcResponse.cc
@@ -38,16 +38,20 @@
 #include <sstream>
 
 #include "util.h"
+#ifdef HAVE_LIBZ
+# include "GZipEncoder.h"
+#endif // HAVE_LIBZ
 
 namespace aria2 {
 
 namespace xmlrpc {
 
-static void encodeValue(const BDE& value, std::ostream& o);
+template<typename OutputStream>
+static void encodeValue(const BDE& value, OutputStream& o);
 
-template<typename InputIterator>
+template<typename InputIterator, typename OutputStream>
 static void encodeArray
-(InputIterator first, InputIterator last, std::ostream& o)
+(InputIterator first, InputIterator last, OutputStream& o)
 {
   o << "<array>" << "<data>";
   for(; first != last; ++first) {
@@ -56,9 +60,9 @@ static void encodeArray
   o << "</data>" << "</array>";
 }
 
-template<typename InputIterator>
+template<typename InputIterator, typename OutputStream>
 static void encodeStruct
-(InputIterator first, InputIterator last, std::ostream& o)
+(InputIterator first, InputIterator last, OutputStream& o)
 {
   o << "<struct>";
   for(; first != last; ++first) {
@@ -70,7 +74,8 @@ static void encodeStruct
   o << "</struct>";
 }
 
-static void encodeValue(const BDE& value, std::ostream& o)
+template<typename OutputStream>
+static void encodeValue(const BDE& value, OutputStream& o)
 {
   o << "<value>";
   if(value.isString()) {
@@ -85,23 +90,39 @@ static void encodeValue(const BDE& value, std::ostream& o)
   o << "</value>";
 }
 
-std::string XmlRpcResponse::toXml() const
+template<typename OutputStream>
+std::string encodeAll(OutputStream& o, int code, const BDE& param)
 {
-  std::stringstream o;
   o << "<?xml version=\"1.0\"?>" << "<methodResponse>";
-  if(_code == 0) {
+  if(code == 0) {
     o << "<params>" << "<param>";
-    encodeValue(_param, o);
+    encodeValue(param, o);
     o << "</param>" << "</params>";
   } else {
     o << "<fault>";
-    encodeValue(_param, o);
+    encodeValue(param, o);
     o << "</fault>";
   }
   o << "</methodResponse>";
   return o.str();
 }
 
+std::string XmlRpcResponse::toXml(bool gzip) const
+{
+  if(gzip) {
+#ifdef HAVE_LIBZ
+    GZipEncoder o;
+    o.init();
+    return encodeAll(o, _code, _param);
+#else // !HAVE_LIBZ
+    abort();
+#endif // !HAVE_LIBZ
+  } else {
+    std::stringstream o;
+    return encodeAll(o, _code, _param);
+  }
+}
+
 } // namespace xmlrpc
 
 } // namespace aria2
diff --git a/src/XmlRpcResponse.h b/src/XmlRpcResponse.h
index bcbe46a2..384d9910 100644
--- a/src/XmlRpcResponse.h
+++ b/src/XmlRpcResponse.h
@@ -53,7 +53,7 @@ struct XmlRpcResponse {
 
   XmlRpcResponse(int code, const BDE& param):_code(code), _param(param) {}
 
-  std::string toXml() const;
+  std::string toXml(bool gzip = false) const;
 };
 
 } // namespace xmlrpc