private void DirectSet(byte[] sha1Code, byte[] sha256Code, byte[] md5Code)
{
this.fileFingerprintType = FileFingerprintType.None;
if (sha1Code != null)
{
if (sha1Code.Length != 20)
{
throw new ArgumentException("SHA1 code length must be 20.", "sha1Code");
}
this.fileFingerprintType |= FileFingerprintType.SHA1;
}
if (sha256Code != null)
{
if (sha256Code.Length != 32)
{
throw new ArgumentException("SHA256 code length must be 32.", "sha1Code");
}
this.fileFingerprintType |= FileFingerprintType.SHA256;
}
if (md5Code != null)
{
if (md5Code.Length != 16)
{
throw new ArgumentException("MD5 code length must be 16.", "sha1Code");
}
this.fileFingerprintType |= FileFingerprintType.MD5;
}
this.sha1Code = sha1Code;
this.sha256Code = sha256Code;
this.md5Code = md5Code;
}
/// <summary>
/// 取两个指纹共同指纹类型进行比较。
/// </summary>
/// <remarks>
/// 当没有共同的指纹类型是将抛出`ArgumentException`。
/// </remarks>
public bool IsFileFingerprintSameMin(FileFingerprint fileFingerprint1, FileFingerprint fileFingerprint2)
{
FileFingerprintType min = fileFingerprint1.FileFingerprintType & fileFingerprint2.FileFingerprintType;
if ((min & FileFingerprintType.All) == FileFingerprintType.None)
{
throw new ArgumentException("The fileFingerprint1.FileFingerprintType & fileFingerprint2.FileFingerprintType == FileFingerprintType.None");
}
return(IsFileFingerprintSame(fileFingerprint1, fileFingerprint2, min));
}
private void FromFile(string path, FileFingerprintType fileFingerprintType)
{
this.fileFingerprintType = fileFingerprintType;
if (fileFingerprintType == FileFingerprintType.None)
{
throw new ArgumentException("Can't be None.", "fileFingerprintType");
}
FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.SequentialScan);
bool moved = false;
if (fileFingerprintType.HasFlag(FileFingerprintType.SHA1))
{
sha1Code = sha1.ComputeHash(fileStream);
moved = true;
}
else
{
sha1Code = null;
}
if (fileFingerprintType.HasFlag(FileFingerprintType.SHA256))
{
if (moved)
{
fileStream.Seek(0, SeekOrigin.Begin);
}
else
{
moved = true;
}
sha256Code = sha256.ComputeHash(fileStream);
}
else
{
sha256Code = null;
}
if (fileFingerprintType.HasFlag(FileFingerprintType.MD5))
{
if (moved)
{
fileStream.Seek(0, SeekOrigin.Begin);
}
md5Code = md5.ComputeHash(fileStream);
}
else
{
md5Code = null;
}
fileStream.Close();
}
public static FileFingerprint FromBase64(string base64)
{
byte[] data = Convert.FromBase64String(base64);
byte[] typeBytes = new byte[2];
Array.Copy(data, 0, typeBytes, 0, 2);
FileFingerprintType type = (FileFingerprintType)BitConverter.ToUInt16(typeBytes);
byte[] sha1Code;
byte[] sha256Code;
byte[] md5Code;
int i = 2;
if (type.HasFlag(FileFingerprintType.SHA1))
{
sha1Code = new byte[20];
Array.Copy(data, i, sha1Code, 0, 20);
i += 20;
}
else
{
sha1Code = null;
}
if (type.HasFlag(FileFingerprintType.SHA256))
{
sha256Code = new byte[32];
Array.Copy(data, i, sha256Code, 0, 32);
i += 32;
}
else
{
sha256Code = null;
}
if (type.HasFlag(FileFingerprintType.MD5))
{
md5Code = new byte[16];
Array.Copy(data, i, md5Code, 0, 16);
}
else
{
md5Code = null;
}
return(new FileFingerprint(sha1Code, sha256Code, md5Code));
}
public FileFingerprint(string path, FileFingerprintType fileFingerprintType = FileFingerprintType.All)
{
FromFile(path, fileFingerprintType);
}
/// <remarks>
/// 当没有共同的指纹类型是将抛出`ArgumentException`。
/// </remarks>
public bool IsFileFingerprintSame(FileFingerprint fileFingerprint1, FileFingerprint fileFingerprint2, FileFingerprintType fileFingerprintType)
{
if (fileFingerprintType == FileFingerprintType.None)
{
throw new ArgumentException("Can't be FileFingerprintType.None.", "fileFingerprintType");
}
if (fileFingerprintType.HasFlag(FileFingerprintType.SHA1))
{
if (ComparerMethods.ComapreSameLengthByteArray(fileFingerprint1.sha1Code, fileFingerprint2.sha1Code) != 0)
{
return(false);
}
}
if (fileFingerprintType.HasFlag(FileFingerprintType.SHA256))
{
if (ComparerMethods.ComapreSameLengthByteArray(fileFingerprint1.sha256Code, fileFingerprint2.sha256Code) != 0)
{
return(false);
}
}
if (fileFingerprintType.HasFlag(FileFingerprintType.MD5))
{
if (ComparerMethods.ComapreSameLengthByteArray(fileFingerprint1.md5Code, fileFingerprint2.md5Code) != 0)
{
return(false);
}
}
return(true);
}
/// <summary>
/// 用该指纹与另一个文件的指纹进行比较。
/// </summary>
/// <param name="path">另一个文件的路径。</param>
/// <param name="fileFingerprint">由另一个文件生成的指纹。</param>
/// <param name="fileFingerprintType">比较的指纹类型。</param>
public bool CheckFile(string path, out FileFingerprint fileFingerprint, FileFingerprintType fileFingerprintType)
{
fileFingerprint = new FileFingerprint(path);
return(IsFileFingerprintSame(this, fileFingerprint, fileFingerprintType));
}
