/// <summary>
/// Constructs a KIFINT entry with the specified file name, entry data, parent KIFINT archive.
/// </summary>
/// <param name="fileName">
/// The cached name of the file. Calling <see cref="KifintArchive.KIFENTRY.FileName"/> is wasteful.
/// </param>
/// <param name="kifEntry">The decrypted data for the entry.</param>
/// <param name="kifint">The parent KIFINT arhive.</param>
internal KifintEntry(string fileName, KIFENTRY kifEntry, KifintArchive kifint)
{
Kifint = kifint;
FileName = fileName;
Offset = kifEntry.Offset;
Length = kifEntry.Length;
}
private static void DecryptArchiveSave(KIFHDR hdr, List <KIFENTRY> entries, uint tocSeed, uint fileKey,
Blowfish blowfish, int keyIndex, Stream inStream, Stream outStream, KifintProgressArgs progress,
KifintProgressCallback callback)
{
BinaryReader reader = new BinaryReader(inStream);
BinaryWriter writer = new BinaryWriter(outStream);
const int ProgressThreshold = 1;
progress.EntryName = null;
progress.EntryIndex = 0;
progress.EntryCount = entries.Count;
// Decrypt the KIFINT entries using the file key
for (uint i = 0; i < hdr.EntryCount; i++, progress.EntryIndex++)
{
if (unchecked ((int)i) == keyIndex)
{
continue;
}
KIFENTRY entry = entries[unchecked ((int)i)];
// Give the entry the correct name
UnobfuscateFileName(entry.FileNameRaw, unchecked (tocSeed + i));
// Apply the extra offset to be decrypted
entry.Offset += i;
// Decrypt the entry's length and offset
blowfish.Decrypt(ref entry.Info);
progress.EntryName = entry.FileName;
if (i % ProgressThreshold == 0 || i + 1 == hdr.EntryCount)
{
callback?.Invoke(progress);
}
// Goto the entry's decrypted offset, read the buffer, then decrypt it
inStream.Position = entry.Offset;
byte[] buffer = reader.ReadBytes(entry.Length);
blowfish.Decrypt(buffer, entry.Length & ~7);
// Move to the entry's offset in the output stream and write the buffer
outStream.Position = entry.Offset;
writer.Write(buffer);
// Make sure to reassign the entry to the list, because
// it's not an array and does not return struct references.
entries[unchecked ((int)i)] = entry;
}
entries.RemoveAt(keyIndex);
hdr.EntryCount--;
outStream.Position = 0;
writer.WriteUnmanaged(hdr);
writer.WriteUnmanagedArray(entries);
}
