internal bool Read(WzFileStream zs)
{
this.Items.Clear();
zs.Seek(this.Offset);
int count = zs.Read4(true);
for (int i = 0; i < count; i++)
{
WzArchiveItem item = null;
WzArchiveItemType itemtype;
string itemname = zs.StringPool.DirectoryRead(out itemtype, WzArchiveItemType.Reference);
if (itemtype == WzArchiveItemType.Directory)
{
item = new WzDirectory(itemname);
}
else if (itemtype == WzArchiveItemType.File)
{
item = new WzFile(itemname, zs.KeyType)
{
Stream = zs.BaseStream
};
}
else
{
throw new InvalidDataException("Undefined item type : " + (int)itemtype);
}
item.Size = zs.Read4(true);
item.Checksum = zs.Read4(true);
uint offKey = HashTools.GenerateOffsetKey((uint)zs.Tell(), this.Archive.DataOffset, this.Archive.Hash);
item.Offset = HashTools.DecryptOffsetHash(zs.Read4u(), offKey, this.Archive.DataOffset);
if ((item.Offset + item.Size) > zs.Length)
{
return(false);
}
this.Add(item);
}
for (int i = 0; i < this.Items.Count; i++)
{
if (this.Items[i].Type == WzArchiveItemType.Directory)
{
(this.Items[i] as WzDirectory).Read(zs);
}
}
return(true);
}
internal override void Write(WzFileStream zf)
{
// start write
int count = this.Items.Count;
long[] itemoff = new long[count];
this.Offset = (uint)zf.Tell();
zf.Write4(count, true);
// write header
for (int i = 0; i < count; i++)
{
WzArchiveItem item = this.Items[i];
zf.StringPool.DirectoryWrite(item.Name, item.Type, WzArchiveItemType.Reference);
zf.Write4(item.Size, true);
zf.Write4(item.Checksum, true);
itemoff[i] = zf.Tell();
zf.Write4u(0u); // reserve
}
// package items
for (int i = 0; i < count; i++)
{
this.Items[i].Write(zf);
}
long endoff = zf.Tell();
// rewrite offset
for (int i = 0; i < count; i++)
{
zf.Seek(itemoff[i]);
uint offKey = HashTools.GenerateOffsetKey((uint)zf.Tell(), this.Archive.DataOffset, this.Archive.Hash);
uint encoff = HashTools.EncryptOffsetHash(this.Items[i].Offset, offKey, this.Archive.DataOffset);
zf.Write4u(encoff);
}
// end write
zf.Seek(endoff);
}