public static int CheckSumRead(string filename, bool testDeep, out byte[] crc, out byte[] bMD5, out byte[] bSHA1)
{
bMD5 = null;
bSHA1 = null;
crc = null;
Stream ds=null;
CRC32Hash crc32 = new CRC32Hash();
MD5 md5 = null;
if (testDeep) md5 = MD5.Create();
SHA1 sha1 = null;
if (testDeep) sha1 = SHA1.Create();
try
{
int errorCode = IO.FileStream.OpenFileRead(filename, out ds);
if (errorCode != 0)
return errorCode;
long sizetogo = ds.Length;
while (sizetogo > 0)
{
int sizenow = sizetogo > Buffersize ? Buffersize : (int)sizetogo;
ds.Read(Buffer, 0, sizenow);
crc32.TransformBlock(Buffer, 0, sizenow, null, 0);
if (testDeep) md5.TransformBlock(Buffer, 0, sizenow, null, 0);
if (testDeep) sha1.TransformBlock(Buffer, 0, sizenow, null, 0);
sizetogo -= sizenow;
}
crc32.TransformFinalBlock(Buffer, 0, 0);
if (testDeep) md5.TransformFinalBlock(Buffer, 0, 0);
if (testDeep) sha1.TransformFinalBlock(Buffer, 0, 0);
ds.Close();
}
catch
{
if (ds != null)
ds.Close();
return 0x17;
}
crc = crc32.Hash;
if (testDeep) bMD5 = md5.Hash;
if (testDeep) bSHA1 = sha1.Hash;
return 0;
}
public void LocalFileCheck()
{
if (FileStatus != ZipReturn.ZipUntested) return;
try
{
Stream sInput = null;
_zipFs.Seek((long)_dataLocation, SeekOrigin.Begin);
switch (_compressionMethod)
{
case 8:
sInput = new DeflateStream(_zipFs, CompressionMode.Decompress, true);
break;
case 0:
sInput = _zipFs;
break;
}
if (sInput == null)
{
FileStatus = ZipReturn.ZipErrorGettingDataStream;
return;
}
CRC32Hash crc32 = new CRC32Hash();
MD5 lmd5 = System.Security.Cryptography.MD5.Create();
SHA1 lsha1 = System.Security.Cryptography.SHA1.Create();
ulong sizetogo = UncompressedSize;
if (_buffer == null)
_buffer = new byte[Buffersize];
while (sizetogo > 0)
{
int sizenow = sizetogo > Buffersize ? Buffersize : (int)sizetogo;
sInput.Read(_buffer, 0, sizenow);
crc32.TransformBlock(_buffer, 0, sizenow, null, 0);
lmd5.TransformBlock(_buffer, 0, sizenow, null, 0);
lsha1.TransformBlock(_buffer, 0, sizenow, null, 0);
sizetogo = sizetogo - (ulong)sizenow;
}
crc32.TransformFinalBlock(_buffer, 0, 0);
lmd5.TransformFinalBlock(_buffer, 0, 0);
lsha1.TransformFinalBlock(_buffer, 0, 0);
byte[] testcrc = crc32.Hash;
md5 = lmd5.Hash;
sha1 = lsha1.Hash;
if (_compressionMethod == 8)
{
sInput.Close();
sInput.Dispose();
}
FileStatus = ByteArrCompare(CRC, testcrc) ? ZipReturn.ZipGood : ZipReturn.ZipCRCDecodeError;
}
catch
{
FileStatus = ZipReturn.ZipDecodeError;
}
}
