aaru-dps/Aaru.Checksums
1
0
Fork 0
mirror of https://github.com/aaru-dps/Aaru.Checksums.git synced 2025-12-16 19:24:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

Code cleanup.

Browse Source
This commit is contained in:
Natalia Portillo
2018-06-22 08:08:38 +01:00
parent d3f24ddefd
commit 7ba01b5076
13 changed files with 116 additions and 94 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
Adler32Context.cs
View File

@@ -81,7 +81,7 @@ namespace DiscImageChef.Checksums
/// </summary> /// </summary>
public byte[] Final() public byte[] Final()
{ {
uint finalSum = (uint)((sum2 << 16) | sum1); uint finalSum = (uint)((sum2 << 16) | sum1);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian; BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
return BigEndianBitConverter.GetBytes(finalSum); return BigEndianBitConverter.GetBytes(finalSum);
} }

10
CRC16Context.cs
View File

@@ -62,7 +62,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ushort entry = (ushort)i; ushort entry = (ushort)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ CRC16_IBM_POLY); entry = (ushort)((entry >> 1) ^ CRC16_IBM_POLY);
else else
@@ -84,7 +84,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ushort entry = (ushort)i; ushort entry = (ushort)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ polynomial); entry = (ushort)((entry >> 1) ^ polynomial);
else else
@@ -130,7 +130,7 @@ namespace DiscImageChef.Checksums
StringBuilder crc16Output = new StringBuilder(); StringBuilder crc16Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian; BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes((ushort)(hashInt ^ finalSeed)).Length; i++) for(int i = 0; i < BigEndianBitConverter.GetBytes((ushort)(hashInt ^ finalSeed)).Length; i++)
crc16Output.Append(BigEndianBitConverter.GetBytes((ushort)(hashInt ^ finalSeed))[i].ToString("x2")); crc16Output.Append(BigEndianBitConverter.GetBytes((ushort)(hashInt ^ finalSeed))[i].ToString("x2"));
return crc16Output.ToString(); return crc16Output.ToString();
@@ -171,7 +171,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ushort entry = (ushort)i; ushort entry = (ushort)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ polynomial); entry = (ushort)((entry >> 1) ^ polynomial);
else else
@@ -224,7 +224,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ushort entry = (ushort)i; ushort entry = (ushort)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ polynomial); entry = (ushort)((entry >> 1) ^ polynomial);
else else

10
CRC32Context.cs
View File

@@ -62,7 +62,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
uint entry = (uint)i; uint entry = (uint)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC32_ISO_POLY; entry = (entry >> 1) ^ CRC32_ISO_POLY;
else else
@@ -84,7 +84,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
uint entry = (uint)i; uint entry = (uint)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else
@@ -130,7 +130,7 @@ namespace DiscImageChef.Checksums
StringBuilder crc32Output = new StringBuilder(); StringBuilder crc32Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian; BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ finalSeed).Length; i++) for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ finalSeed).Length; i++)
crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt ^ finalSeed)[i].ToString("x2")); crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt ^ finalSeed)[i].ToString("x2"));
return crc32Output.ToString(); return crc32Output.ToString();
@@ -171,7 +171,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
uint entry = (uint)i; uint entry = (uint)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else
@@ -223,7 +223,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
uint entry = (uint)i; uint entry = (uint)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else

10
CRC64Context.cs
View File

@@ -44,7 +44,7 @@ namespace DiscImageChef.Checksums
public const ulong CRC64_ECMA_POLY = 0xC96C5795D7870F42; public const ulong CRC64_ECMA_POLY = 0xC96C5795D7870F42;
public const ulong CRC64_ECMA_SEED = 0xFFFFFFFFFFFFFFFF; public const ulong CRC64_ECMA_SEED = 0xFFFFFFFFFFFFFFFF;
readonly ulong finalSeed; readonly ulong finalSeed;
readonly ulong[] table; readonly ulong[] table;
ulong hashInt; ulong hashInt;
@@ -59,7 +59,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ulong entry = (ulong)i; ulong entry = (ulong)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC64_ECMA_POLY; entry = (entry >> 1) ^ CRC64_ECMA_POLY;
else else
@@ -82,7 +82,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ulong entry = (ulong)i; ulong entry = (ulong)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else
@@ -171,7 +171,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ulong entry = (ulong)i; ulong entry = (ulong)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else
@@ -223,7 +223,7 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++) for(int i = 0; i < 256; i++)
{ {
ulong entry = (ulong)i; ulong entry = (ulong)i;
for(int j = 0; j < 8; j++) for(int j = 0; j < 8; j++)
if((entry & 1) == 1) if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial; entry = (entry >> 1) ^ polynomial;
else else

4
FletcherContext.cs
View File

@@ -83,7 +83,7 @@ namespace DiscImageChef.Checksums
/// </summary> /// </summary>
public byte[] Final() public byte[] Final()
{ {
uint finalSum = (uint)((sum2 << 16) | sum1); uint finalSum = (uint)((sum2 << 16) | sum1);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian; BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
return BigEndianBitConverter.GetBytes(finalSum); return BigEndianBitConverter.GetBytes(finalSum);
} }
@@ -230,7 +230,7 @@ namespace DiscImageChef.Checksums
/// </summary> /// </summary>
public byte[] Final() public byte[] Final()
{ {
ushort finalSum = (ushort)((sum2 << 8) | sum1); ushort finalSum = (ushort)((sum2 << 8) | sum1);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian; BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
return BigEndianBitConverter.GetBytes(finalSum); return BigEndianBitConverter.GetBytes(finalSum);
} }

8
MD5Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
MD5 localMd5Provider = MD5.Create(); MD5 localMd5Provider = MD5.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localMd5Provider.ComputeHash(fileStream); hash = localMd5Provider.ComputeHash(fileStream);
StringBuilder md5Output = new StringBuilder(); StringBuilder md5Output = new StringBuilder();
foreach(byte h in hash) md5Output.Append(h.ToString("x2")); foreach(byte h in hash) md5Output.Append(h.ToString("x2"));
@@ -132,8 +132,8 @@ namespace DiscImageChef.Checksums
/// <param name="hash">Byte array of the hash value.</param> /// <param name="hash">Byte array of the hash value.</param>
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
MD5 localMd5Provider = MD5.Create(); MD5 localMd5Provider = MD5.Create();
hash = localMd5Provider.ComputeHash(data, 0, (int)len); hash = localMd5Provider.ComputeHash(data, 0, (int)len);
StringBuilder md5Output = new StringBuilder(); StringBuilder md5Output = new StringBuilder();
foreach(byte h in hash) md5Output.Append(h.ToString("x2")); foreach(byte h in hash) md5Output.Append(h.ToString("x2"));

8
RIPEMD160Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
RIPEMD160 localRipemd160Provider = RIPEMD160.Create(); RIPEMD160 localRipemd160Provider = RIPEMD160.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localRipemd160Provider.ComputeHash(fileStream); hash = localRipemd160Provider.ComputeHash(fileStream);
StringBuilder ripemd160Output = new StringBuilder(); StringBuilder ripemd160Output = new StringBuilder();
foreach(byte h in hash) ripemd160Output.Append(h.ToString("x2")); foreach(byte h in hash) ripemd160Output.Append(h.ToString("x2"));
@@ -133,8 +133,8 @@ namespace DiscImageChef.Checksums
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
RIPEMD160 localRipemd160Provider = RIPEMD160.Create(); RIPEMD160 localRipemd160Provider = RIPEMD160.Create();
hash = localRipemd160Provider.ComputeHash(data, 0, (int)len); hash = localRipemd160Provider.ComputeHash(data, 0, (int)len);
StringBuilder ripemd160Output = new StringBuilder(); StringBuilder ripemd160Output = new StringBuilder();
foreach(byte h in hash) ripemd160Output.Append(h.ToString("x2")); foreach(byte h in hash) ripemd160Output.Append(h.ToString("x2"));

119
ReedSolomon.cs
View File

@@ -88,7 +88,7 @@ namespace DiscImageChef.Checksums
/// </summary> /// </summary>
int[] index_of; int[] index_of;
bool initialized; bool initialized;
int mm, kk, nn; int mm, kk, nn;
/// <summary> /// <summary>
/// Primitive polynomials - see Lin & Costello, Error Control Coding Appendix A, and Lee & Messerschmitt, Digital /// Primitive polynomials - see Lin & Costello, Error Control Coding Appendix A, and Lee & Messerschmitt, Digital
/// Communication p. 453. /// Communication p. 453.
@@ -150,10 +150,10 @@ namespace DiscImageChef.Checksums
default: throw new ArgumentOutOfRangeException(nameof(m), "m must be between 2 and 16 inclusive"); default: throw new ArgumentOutOfRangeException(nameof(m), "m must be between 2 and 16 inclusive");
} }
mm = m; mm = m;
kk = k; kk = k;
nn = n; nn = n;
a0 = n; a0 = n;
alpha_to = new int[n + 1]; alpha_to = new int[n + 1];
index_of = new int[n + 1]; index_of = new int[n + 1];
@@ -170,7 +170,7 @@ namespace DiscImageChef.Checksums
while(x >= nn) while(x >= nn)
{ {
x -= nn; x -= nn;
x = (x >> mm) + (x & nn); x = (x >> mm) + (x & nn);
} }
return x; return x;
@@ -237,11 +237,11 @@ namespace DiscImageChef.Checksums
alpha_to[mm] = 0; alpha_to[mm] = 0;
for(i = 0; i < mm; i++) for(i = 0; i < mm; i++)
{ {
alpha_to[i] = mask; alpha_to[i] = mask;
index_of[alpha_to[i]] = i; index_of[alpha_to[i]] = i;
/* If Pp[i] == 1 then, term @^i occurs in poly-repr of @^MM */ /* If Pp[i] == 1 then, term @^i occurs in poly-repr of @^MM */
if(pp[i] != 0) alpha_to[mm] ^= mask; /* Bit-wise EXOR operation */ if(pp[i] != 0) alpha_to[mm] ^= mask; /* Bit-wise EXOR operation */
mask <<= 1; /* single left-shift */ mask <<= 1; /* single left-shift */
} }
index_of[alpha_to[mm]] = mm; index_of[alpha_to[mm]] = mm;
@@ -254,11 +254,11 @@ namespace DiscImageChef.Checksums
for(i = mm + 1; i < nn; i++) for(i = mm + 1; i < nn; i++)
{ {
if(alpha_to[i - 1] >= mask) alpha_to[i] = alpha_to[mm] ^ ((alpha_to[i - 1] ^ mask) << 1); if(alpha_to[i - 1] >= mask) alpha_to[i] = alpha_to[mm] ^ ((alpha_to[i - 1] ^ mask) << 1);
else alpha_to[i] = alpha_to[i - 1] << 1; else alpha_to[i] = alpha_to[i - 1] << 1;
index_of[alpha_to[i]] = i; index_of[alpha_to[i]] = i;
} }
index_of[0] = a0; index_of[0] = a0;
alpha_to[nn] = 0; alpha_to[nn] = 0;
} }
@@ -289,11 +289,14 @@ namespace DiscImageChef.Checksums
* (@**(B0+i-1) + x) * (@**(B0+i-1) + x)
*/ */
for(int j = i - 1; j > 0; j--) for(int j = i - 1; j > 0; j--)
if(gg[j] != 0) gg[j] = gg[j - 1] ^ alpha_to[Modnn(index_of[gg[j]] + B0 + i - 1)]; if(gg[j] != 0)
else gg[j] = gg[j - 1]; gg[j] = gg[j - 1] ^ alpha_to[Modnn(index_of[gg[j]] + B0 + i - 1)];
else
gg[j] = gg[j - 1];
/* Gg[0] can never be zero */ /* Gg[0] can never be zero */
gg[0] = alpha_to[Modnn(index_of[gg[0]] + B0 + i - 1)]; gg[0] = alpha_to[Modnn(index_of[gg[0]] + B0 + i - 1)];
} }
/* convert Gg[] to index form for quicker encoding */ /* convert Gg[] to index form for quicker encoding */
for(i = 0; i <= nn - kk; i++) gg[i] = index_of[gg[i]]; for(i = 0; i <= nn - kk; i++) gg[i] = index_of[gg[i]];
} }
@@ -322,15 +325,19 @@ namespace DiscImageChef.Checksums
Clear(ref bb, nn - kk); Clear(ref bb, nn - kk);
for(i = kk - 1; i >= 0; i--) for(i = kk - 1; i >= 0; i--)
{ {
if(mm != 8) if(data[i] > nn) return -1; /* Illegal symbol */ if(mm != 8)
if(data[i] > nn)
return -1; /* Illegal symbol */
int feedback = index_of[data[i] ^ bb[nn - kk - 1]]; int feedback = index_of[data[i] ^ bb[nn - kk - 1]];
if(feedback != a0) if(feedback != a0)
{ {
/* feedback term is non-zero */ /* feedback term is non-zero */
for(int j = nn - kk - 1; j > 0; j--) for(int j = nn - kk - 1; j > 0; j--)
if(gg[j] != a0) bb[j] = bb[j - 1] ^ alpha_to[Modnn(gg[j] + feedback)]; if(gg[j] != a0)
else bb[j] = bb[j - 1]; bb[j] = bb[j - 1] ^ alpha_to[Modnn(gg[j] + feedback)];
else
bb[j] = bb[j - 1];
bb[0] = alpha_to[Modnn(gg[0] + feedback)]; bb[0] = alpha_to[Modnn(gg[0] + feedback)];
} }
@@ -372,26 +379,29 @@ namespace DiscImageChef.Checksums
if(!initialized) throw new UnauthorizedAccessException("Trying to calculate RS without initializing!"); if(!initialized) throw new UnauthorizedAccessException("Trying to calculate RS without initializing!");
erasPos = new int[nn - kk]; erasPos = new int[nn - kk];
int i, j; int i, j;
int q, tmp; int q, tmp;
int[] recd = new int[nn]; int[] recd = new int[nn];
int[] lambda = new int[nn - kk + 1]; /* Err+Eras Locator poly */ int[] lambda = new int[nn - kk + 1]; /* Err+Eras Locator poly */
int[] s = new int[nn - kk + 1]; /* syndrome poly */ int[] s = new int[nn - kk + 1]; /* syndrome poly */
int[] b = new int[nn - kk + 1]; int[] b = new int[nn - kk + 1];
int[] t = new int[nn - kk + 1]; int[] t = new int[nn - kk + 1];
int[] omega = new int[nn - kk + 1]; int[] omega = new int[nn - kk + 1];
int[] root = new int[nn - kk]; int[] root = new int[nn - kk];
int[] reg = new int[nn - kk + 1]; int[] reg = new int[nn - kk + 1];
int[] loc = new int[nn - kk]; int[] loc = new int[nn - kk];
int count; int count;
/* data[] is in polynomial form, copy and convert to index form */ /* data[] is in polynomial form, copy and convert to index form */
for(i = nn - 1; i >= 0; i--) for(i = nn - 1; i >= 0; i--)
{ {
if(mm != 8) if(data[i] > nn) return -1; /* Illegal symbol */ if(mm != 8)
if(data[i] > nn)
return -1; /* Illegal symbol */
recd[i] = index_of[data[i]]; recd[i] = index_of[data[i]];
} }
/* first form the syndromes; i.e., evaluate recd(x) at roots of g(x) /* first form the syndromes; i.e., evaluate recd(x) at roots of g(x)
* namely @**(B0+i), i = 0, ... ,(NN-KK-1) * namely @**(B0+i), i = 0, ... ,(NN-KK-1)
*/ */
@@ -400,7 +410,8 @@ namespace DiscImageChef.Checksums
{ {
tmp = 0; tmp = 0;
for(j = 0; j < nn; j++) for(j = 0; j < nn; j++)
if(recd[j] != a0) /* recd[j] in index form */ tmp ^= alpha_to[Modnn(recd[j] + (B0 + i - 1) * j)]; if(recd[j] != a0) /* recd[j] in index form */
tmp ^= alpha_to[Modnn(recd[j] + (B0 + i - 1) * j)];
synError |= tmp; /* set flag if non-zero syndrome => synError |= tmp; /* set flag if non-zero syndrome =>
* error */ * error */
@@ -426,7 +437,7 @@ namespace DiscImageChef.Checksums
} }
} }
#if DEBUG #if DEBUG
/* find roots of the erasure location polynomial */ /* find roots of the erasure location polynomial */
for(i = 1; i <= noEras; i++) reg[i] = index_of[lambda[i]]; for(i = 1; i <= noEras; i++) reg[i] = index_of[lambda[i]];
@@ -437,16 +448,17 @@ namespace DiscImageChef.Checksums
for(j = 1; j <= noEras; j++) for(j = 1; j <= noEras; j++)
if(reg[j] != a0) if(reg[j] != a0)
{ {
reg[j] = Modnn(reg[j] + j); reg[j] = Modnn(reg[j] + j);
q ^= alpha_to[reg[j]]; q ^= alpha_to[reg[j]];
} }
if(q != 0) continue; if(q != 0) continue;
/* store root and error location /* store root and error location
* number indices * number indices
*/ */
root[count] = i; root[count] = i;
loc[count] = nn - i; loc[count] = nn - i;
count++; count++;
} }
@@ -461,7 +473,7 @@ namespace DiscImageChef.Checksums
for(i = 0; i < count; i++) DicConsole.DebugWriteLine("Reed Solomon", "{0} ", loc[i]); for(i = 0; i < count; i++) DicConsole.DebugWriteLine("Reed Solomon", "{0} ", loc[i]);
DicConsole.DebugWriteLine("Reed Solomon", "\n"); DicConsole.DebugWriteLine("Reed Solomon", "\n");
#endif #endif
} }
for(i = 0; i < nn - kk + 1; i++) b[i] = index_of[lambda[i]]; for(i = 0; i < nn - kk + 1; i++) b[i] = index_of[lambda[i]];
@@ -470,7 +482,7 @@ namespace DiscImageChef.Checksums
* Begin Berlekamp-Massey algorithm to determine error+erasure * Begin Berlekamp-Massey algorithm to determine error+erasure
* locator polynomial * locator polynomial
*/ */
int r = noEras; int r = noEras;
int el = noEras; int el = noEras;
while(++r <= nn - kk) while(++r <= nn - kk)
{ {
@@ -478,7 +490,8 @@ namespace DiscImageChef.Checksums
/* Compute discrepancy at the r-th step in poly-form */ /* Compute discrepancy at the r-th step in poly-form */
int discrR = 0; int discrR = 0;
for(i = 0; i < r; i++) for(i = 0; i < r; i++)
if(lambda[i] != 0 && s[r - i] != a0) discrR ^= alpha_to[Modnn(index_of[lambda[i]] + s[r - i])]; if(lambda[i] != 0 && s[r - i] != a0)
discrR ^= alpha_to[Modnn(index_of[lambda[i]] + s[r - i])];
discrR = index_of[discrR]; /* Index form */ discrR = index_of[discrR]; /* Index form */
if(discrR == a0) if(discrR == a0)
@@ -492,8 +505,10 @@ namespace DiscImageChef.Checksums
/* 7 lines below: T(x) <-- lambda(x) - discr_r*x*b(x) */ /* 7 lines below: T(x) <-- lambda(x) - discr_r*x*b(x) */
t[0] = lambda[0]; t[0] = lambda[0];
for(i = 0; i < nn - kk; i++) for(i = 0; i < nn - kk; i++)
if(b[i] != a0) t[i + 1] = lambda[i + 1] ^ alpha_to[Modnn(discrR + b[i])]; if(b[i] != a0)
else t[i + 1] = lambda[i + 1]; t[i + 1] = lambda[i + 1] ^ alpha_to[Modnn(discrR + b[i])];
else
t[i + 1] = lambda[i + 1];
if(2 * el <= r + noEras - 1) if(2 * el <= r + noEras - 1)
{ {
@@ -523,6 +538,7 @@ namespace DiscImageChef.Checksums
lambda[i] = index_of[lambda[i]]; lambda[i] = index_of[lambda[i]];
if(lambda[i] != a0) degLambda = i; if(lambda[i] != a0) degLambda = i;
} }
/* /*
* Find roots of the error+erasure locator polynomial. By Chien * Find roots of the error+erasure locator polynomial. By Chien
* Search * Search
@@ -530,32 +546,34 @@ namespace DiscImageChef.Checksums
int temp = reg[0]; int temp = reg[0];
Copy(ref reg, ref lambda, nn - kk); Copy(ref reg, ref lambda, nn - kk);
reg[0] = temp; reg[0] = temp;
count = 0; /* Number of roots of lambda(x) */ count = 0; /* Number of roots of lambda(x) */
for(i = 1; i <= nn; i++) for(i = 1; i <= nn; i++)
{ {
q = 1; q = 1;
for(j = degLambda; j > 0; j--) for(j = degLambda; j > 0; j--)
if(reg[j] != a0) if(reg[j] != a0)
{ {
reg[j] = Modnn(reg[j] + j); reg[j] = Modnn(reg[j] + j);
q ^= alpha_to[reg[j]]; q ^= alpha_to[reg[j]];
} }
if(q != 0) continue; if(q != 0) continue;
/* store root (index-form) and error location number */ /* store root (index-form) and error location number */
root[count] = i; root[count] = i;
loc[count] = nn - i; loc[count] = nn - i;
count++; count++;
} }
#if DEBUG #if DEBUG
DicConsole.DebugWriteLine("Reed Solomon", "\n Final error positions:\t"); DicConsole.DebugWriteLine("Reed Solomon", "\n Final error positions:\t");
for(i = 0; i < count; i++) DicConsole.DebugWriteLine("Reed Solomon", "{0} ", loc[i]); for(i = 0; i < count; i++) DicConsole.DebugWriteLine("Reed Solomon", "{0} ", loc[i]);
DicConsole.DebugWriteLine("Reed Solomon", "\n"); DicConsole.DebugWriteLine("Reed Solomon", "\n");
#endif #endif
if(degLambda != count) return -1; if(degLambda != count) return -1;
/* /*
* Compute err+eras evaluator poly omega(x) = s(x)*lambda(x) (modulo * Compute err+eras evaluator poly omega(x) = s(x)*lambda(x) (modulo
* x**(NN-KK)). in index form. Also find deg(omega). * x**(NN-KK)). in index form. Also find deg(omega).
@@ -564,9 +582,10 @@ namespace DiscImageChef.Checksums
for(i = 0; i < nn - kk; i++) for(i = 0; i < nn - kk; i++)
{ {
tmp = 0; tmp = 0;
j = degLambda < i ? degLambda : i; j = degLambda < i ? degLambda : i;
for(; j >= 0; j--) for(; j >= 0; j--)
if(s[i + 1 - j] != a0 && lambda[j] != a0) tmp ^= alpha_to[Modnn(s[i + 1 - j] + lambda[j])]; if(s[i + 1 - j] != a0 && lambda[j] != a0)
tmp ^= alpha_to[Modnn(s[i + 1 - j] + lambda[j])];
if(tmp != 0) degOmega = i; if(tmp != 0) degOmega = i;
omega[i] = index_of[tmp]; omega[i] = index_of[tmp];
@@ -581,20 +600,24 @@ namespace DiscImageChef.Checksums
for(j = count - 1; j >= 0; j--) for(j = count - 1; j >= 0; j--)
{ {
int num1 = 0; int num1 = 0;
for(i = degOmega; i >= 0; i--) if(omega[i] != a0) num1 ^= alpha_to[Modnn(omega[i] + i * root[j])]; for(i = degOmega; i >= 0; i--)
if(omega[i] != a0)
num1 ^= alpha_to[Modnn(omega[i] + i * root[j])];
int num2 = alpha_to[Modnn(root[j] * (B0 - 1) + nn)]; int num2 = alpha_to[Modnn(root[j] * (B0 - 1) + nn)];
int den = 0; int den = 0;
/* lambda[i+1] for i even is the formal derivative lambda_pr of lambda[i] */ /* lambda[i+1] for i even is the formal derivative lambda_pr of lambda[i] */
for(i = Min(degLambda, nn - kk - 1) & ~1; i >= 0; i -= 2) for(i = Min(degLambda, nn - kk - 1) & ~1; i >= 0; i -= 2)
if(lambda[i + 1] != a0) den ^= alpha_to[Modnn(lambda[i + 1] + i * root[j])]; if(lambda[i + 1] != a0)
den ^= alpha_to[Modnn(lambda[i + 1] + i * root[j])];
if(den == 0) if(den == 0)
{ {
DicConsole.DebugWriteLine("Reed Solomon", "\n ERROR: denominator = 0\n"); DicConsole.DebugWriteLine("Reed Solomon", "\n ERROR: denominator = 0\n");
return -1; return -1;
} }
/* Apply error to data */ /* Apply error to data */
if(num1 != 0) data[loc[j]] ^= alpha_to[Modnn(index_of[num1] + index_of[num2] + nn - index_of[den])]; if(num1 != 0) data[loc[j]] ^= alpha_to[Modnn(index_of[num1] + index_of[num2] + nn - index_of[den])];
} }

8
SHA1Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
SHA1 localSha1Provider = SHA1.Create(); SHA1 localSha1Provider = SHA1.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localSha1Provider.ComputeHash(fileStream); hash = localSha1Provider.ComputeHash(fileStream);
StringBuilder sha1Output = new StringBuilder(); StringBuilder sha1Output = new StringBuilder();
foreach(byte h in hash) sha1Output.Append(h.ToString("x2")); foreach(byte h in hash) sha1Output.Append(h.ToString("x2"));
@@ -132,8 +132,8 @@ namespace DiscImageChef.Checksums
/// <param name="hash">Byte array of the hash value.</param> /// <param name="hash">Byte array of the hash value.</param>
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
SHA1 localSha1Provider = SHA1.Create(); SHA1 localSha1Provider = SHA1.Create();
hash = localSha1Provider.ComputeHash(data, 0, (int)len); hash = localSha1Provider.ComputeHash(data, 0, (int)len);
StringBuilder sha1Output = new StringBuilder(); StringBuilder sha1Output = new StringBuilder();
foreach(byte h in hash) sha1Output.Append(h.ToString("x2")); foreach(byte h in hash) sha1Output.Append(h.ToString("x2"));

6
SHA256Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
SHA256 localSha256Provider = SHA256.Create(); SHA256 localSha256Provider = SHA256.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localSha256Provider.ComputeHash(fileStream); hash = localSha256Provider.ComputeHash(fileStream);
StringBuilder sha256Output = new StringBuilder(); StringBuilder sha256Output = new StringBuilder();
foreach(byte h in hash) sha256Output.Append(h.ToString("x2")); foreach(byte h in hash) sha256Output.Append(h.ToString("x2"));
@@ -133,7 +133,7 @@ namespace DiscImageChef.Checksums
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
SHA256 localSha256Provider = SHA256.Create(); SHA256 localSha256Provider = SHA256.Create();
hash = localSha256Provider.ComputeHash(data, 0, (int)len); hash = localSha256Provider.ComputeHash(data, 0, (int)len);
StringBuilder sha256Output = new StringBuilder(); StringBuilder sha256Output = new StringBuilder();
foreach(byte h in hash) sha256Output.Append(h.ToString("x2")); foreach(byte h in hash) sha256Output.Append(h.ToString("x2"));

6
SHA384Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
SHA384 localSha384Provider = SHA384.Create(); SHA384 localSha384Provider = SHA384.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localSha384Provider.ComputeHash(fileStream); hash = localSha384Provider.ComputeHash(fileStream);
StringBuilder sha384Output = new StringBuilder(); StringBuilder sha384Output = new StringBuilder();
foreach(byte h in hash) sha384Output.Append(h.ToString("x2")); foreach(byte h in hash) sha384Output.Append(h.ToString("x2"));
@@ -133,7 +133,7 @@ namespace DiscImageChef.Checksums
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
SHA384 localSha384Provider = SHA384.Create(); SHA384 localSha384Provider = SHA384.Create();
hash = localSha384Provider.ComputeHash(data, 0, (int)len); hash = localSha384Provider.ComputeHash(data, 0, (int)len);
StringBuilder sha384Output = new StringBuilder(); StringBuilder sha384Output = new StringBuilder();
foreach(byte h in hash) sha384Output.Append(h.ToString("x2")); foreach(byte h in hash) sha384Output.Append(h.ToString("x2"));

6
SHA512Context.cs
View File

@@ -114,8 +114,8 @@ namespace DiscImageChef.Checksums
{ {
SHA512 localSha512Provider = SHA512.Create(); SHA512 localSha512Provider = SHA512.Create();
FileStream fileStream = new FileStream(filename, FileMode.Open); FileStream fileStream = new FileStream(filename, FileMode.Open);
hash = localSha512Provider.ComputeHash(fileStream); hash = localSha512Provider.ComputeHash(fileStream);
StringBuilder sha512Output = new StringBuilder(); StringBuilder sha512Output = new StringBuilder();
foreach(byte h in hash) sha512Output.Append(h.ToString("x2")); foreach(byte h in hash) sha512Output.Append(h.ToString("x2"));
@@ -133,7 +133,7 @@ namespace DiscImageChef.Checksums
public static string Data(byte[] data, uint len, out byte[] hash) public static string Data(byte[] data, uint len, out byte[] hash)
{ {
SHA512 localSha512Provider = SHA512.Create(); SHA512 localSha512Provider = SHA512.Create();
hash = localSha512Provider.ComputeHash(data, 0, (int)len); hash = localSha512Provider.ComputeHash(data, 0, (int)len);
StringBuilder sha512Output = new StringBuilder(); StringBuilder sha512Output = new StringBuilder();
foreach(byte h in hash) sha512Output.Append(h.ToString("x2")); foreach(byte h in hash) sha512Output.Append(h.ToString("x2"));

13
SpamSumContext.cs
View File

@@ -72,8 +72,7 @@ namespace DiscImageChef.Checksums
/// </summary> /// </summary>
public SpamSumContext() public SpamSumContext()
{ {
self = self = new FuzzyState {Bh = new BlockhashContext[NUM_BLOCKHASHES]};
new FuzzyState {Bh = new BlockhashContext[NUM_BLOCKHASHES]};
for(int i = 0; i < NUM_BLOCKHASHES; i++) self.Bh[i].Digest = new byte[SPAMSUM_LENGTH]; for(int i = 0; i < NUM_BLOCKHASHES; i++) self.Bh[i].Digest = new byte[SPAMSUM_LENGTH];
self.Bhstart = 0; self.Bhstart = 0;
@@ -211,7 +210,7 @@ namespace DiscImageChef.Checksums
void fuzzy_engine_step(byte c) void fuzzy_engine_step(byte c)
{ {
uint i; uint i;
/* At each character we update the rolling hash and the normal hashes. /* At each character we update the rolling hash and the normal hashes.
* When the rolling hash hits a reset value then we emit a normal hash * When the rolling hash hits a reset value then we emit a normal hash
* as a element of the signature and reset the normal hash. */ * as a element of the signature and reset the normal hash. */
@@ -260,11 +259,11 @@ namespace DiscImageChef.Checksums
// CLAUNIA: Flags seems to never be used in ssdeep, so I just removed it for code simplicity // CLAUNIA: Flags seems to never be used in ssdeep, so I just removed it for code simplicity
uint FuzzyDigest(out byte[] result) uint FuzzyDigest(out byte[] result)
{ {
StringBuilder sb = new StringBuilder(); StringBuilder sb = new StringBuilder();
uint bi = self.Bhstart; uint bi = self.Bhstart;
uint h = roll_sum(); uint h = roll_sum();
int remain = (int)(FUZZY_MAX_RESULT - 1); /* Exclude terminating '\0'. */ int remain = (int)(FUZZY_MAX_RESULT - 1); /* Exclude terminating '\0'. */
result = new byte[FUZZY_MAX_RESULT]; result = new byte[FUZZY_MAX_RESULT];
/* Verify that our elimination was not overeager. */ /* Verify that our elimination was not overeager. */
if(!(bi == 0 || (ulong)SSDEEP_BS(bi) / 2 * SPAMSUM_LENGTH < self.TotalSize)) if(!(bi == 0 || (ulong)SSDEEP_BS(bi) / 2 * SPAMSUM_LENGTH < self.TotalSize))
throw new Exception("Assertion failed"); throw new Exception("Assertion failed");