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(RPM): moved archive index interpreter logic to separate class.

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This commit is contained in:
morkt 2017-11-21 12:10:18 +04:00
parent 5d3b66824c
commit aec330d8a5
1 changed files with 92 additions and 69 deletions
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161
ArcFormats/RPM/ArcARC.cs
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@ -92,7 +92,9 @@ namespace GameRes.Formats.Rpm
uint is_compressed = file.View.ReadUInt32 (4);
if (is_compressed > 1) // should be either 0 or 1
return null;
var scheme = GuessScheme (file, count);
var index_reader = new ArcIndexReader (file, count, is_compressed != 0);
var scheme = index_reader.GuessScheme (8, new int[] { 0x20, 0x18 });
// additional filename extension check avoids dialog popup on false positives
if (null == scheme && KnownSchemes.Count > 0 && file.Name.HasExtension (".arc"))
scheme = QueryScheme();
@ -104,35 +106,9 @@ namespace GameRes.Formats.Rpm
&& VFS.IsPathEqualsToFileName (file.Name, "instdata.arc"))
scheme = new EncryptionScheme ("inst", scheme.NameLength);
int index_size = count * (scheme.NameLength + 12);
var index = new byte[index_size];
if (index_size != file.View.Read (8, index, 0, (uint)index_size))
var dir = index_reader.ReadIndex (8, scheme);
if (null == dir)
return null;
DecryptIndex (index, scheme.Keyword);
uint data_offset = LittleEndian.ToUInt32 (index, scheme.NameLength + 8);
if (data_offset != 8 + index_size)
return null;
int index_offset = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = Binary.GetCString (index, index_offset, scheme.NameLength);
index_offset += scheme.NameLength;
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.UnpackedSize = LittleEndian.ToUInt32 (index, index_offset);
entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
entry.Offset = LittleEndian.ToUInt32 (index, index_offset+8);
entry.IsPacked = is_compressed != 0;
if (0 != entry.Size)
{
if (entry.Offset < data_offset || !entry.CheckPlacement (file.MaxOffset))
return null;
}
dir.Add (entry);
index_offset += 12;
}
return new ArcFile (file, this, dir);
}
@ -147,18 +123,98 @@ namespace GameRes.Formats.Rpm
return new LzssStream (input);
}
EncryptionScheme GuessScheme (ArcView file, int count)
public override ResourceOptions GetDefaultOptions ()
{
int[] possible_sizes = { 0x20, 0x18 };
byte[] first_entry = new byte[possible_sizes[0] + 12];
if (first_entry.Length != file.View.Read (8, first_entry, 0, (uint)first_entry.Length))
return new RpmOptions {
Scheme = GetScheme (Settings.Default.RPMScheme),
};
}
public override object GetAccessWidget ()
{
return new WidgetARC();
}
EncryptionScheme QueryScheme ()
{
var options = Query<RpmOptions> (arcStrings.RPMEncryptedNotice);
return options.Scheme;
}
static EncryptionScheme GetScheme (string title)
{
EncryptionScheme scheme = null;
KnownSchemes.TryGetValue (title, out scheme);
return scheme;
}
}
internal sealed class ArcIndexReader
{
ArcView m_file;
int m_count;
bool m_is_compressed;
public ArcIndexReader (ArcView file, int count, bool is_compressed)
{
m_file = file;
m_count = count;
m_is_compressed = is_compressed;
}
public List<Entry> ReadIndex (long offset, EncryptionScheme scheme)
{
int index_size = m_count * (scheme.NameLength + 12);
var index = m_file.View.ReadBytes (offset, (uint)index_size);
if (index.Length != index_size)
return null;
DecryptIndex (index, scheme.Keyword);
uint data_offset = LittleEndian.ToUInt32 (index, scheme.NameLength + 8);
if (data_offset != offset + index_size)
return null;
int index_offset = 0;
var dir = new List<Entry> (m_count);
for (int i = 0; i < m_count; ++i)
{
var name = Binary.GetCString (index, index_offset, scheme.NameLength);
index_offset += scheme.NameLength;
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.UnpackedSize = LittleEndian.ToUInt32 (index, index_offset);
entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
entry.Offset = LittleEndian.ToUInt32 (index, index_offset+8);
entry.IsPacked = m_is_compressed;
if (0 != entry.Size)
{
if (entry.Offset < data_offset || !entry.CheckPlacement (m_file.MaxOffset))
return null;
}
dir.Add (entry);
index_offset += 12;
}
return dir;
}
internal static void DecryptIndex (byte[] data, string key)
{
for (int i = 0; i < data.Length; ++i)
{
data[i] += (byte)key[i % key.Length];
}
}
public EncryptionScheme GuessScheme (int index_offset, int[] possible_name_sizes)
{
byte[] first_entry = new byte[possible_name_sizes[0] + 12];
if (first_entry.Length != m_file.View.Read (index_offset, first_entry, 0, (uint)first_entry.Length))
return null;
byte[] key_bits = new byte[4];
byte[] actual_offset = new byte[4];
foreach (var name_length in possible_sizes)
foreach (var name_length in possible_name_sizes)
{
int first_offset = 8 + count * (name_length + 12);
if (first_offset >= file.MaxOffset)
int first_offset = index_offset + m_count * (name_length + 12);
if (first_offset >= m_file.MaxOffset)
continue;
LittleEndian.Pack (first_offset, actual_offset, 0);
int i;
@ -208,38 +264,5 @@ namespace GameRes.Formats.Rpm
}
return -1;
}
private void DecryptIndex (byte[] data, string key)
{
for (int i = 0; i < data.Length; ++i)
{
data[i] += (byte)key[i % key.Length];
}
}
public override ResourceOptions GetDefaultOptions ()
{
return new RpmOptions {
Scheme = GetScheme (Settings.Default.RPMScheme),
};
}
public override object GetAccessWidget ()
{
return new WidgetARC();
}
EncryptionScheme QueryScheme ()
{
var options = Query<RpmOptions> (arcStrings.RPMEncryptedNotice);
return options.Scheme;
}
static EncryptionScheme GetScheme (string title)
{
EncryptionScheme scheme = null;
KnownSchemes.TryGetValue (title, out scheme);
return scheme;
}
}
}