From d9926edb2f0d0147d1211a9d3203b3982f66ac72 Mon Sep 17 00:00:00 2001
From: Hermet Park <hermetpark@gmail.com>
Date: Sat, 16 Mar 2024 15:41:23 +0900
Subject: [PATCH] ttf: enhance UWP portability with alternative file loading

Enhances the portability of the TTF loader on UWP platforms
by implementing an alternative file loading mechanism.

This is designed to support environments where the file mapping
feature is not available, ensuring wider compatibility and reliability
in file handling.

Issue: https://github.com/thorvg/thorvg/issues/1912
---
 src/loaders/ttf/tvgTtfLoader.cpp | 46 +++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/src/loaders/ttf/tvgTtfLoader.cpp b/src/loaders/ttf/tvgTtfLoader.cpp
index b0e028e5..24a44786 100644
--- a/src/loaders/ttf/tvgTtfLoader.cpp
+++ b/src/loaders/ttf/tvgTtfLoader.cpp
@@ -23,9 +23,9 @@
 
 #include "tvgTtfLoader.h"
 
-#ifdef _WIN32
+#if defined(_WIN32)
     #include <windows.h>
-#else
+#elif defined(__linux__)
     #include <fcntl.h>
     #include <unistd.h>
     #include <sys/mman.h>
@@ -36,7 +36,7 @@
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
-#ifdef _WIN32
+#if defined(_WIN32)
 
 static bool _map(TtfLoader* loader, const string& path)
 {
@@ -83,7 +83,7 @@ static void _unmap(TtfLoader* loader)
 	}
 }
 
-#else
+#elif defined(__linux__)
 
 static bool _map(TtfLoader* loader, const string& path)
 {
@@ -115,6 +115,44 @@ static void _unmap(TtfLoader* loader)
     reader.data = (uint8_t*)-1;
     reader.size = 0;
 }
+#else
+static bool _map(TtfLoader* loader, const string& path)
+{
+    auto& reader = loader->reader;
+
+    auto f = fopen(path.c_str(), "rb");
+    if (!f) return false;
+
+    fseek(f, 0, SEEK_END);
+
+    reader.size = ftell(f);
+    if (reader.size == 0) {
+        fclose(f);
+        return false;
+    }
+
+    reader.data = (uint8_t*)malloc(reader.size);
+
+    fseek(f, 0, SEEK_SET);
+    auto ret = fread(reader.data, sizeof(char), reader.size, f);
+    if (ret < reader.size) {
+        fclose(f);
+        return false;
+    }
+
+    fclose(f);
+
+    return true;
+}
+
+
+static void _unmap(TtfLoader* loader)
+{
+    auto& reader = loader->reader;
+    free(reader.data);
+    reader.data = nullptr;
+    reader.size = 0;
+}
 #endif