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feat: support compressed and embedded EVB package

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There might be a conflict with Experimental/Microsoft/ArcEXE.cs. Maybe add a option later to disable that?
This commit is contained in:
scientificworld
2026-01-18 10:10:35 +08:00
parent 54cc895d1f
commit 87195d8673
2 changed files with 239 additions and 6 deletions
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57
ArcFormats/Enigma/ArcEVB.cs
View File

@@ -29,6 +29,7 @@ using System.IO;
using System.Linq;
using System.Text;
using GameRes.Utility;
using GameRes.Compression;
namespace GameRes.Formats.Enigma {
public enum NodeTypes {
@@ -45,14 +46,33 @@ namespace GameRes.Formats.Enigma {
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public EvbPackOpener() {
Signatures = new uint[] { 0x425645, 0x905a4d, 0 };
}
public override ArcFile TryOpen(ArcView file) {
uint index_size = file.View.ReadUInt32(0x40) + 68;
uint index_offset = 0x4F;
uint base_offset = 0;
if (file.View.AsciiEqual(0, "MZ")) {
var exe = new ExeFile(file);
var sig = new byte[] { 0x45, 0x56, 0x42, 0x00 };
if (exe.ContainsSection(".enigma1")) {
var ofs = exe.FindString(exe.Sections[".enigma1"], sig);
if (ofs != -1)
base_offset = (uint)ofs;
}
if (base_offset == 0)
return null;
}
else if (!file.View.AsciiEqual(0, "EVB"))
return null;
uint index_size = file.View.ReadUInt32(base_offset + 0x40) + base_offset + 68;
uint index_offset = base_offset + 0x4F;
uint file_offset = index_size;
var dir = new List<Entry>();
var name_buffer = new StringBuilder();
var counts = new List<uint> { file.View.ReadUInt32(0x4C) };
var counts = new List<uint> { file.View.ReadUInt32(base_offset + 0x4C) };
var names = new List<string> { "" };
while (index_offset < index_size - 4) {
@@ -73,12 +93,12 @@ namespace GameRes.Formats.Enigma {
index_offset++;
counts[counts.Count - 1]--;
if (type == NodeTypes.File) {
var entry = Create<Entry>(Path.Combine(names.Concat(new[] { name }).ToArray()));
var entry = Create<PackedEntry>(Path.Combine(names.Concat(new[] { name }).ToArray()));
uint unpacked_size = file.View.ReadUInt32(index_offset + 2);
uint size = file.View.ReadUInt32(index_offset + 49);
if (unpacked_size != size)
return null; // packed entry not implemented
entry.IsPacked = unpacked_size != size;
entry.Offset = file_offset;
entry.UnpackedSize = unpacked_size;
entry.Size = size;
file_offset += size;
if (!entry.CheckPlacement(file.MaxOffset))
@@ -106,5 +126,30 @@ namespace GameRes.Formats.Enigma {
return new ArcFile(file, this, dir);
}
public override Stream OpenEntry(ArcFile arc, Entry entry) {
var pent = entry as PackedEntry;
if (pent.IsPacked) {
uint header_size = arc.File.View.ReadUInt32(pent.Offset);
uint offset = header_size;
Stream input = null;
for (uint i = 8; i < header_size; i += 12) {
uint chunk_size = arc.File.View.ReadUInt32(pent.Offset + i);
var chunk = new aPLibStream(
arc.File.CreateStream(pent.Offset + offset, chunk_size)
);
if (input != null)
input = new ConcatStream(input, chunk);
else
input = chunk;
offset += chunk_size;
}
return input;
}
else
return arc.File.CreateStream(pent.Offset, pent.Size);
}
}
}

188
ArcFormats/aPLibStream.cs Normal file
View File

@@ -0,0 +1,188 @@
//! \file aPLibStream.cs
//! \date 2026-01-09
/*
* aPLib compression library - the smaller the better :)
*
* C depacker
*
* Copyright (c) 1998-2014 Joergen Ibsen
* All Rights Reserved
*
* http://www.ibsensoftware.com/
*/
// C# port by scientificworld
using System;
using System.Collections.Generic;
using System.IO;
namespace GameRes.Compression {
public sealed class aPLibCoroutine : Decompressor {
Stream m_input;
uint m_tag;
uint m_bitcount;
public override void Initialize (Stream input) {
m_input = input;
}
protected override IEnumerator<int> Unpack () {
uint offs, len, R0, LWM;
var hist = new List<byte>();
m_bitcount = 0;
R0 = uint.MaxValue; // (uint) -1
LWM = 0;
m_buffer[m_pos] = ReadByte();
hist.Add(m_buffer[m_pos++]);
if (--m_length == 0)
yield return m_pos;
while (true) {
if (GetBit() != 0) {
if (GetBit() != 0) {
if (GetBit() != 0) {
offs = 0;
for (int i = 0; i < 4; i++) {
offs = (offs << 1) + GetBit();
}
if (offs != 0) {
m_buffer[m_pos] = hist[(int)(hist.Count - offs)];
}
else {
m_buffer[m_pos] = 0x00;
}
hist.Add(m_buffer[m_pos++]);
LWM = 0;
if (--m_length == 0)
yield return m_pos;
}
else {
offs = (uint)ReadByte();
len = 2 + (offs & 0x0001);
offs >>= 1;
if (offs != 0) {
for (; len != 0; len--) {
m_buffer[m_pos] = hist[(int)(hist.Count - offs)];
hist.Add(m_buffer[m_pos++]);
if (--m_length == 0)
yield return m_pos;
}
}
else {
yield break;
}
R0 = offs;
LWM = 1;
}
}
else {
offs = GetGamma();
if ((LWM == 0) && (offs == 2)) {
offs = R0;
len = GetGamma();
for (; len != 0; len--) {
m_buffer[m_pos] = hist[(int)(hist.Count - offs)];
hist.Add(m_buffer[m_pos++]);
if (--m_length == 0)
yield return m_pos;
}
}
else {
if (LWM == 0) {
offs -= 3;
}
else {
offs -= 2;
}
offs <<= 8;
offs += (uint)ReadByte();
len = GetGamma();
if (offs >= 32000) {
len++;
}
if (offs >= 1280) {
len++;
}
if (offs < 128) {
len += 2;
}
for (; len != 0; len--) {
m_buffer[m_pos] = hist[(int)(hist.Count - offs)];
hist.Add(m_buffer[m_pos++]);
if (--m_length == 0)
yield return m_pos;
}
R0 = offs;
}
LWM = 1;
}
}
else {
m_buffer[m_pos] = ReadByte();
hist.Add(m_buffer[m_pos++]);
LWM = 0;
if (--m_length == 0)
yield return m_pos;
}
}
}
uint GetBit () {
uint bit;
if (m_bitcount-- == 0) {
m_tag = (uint)ReadByte();
m_bitcount = 7;
}
bit = (m_tag >> 7) & 0x01;
m_tag <<= 1;
return bit;
}
uint GetGamma () {
uint result = 1;
do {
result = (result << 1) + GetBit();
} while (GetBit() != 0);
return result;
}
byte ReadByte () {
int b = m_input.ReadByte();
if (b == -1)
throw new EndOfStreamException();
return (byte)b;
}
}
public class aPLibStream : PackedStream<aPLibCoroutine> {
public aPLibStream (Stream input, CompressionMode mode = CompressionMode.Decompress, bool leave_open = false) : base (input, leave_open) {
if (mode != CompressionMode.Decompress)
throw new NotImplementedException ("aPLibStream compression not implemented");
}
}
}