internal string DecryptName(ArcIndexScheme scheme)
{
int n;
for (n = 0; n < m_name_buf.Length; ++n)
{
if (n > scheme.NameLength)
{
return(null);
}
m_name_buf[n] ^= scheme.NameKey;
if (0 == m_name_buf[n])
{
break;
}
if (m_name_buf[n] < 0x20)
{
return(null);
}
}
if (n != 0)
{
return(Encodings.cp932.GetString(m_name_buf, 0, n));
}
else
{
return(null);
}
}
public List <Entry> Read(ArcIndexScheme scheme)
{
if (scheme.NameLength > m_name_buf.Length)
{
m_name_buf = new byte[scheme.NameLength];
}
m_dir.Clear();
int index_offset = 4;
uint index_size = (uint)(m_count * (scheme.NameLength + 8));
if (index_size > m_file.View.Reserve(index_offset, index_size))
{
return(null);
}
for (int i = 0; i < m_count; ++i)
{
m_file.View.Read(index_offset, m_name_buf, 0, (uint)scheme.NameLength);
string name = DecryptName(scheme);
if (null == name)
{
return(null);
}
index_offset += scheme.NameLength;
var entry = FormatCatalog.Instance.Create <Entry> (name);
entry.Size = m_file.View.ReadUInt32(index_offset) ^ scheme.SizeKey;
entry.Offset = m_file.View.ReadUInt32(index_offset + 4) ^ scheme.OffsetKey;
if (entry.Offset < index_size + 4 || !entry.CheckPlacement(m_file.MaxOffset))
{
return(null);
}
m_dir.Add(entry);
index_offset += 8;
}
return(m_dir);
}
public List <Entry> Read(ArcIndexScheme scheme)
{
if (scheme.NameLength > m_name_buf.Length)
{
m_name_buf = new byte[scheme.NameLength];
}
m_dir.Clear();
int index_offset = 4;
uint index_size = (uint)(m_count * (scheme.NameLength + 8));
if (index_size > m_file.View.Reserve(index_offset, index_size))
{
return(null);
}
for (int i = 0; i < m_count; ++i)
{
m_file.View.Read(index_offset, m_name_buf, 0, (uint)scheme.NameLength);
int n;
for (n = 0; n < m_name_buf.Length; ++n)
{
m_name_buf[n] ^= scheme.NameKey;
if (0 == m_name_buf[n])
{
break;
}
if (m_name_buf[n] < 0x20)
{
return(null);
}
}
if (0 == n)
{
return(null);
}
string name = Encodings.cp932.GetString(m_name_buf, 0, n);
index_offset += scheme.NameLength;
var entry = FormatCatalog.Instance.Create <Entry> (name);
entry.Size = m_file.View.ReadUInt32(index_offset) ^ scheme.SizeKey;
entry.Offset = m_file.View.ReadUInt32(index_offset + 4) ^ scheme.OffsetKey;
if (entry.Offset < index_size + 4 || !entry.CheckPlacement(m_file.MaxOffset))
{
return(null);
}
m_dir.Add(entry);
index_offset += 8;
}
return(m_dir);
}
public override ArcFile TryOpen(ArcView file)
{
uint key = file.View.ReadUInt32(4);
int count = (int)(file.View.ReadUInt32(0) ^ key);
if (!IsSaneCount(count))
{
return(null);
}
byte name_key = file.View.ReadByte(0x23);
var scheme = new ArcIndexScheme {
NameLength = 0x14, NameKey = name_key, SizeKey = key, OffsetKey = key
};
var reader = new Ai5DatIndexReader(file, count);
var dir = reader.Read(scheme);
if (dir != null)
{
return(new ArcFile(file, this, dir));
}
return(null);
}