public static uint GetCrc32(params byte[] data)
{
var n = new Crc32Helper();
n.ComputeCrc32(data);
return n.Crc32Value;
}
public static uint GetCrc32(params byte[] data)
{
var n = new Crc32Helper();
n.ComputeCrc32(data);
return(n.Crc32Value);
}
public static void Main(string[] args)
{
Console.WriteLine("ScriptCoreLib.Archive.Zip");
Console.WriteLine("" + Crc32Helper.GetCrc32(1, 2, 3));
var n = DateTime.Now;
foreach (var x in n.GetType().GetPropertyGetMethodsForType(typeof(int)))
{
Console.WriteLine(x.Name + " " + (int)x.Invoke(n, new object[0]));
}
Console.WriteLine("" + ZIPFile.ToMsDosDateTime(DateTime.Now));
var m = new MemoryStream(File.ReadAllBytes("archive.zip"));
var r = new BinaryReader(m);
ZIPFile z = r;
foreach (var f in z.Entries)
{
Console.WriteLine(f.FileName + " " + f.Data.Length + " bytes");
Console.WriteLine(Encoding.ASCII.GetString(f.Data.ToArray()));
Console.WriteLine();
}
var zz = new ZIPFile
{
{ "dynamic0.txt", "zip!" },
{ "dynamic1.txt", "hey" },
};
zz.Add("dynamic2.txt", 0x30, 0x31, 0x32, 0xff);
zz.Add("archive.zip", File.ReadAllBytes("archive.zip"));
var zzm = new MemoryStream();
using (var w = new BinaryWriter(zzm))
{
zz.WriteTo(w);
}
File.WriteAllBytes("dynamic1.zip", zzm.ToArray());
}
public void WriteTo(BinaryWriter w)
{
// http://www.pkware.com/documents/casestudies/APPNOTE.TXT
var offsets = new Queue();
var Items = this.Entries;
#region Local file header:
foreach (var v in Items)
{
// if we box unit, it will actually represent Long
// this is for tostring functionality
offsets.Enqueue((uint)w.BaseStream.Position);
//var h = v.Header;
var file_name = Encoding.ASCII.GetBytes(v.FileName);
// local file header signature 4 bytes (0x04034b50)
w.Write(ZIPFileEntryHeader.FileHeader);
// version needed to extract 2 bytes
w.Write((short)0x000A);
// general purpose bit flag 2 bytes
w.Write((short)0);
// compression method 2 bytes
w.Write(ZIPFileEntryHeader.UNCOMPRESSED);
// last mod file time 2 bytes
// last mod file date 2 bytes
w.WriteUInt32(ToMsDosDateTime(DateTime.Now));
// crc-32 4 bytes
w.WriteUInt32((uint)Crc32Helper.GetCrc32(v.Data.ToArray()));
// compressed size 4 bytes
w.WriteUInt32((uint)v.Data.Length);
// uncompressed size 4 bytes
w.WriteUInt32((uint)v.Data.Length);
// file name length 2 bytes
w.Write((short)file_name.Length);
// extra field length 2 bytes
w.Write((short)0);
// file name (variable size)
w.Write(file_name);
// extra field (variable size)
v.Data.WriteTo(w.BaseStream);
}
#endregion
var p = w.BaseStream.Position;
#region Central directory structure
foreach (var v in Items)
{
//var h = v.Header;
var offset = (uint)offsets.Dequeue();
var file_name = Encoding.ASCII.GetBytes(v.FileName);
// central file header signature 4 bytes (0x02014b50)
w.Write((int)0x02014b50);
// version made by 2 bytes
w.WriteUInt16((ushort)0x0014);
// version needed to extract 2 bytes
w.WriteUInt16((ushort)0x000A);
// general purpose bit flag 2 bytes
w.WriteUInt16((ushort)0x0000);
// compression method 2 bytes
w.Write(ZIPFileEntryHeader.UNCOMPRESSED);
// last mod file time 2 bytes
// last mod file date 2 bytes
w.WriteUInt32(ToMsDosDateTime(DateTime.Now));
// crc-32 4 bytes
w.WriteUInt32((uint)Crc32Helper.GetCrc32(v.Data.ToArray()));
// compressed size 4 bytes
w.WriteUInt32((uint)v.Data.Length);
// uncompressed size 4 bytes
w.WriteUInt32((uint)v.Data.Length);
// file name length 2 bytes
w.WriteUInt16((ushort)file_name.Length);
// extra field length 2 bytes
w.WriteUInt16((ushort)0x0000);
// file comment length 2 bytes
w.WriteUInt16((ushort)0x0000);
// disk number start 2 bytes
w.WriteUInt16((ushort)0x0000);
// internal file attributes 2 bytes
w.WriteUInt16((ushort)0x0000);
// external file attributes 4 bytes
w.Write((int)0x0000);
// relative offset of local header 4 bytes
w.WriteUInt32((uint)offset);
// file name (variable size)
w.Write(file_name);
// extra field (variable size)
// file comment (variable size)
}
#endregion
//
var q = w.BaseStream.Position;
var z = q - p;
#region I. End of central directory record:
//end of central dir signature 4 bytes (0x06054b50)
w.WriteUInt32((uint)0x06054b50);
//number of this disk 2 bytes
w.WriteUInt16((ushort)0);
//number of the disk with the
//start of the central directory 2 bytes
w.WriteUInt16((ushort)0);
//total number of entries in the
//central directory on this disk 2 bytes
w.WriteUInt16((ushort)Items.Length);
//total number of entries in
//the central directory 2 bytes
w.WriteUInt16((ushort)Items.Length);
//size of the central directory 4 bytes
w.WriteUInt32((uint)z);
//offset of start of central
//directory with respect to
//the starting disk number 4 bytes
w.WriteUInt32((uint)p);
//.ZIP file comment length 2 bytes
w.WriteUInt16((ushort)0);
//.ZIP file comment (variable size)
#endregion
}
