Watch out! Skins!

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__