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using LibHac.Common;
using LibHac.Fs;
using LibHac.Fs.Fsa;
using LibHac.FsSystem;
using LibHac.Ncm;
using LibHac.Tools.FsSystem;
using LibHac.Tools.FsSystem.NcaUtils;
using Ryujinx.Common.Memory;
using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.FileSystem;
using Ryujinx.HLE.HOS.Kernel.Memory;
using Ryujinx.HLE.HOS.Services.Sdb.Pl.Types;
using System;
using System.Buffers.Binary;
using System.Collections.Generic;
using System.IO;
namespace Ryujinx.HLE.HOS.Services.Sdb.Pl
{
class SharedFontManager
{
private static readonly uint FontKey = 0x06186249;
private static readonly uint BFTTFMagic = 0x18029a7f;
private readonly Switch _device;
private readonly SharedMemoryStorage _storage;
private struct FontInfo
{
public int Offset;
public int Size;
public FontInfo(int offset, int size)
{
Offset = offset;
Size = size;
}
}
private Dictionary<SharedFontType, FontInfo> _fontData;
public SharedFontManager(Switch device, SharedMemoryStorage storage)
{
_device = device;
_storage = storage;
}
public void Initialize()
{
_fontData?.Clear();
_fontData = null;
}
public void EnsureInitialized(ContentManager contentManager)
{
if (_fontData == null)
{
_storage.ZeroFill();
uint fontOffset = 0;
FontInfo CreateFont(string name)
{
if (contentManager.TryGetFontTitle(name, out ulong fontTitle) && contentManager.TryGetFontFilename(name, out string fontFilename))
{
string contentPath = contentManager.GetInstalledContentPath(fontTitle, StorageId.BuiltInSystem, NcaContentType.Data);
string fontPath = _device.FileSystem.SwitchPathToSystemPath(contentPath);
if (!string.IsNullOrWhiteSpace(fontPath))
{
byte[] data;
using (IStorage ncaFileStream = new LocalStorage(fontPath, FileAccess.Read, FileMode.Open))
{
Nca nca = new Nca(_device.System.KeySet, ncaFileStream);
IFileSystem romfs = nca.OpenFileSystem(NcaSectionType.Data, _device.System.FsIntegrityCheckLevel);
using var fontFile = new UniqueRef<IFile>();
romfs.OpenFile(ref fontFile.Ref, ("/" + fontFilename).ToU8Span(), OpenMode.Read).ThrowIfFailure();
data = DecryptFont(fontFile.Get.AsStream());
}
FontInfo info = new FontInfo((int)fontOffset, data.Length);
WriteMagicAndSize(fontOffset, data.Length);
fontOffset += 8;
uint start = fontOffset;
for (; fontOffset - start < data.Length; fontOffset++)
{
_storage.GetRef<byte>(fontOffset) = data[fontOffset - start];
}
return info;
}
else
{
if (!contentManager.TryGetSystemTitlesName(fontTitle, out string titleName))
{
titleName = "Unknown";
}
throw new InvalidSystemResourceException($"{titleName} ({fontTitle:x8}) system title not found! This font will not work, provide the system archive to fix this error. (See https://github.com/Ryujinx/Ryujinx#requirements for more information)");
}
}
else
{
throw new ArgumentException($"Unknown font \"{name}\"!");
}
}
_fontData = new Dictionary<SharedFontType, FontInfo>
{
{ SharedFontType.JapanUsEurope, CreateFont("FontStandard") },
{ SharedFontType.SimplifiedChinese, CreateFont("FontChineseSimplified") },
{ SharedFontType.SimplifiedChineseEx, CreateFont("FontExtendedChineseSimplified") },
{ SharedFontType.TraditionalChinese, CreateFont("FontChineseTraditional") },
{ SharedFontType.Korean, CreateFont("FontKorean") },
{ SharedFontType.NintendoEx, CreateFont("FontNintendoExtended") }
};
if (fontOffset > Horizon.FontSize)
{
throw new InvalidSystemResourceException("The sum of all fonts size exceed the shared memory size. " +
$"Please make sure that the fonts don't exceed {Horizon.FontSize} bytes in total. (actual size: {fontOffset} bytes).");
}
}
}
private void WriteMagicAndSize(ulong offset, int size)
{
const int Key = 0x49621806;
int encryptedSize = BinaryPrimitives.ReverseEndianness(size ^ Key);
_storage.GetRef<int>(offset + 0) = (int)BFTTFMagic;
_storage.GetRef<int>(offset + 4) = encryptedSize;
}
public int GetFontSize(SharedFontType fontType)
{
EnsureInitialized(_device.System.ContentManager);
return _fontData[fontType].Size;
}
public int GetSharedMemoryAddressOffset(SharedFontType fontType)
{
EnsureInitialized(_device.System.ContentManager);
return _fontData[fontType].Offset + 8;
}
private static byte[] DecryptFont(Stream bfttfStream)
{
static uint KXor(uint data) => data ^ FontKey;
using (BinaryReader reader = new BinaryReader(bfttfStream))
using (MemoryStream ttfStream = MemoryStreamManager.Shared.GetStream())
using (BinaryWriter output = new BinaryWriter(ttfStream))
{
if (KXor(reader.ReadUInt32()) != BFTTFMagic)
{
throw new InvalidDataException("Error: Input file is not in BFTTF format!");
}
bfttfStream.Position += 4;
for (int i = 0; i < (bfttfStream.Length - 8) / 4; i++)
{
output.Write(KXor(reader.ReadUInt32()));
}
return ttfStream.ToArray();
}
}
}
}
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