From ae9604faba4fe1b43879efb24665e717397c094d Mon Sep 17 00:00:00 2001
From: Zach Hilman <zachhilman@gmail.com>
Date: Fri, 5 Jul 2019 18:50:50 -0400
Subject: [PATCH] pl_u: Expose method to encrypt TTF to BFTTF

---
 src/core/hle/service/ns/pl_u.cpp | 26 ++++++++++++--------------
 src/core/hle/service/ns/pl_u.h   |  2 ++
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/src/core/hle/service/ns/pl_u.cpp b/src/core/hle/service/ns/pl_u.cpp
index 2a522136d..6d6fdb4ed 100644
--- a/src/core/hle/service/ns/pl_u.cpp
+++ b/src/core/hle/service/ns/pl_u.cpp
@@ -6,13 +6,6 @@
 #include <cstring>
 #include <vector>
 
-#include <FontChineseSimplified.h>
-#include <FontChineseTraditional.h>
-#include <FontExtendedChineseSimplified.h>
-#include <FontKorean.h>
-#include <FontNintendoExtended.h>
-#include <FontStandard.h>
-
 #include "common/assert.h"
 #include "common/common_paths.h"
 #include "common/common_types.h"
@@ -96,13 +89,18 @@ static void DecryptSharedFont(const std::vector<u32>& input, Kernel::PhysicalMem
 
 static void EncryptSharedFont(const std::vector<u8>& input, Kernel::PhysicalMemory& output,
                               std::size_t& offset) {
-    ASSERT_MSG(offset + input.size() + 8 < SHARED_FONT_MEM_SIZE, "Shared fonts exceeds 17mb!");
-    const u32 KEY = EXPECTED_MAGIC ^ EXPECTED_RESULT;
-    std::memcpy(output.data() + offset, &EXPECTED_RESULT, sizeof(u32)); // Magic header
-    const u32 ENC_SIZE = static_cast<u32>(input.size()) ^ KEY;
-    std::memcpy(output.data() + offset + sizeof(u32), &ENC_SIZE, sizeof(u32));
-    std::memcpy(output.data() + offset + (sizeof(u32) * 2), input.data(), input.size());
-    offset += input.size() + (sizeof(u32) * 2);
+    ASSERT_MSG(offset + (input.size() * sizeof(u32)) < SHARED_FONT_MEM_SIZE,
+               "Shared fonts exceeds 17mb!");
+
+    const auto key = Common::swap32(EXPECTED_RESULT ^ EXPECTED_MAGIC);
+    std::vector<u32> transformed_font(input.size() + 2);
+    transformed_font[0] = Common::swap32(EXPECTED_MAGIC);
+    transformed_font[1] = Common::swap32(input.size() * sizeof(u32)) ^ key;
+    std::transform(input.begin(), input.end(), transformed_font.begin() + 2,
+                   [key](u32 in) { return in ^ key; });
+    std::memcpy(output.data() + offset, transformed_font.data(),
+                transformed_font.size() * sizeof(u32));
+    offset += transformed_font.size() * sizeof(u32);
 }
 
 // Helper function to make BuildSharedFontsRawRegions a bit nicer
diff --git a/src/core/hle/service/ns/pl_u.h b/src/core/hle/service/ns/pl_u.h
index 253f26a2a..d62459667 100644
--- a/src/core/hle/service/ns/pl_u.h
+++ b/src/core/hle/service/ns/pl_u.h
@@ -9,6 +9,8 @@
 
 namespace Service::NS {
 
+void EncryptSharedFont(const std::vector<u32>& input, std::vector<u8>& output, std::size_t& offset);
+
 class PL_U final : public ServiceFramework<PL_U> {
 public:
     PL_U();