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Corrected Fletcher code

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Natalia Portillo
2015-02-02 16:43:01 +00:00
parent 6ba2ebdd98
commit a963ef44d6
1 changed files with 3 additions and 5 deletions
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8
SharpHash/Checksums/FletcherContext.cs
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@@ -178,7 +178,7 @@ namespace SharpHash.Checksums
for (int i = 0; i < fileStream.Length; i+=2) for (int i = 0; i < fileStream.Length; i+=2)
{ {
blockBytes = new byte[2]; blockBytes = new byte[2];
fileStream.Read(blockBytes, i, 2); fileStream.Read(blockBytes, 0, 2);
block = BigEndianBitConverter.ToUInt16(blockBytes, 0); block = BigEndianBitConverter.ToUInt16(blockBytes, 0);
localSum1 = (UInt16)((localSum1 + block) % 0xFFFF); localSum1 = (UInt16)((localSum1 + block) % 0xFFFF);
localSum2 = (UInt16)((localSum2 + localSum1) % 0xFFFF); localSum2 = (UInt16)((localSum2 + localSum1) % 0xFFFF);
@@ -189,16 +189,14 @@ namespace SharpHash.Checksums
for (int i = 0; i < fileStream.Length-1; i+=2) for (int i = 0; i < fileStream.Length-1; i+=2)
{ {
blockBytes = new byte[2]; blockBytes = new byte[2];
fileStream.Read(blockBytes, i, 2); fileStream.Read(blockBytes, 0, 2);
block = BigEndianBitConverter.ToUInt16(blockBytes, 0); block = BigEndianBitConverter.ToUInt16(blockBytes, 0);
localSum1 = (UInt16)((localSum1 + block) % 0xFFFF); localSum1 = (UInt16)((localSum1 + block) % 0xFFFF);
localSum2 = (UInt16)((localSum2 + localSum1) % 0xFFFF); localSum2 = (UInt16)((localSum2 + localSum1) % 0xFFFF);
} }
byte[] oddData = new byte[2]; byte[] oddData = new byte[2];
blockBytes = new byte[1]; oddData[0] = (byte)fileStream.ReadByte();
fileStream.Read(blockBytes, (int)(fileStream.Length-2), 1);
oddData[0] = blockBytes[0];
oddData[1] = 0; oddData[1] = 0;
block = BigEndianBitConverter.ToUInt16(oddData, 0); block = BigEndianBitConverter.ToUInt16(oddData, 0);