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Copy pathProjectFileReader.cs
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175 lines (156 loc) · 7.2 KB
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using QIQI.EProjectFile.Encryption;
using QIQI.EProjectFile.Internal;
using System;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace QIQI.EProjectFile
{
public class ProjectFileReader : IDisposable
{
public delegate string OnInputPassword(string passwordHint);
public bool IsFinish { get; private set; } = false;
private BinaryReader reader;
public bool CryptEC { get; } = false;
public ProjectFileReader(Stream stream, OnInputPassword inputPassword = null)
{
reader = new BinaryReader(stream, Encoding.GetEncoding("gbk"));
int magic1 = reader.ReadInt32();
int magic2 = reader.ReadInt32();
if (magic1 == 0x454C5457) // WTLE
{
switch (magic2)
{
case 0x00000001:
{
string password = inputPassword?.Invoke(null);
if (string.IsNullOrEmpty(password))
{
throw new Exception("没有输入密码 或 未正确响应InputPassword事件");
}
const int lengthOfRead = 8;
var cryptoTransform = new EStdCryptoTransform(EplSecret.EStd.Factory.Create(Encoding.GetEncoding("gbk").GetBytes(password)));
// 分块的时候，是不区分加密与非加密部分的，不进行 SeekToBegin 直接解密会导致分块错误
// 然而我们不能保证 Stream 一定 CanSeek，因此使用 PrefixedStream
var cryptoStream = new CryptoStream(new PrefixedStream(stream, new byte[lengthOfRead]), cryptoTransform, CryptoStreamMode.Read);
// 跳过非加密部分（但使得 CryptoStream 按与加密部分相同的方式来将这些数据考虑进分块过程）
cryptoStream.Read(new byte[lengthOfRead], 0, lengthOfRead);
reader = new BinaryReader(cryptoStream);
if (!reader.ReadBytes(cryptoTransform.SecretId.Length).SequenceEqual(cryptoTransform.SecretId))
{
throw new Exception("密码错误");
}
}
break;
case 0x00020001:
{
CryptEC = true;
int tip_bytes = reader.ReadInt32();
string tip = reader.ReadStringWithFixedLength(Encoding.GetEncoding("gbk"), tip_bytes);
string password = inputPassword?.Invoke(tip);
if (string.IsNullOrEmpty(password))
{
throw new Exception("没有输入密码 或 未正确响应InputPassword事件");
}
int lengthOfRead = 4 /* [int]magic1 */ + 4 /* [int]magic2 */ + 4 /* [int]tip_bytes */ + tip_bytes;
var cryptoTransform = new CryptoECTransform(EplSecret.EC.Factory.Create(Encoding.GetEncoding("gbk").GetBytes(password)));
// 分块的时候，是不区分加密与非加密部分的，不进行 SeekToBegin 直接解密会导致分块错误
// 然而我们不能保证 Stream 一定 CanSeek，因此使用 PrefixedStream
var cryptoStream = new CryptoStream(new PrefixedStream(stream, new byte[lengthOfRead]), cryptoTransform, CryptoStreamMode.Read);
// 跳过非加密部分（但使得 CryptoStream 按与加密部分相同的方式来将这些数据考虑进分块过程）
cryptoStream.Read(new byte[lengthOfRead], 0, lengthOfRead);
reader = new BinaryReader(cryptoStream);
if (!reader.ReadBytes(cryptoTransform.SecretId.Length).SequenceEqual(cryptoTransform.SecretId))
{
throw new Exception("密码错误");
}
}
break;
default:
throw new Exception($"不支持此类加密文件 [Type=0x{magic2:x8}]");
}
magic1 = reader.ReadInt32();
magic2 = reader.ReadInt32();
}
if (magic1 != 0x54574E43 || magic2 != 0x47525045) // CNWTEPRG
{
throw new Exception("不是易语言工程文件");
}
}
public RawSectionInfo ReadSection()
{
if (IsFinish)
{
throw new EndOfStreamException();
}
RawSectionInfo section = new RawSectionInfo();
if (!(reader.ReadInt32() == 0x15117319))
{
throw new Exception("Magic错误");
}
reader.ReadInt32(); // Skip InfoCheckSum
section.Key = reader.ReadInt32();
section.Name = DecodeName(section.Key, reader.ReadBytes(30));
reader.ReadInt16(); // 对齐填充（确认于易语言V5.71）
reader.ReadInt32(); // Skip Index
section.IsOptional = reader.ReadInt32() != 0;
reader.ReadInt32(); // Skip DataCheckSum
int dataLength = reader.ReadInt32();
if (CryptEC)
{
dataLength ^= 1;
}
reader.ReadBytes(40); // 保留未用（确认于易语言V5.71）
section.Data = new byte[dataLength];
reader.Read(section.Data, 0, dataLength);
if (section.Key == 0x07007319)
{
IsFinish = true;
}
return section;
}
private static string DecodeName(int key, byte[] encodedName)
{
if (encodedName == null)
{
return string.Empty;
}
byte[] r = (byte[])encodedName.Clone();
if (key != 0x07007319)
{
var keyBytes = unchecked(new byte[] { (byte)key, (byte)(key >> 8), (byte)(key >> 16), (byte)(key >> 24) });
for (int i = 0; i < r.Length; i++)
{
r[i] ^= keyBytes[(i + 1) % 4];
}
}
int count = Array.IndexOf<byte>(r, 0);
if (count != -1)
{
var t = new byte[count];
Array.Copy(r, t, count);
r = t;
}
return Encoding.GetEncoding("gbk").GetString(r);
}
#region IDisposable Support
private bool disposedValue = false; // 要检测冗余调用
protected virtual void Dispose(bool disposing)
{
if (!disposedValue)
{
if (disposing)
{
reader.Dispose();
}
disposedValue = true;
}
}
public void Dispose()
{
Dispose(true);
}
#endregion
}
}