/// <summary>
/// zip文件头的实例化
/// </summary>
/// <param name="file">资料实体</param>
/// <returns></returns>
private E_LocalFileHeader FileHeaderInstance(E_SourceFile file)
{
E_LocalFileHeader l = new E_LocalFileHeader();
l.MinExtractVersion = BitConverter.GetBytes((short)0x000a);
l.PurposeFlag = BitConverter.GetBytes((short)0x0800);
//压缩方法使用默认
//文件最后修改时间和日期不用管
l.CRC32 = file.CRC32;
l.CmpSize = BitConverter.GetBytes((int)file.FileSize);
l.UnCmpSize = BitConverter.GetBytes((int)file.FileSize);
l.FileNameLength = BitConverter.GetBytes((short)Encoding.UTF8.GetBytes(file.FileName).Length);
//文件扩展区长度默认为0即可
l.FileName = Encoding.UTF8.GetBytes(file.FileName);
//数据区填充null
l.ExtraField = null;
return(l);
}
/// <summary>
/// zip中央目录的实例化
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
private E_CentralDirFileHeader CentralDirInstance(E_SourceFile file)
{
E_CentralDirFileHeader c = new E_CentralDirFileHeader();
c.MadeVersion = BitConverter.GetBytes((short)0x003F);
c.MinExtractVersion = BitConverter.GetBytes((short)0x000a);
c.PurposeFlag = BitConverter.GetBytes((short)0x0800);
//压缩方法默认0,文件修改时间和日期默认0
c.CRC32 = file.CRC32;
c.CmpSize = BitConverter.GetBytes((int)file.FileSize);
c.UnCmpSize = BitConverter.GetBytes((int)file.FileSize);
c.FileNameLength = BitConverter.GetBytes((short)Encoding.UTF8.GetBytes(file.FileName).Length);
//扩展域长度,文件注释长度,开始位置的磁盘编号,为0即可
c.ExternalFileAttr = BitConverter.GetBytes(0x00000020);
//本地文件头的相对位移具体地方再做计算
c.FileName = Encoding.UTF8.GetBytes(file.FileName);
//扩展域和文件注释内容为null即可
return(c);
}
protected void Page_Load(object sender, EventArgs e)
{
E_CompressConfig VCConfig = new E_CompressConfig();
VCConfig.CRCLevel = Const.EnumCRCLevel.RealTime;
VCompress Vcom = new VCompress(VCConfig);
List <E_SourceFile> fileList = new List <E_SourceFile>();
string dirPath = HttpContext.Current.Server.MapPath("/CompressFile/");
var dir = Directory.GetFiles(dirPath);
foreach (var file in dir)
{
FileInfo fi = new FileInfo(file);
var source = new E_SourceFile();
source.FileName = fi.Name;
source.PhyFilePath = fi.FullName;
source.FileSize = fi.Length;
fileList.Add(source);
}
Vcom.VirDownload(fileList);
HttpContext.Current.Response.End();
}
