Watch out! Skins!

CMakeLists.txt

@@ -79,6 +79,8 @@ file(GLOB SERVER_SOURCES
     "src/network/command/CommandServer.cpp"
 
     "src/platform/CThread.cpp"
+    "src/platform/HttpClient.cpp"
+    "src/platform/PngLoader.cpp"
     "src/platform/time.cpp"
 
     "src/platform/input/Controller.cpp"

src/AppPlatform.h

@@ -71,6 +71,7 @@ public:
 
 	virtual void saveScreenshot(const std::string& filename, int glWidth, int glHeight) {}
 	virtual TextureData loadTexture(const std::string& filename_, bool textureFolder) { return TextureData(); }
+	virtual TextureData loadTextureFromMemory(const unsigned char* data, size_t size) { return TextureData(); }
 
     virtual void playSound(const std::string& fn, float volume, float pitch) {}
 

src/AppPlatform_glfw.h

@@ -3,6 +3,8 @@
 
 #include "AppPlatform.h"
 #include "platform/log.h"
+#include "platform/HttpClient.h"
+#include "platform/PngLoader.h"
 #include "client/renderer/gles.h"
 #include "world/level/storage/FolderMethods.h"
 #include <png.h>
@@ -11,6 +13,7 @@
 #include <sstream>
 #include <GLFW/glfw3.h>
 #include <ctime>
+#include "util/StringUtils.h"
 
 #ifdef _WIN32
 #include <windows.h>
@@ -55,10 +58,19 @@ public:
 
     TextureData loadTexture(const std::string& filename_, bool textureFolder)
 	{
+		// Support fetching PNG textures via HTTP/HTTPS (for skins, etc)
+		if (Util::startsWith(filename_, "http://") || Util::startsWith(filename_, "https://")) {
+			std::vector<unsigned char> body;
+			if (HttpClient::download(filename_, body) && !body.empty()) {
+				return loadTextureFromMemory(body.data(), body.size());
+			}
+			return TextureData();
+		}
+
 		TextureData out;
 
 		std::string filename = textureFolder? "data/images/" + filename_
-											: filename_;
+								: filename_;
 		std::ifstream source(filename.c_str(), std::ios::binary);
 
 		if (source) {
@@ -107,7 +119,11 @@ public:
 		}
     }
 
-    std::string getDateString(int s) {
+	TextureData loadTextureFromMemory(const unsigned char* data, size_t size) override {
+		return loadPngFromMemory(data, size);
+	}
+
+	virtual std::string getDateString(int s) override {
 		time_t tm = s;
 
 		char mbstr[100];

src/AppPlatform_win32.h

@@ -3,8 +3,11 @@
 
 #include "AppPlatform.h"
 #include "platform/log.h"
+#include "platform/HttpClient.h"
+#include "platform/PngLoader.h"
 #include "client/renderer/gles.h"
 #include "world/level/storage/FolderMethods.h"
+#include "util/StringUtils.h"
 #include <png.h>
 #include <cmath>
 #include <fstream>
@@ -50,10 +53,19 @@ public:
 
     TextureData loadTexture(const std::string& filename_, bool textureFolder)
 	{
+		// Support fetching PNG textures via HTTP/HTTPS (for skins, etc).
+		if (Util::startsWith(filename_, "http://") || Util::startsWith(filename_, "https://")) {
+			std::vector<unsigned char> body;
+			if (HttpClient::download(filename_, body) && !body.empty()) {
+				return loadTextureFromMemory(body.data(), body.size());
+			}
+			return TextureData();
+		}
+
 		TextureData out;
 
 		std::string filename = textureFolder? "data/images/" + filename_
-											: filename_;
+								: filename_;
 		std::ifstream source(filename.c_str(), std::ios::binary);
 
 		if (source) {
@@ -102,7 +114,9 @@ public:
 		}
     }
 
-    std::string getDateString(int s) {
+	TextureData loadTextureFromMemory(const unsigned char* data, size_t size) override {
+		return loadPngFromMemory(data, size);
+	}
  		time_t tm = s;
 
 		char mbstr[100];

src/client/model/HumanoidModel.cpp

@@ -4,8 +4,8 @@
 #include "../../world/entity/player/Player.h"
 #include "../../world/entity/player/Inventory.h"
 
-HumanoidModel::HumanoidModel( float g /*= 0*/, float yOffset /*= 0*/ )
-:	holdingLeftHand(false),
+HumanoidModel::HumanoidModel( float g /*= 0*/, float yOffset /*= 0*/, int texW /*= 64*/, int texH /*= 32*/ )
+:    holdingLeftHand(false),
 	holdingRightHand(false),
 	sneaking(false),
 	bowAndArrow(false),
@@ -18,6 +18,9 @@ HumanoidModel::HumanoidModel( float g /*= 0*/, float yOffset /*= 0*/ )
 	leg0(0, 16),
 	leg1(0, 16)
 {
+	texWidth = texW;
+	texHeight = texH;
+
 	head.setModel(this);
 	body.setModel(this);
 	arm0.setModel(this);

src/client/model/HumanoidModel.h

@@ -9,7 +9,7 @@ class ItemInstance;
 class HumanoidModel: public Model
 {
 public:
-    HumanoidModel(float g = 0, float yOffset = 0);
+HumanoidModel(float g = 0, float yOffset = 0, int texW = 64, int texH = 32);
 
 	void setupAnim(float time, float r, float bob, float yRot, float xRot, float scale);
 

src/client/model/geom/Cube.cpp

@@ -50,12 +50,12 @@ Cube::Cube(ModelPart* modelPart, int xTexOffs, int yTexOffs, float x0, float y0,
 	VertexPT* l2 = ++ptr;
 	VertexPT* l3 = ++ptr;
 
-	polygons[0] = PolygonQuad(l1, u1, u2, l2, xTexOffs + d + w, yTexOffs + d, xTexOffs + d + w + d, yTexOffs + d + h); // Right
-	polygons[1] = PolygonQuad(u0, l0, l3, u3, xTexOffs + 0, yTexOffs + d, xTexOffs + d, yTexOffs + d + h); // Left
-	polygons[2] = PolygonQuad(l1, l0, u0, u1, xTexOffs + d, yTexOffs + 0, xTexOffs + d + w, yTexOffs + d); // Up
-	polygons[3] = PolygonQuad(u2, u3, l3, l2, xTexOffs + d + w, yTexOffs + d, xTexOffs + d + w + w, yTexOffs); // Down
-	polygons[4] = PolygonQuad(u1, u0, u3, u2, xTexOffs + d, yTexOffs + d, xTexOffs + d + w, yTexOffs + d + h); // Front
-	polygons[5] = PolygonQuad(l0, l1, l2, l3, xTexOffs + d + w + d, yTexOffs + d, xTexOffs + d + w + d + w, yTexOffs + d + h); // Back
+	polygons[0] = PolygonQuad(l1, u1, u2, l2, xTexOffs + d + w, yTexOffs + d, xTexOffs + d + w + d, yTexOffs + d + h, modelPart->xTexSize, modelPart->yTexSize); // Right
+	polygons[1] = PolygonQuad(u0, l0, l3, u3, xTexOffs + 0, yTexOffs + d, xTexOffs + d, yTexOffs + d + h, modelPart->xTexSize, modelPart->yTexSize); // Left
+	polygons[2] = PolygonQuad(l1, l0, u0, u1, xTexOffs + d, yTexOffs + 0, xTexOffs + d + w, yTexOffs + d, modelPart->xTexSize, modelPart->yTexSize); // Up
+	polygons[3] = PolygonQuad(u2, u3, l3, l2, xTexOffs + d + w, yTexOffs + d, xTexOffs + d + w + w, yTexOffs, modelPart->xTexSize, modelPart->yTexSize); // Down
+	polygons[4] = PolygonQuad(u1, u0, u3, u2, xTexOffs + d, yTexOffs + d, xTexOffs + d + w, yTexOffs + d + h, modelPart->xTexSize, modelPart->yTexSize); // Front
+	polygons[5] = PolygonQuad(l0, l1, l2, l3, xTexOffs + d + w + d, yTexOffs + d, xTexOffs + d + w + d + w, yTexOffs + d + h, modelPart->xTexSize, modelPart->yTexSize); // Back
 
     if (modelPart->mirror) {
         for (int i = 0; i < 6; i++)

src/client/model/geom/Polygon.cpp

@@ -12,15 +12,15 @@ PolygonQuad::PolygonQuad(VertexPT* v0, VertexPT* v1, VertexPT* v2, VertexPT* v3)
 }
 
 PolygonQuad::PolygonQuad(	VertexPT* v0, VertexPT* v1, VertexPT* v2, VertexPT* v3,
-					int uu0, int vv0, int uu1, int vv1)
-:	_flipNormal(false)
+				int uu0, int vv0, int uu1, int vv1, float texW, float texH)
+: 	_flipNormal(false)
 {
-	const float us = -0.002f / 64.0f;//0.1f / 64.0f;
-	const float vs = -0.002f / 32.0f;//0.1f / 32.0f;
-	vertices[0] = v0->remap(uu1 / 64.0f - us, vv0 / 32.0f + vs);
-	vertices[1] = v1->remap(uu0 / 64.0f + us, vv0 / 32.0f + vs);
-	vertices[2] = v2->remap(uu0 / 64.0f + us, vv1 / 32.0f - vs);
-	vertices[3] = v3->remap(uu1 / 64.0f - us, vv1 / 32.0f - vs);
+	const float us = -0.002f / texW;
+	const float vs = -0.002f / texH;
+	vertices[0] = v0->remap(uu1 / texW - us, vv0 / texH + vs);
+	vertices[1] = v1->remap(uu0 / texW + us, vv0 / texH + vs);
+	vertices[2] = v2->remap(uu0 / texW + us, vv1 / texH - vs);
+	vertices[3] = v3->remap(uu1 / texW - us, vv1 / texH - vs);
 }
 
 PolygonQuad::PolygonQuad(	VertexPT* v0, VertexPT* v1, VertexPT* v2, VertexPT* v3,

src/client/model/geom/Polygon.h

@@ -11,7 +11,7 @@ class PolygonQuad
 public:
 	PolygonQuad() {}
     PolygonQuad(VertexPT*,VertexPT*,VertexPT*,VertexPT*);
-    PolygonQuad(VertexPT*,VertexPT*,VertexPT*,VertexPT*, int u0, int v0, int u1, int v1);
+    PolygonQuad(VertexPT*,VertexPT*,VertexPT*,VertexPT*, int u0, int v0, int u1, int v1, float texW = 64.0f, float texH = 32.0f);
     PolygonQuad(VertexPT*,VertexPT*,VertexPT*,VertexPT*, float u0, float v0, float u1, float v1);
 
 	void mirror();

src/client/player/LocalPlayer.cpp

@@ -18,6 +18,20 @@
 #include "../../network/packet/SendInventoryPacket.h"
 #include "../../network/packet/EntityEventPacket.h"
 #include "../../network/packet/PlayerActionPacket.h"
+#include <vector>
+#include <cctype>
+#include "../../platform/log.h"
+#include "../../platform/HttpClient.h"
+#include "../../platform/CThread.h"
+#include "../../util/StringUtils.h"
+
+#if defined(_WIN32)
+#include <direct.h>
+#else
+#include <sys/stat.h>
+#include <sys/types.h>
+#endif
+
 #ifndef STANDALONE_SERVER
 #include "../gui/Screen.h"
 #include "../gui/screens/FurnaceScreen.h"
@@ -32,6 +46,195 @@
 #include "../../world/item/ArmorItem.h"
 #include "../../network/packet/PlayerArmorEquipmentPacket.h"
 
+namespace {
+
+static bool isBase64(unsigned char c) {
+    return (std::isalnum(c) || (c == '+') || (c == '/'));
+}
+
+static std::string base64Decode(const std::string& encoded) {
+    static const std::string base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    std::string out;
+    int in_len = (int)encoded.size();
+    int i = 0;
+    int in_ = 0;
+    unsigned char char_array_4[4], char_array_3[3];
+
+    while (in_len-- && (encoded[in_] != '=') && isBase64(encoded[in_])) {
+        char_array_4[i++] = encoded[in_]; in_++;
+        if (i == 4) {
+            for (i = 0; i < 4; i++)
+                char_array_4[i] = (unsigned char)base64Chars.find(char_array_4[i]);
+
+            char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+            char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+            char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+            for (i = 0; i < 3; i++)
+                out += char_array_3[i];
+            i = 0;
+        }
+    }
+
+    if (i) {
+        for (int j = i; j < 4; j++)
+            char_array_4[j] = 0;
+        for (int j = 0; j < 4; j++)
+            char_array_4[j] = (unsigned char)base64Chars.find(char_array_4[j]);
+
+        char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+        char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+        char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+        for (int j = 0; (j < i - 1); j++)
+            out += char_array_3[j];
+    }
+    return out;
+}
+
+static std::string extractJsonString(const std::string& json, const std::string& key) {
+    std::string search = "\"" + key + "\"";
+    size_t pos = json.find(search);
+    if (pos == std::string::npos) return "";
+    pos = json.find(':', pos + search.size());
+    if (pos == std::string::npos) return "";
+    pos++;
+    while (pos < json.size() && std::isspace((unsigned char)json[pos])) pos++;
+    if (pos >= json.size() || json[pos] != '"') return "";
+    pos++;
+    size_t end = json.find('"', pos);
+    if (end == std::string::npos) return "";
+    return json.substr(pos, end - pos);
+}
+
+static std::string getSkinUrlForUsername(const std::string& username) {
+    if (username.empty()) {
+        LOGI("[Skin] username empty\n");
+        return "";
+    }
+
+    LOGI("[Skin] resolving UUID for user '%s'...\n", username.c_str());
+    std::vector<unsigned char> body;
+    std::string apiUrl = "http://api.mojang.com/users/profiles/minecraft/" + username;
+    if (!HttpClient::download(apiUrl, body)) {
+        LOGW("[Skin] failed to download UUID for %s\n", username.c_str());
+        return "";
+    }
+
+    std::string response(body.begin(), body.end());
+    std::string uuid = extractJsonString(response, "id");
+    if (uuid.empty()) {
+        LOGW("[Skin] no UUID found in Mojang response for %s\n", username.c_str());
+        return "";
+    }
+
+    LOGI("[Skin] UUID=%s for user %s\n", uuid.c_str(), username.c_str());
+
+    std::string profileUrl = "http://sessionserver.mojang.com/session/minecraft/profile/" + uuid;
+    if (!HttpClient::download(profileUrl, body)) {
+        LOGW("[Skin] failed to download profile for UUID %s\n", uuid.c_str());
+        return "";
+    }
+
+    response.assign(body.begin(), body.end());
+    std::string encoded = extractJsonString(response, "value");
+    if (encoded.empty()) {
+        LOGW("[Skin] no value field in profile response for UUID %s\n", uuid.c_str());
+        return "";
+    }
+
+    std::string decoded = base64Decode(encoded);
+    size_t skinPos = decoded.find("\"SKIN\"");
+    if (skinPos == std::string::npos) {
+        LOGW("[Skin] no SKIN entry in decoded profile for UUID %s\n", uuid.c_str());
+        return "";
+    }
+    size_t urlPos = decoded.find("\"url\"", skinPos);
+    if (urlPos == std::string::npos) {
+        LOGW("[Skin] no url field under SKIN for UUID %s\n", uuid.c_str());
+        return "";
+    }
+
+    // extract the URL value from the substring starting at urlPos
+    std::string urlFragment = decoded.substr(urlPos);
+    std::string skinUrl = extractJsonString(urlFragment, "url");
+    if (skinUrl.empty()) {
+        LOGW("[Skin] failed to parse skin URL for UUID %s\n", uuid.c_str());
+        return "";
+    }
+
+    LOGI("[Skin] skin URL for %s: %s\n", username.c_str(), skinUrl.c_str());
+    return skinUrl;
+}
+
+static bool ensureDirectoryExists(const std::string& path) {
+#if defined(_WIN32)
+    return _mkdir(path.c_str()) == 0 || errno == EEXIST;
+#else
+    struct stat st;
+    if (stat(path.c_str(), &st) == 0 && S_ISDIR(st.st_mode))
+        return true;
+    return mkdir(path.c_str(), 0755) == 0 || errno == EEXIST;
+#endif
+}
+
+static bool fileExists(const std::string& path) {
+    struct stat st;
+    if (stat(path.c_str(), &st) != 0)
+        return false;
+
+#if defined(_WIN32)
+    return (st.st_mode & _S_IFREG) != 0;
+#else
+    return S_ISREG(st.st_mode);
+#endif
+}
+
+static void* fetchSkinForPlayer(void* param) {
+    LocalPlayer* player = (LocalPlayer*)param;
+    if (!player) return NULL;
+
+    LOGI("[Skin] starting skin download for %s\n", player->name.c_str());
+
+    const std::string cacheDir = "data/images/skins";
+    if (!ensureDirectoryExists(cacheDir)) {
+        LOGW("[Skin] failed to create cache directory %s\n", cacheDir.c_str());
+    }
+
+    std::string cacheFile = cacheDir + "/" + player->name + ".png";
+    if (fileExists(cacheFile)) {
+        LOGI("[Skin] using cached skin for %s\n", player->name.c_str());
+        player->setTextureName("skins/" + player->name + ".png");
+        return NULL;
+    }
+
+    std::string skinUrl = getSkinUrlForUsername(player->name);
+    if (skinUrl.empty()) {
+        LOGW("[Skin] skin URL lookup failed for %s\n", player->name.c_str());
+        return NULL;
+    }
+
+    LOGI("[Skin] downloading skin from %s\n", skinUrl.c_str());
+    std::vector<unsigned char> skinData;
+    if (!HttpClient::download(skinUrl, skinData) || skinData.empty()) {
+        LOGW("[Skin] download failed for %s\n", skinUrl.c_str());
+        return NULL;
+    }
+
+    // Save to cache
+    FILE* fp = fopen(cacheFile.c_str(), "wb");
+    if (fp) {
+        fwrite(skinData.data(), 1, skinData.size(), fp);
+        fclose(fp);
+        LOGI("[Skin] cached skin to %s\n", cacheFile.c_str());
+    } else {
+        LOGW("[Skin] failed to write skin cache %s\n", cacheFile.c_str());
+    }
+
+    player->setTextureName("skins/" + player->name + ".png");
+    return NULL;
+}
+
 //@note: doesn't work completely, since it doesn't care about stairs rotation
 static bool isJumpable(int tileId) {
 	return tileId != Tile::fence->id
@@ -43,6 +246,8 @@ static bool isJumpable(int tileId) {
 		&& (Tile::tiles[tileId] != NULL && Tile::tiles[tileId]->getRenderShape() != Tile::SHAPE_STAIRS);
 }
 
+} // anonymous namespace
+
 LocalPlayer::LocalPlayer(Minecraft* minecraft, Level* level, User* user, int dimension, bool isCreative)
 :	Player(level, isCreative),
 	minecraft(minecraft),
@@ -58,10 +263,10 @@ LocalPlayer::LocalPlayer(Minecraft* minecraft, Level* level, User* user, int dim
 	this->dimension = dimension;
 	_init();
 
-	if (user != NULL) {
-		if (user->name.length() > 0)
-			//customTextureUrl = "http://s3.amazonaws.com/MinecraftSkins/" + user.name + ".png";
-			this->name = user->name;
+	if (user != NULL && !user->name.empty()) {
+		this->name = user->name;
+		// Fetch user skin from Mojang servers in the background (avoids blocking the main thread)
+		new CThread(fetchSkinForPlayer, this);
 	}
 }
 

src/client/renderer/TextureData.h

@@ -16,7 +16,7 @@ typedef struct TextureData {
 	TextureData()
 	:	w(0),
 		h(0),
-		data(NULL),
+		data(nullptr),
         numBytes(0),
 		transparent(true),
 		memoryHandledExternally(false),

src/client/renderer/Textures.cpp

@@ -5,6 +5,7 @@
 #include "../Options.h"
 #include "../../platform/time.h"
 #include "../../AppPlatform.h"
+#include "../../util/StringUtils.h"
 
 /*static*/ int  Textures::textureChanges = 0;
 /*static*/ bool Textures::MIPMAP = false;
@@ -64,7 +65,8 @@ TextureId Textures::loadTexture( const std::string& resourceName, bool inTexture
 	if (it != idMap.end())
 		return it->second;
 
-	TextureData texdata = platform->loadTexture(resourceName, inTextureFolder);
+	bool isUrl = Util::startsWith(resourceName, "http://") || Util::startsWith(resourceName, "https://");
+	TextureData texdata = platform->loadTexture(resourceName, isUrl ? false : inTextureFolder);
 	if (texdata.data)
 		return assignTexture(resourceName, texdata);
     else if (texdata.identifier != InvalidId) {

src/client/renderer/entity/EntityRenderDispatcher.cpp

@@ -51,7 +51,7 @@ EntityRenderDispatcher::EntityRenderDispatcher()
 	assign(	ER_SPIDER_RENDERER,		new SpiderRenderer());
 	assign(	ER_TNT_RENDERER,		new TntRenderer());
 	assign(	ER_ARROW_RENDERER,		new ArrowRenderer());
-	assign( ER_PLAYER_RENDERER,		new PlayerRenderer(new HumanoidModel(), 0));
+	assign( ER_PLAYER_RENDERER,		new PlayerRenderer(new HumanoidModel(0, 0, 64, 64), 0));
 	assign( ER_THROWNEGG_RENDERER,  new ItemSpriteRenderer(Item::egg->getIcon(0)));
 	assign( ER_SNOWBALL_RENDERER,   new ItemSpriteRenderer(Item::snowBall->getIcon(0)));
 	assign( ER_PAINTING_RENDERER,   new PaintingRenderer());

src/client/renderer/entity/PlayerRenderer.cpp

@@ -14,8 +14,8 @@ static const std::string armorFilenames[10] = {
 
 PlayerRenderer::PlayerRenderer( HumanoidModel* humanoidModel, float shadow )
 :	super(humanoidModel, shadow),
-	armorParts1(new HumanoidModel(1.0f)),
-	armorParts2(new HumanoidModel(0.5f))
+	armorParts1(new HumanoidModel(1.0f, 0, 64, 64)),
+	armorParts2(new HumanoidModel(0.5f, 0, 64, 64))
 {
 }
 

src/platform/HttpClient.cpp

@@ -0,0 +1,335 @@
+#include "HttpClient.h"
+#include "log.h"
+
+#include <algorithm>
+#include <cctype>
+#include <cstring>
+#include <string>
+#include <vector>
+
+#if defined(_WIN32)
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <winhttp.h>
+#pragma comment(lib, "ws2_32.lib")
+#pragma comment(lib, "winhttp.lib")
+#else
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+namespace {
+
+bool startsWith(const std::string& s, const std::string& prefix) {
+    return s.size() >= prefix.size() && std::equal(prefix.begin(), prefix.end(), s.begin());
+}
+
+bool parseUrl(const std::string& url, std::string& scheme, std::string& host, int& port, std::string& path);
+
+#if defined(_WIN32)
+
+bool downloadHttpsWinHttp(const std::string& url, std::vector<unsigned char>& outBody) {
+    outBody.clear();
+
+    std::string scheme, host, path;
+    int port = 0;
+    if (!parseUrl(url, scheme, host, port, path))
+        return false;
+
+    // WinHTTP expects the path to include the leading '/'.
+    HINTERNET hSession = WinHttpOpen(L"MinecraftPE/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
+    if (!hSession)
+        return false;
+
+    HINTERNET hConnect = WinHttpConnect(hSession, std::wstring(host.begin(), host.end()).c_str(), port, 0);
+    if (!hConnect) {
+        WinHttpCloseHandle(hSession);
+        return false;
+    }
+
+    HINTERNET hRequest = WinHttpOpenRequest(
+        hConnect,
+        L"GET",
+        std::wstring(path.begin(), path.end()).c_str(),
+        NULL,
+        WINHTTP_NO_REFERER,
+        WINHTTP_DEFAULT_ACCEPT_TYPES,
+        WINHTTP_FLAG_SECURE
+    );
+
+    if (!hRequest) {
+        WinHttpCloseHandle(hConnect);
+        WinHttpCloseHandle(hSession);
+        return false;
+    }
+
+    DWORD redirectPolicy = WINHTTP_OPTION_REDIRECT_POLICY_ALWAYS;
+    WinHttpSetOption(hRequest, WINHTTP_OPTION_REDIRECT_POLICY, &redirectPolicy, sizeof(redirectPolicy));
+
+    BOOL result = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0);
+    if (!result) {
+        WinHttpCloseHandle(hRequest);
+        WinHttpCloseHandle(hConnect);
+        WinHttpCloseHandle(hSession);
+        return false;
+    }
+
+    result = WinHttpReceiveResponse(hRequest, NULL);
+    if (!result) {
+        WinHttpCloseHandle(hRequest);
+        WinHttpCloseHandle(hConnect);
+        WinHttpCloseHandle(hSession);
+        return false;
+    }
+
+    DWORD bytesAvailable = 0;
+    while (WinHttpQueryDataAvailable(hRequest, &bytesAvailable) && bytesAvailable > 0) {
+        std::vector<unsigned char> buffer(bytesAvailable);
+        DWORD bytesRead = 0;
+        if (!WinHttpReadData(hRequest, buffer.data(), bytesAvailable, &bytesRead) || bytesRead == 0)
+            break;
+        outBody.insert(outBody.end(), buffer.begin(), buffer.begin() + bytesRead);
+    }
+
+    WinHttpCloseHandle(hRequest);
+    WinHttpCloseHandle(hConnect);
+    WinHttpCloseHandle(hSession);
+
+    return !outBody.empty();
+}
+
+#endif
+
+std::string toLower(const std::string& s) {
+    std::string out = s;
+    std::transform(out.begin(), out.end(), out.begin(), ::tolower);
+    return out;
+}
+
+bool parseUrl(const std::string& url, std::string& scheme, std::string& host, int& port, std::string& path) {
+    scheme.clear();
+    host.clear();
+    path.clear();
+    port = 0;
+
+    // Very simple URL parser.
+    // url format: scheme://host[:port]/path
+    auto pos = url.find("://");
+    if (pos == std::string::npos) return false;
+    scheme = toLower(url.substr(0, pos));
+    size_t start = pos + 3;
+
+    size_t slash = url.find('/', start);
+    std::string hostPort = (slash == std::string::npos) ? url.substr(start) : url.substr(start, slash - start);
+    path = (slash == std::string::npos) ? "/" : url.substr(slash);
+
+    size_t colon = hostPort.find(':');
+    if (colon != std::string::npos) {
+        host = hostPort.substr(0, colon);
+        port = atoi(hostPort.c_str() + colon + 1);
+    } else {
+        host = hostPort;
+    }
+
+    if (scheme == "http") {
+        if (port == 0) port = 80;
+    } else if (scheme == "https") {
+        if (port == 0) port = 443;
+    }
+
+    return !host.empty() && !scheme.empty();
+}
+
+bool readAll(int sockfd, std::vector<unsigned char>& out) {
+    const int BUF_SIZE = 4096;
+    unsigned char buffer[BUF_SIZE];
+
+    while (true) {
+        int received = recv(sockfd, (char*)buffer, BUF_SIZE, 0);
+        if (received <= 0)
+            break;
+        out.insert(out.end(), buffer, buffer + received);
+    }
+    return true;
+}
+
+bool resolveAndConnect(const std::string& host, int port, int& outSock) {
+#if defined(_WIN32)
+    static bool initialized = false;
+    if (!initialized) {
+        WSADATA wsaData;
+        WSAStartup(MAKEWORD(2, 2), &wsaData);
+        initialized = true;
+    }
+#endif
+
+    struct addrinfo hints;
+    struct addrinfo* result = NULL;
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+
+    const std::string portStr = std::to_string(port);
+    if (getaddrinfo(host.c_str(), portStr.c_str(), &hints, &result) != 0)
+        return false;
+
+    int sock = -1;
+    for (struct addrinfo* rp = result; rp != NULL; rp = rp->ai_next) {
+        sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+        if (sock < 0) continue;
+        if (connect(sock, rp->ai_addr, (int)rp->ai_addrlen) == 0)
+            break; // success
+
+#if defined(_WIN32)
+        closesocket(sock);
+#else
+        close(sock);
+#endif
+        sock = -1;
+    }
+
+    freeaddrinfo(result);
+
+    if (sock < 0)
+        return false;
+
+    outSock = sock;
+    return true;
+}
+
+std::string getHeaderValue(const std::string& headers, const std::string& key) {
+    std::string lower = toLower(headers);
+    std::string lowerKey = toLower(key);
+    size_t pos = lower.find(lowerKey);
+    if (pos == std::string::npos) return "";
+    size_t colon = lower.find(':', pos + lowerKey.size());
+    if (colon == std::string::npos) return "";
+    size_t start = colon + 1;
+    while (start < lower.size() && (lower[start] == ' ' || lower[start] == '\t')) start++;
+    size_t end = lower.find('\r', start);
+    if (end == std::string::npos) end = lower.find('\n', start);
+    if (end == std::string::npos) end = lower.size();
+    return headers.substr(start, end - start);
+}
+
+bool extractStatusCode(const std::string& headers, int& outStatus) {
+    size_t pos = headers.find(" ");
+    if (pos == std::string::npos) return false;
+    size_t pos2 = headers.find(" ", pos + 1);
+    if (pos2 == std::string::npos) return false;
+    std::string code = headers.substr(pos + 1, pos2 - pos - 1);
+    outStatus = atoi(code.c_str());
+    return true;
+}
+
+} // anonymous namespace
+
+namespace HttpClient {
+
+bool download(const std::string& url, std::vector<unsigned char>& outBody) {
+    outBody.clear();
+
+    std::string currentUrl = url;
+    for (int redirect = 0; redirect < 3; ++redirect) {
+        std::string scheme, host, path;
+        int port = 0;
+        if (!parseUrl(currentUrl, scheme, host, port, path)) {
+            LOGW("[HttpClient] parseUrl failed for '%s'\n", currentUrl.c_str());
+            return false;
+        }
+
+        if (scheme == "https") {
+#if defined(_WIN32)
+            LOGI("[HttpClient] using WinHTTP for HTTPS URL %s\n", currentUrl.c_str());
+            return downloadHttpsWinHttp(currentUrl, outBody);
+#else
+            LOGW("[HttpClient] HTTPS not supported on this platform: %s\n", currentUrl.c_str());
+            return false;
+#endif
+        }
+
+        if (scheme != "http") {
+            LOGW("[HttpClient] unsupported scheme '%s' for URL '%s'\n", scheme.c_str(), currentUrl.c_str());
+            return false;
+        }
+
+        int sock = -1;
+        if (!resolveAndConnect(host, port, sock)) {
+            LOGW("[HttpClient] resolve/connect failed for %s:%d\n", host.c_str(), port);
+            return false;
+        }
+
+        std::string request = "GET " + path + " HTTP/1.1\r\n";
+        request += "Host: " + host + "\r\n";
+        request += "User-Agent: MinecraftPE\r\n";
+        request += "Connection: close\r\n";
+        request += "\r\n";
+
+        send(sock, request.c_str(), (int)request.size(), 0);
+
+        std::vector<unsigned char> raw;
+        readAll(sock, raw);
+
+#if defined(_WIN32)
+        closesocket(sock);
+#else
+        close(sock);
+#endif
+
+        if (raw.empty()) {
+            LOGW("[HttpClient] no response data from %s\n", currentUrl.c_str());
+            return false;
+        }
+
+        // split headers and body
+        const std::string delim = "\r\n\r\n";
+        auto it = std::search(raw.begin(), raw.end(), delim.begin(), delim.end());
+        if (it == raw.end())
+            return false;
+
+        size_t headerLen = it - raw.begin();
+        std::string headers(reinterpret_cast<const char*>(raw.data()), headerLen);
+        size_t bodyStart = headerLen + delim.size();
+
+        int status = 0;
+        if (!extractStatusCode(headers, status))
+            return false;
+
+        if (status == 301 || status == 302 || status == 307 || status == 308) {
+            std::string location = getHeaderValue(headers, "Location");
+            if (location.empty()) {
+                LOGW("[HttpClient] redirect without Location header for %s\n", currentUrl.c_str());
+                return false;
+            }
+            LOGI("[HttpClient] redirect %s -> %s\n", currentUrl.c_str(), location.c_str());
+            currentUrl = location;
+            continue;
+        }
+
+        if (status != 200) {
+            std::string bodySnippet;
+            if (!outBody.empty()) {
+                size_t len = std::min(outBody.size(), (size_t)1024);
+                bodySnippet.assign(outBody.begin(), outBody.begin() + len);
+            }
+            LOGW("[HttpClient] HTTP status %d for %s\n", status, currentUrl.c_str());
+            LOGW("[HttpClient] Headers:\n%s\n", headers.c_str());
+            LOGW("[HttpClient] Body (up to 1024 bytes):\n%s\n", bodySnippet.c_str());
+            return false;
+        }
+
+        outBody.assign(raw.begin() + bodyStart, raw.end());
+        return true;
+    }
+
+    return false;
+}
+
+} // namespace HttpClient

src/platform/HttpClient.h

@@ -0,0 +1,16 @@
+#ifndef HTTPCLIENT_H__
+#define HTTPCLIENT_H__
+
+#include <string>
+#include <vector>
+
+namespace HttpClient {
+
+/// Download the given URL into "outBody".
+/// Returns true if the download completed successfully (HTTP 200) and the body is in outBody.
+/// This function supports plain HTTP only (no TLS). It will follow up to 3 redirects.
+bool download(const std::string& url, std::vector<unsigned char>& outBody);
+
+} // namespace HttpClient
+
+#endif /* HTTPCLIENT_H__ */

src/platform/PngLoader.cpp

@@ -0,0 +1,94 @@
+#include "PngLoader.h"
+
+#include <png.h>
+#include <cstring>
+
+struct MemoryReader {
+    const unsigned char* data;
+    size_t size;
+    size_t pos;
+};
+
+static void pngMemoryRead(png_structp pngPtr, png_bytep outBytes, png_size_t byteCountToRead) {
+    MemoryReader* reader = (MemoryReader*)png_get_io_ptr(pngPtr);
+    if (!reader)
+        return;
+
+    if (reader->pos + byteCountToRead > reader->size) {
+        png_error(pngPtr, "Read past end of buffer");
+        return;
+    }
+
+    memcpy(outBytes, reader->data + reader->pos, byteCountToRead);
+    reader->pos += byteCountToRead;
+}
+
+TextureData loadPngFromMemory(const unsigned char* data, size_t size) {
+    TextureData out;
+    if (!data || size == 0) return out;
+
+    png_structp pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if (!pngPtr) return out;
+
+    png_infop infoPtr = png_create_info_struct(pngPtr);
+    if (!infoPtr) {
+        png_destroy_read_struct(&pngPtr, NULL, NULL);
+        return out;
+    }
+
+    if (setjmp(png_jmpbuf(pngPtr))) {
+        png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
+        return out;
+    }
+
+    MemoryReader reader;
+    reader.data = data;
+    reader.size = size;
+    reader.pos = 0;
+
+    png_set_read_fn(pngPtr, &reader, pngMemoryRead);
+    png_read_info(pngPtr, infoPtr);
+
+    // Convert any color type to 8-bit RGBA
+    if (png_get_color_type(pngPtr, infoPtr) == PNG_COLOR_TYPE_PALETTE)
+        png_set_palette_to_rgb(pngPtr);
+    if (png_get_color_type(pngPtr, infoPtr) == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(pngPtr, infoPtr) < 8)
+        png_set_expand_gray_1_2_4_to_8(pngPtr);
+    if (png_get_valid(pngPtr, infoPtr, PNG_INFO_tRNS))
+        png_set_tRNS_to_alpha(pngPtr);
+    if (png_get_bit_depth(pngPtr, infoPtr) == 16)
+        png_set_strip_16(pngPtr);
+
+    // Ensure we always have RGBA (4 bytes per pixel)
+    // Only add alpha if the image lacks it (e.g., RGB skin files).
+    png_set_gray_to_rgb(pngPtr);
+
+    // Handle interlaced PNGs properly
+    int number_passes = png_set_interlace_handling(pngPtr);
+
+    png_read_update_info(pngPtr, infoPtr);
+
+    int colorType = png_get_color_type(pngPtr, infoPtr);
+    if (colorType == PNG_COLOR_TYPE_RGB) {
+        png_set_filler(pngPtr, 0xFF, PNG_FILLER_AFTER);
+    }
+
+    out.w = png_get_image_width(pngPtr, infoPtr);
+    out.h = png_get_image_height(pngPtr, infoPtr);
+
+    png_bytep* rowPtrs = new png_bytep[out.h];
+    out.data = new unsigned char[4 * out.w * out.h];
+    out.memoryHandledExternally = false;
+
+    int rowStrideBytes = 4 * out.w;
+    for (int i = 0; i < out.h; i++) {
+        rowPtrs[i] = (png_bytep)&out.data[i*rowStrideBytes];
+    }
+
+    png_read_image(pngPtr, rowPtrs);
+
+    png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
+    delete[] rowPtrs;
+
+    return out;
+}

src/platform/PngLoader.h

@@ -0,0 +1,12 @@
+#ifndef PNGLOADER_H__
+#define PNGLOADER_H__
+
+#include "../client/renderer/TextureData.h"
+
+#include <cstddef>
+
+/// Decode a PNG (from memory) into a TextureData.
+/// Returns an empty TextureData on failure.
+TextureData loadPngFromMemory(const unsigned char* data, size_t size);
+
+#endif // PNGLOADER_H__

src/world/entity/Mob.cpp

@@ -110,6 +110,11 @@ std::string Mob::getTexture()
 	return textureName;
 }
 
+void Mob::setTextureName(const std::string& name)
+{
+	textureName = name;
+}
+
 bool Mob::isPickable()
 {
 	return !removed;

src/world/entity/Mob.h

@@ -42,6 +42,7 @@ public:
 
 	virtual void spawnAnim();
     virtual std::string getTexture();
+    virtual void setTextureName(const std::string& name);
 
 	virtual bool isAlive();
     virtual bool isPickable();