implement metadata file xml loading+parsing

src/metadata/metadatafile.cpp

@@ -3,8 +3,11 @@
 #include "../common.h"
 #include "../animationsequence.h"
 #include "../geometry/extragroupinfo.h"
+#include <pugixml.hpp>
 #include <string>
 #include <vector>
+#include <stdio.h>
+#include <string.h>
 
 MetadataFile::MetadataFile()
 {
@@ -18,5 +21,94 @@ void MetadataFile::Release()
 
 BOOL MetadataFile::Load(const std::string &file)
 {
-	return FALSE;
+	if (access(file.c_str(), F_OK) == -1)
+		// file doesn't exist, but this isn't an error as metadata is optional
+		return TRUE;
+	
+	pugi::xml_document doc;
+	pugi::xml_parse_result parsed = doc.load_file(file.c_str());
+	
+	if (!parsed)
+	{
+		printf("Metadata XML parse error: %ld:%s\n", parsed.offset, parsed.description());
+		return FALSE;
+	}
+	
+	pugi::xml_node rootNode = doc.child("metadata");
+	if (rootNode.type() == pugi::node_null)
+		return FALSE;
+	
+	pugi::xml_node animationsNode = rootNode.child("animations");
+	for (pugi::xml_node animation = animationsNode.child("add"); animation; animation = animation.next_sibling("add"))
+	{
+		const char *name = animation.attribute("name").value();
+		uint32_t firstFrame = animation.attribute("first").as_uint();
+		uint32_t lastFrame = animation.attribute("last").as_uint();
+		
+		if (strlen(name) == 0)
+		{
+			printf("Metadata XML error: missing or empty animation name\n");
+			return FALSE;
+		}
+		if (firstFrame == lastFrame)
+		{
+			printf("Metadata XML error: zero-length animation\n");
+			return FALSE;
+		}
+		if (firstFrame > lastFrame)
+		{
+			printf("Metadata XML error: negative-length animation\n");
+			return FALSE;
+		}
+		
+		AnimationSequence newAnimation;
+		newAnimation.name = name;
+		newAnimation.start = firstFrame;
+		newAnimation.end = lastFrame;
+		
+		m_animations.push_back(newAnimation);
+	}
+	
+	pugi::xml_node groupsNode = rootNode.child("groups");
+	for (pugi::xml_node group = groupsNode.child("group"); group; group = group.next_sibling("group"))
+	{
+		bool hasName = !group.attribute("name").empty();
+		bool hasIndex = !group.attribute("index").empty();
+		bool hasTexture = !group.attribute("texture").empty();
+		const char *name = group.attribute("name").value();
+		uint32_t index = group.attribute("index").as_uint();
+		bool isAlpha = group.attribute("alpha").as_bool();
+		const char *texture = group.attribute("texture").value();
+		
+		if (!hasName && !hasIndex)
+		{
+			printf("Metadata XML error: group name or index required\n");
+			return FALSE;
+		}
+		if (hasName && strlen(name) == 0)
+		{
+			printf("Metadata XML error: empty group name\n");
+			return FALSE;
+		}
+		if (hasTexture && strlen(texture) == 0)
+		{
+			printf("Metadata XML error: empty texture name\n");
+			return FALSE;
+		}
+		
+		ExtraGroupInfo groupInfo;
+		groupInfo.specifiedByName = (BOOL)hasName;
+		if (hasName)
+			groupInfo.name = name;
+		else
+			groupInfo.index = index;
+		groupInfo.alphaBlend = isAlpha;
+		if (hasTexture)
+			groupInfo.textureFile = texture;
+		
+		m_groupInfo.push_back(groupInfo);
+	}
+	
+	m_isLoaded = TRUE;
+	return TRUE;
 }