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(ByteStringEncryptedStream): moved to SimpleEncryption.

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This commit is contained in:
morkt 2016-10-08 05:09:42 +04:00
parent db0d39f863
commit 6867da8a61
2 changed files with 43 additions and 38 deletions
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38
ArcFormats/Emic/ArcPACK.cs
View File

@ -115,42 +115,4 @@ namespace GameRes.Formats.Emic
return input; return input;
} }
} }
internal class ByteStringEncryptedStream : InputProxyStream
{
byte[] m_key;
int m_base_pos;
public ByteStringEncryptedStream (Stream main, long start_pos, byte[] key, bool leave_open = false)
: base (main, leave_open)
{
m_key = key;
m_base_pos = (int)(start_pos % m_key.Length);
}
public override int Read (byte[] buffer, int offset, int count)
{
int start_pos = (int)((m_base_pos + BaseStream.Position) % m_key.Length);
int read = BaseStream.Read (buffer, offset, count);
if (read > 0)
{
for (int i = 0; i < read; ++i)
{
buffer[offset+i] ^= m_key[(start_pos + i) % m_key.Length];
}
}
return read;
}
public override int ReadByte ()
{
long pos = BaseStream.Position;
int b = BaseStream.ReadByte();
if (-1 != b)
{
b ^= m_key[(m_base_pos + pos) % m_key.Length];
}
return b;
}
}
} }

43
ArcFormats/SimpleEncryption.cs
View File

@ -97,4 +97,47 @@ namespace GameRes.Formats
System.GC.SuppressFinalize (this); System.GC.SuppressFinalize (this);
} }
} }
public class ByteStringEncryptedStream : InputProxyStream
{
byte[] m_key;
int m_base_pos;
public ByteStringEncryptedStream (Stream main, byte[] key, bool leave_open = false)
: this (main, 0, key, leave_open)
{
}
public ByteStringEncryptedStream (Stream main, long start_pos, byte[] key, bool leave_open = false)
: base (main, leave_open)
{
m_key = key;
m_base_pos = (int)(start_pos % m_key.Length);
}
public override int Read (byte[] buffer, int offset, int count)
{
int start_pos = (int)((m_base_pos + BaseStream.Position) % m_key.Length);
int read = BaseStream.Read (buffer, offset, count);
if (read > 0)
{
for (int i = 0; i < read; ++i)
{
buffer[offset+i] ^= m_key[(start_pos + i) % m_key.Length];
}
}
return read;
}
public override int ReadByte ()
{
long pos = BaseStream.Position;
int b = BaseStream.ReadByte();
if (-1 != b)
{
b ^= m_key[(m_base_pos + pos) % m_key.Length];
}
return b;
}
}
} }