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Corrected poly, solved endian problem

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Natalia Portillo
2015-02-02 17:40:02 +00:00
parent a817acbe4d
commit 0d7c2ce12b
2 changed files with 14 additions and 5 deletions
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5
DiscImageChef/ChangeLog
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@@ -1,3 +1,8 @@
2015-02-02 Natalia Portillo <claunia@claunia.com>
* Checksums/CRC16Context.cs:
Corrected poly, solved endian problem
2014-04-21 Natalia Portillo <claunia@claunia.com>
* ImagePlugins/TeleDisk.cs:

14
DiscImageChef/Checksums/CRC16Context.cs
View File

@@ -46,8 +46,8 @@ namespace DiscImageChef.Checksums
/// </summary>
public class CRC16Context
{
const UInt16 crc16Poly = 0x8408;
const UInt16 crc16Seed = 0xFFFF;
const UInt16 crc16Poly = 0xA001;
const UInt16 crc16Seed = 0x0000;
UInt16[] table;
UInt16 hashInt;
@@ -80,7 +80,7 @@ namespace DiscImageChef.Checksums
public void Update(byte[] data, uint len)
{
for (int i = 0; i < len; i++)
hashInt = (ushort)((hashInt >> 8) ^ table[data[i] ^ hashInt & 0xff]);
hashInt = (ushort)((hashInt >> 8) ^ table[data[i] ^ (hashInt & 0xFF)]);
}
/// <summary>
@@ -98,6 +98,7 @@ namespace DiscImageChef.Checksums
public byte[] Final()
{
hashInt ^= crc16Seed;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
return BigEndianBitConverter.GetBytes(hashInt);
}
@@ -109,6 +110,7 @@ namespace DiscImageChef.Checksums
hashInt ^= crc16Seed;
StringBuilder crc16Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for (int i = 0; i < BigEndianBitConverter.GetBytes(hashInt).Length; i++)
{
crc16Output.Append(BigEndianBitConverter.GetBytes(hashInt)[i].ToString("x2"));
@@ -156,7 +158,8 @@ namespace DiscImageChef.Checksums
for (int i = 0; i < fileStream.Length; i++)
localhashInt = (ushort)((localhashInt >> 8) ^ localTable[fileStream.ReadByte() ^ localhashInt & 0xff]);
hash = BitConverter.GetBytes(localhashInt);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc16Output = new StringBuilder();
@@ -209,7 +212,8 @@ namespace DiscImageChef.Checksums
for (int i = 0; i < len; i++)
localhashInt = (ushort)((localhashInt >> 8) ^ localTable[data[i] ^ localhashInt & 0xff]);
hash = BitConverter.GetBytes(localhashInt);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc16Output = new StringBuilder();