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Add LZ77 decompression

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This commit is contained in:
BtbN 2019-04-13 18:33:16 +02:00
parent ff407d4fd6
commit 1fcd2b31b5
3 changed files with 118 additions and 2 deletions
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56
eAmuseCore/Compression/LZ77.cs Normal file
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@ -0,0 +1,56 @@
using System;
using System.Collections.Generic;
using System.Linq;
namespace eAmuseCore.Compression
{
public static class LZ77
{
public static IEnumerable<byte> Decompress(IEnumerable<byte> data)
{
byte[] buffer = new byte[0x1000];
int pos = 0;
int state = 0;
using (var iter = data.GetEnumerator())
{
while (iter.MoveNext())
{
state >>= 1;
if (state <= 1)
{
state = iter.Current | 0x100;
if (!iter.MoveNext())
yield break;
}
if ((state & 1) == 1)
{
yield return iter.Current;
buffer[pos++ & 0xfff] = iter.Current;
}
else
{
byte byte1 = iter.Current;
if (!iter.MoveNext())
yield break;
byte byte2 = iter.Current;
int length = (byte2 & 0xf) + 3;
int distance = (byte1 << 4) | (byte2 >> 4);
if (distance == 0)
yield break;
for (int i = 0; i < length; ++i)
{
byte b = buffer[(pos - distance) & 0xfff];
yield return b;
buffer[pos++ & 0xfff] = b;
}
}
}
}
}
}
}

2
eAmuseCore/Crypto/RC4.cs
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@ -13,7 +13,7 @@ namespace eAmuseCore.Crypto
public static IEnumerable<byte> ApplyEAmuseInfo(string info, IEnumerable<byte> data)
{
if (!info.StartsWith("1-") || info.Count(c => c == '-') != 3 || info.Length != 15)
if (!info.StartsWith("1-") || info.Count(c => c == '-') != 2 || info.Length != 15)
throw new ArgumentException("Unknown E-Amuse-Info format.", "info");
info = info.Substring(2).Replace("-", "");
byte[] key = Enumerable.Range(0, info.Length / 2).Select(i => Convert.ToByte(info.Substring(i * 2, 2), 16)).ToArray();

62
eAmuseTest/Program.cs
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@ -1,4 +1,10 @@
using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using eAmuseCore.Crypto;
using eAmuseCore.Compression;
namespace eAmuseTest
{
@ -6,7 +12,61 @@ namespace eAmuseTest
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
// string url = "/L44/8?model=L44:J:E:A:2018070901&f=gametop.get_pdata";
string compress = "lz77";
string eamuse_info = "1-5ca39858-b503";
// string user_agent = "EAMUSE.XRPC/1.0";
byte[] data = new byte[] {
0xb6, 0x5d, 0x24, 0x57, 0x42, 0x34, 0xa8, 0x8f, 0xc7, 0x6c, 0x3c, 0x05, 0xe4, 0xa1, 0xf9, 0x14,
0x8e, 0xd1, 0xd1, 0x6a, 0xc9, 0xf7, 0x95, 0x50, 0xff, 0xe0, 0x12, 0xf0, 0xbc, 0x25, 0x21, 0x73,
0x9a, 0x90, 0xd4, 0x5c, 0x07, 0xf6, 0x92, 0xd3, 0x72, 0x51, 0x21, 0x2a, 0xa3, 0xd1, 0x0c, 0x19,
0x43, 0xfb, 0x9c, 0x6d, 0x7d, 0xb8, 0xcd, 0x6d, 0x20, 0x0d, 0x5d, 0xa3, 0xda, 0x91, 0x6d, 0x19,
0x9a, 0x8d, 0x60, 0x40, 0x14, 0xda, 0x81, 0xa0, 0xcf, 0x60, 0x95, 0x57, 0xc3, 0x06, 0x86, 0x40,
0x0f, 0xb3, 0x62, 0x4b, 0x6b, 0x71, 0x46, 0x5a, 0x38, 0x8c, 0x36, 0x08, 0x68, 0xc8, 0x60, 0xad,
0x17, 0x0e, 0x97, 0xec, 0x69, 0xaf, 0x5e, 0x73, 0x5f, 0x55, 0xc0, 0x46, 0xbf, 0x21, 0xf1, 0x1a,
0xbc, 0xca, 0x44, 0xa0, 0x52, 0xdf, 0x8d, 0xf4, 0x78, 0xa0, 0xe5, 0x2f, 0xa0, 0x68, 0x49, 0xd6,
0xe0, 0xf7, 0x0c, 0x57, 0x85, 0x23, 0xb5, 0x0e, 0x3a, 0x80, 0x4b, 0x32, 0xe0, 0xaa, 0x2b, 0x50,
0xcf, 0x19, 0xb8, 0x1b, 0x96, 0xc9, 0x81, 0xa3, 0x49, 0x50, 0x9d, 0xe4, 0x9d, 0xb8, 0x5d, 0xff,
0xee, 0xbb, 0xf5, 0x58, 0x78, 0x68, 0x7a, 0xbc, 0x3c, 0x79, 0x82, 0x51, 0xd9, 0x26, 0x1e, 0x5d,
0x26, 0x95, 0x5d, 0x66, 0x1c, 0x87, 0xda, 0x5c, 0x4e, 0x55, 0x9a, 0xaf, 0xa2, 0x5b, 0x4b, 0xde,
0x38, 0x4c, 0x25, 0x3d, 0xb0, 0x65, 0xc3, 0xad, 0xa7, 0x00, 0xbc, 0x55, 0x48, 0x7b, 0x54, 0x5f,
0xc5, 0xe9, 0x1c, 0x52, 0x25, 0xb2, 0x1d, 0xd2, 0x76, 0xa9, 0x74, 0xba, 0x94, 0xd4, 0xd6, 0xc1,
0x20, 0xcf, 0x4c, 0xc2, 0x1d, 0xcf, 0x61, 0x45, 0xf7, 0x4f, 0x32, 0xd6, 0xd6, 0xc7, 0xf0, 0xe1,
0x4b, 0x66, 0x07, 0xc0, 0xd0, 0xb3
};
var decryptedData = RC4.ApplyEAmuseInfo(eamuse_info, data);
if (compress == "lz77")
{
var rawData = LZ77.Decompress(decryptedData);
Console.WriteLine(BytesToString(rawData));
}
else
{
Console.WriteLine(BytesToString(decryptedData));
}
}
private static string BytesToString(IEnumerable<byte> bytes)
{
var sb = new StringBuilder();
foreach (byte b in bytes) {
char c = (char)b;
if (c == '\n')
sb.Append("\\n");
else if (c == '\r')
sb.Append("\\r");
else if (c == '\t')
sb.Append("\\t");
else if (b < 128 && (char.IsLetterOrDigit(c) || char.IsPunctuation(c) || char.IsWhiteSpace(c)))
sb.Append(Convert.ToString(c));
else
sb.Append("\\x" + Convert.ToString(b, 16).PadLeft(2, '0'));
}
return sb.ToString();
}
}
}