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REFACTOR: Final cleanup of DiscImageChef.Checksums.

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This commit is contained in:
Natalia Portillo
2017-12-23 16:40:14 +00:00
parent d4bfbf2cae
commit bb0b845da8
13 changed files with 251 additions and 232 deletions
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98
DiscImageChef.Checksums/SpamSumContext.cs
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@@ -45,7 +45,7 @@ using System.Text;
namespace DiscImageChef.Checksums
{
/// <summary>
/// Implements the SpamSum fuzzy hashing algorithm.
/// Implements the SpamSum fuzzy hashing algorithm.
/// </summary>
public class SpamSumContext
{
@@ -65,41 +65,6 @@ namespace DiscImageChef.Checksums
0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F
};
struct RollState
{
public byte[] Window;
// ROLLING_WINDOW
public uint H1;
public uint H2;
public uint H3;
public uint N;
}
/* A blockhash contains a signature state for a specific (implicit) blocksize.
* The blocksize is given by SSDEEP_BS(index). The h and halfh members are the
* FNV hashes, where halfh stops to be reset after digest is SPAMSUM_LENGTH/2
* long. The halfh hash is needed be able to truncate digest for the second
* output hash to stay compatible with ssdeep output. */
struct BlockhashContext
{
public uint H;
public uint Halfh;
public byte[] Digest;
// SPAMSUM_LENGTH
public byte Halfdigest;
public uint Dlen;
}
struct FuzzyState
{
public uint Bhstart;
public uint Bhend;
public BlockhashContext[] Bh;
//NUM_BLOCKHASHES
public ulong TotalSize;
public RollState Roll;
}
FuzzyState self;
void roll_init()
@@ -108,7 +73,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Initializes the SpamSum structures
/// Initializes the SpamSum structures
/// </summary>
public void Init()
{
@@ -254,7 +219,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Updates the hash with data.
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of buffer to hash.</param>
@@ -265,7 +230,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Updates the hash with data.
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
public void Update(byte[] data)
@@ -323,8 +288,8 @@ namespace DiscImageChef.Checksums
if(remain <= 0) throw new Exception("Assertion failed");
result[resultOff] = b64[self.Bh[bi].H % 64];
if(i < 3 || result[resultOff] != result[resultOff - 1] ||
result[resultOff] != result[resultOff - 2] || result[resultOff] != result[resultOff - 3])
if(i < 3 || result[resultOff] != result[resultOff - 1] || result[resultOff] != result[resultOff - 2] ||
result[resultOff] != result[resultOff - 3])
{
++resultOff;
--remain;
@@ -335,8 +300,8 @@ namespace DiscImageChef.Checksums
if(remain <= 0) throw new Exception("Assertion failed");
result[resultOff] = self.Bh[bi].Digest[i];
if(i < 3 || result[resultOff] != result[resultOff - 1] ||
result[resultOff] != result[resultOff - 2] || result[resultOff] != result[resultOff - 3])
if(i < 3 || result[resultOff] != result[resultOff - 1] || result[resultOff] != result[resultOff - 2] ||
result[resultOff] != result[resultOff - 3])
{
++resultOff;
--remain;
@@ -403,7 +368,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Returns a byte array of the hash value.
/// Returns a byte array of the hash value.
/// </summary>
public byte[] Final()
{
@@ -412,7 +377,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Returns a base64 representation of the hash value.
/// Returns a base64 representation of the hash value.
/// </summary>
public string End()
{
@@ -422,7 +387,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of a file
/// Gets the hash of a file
/// </summary>
/// <param name="filename">File path.</param>
public static byte[] File(string filename)
@@ -432,7 +397,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of a file in hexadecimal and as a byte array.
/// Gets the hash of a file in hexadecimal and as a byte array.
/// </summary>
/// <param name="filename">File path.</param>
/// <param name="hash">Byte array of the hash value.</param>
@@ -443,7 +408,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of the data buffer to hash.</param>
@@ -462,7 +427,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="hash">null</param>
@@ -486,5 +451,40 @@ namespace DiscImageChef.Checksums
return sb.ToString();
}
struct RollState
{
public byte[] Window;
// ROLLING_WINDOW
public uint H1;
public uint H2;
public uint H3;
public uint N;
}
/* A blockhash contains a signature state for a specific (implicit) blocksize.
* The blocksize is given by SSDEEP_BS(index). The h and halfh members are the
* FNV hashes, where halfh stops to be reset after digest is SPAMSUM_LENGTH/2
* long. The halfh hash is needed be able to truncate digest for the second
* output hash to stay compatible with ssdeep output. */
struct BlockhashContext
{
public uint H;
public uint Halfh;
public byte[] Digest;
// SPAMSUM_LENGTH
public byte Halfdigest;
public uint Dlen;
}
struct FuzzyState
{
public uint Bhstart;
public uint Bhend;
public BlockhashContext[] Bh;
//NUM_BLOCKHASHES
public ulong TotalSize;
public RollState Roll;
}
}
}