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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?
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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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188
ArcFormats/aPLibStream.cs Normal file
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//! \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");
}
}
}