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added ICheckSum interface and CheckedStream class.

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Crc32 and Adler32 classes now implement ICheckSum interface.
This commit is contained in:
morkt 2014-08-16 04:23:12 +04:00
parent 089becd4d3
commit 26526a97bb
1 changed files with 66 additions and 4 deletions
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70
GameRes/Utility.cs
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@ -23,6 +23,8 @@
// IN THE SOFTWARE. // IN THE SOFTWARE.
// //
using System.IO;
namespace GameRes.Utility namespace GameRes.Utility
{ {
public static class Binary public static class Binary
@ -102,7 +104,13 @@ namespace GameRes.Utility
} }
} }
public sealed class Crc32 public interface ICheckSum
{
uint Value { get; }
void Update (byte[] buf, int pos, int len);
}
public sealed class Crc32 : ICheckSum
{ {
/* Table of CRCs of all 8-bit messages. */ /* Table of CRCs of all 8-bit messages. */
private static readonly uint[] crc_table = InitializeTable(); private static readonly uint[] crc_table = InitializeTable();
@ -174,7 +182,7 @@ namespace GameRes.Utility
3. This notice may not be removed or altered from any source distribution. 3. This notice may not be removed or altered from any source distribution.
*/ */
public sealed class Adler32 public sealed class Adler32 : ICheckSum
{ {
const uint BASE = 65521; /* largest prime smaller than 65536 */ const uint BASE = 65521; /* largest prime smaller than 65536 */
const int NMAX = 5552; const int NMAX = 5552;
@ -289,14 +297,13 @@ namespace GameRes.Utility
private uint m_adler = 1; private uint m_adler = 1;
public uint Value { get { return m_adler; } } public uint Value { get { return m_adler; } }
public uint Update (byte[] buf, int pos, int len) public void Update (byte[] buf, int pos, int len)
{ {
unsafe unsafe
{ {
fixed (byte* ptr = &buf[pos]) fixed (byte* ptr = &buf[pos])
{ {
m_adler = Update (m_adler, ptr, len); m_adler = Update (m_adler, ptr, len);
return m_adler;
} }
} }
} }
@ -307,4 +314,59 @@ namespace GameRes.Utility
return m_adler; return m_adler;
} }
} }
public class CheckedStream : Stream
{
Stream m_stream;
ICheckSum m_checksum;
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanWrite { get { return m_stream.CanWrite; } }
public override bool CanSeek { get { return m_stream.CanSeek; } }
public override long Length { get { return m_stream.Length; } }
public Stream BaseStream { get { return m_stream; } }
public uint CheckSumValue { get { return m_checksum.Value; } }
public CheckedStream (Stream stream, ICheckSum algorithm)
{
m_stream = stream;
m_checksum = algorithm;
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = m_stream.Read (buffer, offset, count);
if (read > 0)
m_checksum.Update (buffer, offset, read);
return read;
}
public override void Write (byte[] buffer, int offset, int count)
{
m_stream.Write (buffer, offset, count);
m_checksum.Update (buffer, offset, count);
}
public override long Position
{
get { return m_stream.Position; }
set { m_stream.Position = value; }
}
public override void SetLength (long value)
{
m_stream.SetLength (value);
}
public override long Seek (long offset, SeekOrigin origin)
{
return m_stream.Seek (offset, origin);
}
public override void Flush ()
{
m_stream.Flush();
}
}
} }