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Update UpdateList.cs #39

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Update UpdateList.cs #39

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18 changes: 15 additions & 3 deletions PangLib.UpdateList/UpdateList.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,23 +31,35 @@ public UpdateList(string filePath)
///
/// Saves the parsed updatelist in the Document instance attribute
/// </summary>
public void Parse()
public void Parse(bool decrypt = true)
{
if (DecryptionKey == null)
{
throw new NullReferenceException("DecryptionKey needs to be set using the SetDecryptionKey instance method!");
}

Span<byte> updateList = File.ReadAllBytes(FilePath);

for (int i = 0; i < updateList.Length; i += 8)
if(decrypt)
{ for (int i = 0; i < updateList.Length; i += 8)
{
Span<byte> chunk = updateList.Slice(i, 8);
Span<uint> decrypted = XTEA.Decipher(16, MemoryMarshal.Cast<byte, uint>(chunk).ToArray(), DecryptionKey);
Span<byte> resource = MemoryMarshal.AsBytes(decrypted);
resource.CopyTo(chunk);
}
}
else
{

var newArray = new byte[updateList.Length - updateList.Length % 8 + 8];
updateList.CopyTo(newArray);
updateList = newArray;
for (int i = 0; i < updateList.Length; i += 8)
{
Span<byte> chunk = updateList.Slice(i, 8);
MemoryMarshal.AsBytes<uint>(XTEA.Encipher(16, MemoryMarshal.Cast<byte, uint>(chunk).ToArray(), DecryptionKey)).CopyTo(chunk);
}
}
Document = Encoding.UTF8.GetString(updateList.ToArray());
}

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