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using System;
using System.IO;
namespace Ionic.Crc
{
public class CrcCalculatorStream : Stream, IDisposable
{
public long TotalBytesSlurped
{
get
{
return this._Crc32.TotalBytesRead;
}
}
public int Crc
{
get
{
return this._Crc32.Crc32Result;
}
}
public bool LeaveOpen
{
get
{
return this._leaveOpen;
}
set
{
this._leaveOpen = value;
}
}
public override bool CanRead
{
get
{
return this._innerStream.CanRead;
}
}
public override bool CanSeek
{
get
{
return false;
}
}
public override bool CanWrite
{
get
{
return this._innerStream.CanWrite;
}
}
public override long Length
{
get
{
bool flag = this._lengthLimit == CrcCalculatorStream.UnsetLengthLimit;
long result;
if (flag)
{
result = this._innerStream.Length;
}
else
{
result = this._lengthLimit;
}
return result;
}
}
public override long Position
{
get
{
return this._Crc32.TotalBytesRead;
}
set
{
throw new NotSupportedException();
}
}
private static readonly long UnsetLengthLimit = -99L;
internal Stream _innerStream;
private CRC32 _Crc32;
private long _lengthLimit = -99L;
private bool _leaveOpen;
public CrcCalculatorStream(Stream stream) : this(true, CrcCalculatorStream.UnsetLengthLimit, stream, null)
{
}
public CrcCalculatorStream(Stream stream, bool leaveOpen) : this(leaveOpen, CrcCalculatorStream.UnsetLengthLimit, stream, null)
{
}
public CrcCalculatorStream(Stream stream, long length) : this(true, length, stream, null)
{
bool flag = length < 0L;
if (flag)
{
throw new ArgumentException("length");
}
}
public CrcCalculatorStream(Stream stream, long length, bool leaveOpen) : this(leaveOpen, length, stream, null)
{
bool flag = length < 0L;
if (flag)
{
throw new ArgumentException("length");
}
}
public CrcCalculatorStream(Stream stream, long length, bool leaveOpen, CRC32 crc32) : this(leaveOpen, length, stream, crc32)
{
bool flag = length < 0L;
if (flag)
{
throw new ArgumentException("length");
}
}
private CrcCalculatorStream(bool leaveOpen, long length, Stream stream, CRC32 crc32)
{
this._innerStream = stream;
this._Crc32 = (crc32 ?? new CRC32());
this._lengthLimit = length;
this._leaveOpen = leaveOpen;
}
public override int Read(byte[] buffer, int offset, int count)
{
int count2 = count;
bool flag = this._lengthLimit != CrcCalculatorStream.UnsetLengthLimit;
if (flag)
{
bool flag2 = this._Crc32.TotalBytesRead >= this._lengthLimit;
if (flag2)
{
return 0;
}
long num = this._lengthLimit - this._Crc32.TotalBytesRead;
bool flag3 = num < (long)count;
if (flag3)
{
count2 = (int)num;
}
}
int num2 = this._innerStream.Read(buffer, offset, count2);
bool flag4 = num2 > 0;
if (flag4)
{
this._Crc32.SlurpBlock(buffer, offset, num2);
}
return num2;
}
public override void Write(byte[] buffer, int offset, int count)
{
bool flag = count > 0;
if (flag)
{
this._Crc32.SlurpBlock(buffer, offset, count);
}
this._innerStream.Write(buffer, offset, count);
}
public override void Flush()
{
this._innerStream.Flush();
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
void IDisposable.Dispose()
{
this.Close();
}
public override void Close()
{
base.Close();
bool flag = !this._leaveOpen;
if (flag)
{
this._innerStream.Close();
}
}
}
}
|
