public MixFile(string filename, PackageHashType type, int priority)
{
this.filename = filename;
this.priority = priority;
this.type = type;
s = GlobalFileSystem.Open(filename);
// Detect format type
s.Seek(0, SeekOrigin.Begin);
var isCncMix = s.ReadUInt16() != 0;
// The C&C mix format doesn't contain any flags or encryption
var isEncrypted = false;
if (!isCncMix)
{
isEncrypted = (s.ReadUInt16() & 0x2) != 0;
}
List <PackageEntry> entries;
if (isEncrypted)
{
long unused;
entries = ParseHeader(DecryptHeader(s, 4, out dataStart), 0, out unused);
}
else
{
entries = ParseHeader(s, isCncMix ? 0 : 4, out dataStart);
}
index = entries.ToDictionaryWithConflictLog(x => x.Hash,
"{0} ({1} format, Encrypted: {2}, DataStart: {3})".F(filename, isCncMix ? "C&C" : "RA/TS/RA2", isEncrypted, dataStart),
null, x => "(offs={0}, len={1})".F(x.Offset, x.Length));
}
public MixFile(string filename, PackageHashType type, int priority)
{
this.filename = filename;
this.priority = priority;
this.type = type;
s = GlobalFileSystem.Open(filename);
// Detect format type
s.Seek(0, SeekOrigin.Begin);
var isCncMix = s.ReadUInt16() != 0;
// The C&C mix format doesn't contain any flags or encryption
var isEncrypted = false;
if (!isCncMix)
isEncrypted = (s.ReadUInt16() & 0x2) != 0;
List<PackageEntry> entries;
if (isEncrypted)
{
long unused;
entries = ParseHeader(DecryptHeader(s, 4, out dataStart), 0, out unused);
}
else
entries = ParseHeader(s, isCncMix ? 0 : 4, out dataStart);
index = entries.ToDictionaryWithConflictLog(x => x.Hash,
"{0} ({1} format, Encrypted: {2}, DataStart: {3})".F(filename, (isCncMix ? "C&C" : "RA/TS/RA2"), isEncrypted, dataStart),
null, x => "(offs={0}, len={1})".F(x.Offset, x.Length)
);
}
// Save a mix to disk with the given contents
public MixFile(FileSystem context, string filename, int priority, Dictionary <string, byte[]> contents)
{
this.filename = filename;
this.priority = priority;
this.type = PackageHashType.Classic;
this.context = context;
if (File.Exists(filename))
{
File.Delete(filename);
}
s = File.Create(filename);
try
{
index = new Dictionary <uint, PackageEntry>();
contents.Add("local mix database.dat", new XccLocalDatabase(contents.Keys.Append("local mix database.dat")).Data());
Write(contents);
}
catch
{
Dispose();
throw;
}
}
public static uint HashFilename(string name, PackageHashType type)
{
var padding = name.Length % 4 != 0 ? 4 - name.Length % 4 : 0;
var paddedLength = name.Length + padding;
// Avoid stack overflows by only allocating small buffers on the stack, and larger ones on the heap.
// 64 chars covers most real filenames.
var upperPaddedName = paddedLength < 64 ? stackalloc char[paddedLength] : new char[paddedLength];
name.AsSpan().ToUpperInvariant(upperPaddedName);
switch (type)
{
case PackageHashType.Classic:
{
for (var p = 0; p < padding; p++)
{
upperPaddedName[paddedLength - 1 - p] = '\0';
}
var asciiBytes = paddedLength < 64 ? stackalloc byte[paddedLength] : new byte[paddedLength];
Encoding.ASCII.GetBytes(upperPaddedName, asciiBytes);
var data = MemoryMarshal.Cast <byte, uint>(asciiBytes);
var result = 0u;
foreach (var next in data)
{
result = ((result << 1) | (result >> 31)) + next;
}
return(result);
}
case PackageHashType.CRC32:
{
var length = name.Length;
var lengthRoundedDownToFour = length / 4 * 4;
if (length != lengthRoundedDownToFour)
{
upperPaddedName[length] = (char)(length - lengthRoundedDownToFour);
for (var p = 1; p < padding; p++)
{
upperPaddedName[length + p] = upperPaddedName[lengthRoundedDownToFour];
}
}
var asciiBytes = paddedLength < 64 ? stackalloc byte[paddedLength] : new byte[paddedLength];
Encoding.ASCII.GetBytes(upperPaddedName, asciiBytes);
return(CRC32.Calculate(asciiBytes));
}
default: throw new NotImplementedException($"Unknown hash type `{type}`");
}
}
static Stream GetFromCache(PackageHashType type, string filename)
{
var index = type == PackageHashType.CRC32 ? crcHashIndex : classicHashIndex;
var folder = index[PackageEntry.HashFilename(filename, type)]
.Where(x => x.Exists(filename))
.MinByOrDefault(x => x.Priority);
if (folder != null)
{
return(folder.GetContent(filename));
}
return(null);
}
// Save a mix to disk with the given contents
public MixFile(string filename, int priority, Dictionary<string, byte[]> contents)
{
this.filename = filename;
this.priority = priority;
this.type = PackageHashType.Classic;
if (File.Exists(filename))
File.Delete(filename);
s = File.Create(filename);
index = new Dictionary<uint, PackageEntry>();
contents.Add("local mix database.dat", new XccLocalDatabase(contents.Keys.Append("local mix database.dat")).Data());
Write(contents);
}
public static uint HashFilename(string name, PackageHashType type)
{
switch (type)
{
case PackageHashType.Classic:
{
name = name.ToUpperInvariant();
if (name.Length % 4 != 0)
{
name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
}
using (var ms = new MemoryStream(Encoding.ASCII.GetBytes(name)))
{
var len = name.Length >> 2;
uint result = 0;
while (len-- != 0)
{
result = ((result << 1) | (result >> 31)) + ms.ReadUInt32();
}
return(result);
}
}
case PackageHashType.CRC32:
{
name = name.ToUpperInvariant();
var l = name.Length;
var a = l >> 2;
if ((l & 3) != 0)
{
name += (char)(l - (a << 2));
var i = 3 - (l & 3);
while (i-- != 0)
{
name += name[a << 2];
}
}
return(CRC32.Calculate(Encoding.ASCII.GetBytes(name)));
}
default: throw new NotImplementedException("Unknown hash type `{0}`".F(type));
}
}
public static uint HashFilename(string name, PackageHashType type)
{
switch (type)
{
case PackageHashType.Classic:
{
name = name.ToUpperInvariant();
if (name.Length % 4 != 0)
{
name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
}
var result = 0u;
var data = Encoding.ASCII.GetBytes(name);
var i = 0;
while (i < data.Length)
{
var next = (uint)(data[i++] | data[i++] << 8 | data[i++] << 16 | data[i++] << 24);
result = ((result << 1) | (result >> 31)) + next;
}
return(result);
}
case PackageHashType.CRC32:
{
name = name.ToUpperInvariant();
var l = name.Length;
var a = l >> 2;
if ((l & 3) != 0)
{
name += (char)(l - (a << 2));
var i = 3 - (l & 3);
while (i-- != 0)
{
name += name[a << 2];
}
}
return(CRC32.Calculate(Encoding.ASCII.GetBytes(name)));
}
default: throw new NotImplementedException($"Unknown hash type `{type}`");
}
}
public static uint HashFilename(string name, PackageHashType type)
{
switch (type)
{
case PackageHashType.Classic:
{
name = name.ToUpperInvariant();
if (name.Length % 4 != 0)
name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
var ms = new MemoryStream(Encoding.ASCII.GetBytes(name));
var reader = new BinaryReader(ms);
var len = name.Length >> 2;
uint result = 0;
while (len-- != 0)
result = ((result << 1) | (result >> 31)) + reader.ReadUInt32();
return result;
}
case PackageHashType.CRC32:
{
name = name.ToUpperInvariant();
var l = name.Length;
var a = l >> 2;
if ((l & 3) != 0)
{
name += (char)(l - (a << 2));
var i = 3 - (l & 3);
while (i-- != 0)
name += name[a << 2];
}
return CRC32.Calculate(Encoding.ASCII.GetBytes(name));
}
default: throw new NotImplementedException("Unknown hash type `{0}`".F(type));
}
}
static Stream GetFromCache(PackageHashType type, string filename)
{
var index = type == PackageHashType.CRC32 ? crcHashIndex : classicHashIndex;
var folder = index[PackageEntry.HashFilename(filename, type)]
.Where(x => x.Exists(filename))
.MinByOrDefault(x => x.Priority);
if (folder != null)
return folder.GetContent(filename);
return null;
}
public static uint HashFilename(string name, PackageHashType type)
{
return PackageEntry.HashFilename(name, type);
}
public static uint HashFilename(string name, PackageHashType type)
{
return(PackageEntry.HashFilename(name, type));
}
