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(AdvReader): fixed encryption scheme search logic.

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morkt 2015-04-27 21:40:51 +04:00
parent 35ad091adf
commit 9aa4f8bb77
1 changed files with 10 additions and 9 deletions
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19
ArcFormats/ArcAVC.cs
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@ -83,7 +83,8 @@ namespace GameRes.Formats.AVC
internal class AdvReader
{
ArcView m_file;
byte[] m_header = new byte[0x80];
byte[] m_input = new byte[0x80];
byte[] m_header = new byte[0x24];
byte[] m_key = new byte[8];
byte[] m_index;
int m_index_offset;
@ -100,7 +101,7 @@ namespace GameRes.Formats.AVC
public List<Entry> GetIndex ()
{
if (m_header.Length != m_file.View.Read (0, m_header, 0, (uint)m_header.Length))
if (m_input.Length != m_file.View.Read (0, m_input, 0, (uint)m_input.Length))
return null;
foreach (var scheme in KnownSchemes)
{
@ -122,23 +123,23 @@ namespace GameRes.Formats.AVC
// placing predefined string into XORed file is a very smart move
for (int i = 0; i < 8; ++i)
{
var symbol = m_header[header_offset+i] ^ "ARCHIVE\0"[i];
var check = m_header[key_offset+i] ^ symbol;
var symbol = m_input[header_offset+i] ^ "ARCHIVE\0"[i];
var check = m_input[key_offset+i] ^ symbol;
if (check < 0x20 || check > 0x7e)
return false;
Key[i] = (byte)symbol;
}
for (int i = 0x10; i < 0x24; ++i)
m_header[header_offset+i] ^= Key[i&7];
int entry_size = LittleEndian.ToInt32 (m_header, header_offset+0x14);
m_header[i] = (byte)(m_input[header_offset+i] ^ Key[i&7]);
int entry_size = LittleEndian.ToInt32 (m_header, 0x14);
if (0x114 != entry_size)
return false;
m_index_offset = LittleEndian.ToInt32 (m_header, header_offset+0x10);
m_count = LittleEndian.ToInt32 (m_header, header_offset+0x20);
m_index_offset = LittleEndian.ToInt32 (m_header, 0x10);
m_count = LittleEndian.ToInt32 (m_header, 0x20);
if (m_index_offset < 0x24 || (long)m_index_offset+header_offset >= m_file.MaxOffset
|| m_count <= 0 || m_count > 0xffff)
return false;
int index_size = 0x114 * m_count;
int index_size = entry_size * m_count;
if (null == m_index || m_index.Length < index_size)
m_index = new byte[index_size];
if (index_size != m_file.View.Read (m_index_offset+header_offset, m_index, 0, (uint)index_size))