using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using UnityEngine;
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using System.Text;
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using System.Reflection;
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using System;
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using System.Linq;
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namespace UnityFS
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{
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/// <summary>
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/// Unity 生成的二进制文件(本代码不支持5.x之前的版本)
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/// </summary>
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public unsafe class UnityBinFile
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{
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/*
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* MonoManager: idx: 6;
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* type: metaData.types[objects[6].typeID]
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*/
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public const int kMonoManagerIdx = 6;
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public FileHeader header;
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public MetaData metaData;
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public ScriptsData scriptsData;
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private Stream _originStream;
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public void LoadFromStream(Stream source)
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{
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_originStream = source;
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using (var br = new BinaryReader(source, Encoding.UTF8, true))
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{
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header.LoadFromStream(br);
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// 按理说 metaData 应该新开一个buffer来避免加载时的对齐逻辑问题，但由于 sizeof(Header) = 20，已经对齐到4了，所以可以连续读
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metaData.LoadFromStream(br, header.dataOffset);
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scriptsData = metaData.GetScriptData(br);
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}
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}
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public void Load(string path)
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{
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LoadFromStream(new MemoryStream(File.ReadAllBytes(path)));
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}
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public void AddScriptingAssemblies(List<string> assemblies)
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{
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foreach (string name in assemblies)
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{
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if (!scriptsData.dllNames.Contains(name))
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{
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scriptsData.dllNames.Add(name);
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scriptsData.dllTypes.Add(16); // user dll type
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Debug.Log($"[PatchScriptAssembliesJson] add dll:{name} to globalgamemanagers");
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}
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}
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}
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public byte[] CreatePatchedBytes()
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{
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var fsR = _originStream;
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fsR.Position = 0;
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var brR = new BinaryReader(fsR, Encoding.UTF8, true);
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var ms = new MemoryStream((int)(header.fileSize * 1.5f));
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var bw = new BinaryWriter(ms, Encoding.UTF8, true);
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/*
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* 开始写入data
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* dll名称列表存储于 data 区段，修改其数据并不会影响 MetaData 大小，因此 dataOffset 不会改变
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*/
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ms.Position = header.dataOffset;
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Dictionary<long, ObjectInfo> newObjInfos = new Dictionary<long, ObjectInfo>();
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foreach (var kv in metaData.objects)
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{
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long objID = kv.Key;
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ObjectInfo objInfo = kv.Value;
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byte[] buff = new byte[objInfo.size];
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fsR.Position = objInfo.realPos;
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brR.Read(buff, 0, buff.Length);
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{// unity 的数据偏移貌似会对齐到 8
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int newPos = (((int)ms.Position + 7) >> 3) << 3;
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int gapSize = newPos - (int)ms.Position;
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for (int i = 0; i < gapSize; i++)
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bw.Write((byte)0);
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objInfo.dataPos = (uint)ms.Position - header.dataOffset; // 重定位数据偏移
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}
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if (objID != kMonoManagerIdx)
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bw.Write(buff, 0, buff.Length);
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else
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objInfo.size = (uint)scriptsData.SaveToStream(bw);
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newObjInfos.Add(objID, objInfo);
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}
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metaData.objects = newObjInfos;
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header.fileSize = (uint)ms.Position;
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ms.Position = 0;
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header.SaveToStream(bw);
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metaData.SaveToStream(bw);
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brR.Close();
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// 写入新文件
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ms.Position = 0;
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return ms.ToArray();
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}
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public void Save(string newPath)
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{
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byte[] patchedBytes = CreatePatchedBytes();
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File.WriteAllBytes(newPath, patchedBytes);
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}
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}
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}
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