private bool TryGetHashEntry(string filename, out MpqHash hash)
{
var index = StormBuffer.HashString(filename, 0);
index &= _mpqHeader.HashTableSize - 1;
var name = MpqHash.GetHashedFileName(filename);
for (var i = index; i < _hashTable.Size; ++i)
{
hash = _hashTable[i];
if (hash.Name == name)
{
return(true);
}
}
for (uint i = 0; i < index; ++i)
{
hash = _hashTable[i];
if (hash.Name == name)
{
return(true);
}
}
hash = default;
return(false);
}
public static ulong GetHashedFileName(string fileName)
{
if (fileName.Any(c => c >= 0x200))
{
throw new ArgumentException($"One or more of the characters in the input string have a numerical value of 0x200 or larger.", nameof(fileName));
}
return(CombineNames(StormBuffer.HashString(fileName, 0x100), StormBuffer.HashString(fileName, 0x200)));
}
public static uint GetIndex(string path)
{
if (path.Any(c => c >= 0x200))
{
throw new ArgumentException($"One or more of the characters in the input string have a numerical value of 0x200 or larger.", nameof(path));
}
return(StormBuffer.HashString(path, 0));
}
private IEnumerable <MpqHash> GetHashEntries(string filename)
{
var index = StormBuffer.HashString(filename, 0);
index &= _mpqHeader.HashTableSize - 1;
var name = MpqHash.GetHashedFileName(filename);
var foundAnyHash = false;
for (var i = index; i < _hashTable.Size; ++i)
{
var hash = _hashTable[i];
if (hash.Name == name)
{
yield return(hash);
foundAnyHash = true;
}
else if (hash.IsEmpty && foundAnyHash)
{
yield break;
}
}
for (uint i = 0; i < index; ++i)
{
var hash = _hashTable[i];
if (hash.Name == name)
{
yield return(hash);
foundAnyHash = true;
}
else if (hash.IsEmpty && foundAnyHash)
{
yield break;
}
}
}
/// <summary>
/// Decrypts the contents of the <see cref="MpqTable"/>.
/// </summary>
/// <param name="data">The encrypted entries in the table.</param>
internal void Decrypt(byte[] data)
{
StormBuffer.DecryptBlock(data, StormBuffer.HashString(Key, 0x300));
}
/// <summary>
/// Encrypts the contents of the <see cref="MpqTable"/>.
/// </summary>
/// <param name="data">The unencrypted entries in the table.</param>
public void Encrypt(byte[] data)
{
StormBuffer.EncryptBlock(data, StormBuffer.HashString(Key, 0x300));
}
/// <summary>
/// Initializes a new instance of the <see cref="MpqHash"/> struct.
/// </summary>
/// <param name="fileName"></param>
/// <param name="mask"></param>
/// <param name="locale"></param>
/// <param name="blockIndex"></param>
public MpqHash(string fileName, uint mask, MpqLocale locale, uint blockIndex)
: this(StormBuffer.HashString(fileName, 0x100), StormBuffer.HashString(fileName, 0x200), locale, blockIndex, mask)
{
}
/// <summary>
///
/// </summary>
/// <param name="path"></param>
/// <param name="mask"></param>
/// <returns></returns>
public static uint GetIndex(string path, uint mask)
{
return(StormBuffer.HashString(path, 0) & mask);
}
public static ulong GetHashedFileName(string fileName)
{
return(CombineNames(StormBuffer.HashString(fileName, 0x100), StormBuffer.HashString(fileName, 0x200)));
}