fix: handle UTF-8 file paths on Windows (#2145)

examples/server/routes_index.cpp

@@ -1,5 +1,6 @@
 #include "routes.h"
 
+#include <filesystem>
 #include <fstream>
 #include <iterator>
 
@@ -7,7 +8,7 @@ void register_index_endpoints(httplib::Server& svr, const SDSvrParams& svr_param
     const std::string serve_html_path = svr_params.serve_html_path;
     svr.Get("/", [serve_html_path, index_html](const httplib::Request&, httplib::Response& res) {
         if (!serve_html_path.empty()) {
-            std::ifstream file(serve_html_path);
+            std::ifstream file(std::filesystem::u8path(serve_html_path));
             if (file) {
                 std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
                 res.set_content(content, "text/html");

examples/server/routes_sdapi.cpp

@@ -28,10 +28,10 @@ static std::string extract_and_remove_sd_cpp_extra_args(std::string& text) {
 static fs::path resolve_display_model_path(const ServerRuntime& runtime) {
     const auto& ctx = *runtime.ctx_params;
     if (!ctx.model_path.empty()) {
-        return fs::path(ctx.model_path);
+        return fs::u8path(ctx.model_path);
     }
     if (!ctx.diffusion_model_path.empty()) {
-        return fs::path(ctx.diffusion_model_path);
+        return fs::u8path(ctx.diffusion_model_path);
     }
     return {};
 }
@@ -583,9 +583,9 @@ void register_sdapi_endpoints(httplib::Server& svr, ServerRuntime& rt) {
     svr.Get("/sdapi/v1/sd-models", [runtime](const httplib::Request&, httplib::Response& res) {
         fs::path model_path = resolve_display_model_path(*runtime);
         json entry;
-        entry["title"]      = model_path.stem();
-        entry["model_name"] = model_path.stem();
-        entry["filename"]   = model_path.filename();
+        entry["title"]      = model_path.stem().u8string();
+        entry["model_name"] = model_path.stem().u8string();
+        entry["filename"]   = model_path.filename().u8string();
         entry["hash"]       = "8888888888";
         entry["sha256"]     = "8888888888888888888888888888888888888888888888888888888888888888";
         entry["config"]     = nullptr;
@@ -598,7 +598,7 @@ void register_sdapi_endpoints(httplib::Server& svr, ServerRuntime& rt) {
         fs::path model_path = resolve_display_model_path(*runtime);
         json r;
         r["samples_format"]      = "png";
-        r["sd_model_checkpoint"] = model_path.stem();
+        r["sd_model_checkpoint"] = model_path.stem().u8string();
         res.set_content(r.dump(), "application/json");
     });
 

examples/server/routes_sdcpp.cpp

@@ -90,10 +90,10 @@ static json make_vae_tiling_json(const sd_tiling_params_t& params) {
 static fs::path resolve_display_model_path(const ServerRuntime& runtime) {
     const auto& ctx = *runtime.ctx_params;
     if (!ctx.model_path.empty()) {
-        return fs::path(ctx.model_path);
+        return fs::u8path(ctx.model_path);
     }
     if (!ctx.diffusion_model_path.empty()) {
-        return fs::path(ctx.diffusion_model_path);
+        return fs::u8path(ctx.diffusion_model_path);
     }
     return {};
 }

examples/server/runtime.cpp

@@ -22,7 +22,7 @@ static std::string lower_ascii(std::string value) {
 }
 
 static bool is_supported_model_ext(const fs::path& p) {
-    auto ext = lower_ascii(p.extension().string());
+    auto ext = lower_ascii(p.extension().u8string());
     return ext == ".gguf" || ext == ".pt" || ext == ".pth" || ext == ".safetensors";
 }
 
@@ -226,7 +226,7 @@ bool SDSvrParams::validate() {
         return false;
     }
 
-    if (!serve_html_path.empty() && !fs::exists(serve_html_path)) {
+    if (!serve_html_path.empty() && !fs::exists(fs::u8path(serve_html_path))) {
         LOG_ERROR("error: serve_html_path file does not exist: %s", serve_html_path.c_str());
         return false;
     }
@@ -260,7 +260,7 @@ void refresh_lora_cache(ServerRuntime& rt) {
         return;
     }
 
-    fs::path lora_dir = rt.ctx_params->lora_model_dir;
+    fs::path lora_dir = fs::u8path(rt.ctx_params->lora_model_dir);
     std::error_code ec;
     if (fs::exists(lora_dir, ec) && !ec && fs::is_directory(lora_dir, ec) && !ec) {
         try {
@@ -293,13 +293,13 @@ void refresh_lora_cache(ServerRuntime& rt) {
                 it.increment(ec);
             }
         } catch (const std::exception& e) {
-            LOG_WARN("error while scanning lora directory '%s': %s", lora_dir.string().c_str(), e.what());
+            LOG_WARN("error while scanning lora directory '%s': %s", lora_dir.u8string().c_str(), e.what());
             return;
         }
     }
 
     if (ec) {
-        LOG_WARN("error while scanning lora directory '%s': %s", lora_dir.string().c_str(), ec.message().c_str());
+        LOG_WARN("error while scanning lora directory '%s': %s", lora_dir.u8string().c_str(), ec.message().c_str());
         return;
     }
 
@@ -328,7 +328,7 @@ void refresh_upscaler_cache(ServerRuntime& rt) {
         previous_cache = *rt.upscaler_cache;
     }
 
-    fs::path upscaler_dir = rt.ctx_params->hires_upscalers_dir;
+    fs::path upscaler_dir = fs::u8path(rt.ctx_params->hires_upscalers_dir);
     std::error_code ec;
     if (fs::exists(upscaler_dir, ec) && !ec && fs::is_directory(upscaler_dir, ec) && !ec) {
         try {
@@ -384,13 +384,13 @@ void refresh_upscaler_cache(ServerRuntime& rt) {
                 it.increment(ec);
             }
         } catch (const std::exception& e) {
-            LOG_WARN("error while scanning upscalers directory '%s': %s", upscaler_dir.string().c_str(), e.what());
+            LOG_WARN("error while scanning upscalers directory '%s': %s", upscaler_dir.u8string().c_str(), e.what());
             return;
         }
     }
 
     if (ec) {
-        LOG_WARN("error while scanning upscalers directory '%s': %s", upscaler_dir.string().c_str(), ec.message().c_str());
+        LOG_WARN("error while scanning upscalers directory '%s': %s", upscaler_dir.u8string().c_str(), ec.message().c_str());
         return;
     }