Unity3d热更新（四）：压缩文件

之前提到过通过AssetBundle.CreateFromFile读取本地AssetBundle，因为该方法只能读取未压缩的AssetBundle，所以打包AssetBundle时，需要选择BuildAssetBundleOptions.UncompressedAssetBundle未压缩模式，然后使用LZMA或GZIP压缩后上传服务器。本地下载后需要解压缩保存在Application.persistentDataPath目录下。下面说明如何压缩AssetBundle。首先需要下载7-zip的C#核心文件，下载地址http://www.7-zip.org/sdk.html。


解压后将CS文件夹下的7zip文件夹导入Unity工程，下面是一个Demo，可以直接用。

[csharp] view plaincopy




using UnityEngine;

using System.Collections;

using UnityEditor;

using SevenZip.Compression.LZMA;

using System.IO;

using System;

// 压缩或解压文件

public class CompressAndDecompress : Editor {

// 压缩Unity3D文件

[MenuItem("Compress/Compress Unity3D File")]

static void CompressUnity3DFile()

{

string path = EditorUtility.OpenFilePanel("Compress file", "", "unity3d");

CompressFile(path);

}

// 压缩Lua文件

[MenuItem("Compress/Compress Lua File")]

static void CompressLuaFile()

{

string path = EditorUtility.OpenFilePanel("Compress file", "", "lua");

CompressFile(path);

}

// 压缩文件

static void CompressFile(string path)

{

if (path.Length != 0)

{

int lastDotIndex = path.LastIndexOf(".");

string outputPath = path.Substring(0, lastDotIndex + 1) + "zip";

CompressFileLZMA(path, outputPath);

AssetDatabase.Refresh();

EditorUtility.DisplayDialog("压缩文件", "文件已压缩完成", "确认");

}

}

// 解压Unity3D文件

[MenuItem("Compress/Decompress Unity3D File")]

static void DecompressUnity3DFile()

{

DecompressFile("unity3d");

}

// 解压Lua文件

[MenuItem("Compress/Decompress Lua File")]

static void DecompressLuaFile()

{

DecompressFile("lua");

}

static void DecompressFile(string extension)

{

string path = EditorUtility.OpenFilePanel("Decompress file", "", "zip");

if (path.Length != 0)

{

int lastDotIndex = path.LastIndexOf(".");

string outputPath = path.Substring(0, lastDotIndex + 1) + extension;

DecompressFileLZMA(path, outputPath);

AssetDatabase.Refresh();

EditorUtility.DisplayDialog("解压文件", "文件已解压完成", "确认");

}

}

// 压缩文件夹中的文件

[MenuItem("Compress/Compress Files In Directory")]

static void CompressFilesInDirectory()

{

string path = EditorUtility.OpenFolderPanel("Compress Files In Directory", "", "");

if (path.Length != 0)

{

DirectoryInfo source = new DirectoryInfo(path);

DirectoryInfo target = new DirectoryInfo(path + "_compress");

if (target.Exists)

{

target.Delete(true);

}

target.Create();

target.Refresh();

// 复制源文件夹到目标文件夹

CopyAll(source, target);

ListFiles((FileSystemInfo)target, true);

EditorUtility.DisplayDialog("压缩文件夹", "文件夹中所有的文件已压缩完成", "确认");

}

}

// 解压文件夹中的文件

//[MenuItem("Compress/Decompress Files In Directory")]

static void DecompressFilesInDirectory()

{

string path = EditorUtility.OpenFolderPanel("Decompress Files In Directory", "", "");

if (path.Length != 0)

{

DirectoryInfo source = new DirectoryInfo(path);

DirectoryInfo target = new DirectoryInfo(path + "_decompress");

if (target.Exists)

{

target.Delete(true);

}

target.Create();

target.Refresh();

// 复制源文件夹到目标文件夹

CopyAll(source, target);

ListFiles(target, false);

EditorUtility.DisplayDialog("解压文件夹", "文件夹中所有的文件已解压完成", "确认");

}

}

// 使用LZMA算法压缩文件

private static void CompressFileLZMA(string inFile, string outFile)

{

Encoder coder = new Encoder();

FileStream input = new FileStream(inFile, FileMode.Open);

FileStream output = new FileStream(outFile, FileMode.Create);

coder.WriteCoderProperties(output);

byte[] data = BitConverter.GetBytes(input.Length);

output.Write(data, 0, data.Length);

coder.Code(input, output, input.Length, -1, null);

output.Flush();

output.Close();

input.Close();

}

// 使用LZMA算法解压文件

private static void DecompressFileLZMA(string inFile, string outFile)

{

Decoder coder = new Decoder();

FileStream input = new FileStream(inFile, FileMode.Open);

FileStream output = new FileStream(outFile, FileMode.Create);

byte[] properties = new byte[5];

input.Read(properties, 0, 5);

byte[] fileLengthBytes = new byte[8];

input.Read(fileLengthBytes, 0, 8);

long fileLength = BitConverter.ToInt64(fileLengthBytes, 0);

coder.SetDecoderProperties(properties);

coder.Code(input, output, input.Length, fileLength, null);

output.Flush();

output.Close();

input.Close();

}

// 复制源文件夹到目标文件夹

public static void CopyAll(DirectoryInfo source, DirectoryInfo target, ArrayList extensions = null)

{

if (source.FullName.ToLower() == target.FullName.ToLower())

{

return;

}

// 检测目标文件是否存在，如果不存在，则创建

if (!Directory.Exists(target.FullName))

{

Directory.CreateDirectory(target.FullName);

target.Refresh();

}

// 复制文件至目标文件夹

foreach (FileInfo fi in source.GetFiles())

{

if (extensions == null || extensions.Count == 0)

{

if (fi.Extension != ".meta")

{

fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);

}

}

else

{

if (extensions.Contains(fi.Extension))

{

fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);

}

}

}

// 使用递归复制子文件夹

foreach (DirectoryInfo sourceSubDir in source.GetDirectories())

{

DirectoryInfo targetSubDir = target.CreateSubdirectory(sourceSubDir.Name);

CopyAll(sourceSubDir, targetSubDir, extensions);

}

}

// 遍历文件夹中的所有文件，压缩或解压缩

public static void ListFiles(FileSystemInfo info, bool isCompress)

{

if (!info.Exists)

{

return;

}

DirectoryInfo dir = info as DirectoryInfo;

// 不是目录

if (dir == null)

{

return;

}

FileSystemInfo[] files = dir.GetFileSystemInfos();

for (int i = 0; i < files.Length; i++)

{

FileInfo file = files[i] as FileInfo;

// 是文件

if (file != null)

{

string fullName = file.FullName;

// 如果是压缩文件

if (isCompress)

{

if (file.Extension == ".unity3d" || file.Extension == ".lua")

{

string outputPath = file.FullName.Replace(file.Extension, ".zip");

CompressFileLZMA(fullName, outputPath);

File.Delete(fullName);

}

}

// 如果是解压文件

else

{

if (file.Extension == ".zip")

{

string outputPath = file.FullName.Replace(file.Extension, ".unity3d");

DecompressFileLZMA(fullName, outputPath);

File.Delete(fullName);

}

}

}

else

{

ListFiles(files[i], isCompress);

}

}

}

}