/// <summary>
///
/// </summary>
/// <param name="buf"></param>
/// <param name="pos"></param>
/// <param name="len"></param>
/// <returns></returns>
public byte[] GetChecksum2(byte[] buf, int pos, int len)
{
byte[] buf1 = new byte[len + 4];
for (int j = 0; j < len; j++)
{
buf1[j] = buf[pos + j];
}
MDFour mdFour = new MDFour(options);
mdFour.Begin();
if (options.checksumSeed != 0)
{
SIVAL(ref buf1, len, (UInt32)options.checksumSeed);
len += 4;
}
int i;
for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK)
{
mdFour.Update(buf1, i, CSUM_CHUNK);
}
if (len - i > 0 || options.protocolVersion >= 27)
{
mdFour.Update(buf1, i, (UInt32)(len - i));
}
return(mdFour.Result());
}
public byte[] GetChecksum2(byte[] buf, int off, int len)
{
byte[] buf1 = new byte[len + 4];
for(int j = 0; j < len ; j++)
buf1[j] = buf[off + j];
MDFour m = new MDFour(options);
m.Begin();
if(options.checksumSeed != 0)
{
SIVAL(ref buf1, len, (UInt32)options.checksumSeed);
len += 4;
}
int i;
for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK)
m.Update(buf1, i, CSUM_CHUNK);
if (len - i > 0 || options.protocolVersion >= 27)
m.Update(buf1, i, (UInt32)(len-i));
return m.Result();
}
/// <summary>
///
/// </summary>
/// <param name="fileName"></param>
/// <param name="sum"></param>
/// <param name="size"></param>
/// <returns></returns>
public bool FileCheckSum(string fileName, ref byte[] sum, int size)
{
int i;
MDFour mdFour = new MDFour(options);
sum = new byte[MD4_SUM_LENGTH];
try
{
using (var fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
MapFile buf = new MapFile(fileStream, size, Options.MAX_MAP_SIZE, CSUM_CHUNK);
mdFour.Begin();
for (i = 0; i + CSUM_CHUNK <= size; i += CSUM_CHUNK)
{
int offset = buf.MapPtr(i, CSUM_CHUNK);
mdFour.Update(buf.p, offset, CSUM_CHUNK);
}
if (size - i > 0 || options.protocolVersion >= 27)
{
int offset = buf.MapPtr(i, size - i);
mdFour.Update(buf.p, offset, (UInt32)(size - i));
}
sum = mdFour.Result();
fileStream.Close();
//buf.UnMapFile(); //@fixed useless string
return(true);
}
}
catch (Exception)
{
}
return(false);
}
public bool FileCheckSum(string fileName, ref byte[] sum, int size)
{
int i;
MDFour m = new MDFour(options);
sum = new byte[MD4_SUM_LENGTH];
Stream fd;
try
{
fd = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
} catch (Exception)
{
return(false);
}
MapFile buf = new MapFile(fd, size, Options.MAX_MAP_SIZE, CSUM_CHUNK);
m.Begin();
for (i = 0; i + CSUM_CHUNK <= size; i += CSUM_CHUNK)
{
int offset = buf.MapPtr(i, CSUM_CHUNK);
m.Update(buf.p, offset, CSUM_CHUNK);
}
if (size - i > 0 || options.protocolVersion >= 27)
{
int offset = buf.MapPtr(i, size - i);
m.Update(buf.p, offset, (UInt32)(size - i));
}
sum = m.Result();
fd.Close();
buf.UnMapFile();
return(true);
}
public bool FileCheckSum(string fileName, ref byte[] sum, int size)
{
int i;
MDFour m =new MDFour(options);
sum = new byte[MD4_SUM_LENGTH];
Stream fd;
try
{
fd = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
} catch(Exception)
{
return false;
}
MapFile buf = new MapFile(fd, size, Options.MAX_MAP_SIZE, CSUM_CHUNK);
m.Begin();
for(i = 0; i + CSUM_CHUNK <= size; i += CSUM_CHUNK)
{
int offset = buf.MapPtr(i, CSUM_CHUNK);
m.Update(buf.p, offset, CSUM_CHUNK);
}
if (size - i > 0 || options.protocolVersion >= 27)
{
int offset = buf.MapPtr(i, size-i);
m.Update(buf.p, offset, (UInt32)(size-i));
}
sum = m.Result();
fd.Close();
buf.UnMapFile();
return true;
}
public Sum(Options opt)
{
options = opt;
md = new MDFour(opt);
}
/// <summary>
///
/// </summary>
/// <param name="fileName"></param>
/// <param name="sum"></param>
/// <param name="size"></param>
/// <returns></returns>
public bool FileCheckSum(string fileName, ref byte[] sum, int size)
{
int i;
MDFour mdFour = new MDFour(options);
sum = new byte[MD4_SUM_LENGTH];
try
{
using (var fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
MapFile buf = new MapFile(fileStream, size, Options.MAX_MAP_SIZE, CSUM_CHUNK);
mdFour.Begin();
for (i = 0; i + CSUM_CHUNK <= size; i += CSUM_CHUNK)
{
int offset = buf.MapPtr(i, CSUM_CHUNK);
mdFour.Update(buf.p, offset, CSUM_CHUNK);
}
if (size - i > 0 || options.protocolVersion >= 27)
{
int offset = buf.MapPtr(i, size - i);
mdFour.Update(buf.p, offset, (UInt32)(size - i));
}
sum = mdFour.Result();
fileStream.Close();
//buf.UnMapFile(); //@fixed useless string
return true;
}
}
catch (Exception)
{
}
return false;
}
public Sum(Options opt)
{
options = opt;
md = new MDFour(opt);
}