public override ArcFile TryOpen(ArcView file)
{
int count = file.View.ReadInt32(0);
if (!IsSaneCount(count) || 4 + count * 0x1C >= file.MaxOffset)
{
return(null);
}
var index_reader = new ArcIndexReader(file, count, true);
// var scheme = new EncryptionScheme ("haku", 0x10);
var scheme = index_reader.GuessScheme(4, new int[] { 0x10 });
if (null == scheme)
{
return(null);
}
var dir = index_reader.ReadIndex(4, scheme);
if (null == dir)
{
return(null);
}
return(new ArcFile(file, this, dir));
}
public override ArcFile TryOpen(ArcView file)
{
int count = file.View.ReadInt32(0);
if (!IsSaneCount(count) || 8 + count * MinEntryLength >= file.MaxOffset)
{
return(null);
}
uint is_compressed = file.View.ReadUInt32(4);
if (is_compressed > 1) // should be either 0 or 1
{
return(null);
}
var index_reader = new ArcIndexReader(file, count, is_compressed != 0);
var scheme = index_reader.GuessScheme(8, new int[] { 0x20, 0x18 });
// additional checks to avoid dialog popup on false positives
if (null == scheme && KnownSchemes.Count > 0 && file.Name.HasExtension(".arc"))
{
var first_entry = file.View.ReadBytes(8, 0x20);
if (-1 == Array.FindIndex(first_entry, x => x != 0))
{
return(null);
}
scheme = QueryScheme();
}
if (null == scheme)
{
return(null);
}
// special case for "instdata.arc" archives
if (scheme.Keyword != "inst" &&
VFS.IsPathEqualsToFileName(file.Name, "instdata.arc"))
{
scheme = new EncryptionScheme("inst", scheme.NameLength);
}
var dir = index_reader.ReadIndex(8, scheme);
if (null == dir)
{
return(null);
}
return(new ArcFile(file, this, dir));
}
