start an xml format

Makefile

@@ -12,7 +12,8 @@ SOURCE=\
 	metadata_dump.cc \
 	metadata_disk_structures.cc \
 	space_map_disk.cc \
-	transaction_manager.cc
+	transaction_manager.cc \
+	xml_format.cc
 
 OBJECTS=$(subst .cc,.o,$(SOURCE))
 TOP_DIR:=$(PWD)

metadata_dump.cc

@@ -1,6 +1,7 @@
 #include "metadata.h"
 
 #include "human_readable_format.h"
+#include "xml_format.h"
 
 using namespace persistent_data;
 using namespace thin_provisioning;
@@ -125,7 +126,7 @@ namespace {
 void
 metadata::dump()
 {
-	emitter::ptr e = create_human_readable_emitter(cout);
+	emitter::ptr e = create_xml_emitter(cout);
 
 	details_extractor::ptr de(new details_extractor);
 

xml_format.cc

@@ -0,0 +1,110 @@
+#include "xml_format.h"
+
+
+#include <iostream>
+
+using namespace std;
+using namespace thin_provisioning;
+
+//----------------------------------------------------------------
+
+namespace {
+	class xml_emitter : public emitter {
+	public:
+		xml_emitter(ostream &out)
+			: out_(out),
+			  indent_(0) {
+		}
+
+		void begin_superblock(string const &uuid,
+				      uint64_t time,
+				      uint64_t trans_id,
+				      uint32_t data_block_size) {
+			out_ << "begin superblock: " << uuid
+			     << ", " << time
+			     << ", " << trans_id
+			     << ", " << data_block_size
+			     << endl;
+		}
+
+		void end_superblock() {
+			out_ << "end superblock" << endl;
+		}
+
+		void begin_device(uint32_t dev_id,
+				  uint64_t mapped_blocks,
+				  uint64_t trans_id,
+				  uint64_t creation_time,
+				  uint64_t snap_time) {
+			indent();
+			out_ << "<device dev_id =\"" << dev_id << "\""
+			     << " mapped_blocks=\"" << mapped_blocks << "\""
+			     << " transaction=\"" << trans_id << "\""
+			     << " creation_time=\"" << creation_time << "\""
+			     << " snap_time=\"" << snap_time << "\">" << endl;
+			inc();
+		}
+
+		void end_device() {
+			dec();
+			out_ << "</device>" << endl;
+		}
+
+		void begin_named_mapping(string const &name) {
+			out_ << "begin named mapping"
+			     << endl;
+		}
+
+		void end_named_mapping() {
+			out_ << "end named mapping"
+			     << endl;
+		}
+
+		void identifier(string const &name) {
+			out_ << "identifier: " << name << endl;
+		}
+
+		void range_map(uint64_t origin_begin, uint64_t data_begin, uint64_t len) {
+			indent();
+
+			out_ << "<range_mapping origin_begin=\"" << origin_begin << "\""
+			     << " data_begin=\"" << data_begin << "\""
+			     << " length=\"" << len << "\"/>"
+			     << endl;
+		}
+
+		void single_map(uint64_t origin_block, uint64_t data_block) {
+			indent();
+
+			out_ << "<single_mapping origin_block=\"" << origin_block << "\""
+			     << " data_block=\"" << data_block << "\"/>" << endl;
+		}
+
+	private:
+		void indent() {
+			for (unsigned i = 0; i < indent_ * 2; i++)
+				out_ << ' ';
+		}
+
+		void inc() {
+			indent_++;
+		}
+
+		void dec() {
+			indent_--;
+		}
+
+		ostream &out_;
+		unsigned indent_;
+	};
+}
+
+//----------------------------------------------------------------
+
+thin_provisioning::emitter::ptr
+thin_provisioning::create_xml_emitter(ostream &out)
+{
+	return emitter::ptr(new xml_emitter(out));
+}
+
+//----------------------------------------------------------------

xml_format.h

@@ -0,0 +1,16 @@
+#ifndef XML_FORMAT_H
+#define XML_FORMAT_H
+
+#include "emitter.h"
+
+#include <iosfwd>
+
+//----------------------------------------------------------------
+
+namespace thin_provisioning {
+	emitter::ptr create_xml_emitter(std::ostream &out);
+}
+
+//----------------------------------------------------------------
+
+#endif