public static int CheckSumRead(string filename, bool testDeep, out byte[] crc, out byte[] bMD5, out byte[] bSHA1, out ulong size)
{
bMD5 = null;
bSHA1 = null;
crc = null;
size = 0;
Stream ds;
int errorCode = IO.FileStream.OpenFileRead(filename, out ds);
if (errorCode != 0)
return errorCode;
CRC32Hash crc32 = new CRC32Hash();
MD5 md5 = null;
if (testDeep) md5 = MD5.Create();
SHA1 sha1 = null;
if (testDeep) sha1 = SHA1.Create();
size = (ulong)ds.Length;
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();
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;
}
}
public static RvFile CheckSumRead(Stream ds, int offset)
{
ds.Position = 0;
RvFile file=new RvFile();
CRC32Hash crc32 = new CRC32Hash();
MD5 md5 = MD5.Create();
SHA1 sha1 = SHA1.Create();
CRC32Hash altCrc32 = null;
MD5 altMd5 = null;
SHA1 altSha1 = null;
if (offset > 0)
{
altCrc32 = new CRC32Hash();
altMd5 = MD5.Create();
altSha1 = SHA1.Create();
}
file.Size = (ulong)ds.Length;
long sizetogo = ds.Length;
// just read header into main Hash
if (offset > 0)
{
int sizenow = sizetogo > offset ? offset : (int)sizetogo;
ds.Read(Buffer, 0, sizenow);
crc32.TransformBlock(Buffer, 0, sizenow, null, 0);
md5.TransformBlock(Buffer, 0, sizenow, null, 0);
sha1.TransformBlock(Buffer, 0, sizenow, null, 0);
sizetogo -= sizenow;
}
while (sizetogo > 0)
{
int sizenow = sizetogo > Buffersize ? Buffersize : (int)sizetogo;
ds.Read(Buffer, 0, sizenow);
crc32.TransformBlock(Buffer, 0, sizenow, null, 0);
md5.TransformBlock(Buffer, 0, sizenow, null, 0);
sha1.TransformBlock(Buffer, 0, sizenow, null, 0);
if (offset > 0)
{
altCrc32.TransformBlock(Buffer, 0, sizenow, null, 0);
altMd5.TransformBlock(Buffer, 0, sizenow, null, 0);
altSha1.TransformBlock(Buffer, 0, sizenow, null, 0);
}
sizetogo -= sizenow;
}
crc32.TransformFinalBlock(Buffer, 0, 0);
md5.TransformFinalBlock(Buffer, 0, 0);
sha1.TransformFinalBlock(Buffer, 0, 0);
file.CRC = crc32.Hash;
file.MD5 = md5.Hash;
file.SHA1 = sha1.Hash;
if (offset > 0)
{
altCrc32.TransformFinalBlock(Buffer, 0, 0);
altMd5.TransformFinalBlock(Buffer, 0, 0);
altSha1.TransformFinalBlock(Buffer, 0, 0);
file.AltSize = (ulong?)(ds.Length - offset);
file.AltCRC = altCrc32.Hash;
file.AltMD5 = altMd5.Hash;
file.AltSHA1 = altSha1.Hash;
}
else
{
file.AltSize = null;
file.AltCRC = null;
file.AltSHA1 = null;
file.AltMD5 = null;
}
ds.Close();
return file;
}
public ZipReturn ReadGZip(string filename, bool deepScan)
{
_filename = "";
if (!IO.File.Exists(filename))
{
return ZipReturn.ZipErrorFileNotFound;
}
_filename = filename;
int errorCode = IO.FileStream.OpenFileRead(filename, out _zipFs);
if (errorCode != 0)
{
if (errorCode == 32)
return ZipReturn.ZipFileLocked;
return ZipReturn.ZipErrorOpeningFile;
}
BinaryReader zipBr = new BinaryReader(_zipFs);
byte ID1 = zipBr.ReadByte();
byte ID2 = zipBr.ReadByte();
if (ID1 != 0x1f || ID2 != 0x8b)
{
_zipFs.Close();
return ZipReturn.ZipSignatureError;
}
byte CM = zipBr.ReadByte();
if (CM != 8)
{
_zipFs.Close();
return ZipReturn.ZipUnsupportedCompression;
}
byte FLG = zipBr.ReadByte();
UInt32 MTime = zipBr.ReadUInt32();
byte XFL = zipBr.ReadByte();
byte OS = zipBr.ReadByte();
//if FLG.FEXTRA set
if ((FLG & 0x4) == 0x4)
{
int XLen = zipBr.ReadInt16();
byte[] bytes = zipBr.ReadBytes(XLen);
if (XLen == 28)
{
md5Hash = new byte[16];
Array.Copy(bytes, 0, md5Hash, 0, 16);
crc = new byte[4];
Array.Copy(bytes, 16, crc, 0, 4);
uncompressedSize = BitConverter.ToUInt64(bytes, 20);
}
}
//if FLG.FNAME set
if ((FLG & 0x8) == 0x8)
{
int XLen = zipBr.ReadInt16();
byte[] bytes = zipBr.ReadBytes(XLen);
}
//if FLG.FComment set
if ((FLG & 0x10) == 0x10)
{
int XLen = zipBr.ReadInt16();
byte[] bytes = zipBr.ReadBytes(XLen);
}
//if FLG.FHCRC set
if ((FLG & 0x2) == 0x2)
{
uint crc16 = zipBr.ReadUInt16();
}
compressedSize = (ulong)(_zipFs.Length - _zipFs.Position) - 8;
datapos = _zipFs.Position;
if (deepScan)
{
Stream sInput = new DeflateStream(_zipFs, CompressionMode.Decompress, true);
CRC32Hash crc32 = new CRC32Hash();
MD5 lmd5 = MD5.Create();
SHA1 lsha1 = SHA1.Create();
if (_buffer == null)
_buffer = new byte[Buffersize];
ulong uncompressedRead = 0;
int sizeRead = 1;
while (sizeRead > 0)
{
sizeRead = sInput.Read(_buffer, 0, Buffersize);
if (sizeRead > 0)
{
crc32.TransformBlock(_buffer, 0, sizeRead, null, 0);
lmd5.TransformBlock(_buffer, 0, sizeRead, null, 0);
lsha1.TransformBlock(_buffer, 0, sizeRead, null, 0);
}
uncompressedRead += (ulong)sizeRead;
}
crc32.TransformFinalBlock(_buffer, 0, 0);
lmd5.TransformFinalBlock(_buffer, 0, 0);
lsha1.TransformFinalBlock(_buffer, 0, 0);
sInput.Close();
sInput.Dispose();
if (uncompressedSize != 0)
{
if (uncompressedSize != uncompressedRead)
{
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
else
uncompressedSize = uncompressedRead;
byte[] testcrc = crc32.Hash;
if (crc != null)
{
for (int i = 0; i < 4; i++)
{
if (crc[i] == testcrc[i]) continue;
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
else
crc = testcrc;
byte[] testmd5 = lmd5.Hash;
if (md5Hash != null)
{
for (int i = 0; i < 16; i++)
{
if (md5Hash[i] == testmd5[i]) continue;
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
else
md5Hash = testmd5;
byte[] testsha1 = lsha1.Hash;
if (sha1Hash != null)
{
for (int i = 0; i < 20; i++)
{
if (sha1Hash[i] == testsha1[i]) continue;
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
else
sha1Hash = testsha1;
sInput.Close();
sInput.Dispose();
}
_zipFs.Position = _zipFs.Length - 8;
byte[] gzcrc = zipBr.ReadBytes(4);
uint gzLength = zipBr.ReadUInt32();
if (crc != null)
{
for (int i = 0; i < 4; i++)
{
if (gzcrc[3 - i] == crc[i]) continue;
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
else
crc = new[] { gzcrc[3], gzcrc[2], gzcrc[1], gzcrc[0] };
if (uncompressedSize != 0)
{
if (gzLength != (uncompressedSize & 0xffffffff))
{
_zipFs.Close();
return ZipReturn.ZipDecodeError;
}
}
_zipFs.Close();
return ZipReturn.ZipGood;
}
