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(ArcOpener.IndexReader): try to guess archive encryption scheme.

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morkt 2015-07-28 12:21:19 +04:00
parent 002298bb93
commit c5ba498983
1 changed files with 70 additions and 0 deletions
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70
ArcFormats/ArcAi5Win.cs
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@ -94,5 +94,75 @@ namespace GameRes.Formats.Elf
} }
return new ArcFile (file, this, dir); return new ArcFile (file, this, dir);
} }
/*
internal class IndexReader
{
ArcView m_file;
int m_count;
byte[] m_first = new byte[0x108];
public const int MinNameLength = 0x10;
public const int MaxNameLength = 0x100;
public IndexReader (ArcView file)
{
m_file = file;
m_count = m_file.View.ReadInt32 (0);
m_file.View.Read (4, m_first, 0, m_first.Length);
}
ArcIndexScheme m_scheme = new ArcIndexScheme();
public ArcIndexScheme Parse ()
{
if (m_count <= 0 || m_count > 0xfffff)
return null;
uint supposed_first_offset = (uint)(m_count * (name_length + 8));
uint first_size = LittleEndian.ToUInt32 (first_entry, name_length);
uint first_offset = LittleEndian.ToUInt32 (first_entry, name_length+4);
uint supposed_offset_key = first_offset ^ supposed_first_offset;
int last_index_offset = 4 + (m_count - 1) * (name_length + 8);
uint last_size = m_file.View.ReadUInt32 (last_index_offset + name_length);
uint last_offset = m_file.View.ReadUInt32 (last_index_offset + name_length + 4);
last_offset ^= supposed_offset_key;
}
bool ParseFirstEntry (int name_length)
{
int index_offset = 4;
}
public byte NameKey { get; private set; }
int GuessNameLength (int initial)
{
int name_pos = initial;
byte sym;
do
{
do
{
sym = first_entry[name_pos++];
}
while (name_pos < MaxNameLength && sym != first_entry[name_pos]);
if (MaxNameLength == name_pos)
return 0;
while (name_pos < MaxNameLength && sym == first_entry[name_pos])
{
++name_pos;
}
if (MaxNameLength == name_pos && sym == first_entry[name_pos] && sym == first_entry[name_pos+1])
return 0;
}
while (name_pos < MinNameLength || 0 != (name_pos & 1));
NameKey = sym;
return name_pos;
}
}
*/
} }
} }