/// <summary>
/// 2.获取第一块区域（资源包信息区域）的字节大小
/// </summary>
/// <returns> 资源包信息区域的字节大小 </returns>
private static int GetPackageInfoRegionSize()
{
//计算资源包类型名字符串所占字节
int packageTypeNameSize = MyConverter.String2Bytes(PackType).Length;
//资源包版本（uint) + 资源包类型名字节大小(ushort) + 资源包类型名(UTF8) + 资源包大小(uint)
int packageRegionSize = 4 + 2 + packageTypeNameSize + 4;
return(packageRegionSize);
}
/// <summary>
/// 3.获取第二块区域（文件信息集合区域）的字节大小
/// </summary>
/// <returns>文件信息集合区域的字节大小</returns>
private static int GetFileInfosRegionSize()
{
//文件信息集合所占字节大小(int) + 文件信息集合里的文件信息个数（int)
int size = 4 + 4;
//单个文件信息的组合
//2.获取到信息块的字节长度
byte[] infoDatas = null;
for (int n = 0; n < resInfoList.Count; n++)
{
byte[] strDatas = MyConverter.String2Bytes(resInfoList [n].fileName);
ushort strLength = (ushort)strDatas.Length;
AddToEnd(ref infoDatas, MyConverter.Ushort2Bytes(strLength)); //文件名字节大小（ushort)
AddToEnd(ref infoDatas, strDatas); //文件名(UTF8)
AddToEnd(ref infoDatas, MyConverter.Uint2Bytes(resInfoList [n].startPos)); //文件起始位置(uint)
AddToEnd(ref infoDatas, MyConverter.Int2Bytes(resInfoList [n].size)); //文件大小(int)
}
size += infoDatas.Length;
infoDatas = null;
return(size);
}
/// <summary>
/// 写入所有数据到资源包文件中
/// </summary>
/// <param name="packagePath">打包完成后资源包的路径</param>
/// <param name="filePaths">要打包的文件路径集合</param>
/// <param name="frontRegionsSize">第一块区域与第二块区域所占的字节大小和</param>
private static void WriteAllDatas(string packagePath, string[] filePaths, ref int frontRegionsSize)
{
BinaryWriter totalWriter = null;
FileStream totalStream = null;
//初始化FileStream文件流
//totalStream = new FileStream(desFilePath, FileMode.Append);
totalStream = new FileStream(packagePath, FileMode.Create);
//以FileStream文件流来初始化BinaryWriter书写器，此用以合并分割的文件
totalWriter = new BinaryWriter(totalStream);
//1.资源包信息区域
totalWriter.Write(MyConverter.Int2Bytes(PackVersion)); //1.1资源包版本(int)
byte[] resTypeNameData = MyConverter.String2Bytes(PackType);
ushort resTypeNameSize = (ushort)resTypeNameData.Length;
totalWriter.Write(MyConverter.Ushort2Bytes(resTypeNameSize)); //1.2资源包类型名字节大小(ushort)
totalWriter.Write(resTypeNameData); //1.3资源包类型名(UTF8)
//获取第一块区域（资源包信息区域）的字节大小
int packageInfoRegionSize = GetPackageInfoRegionSize();
//获取第二块区域（文件信息集合区域）的字节大小
int fileInfosRegionSize = GetFileInfosRegionSize();
//第一块及第二区域所占字节和
frontRegionsSize = packageInfoRegionSize + fileInfosRegionSize;
//获取文件在资源包中的位置信息及打包后整个资源包的字节大小
uint totalSize = GetFilePositionInfosAndTotalSize(frontRegionsSize);
totalWriter.Write(MyConverter.Uint2Bytes(totalSize)); //1.4资源包大小(uint)
//2.文件信息集合区域
totalWriter.Write(MyConverter.Int2Bytes(fileInfosRegionSize)); //2.1文件信息集合所占字节大小(int)
totalWriter.Write(MyConverter.Int2Bytes(resInfoList.Count)); //2.2文件信息集合里的文件信息个数（int)
byte [] infoDatas = null;
for (int n = 0; n < resInfoList.Count; n++) //2.3各文件信息组合
{
byte[] strDatas = MyConverter.String2Bytes(resInfoList [n].fileName);
ushort strLength = (ushort)strDatas.Length;
AddToEnd(ref infoDatas, MyConverter.Ushort2Bytes(strLength)); //2.3.1文件名字节长度
AddToEnd(ref infoDatas, strDatas); //2.3.2文件名
AddToEnd(ref infoDatas, MyConverter.Uint2Bytes(resInfoList [n].startPos)); //2.3.3文件起始位置
AddToEnd(ref infoDatas, MyConverter.Int2Bytes(resInfoList [n].size)); //2.3.4文件大小
}
totalWriter.Write(infoDatas);
//3.文件数据集合
FileStream tempStream = null;
BinaryReader tempReader = null;
for (int i = 0; i < resInfoList.Count; i++)
{
//1.写入文件头部间隙
if (resInfoList[i].beforeSpace > 0)
{
WriteEmptyBytes(ref totalWriter, resInfoList [i].beforeSpace);
}
//2.写入文件内容
//以小文件所对应的文件名称和打开模式来初始化FileStream文件流，起读取分割作用
tempStream = new FileStream(filePaths [i], FileMode.Open);
tempReader = new BinaryReader(tempStream);
int tempFileLength = (int)tempStream.Length;
if (0 == tempFileLength)
{
Debug.LogError("错误:" + filePaths[i] + "这个文件内容为空");
}
else
{
//读取分割文件中的数据，并生成合并后文件
totalWriter.Write(tempReader.ReadBytes(tempFileLength));
}
//关闭BinaryReader文件阅读器
tempReader.Close();
//关闭FileStream文件流
tempStream.Close();
}
//关闭BinaryWriter文件书写器
totalWriter.Close();
//关闭FileStream文件流
totalStream.Close();
}