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Corrected checksum calculation errors.

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This commit is contained in:
Natalia Portillo
2017-06-29 22:30:03 +01:00
parent 08cbe92709
commit 4620115967
5 changed files with 23 additions and 14 deletions
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15
DiscImageChef.Checksums/Adler32Context.cs
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@@ -79,6 +79,7 @@ namespace DiscImageChef.Checksums
public byte[] Final()
{
uint finalSum = (uint)((sum2 << 16) | sum1);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
return BigEndianBitConverter.GetBytes(finalSum);
}
@@ -90,6 +91,7 @@ namespace DiscImageChef.Checksums
uint finalSum = (uint)((sum2 << 16) | sum1);
StringBuilder adlerOutput = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
{
adlerOutput.Append(BigEndianBitConverter.GetBytes(finalSum)[i].ToString("x2"));
@@ -123,12 +125,16 @@ namespace DiscImageChef.Checksums
localSum1 = 1;
localSum2 = 0;
localSum1 = (ushort)((localSum1 + fileStream.ReadByte()) % AdlerModule);
localSum2 = (ushort)((localSum2 + localSum1) % AdlerModule);
for(int i = 0; i < fileStream.Length; i++)
{
localSum1 = (ushort)((localSum1 + fileStream.ReadByte()) % AdlerModule);
localSum2 = (ushort)((localSum2 + localSum1) % AdlerModule);
}
finalSum = (uint)((localSum2 << 16) | localSum1);
hash = BitConverter.GetBytes(finalSum);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(finalSum);
StringBuilder adlerOutput = new StringBuilder();
@@ -164,7 +170,8 @@ namespace DiscImageChef.Checksums
finalSum = (uint)((localSum2 << 16) | localSum1);
hash = BitConverter.GetBytes(finalSum);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(finalSum);
StringBuilder adlerOutput = new StringBuilder();

6
DiscImageChef.Checksums/CRC32Context.cs
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@@ -153,8 +153,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < fileStream.Length; i++)
localhashInt = (localhashInt >> 8) ^ localTable[fileStream.ReadByte() ^ localhashInt & 0xff];
localhashInt ^= crc32Seed;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();
@@ -209,8 +210,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ localhashInt & 0xff];
localhashInt ^= crc32Seed;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();

6
DiscImageChef.Checksums/CRC64Context.cs
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@@ -153,8 +153,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < fileStream.Length; i++)
localhashInt = (localhashInt >> 8) ^ localTable[(ulong)fileStream.ReadByte() ^ localhashInt & 0xffL];
localhashInt ^= crc64Seed;
BigEndianBitConverter.IsLittleEndian = BigEndianBitConverter.IsLittleEndian;
hash = BitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc64Output = new StringBuilder();
@@ -209,8 +210,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ localhashInt & 0xff];
localhashInt ^= crc64Seed;
BigEndianBitConverter.IsLittleEndian = BigEndianBitConverter.IsLittleEndian;
hash = BitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc64Output = new StringBuilder();

6
DiscImageChef.Checksums/SpamSumContext.cs
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@@ -491,12 +491,10 @@ namespace DiscImageChef.Checksums
fuzzyContext.Init();
fuzzyContext.Update(data, len);
hash = null;
byte[] result;
fuzzy_digest(out result);
return CToString(result);
return fuzzyContext.End();
}
/// <summary>

4
DiscImageChef.Tests/Checksums/SpamSum.cs
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@@ -86,7 +86,7 @@ namespace DiscImageChef.Tests.Checksums
fs.Dispose();
SpamSumContext ctx = new SpamSumContext();
string result = ctx.Data(data, out byte[] tmp);
Assert.AreEqual(ExpectedEmpty, result);
Assert.AreEqual(ExpectedRandom, result);
}
[Test]
@@ -101,7 +101,7 @@ namespace DiscImageChef.Tests.Checksums
ctx.Init();
ctx.Update(data);
string result = ctx.End();
Assert.AreEqual(ExpectedEmpty, result);
Assert.AreEqual(ExpectedRandom, result);
}
}
}