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(XP3): implemented LZ4-compressed entries.

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This commit is contained in:
morkt 2017-01-14 13:02:20 +04:00
parent 2dbc380b80
commit 832a1a3ff0
1 changed files with 32 additions and 1 deletions
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33
ArcFormats/KiriKiri/ArcXP3.cs
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@ -379,11 +379,17 @@ NextEntry:
else
input = new Xp3Stream (arc.File, xp3_entry);
if (entry.Size <= 5 || "image" == entry.Type || "audio" == entry.Type)
if (xp3_entry.UnpackedSize <= 5 || "audio" == entry.Type)
return input;
var header = new byte[5];
input.Read (header, 0, 5);
if (0x184D2204 == header.ToInt32 (0)) // LZ4 magic
{
// assume no scripts are compressed using LZ4, return decompressed stream right away
return DecompressLz4 (xp3_entry, header, input);
}
if (0xFE == header[0] && 0xFE == header[1] && header[2] < 3 && 0xFF == header[3] && 0xFE == header[4])
return DecryptScript (header[2], input, xp3_entry.UnpackedSize);
@ -393,6 +399,31 @@ NextEntry:
return input;
}
Stream DecompressLz4 (Xp3Entry entry, byte[] header, Stream input)
{
if (header.Length != 5)
throw new ArgumentException ("Invalid header length for DecompressLz4", "header");
var info = new Lz4FrameInfo (header[4]);
info.SetBlockSize (input.ReadByte());
if (info.HasContentLength)
{
input.Read (header, 0, 4);
long length = header.ToUInt32 (0);
input.Read (header, 0, 4);
length |= (long)header.ToUInt32 (0) << 32;
info.OriginalLength = length;
entry.UnpackedSize = (uint)length;
entry.IsPacked = true;
}
if (info.HasDictionary)
{
input.Read (header, 0, 4);
info.DictionaryId = header.ToInt32 (0);
}
input.ReadByte(); // skip descriptor checksum
return new Lz4Stream (input, info);
}
Stream DecryptScript (int enc_type, Stream input, uint unpacked_size)
{
using (var reader = new BinaryReader (input, Encoding.Unicode, true))