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🐛Move checksum initializers to instance constructors.

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This commit is contained in:
Natalia Portillo
2018-02-03 17:39:49 +00:00
parent 4b4671b4ef
commit b50b6c29ca
61 changed files with 1429 additions and 1599 deletions
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38
DiscImageChef.Checksums/CRC16Context.cs
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@@ -43,14 +43,14 @@ namespace DiscImageChef.Checksums
{
const ushort CRC16_POLY = 0xA001;
const ushort CRC16_SEED = 0x0000;
ushort hashInt;
ushort[] table;
readonly ushort[] table;
ushort hashInt;
/// <summary>
/// Initializes the CRC16 table and seed
/// </summary>
public void Init()
public Crc16Context()
{
hashInt = CRC16_SEED;
@@ -58,9 +58,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ushort entry = (ushort)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (ushort)((entry >> 1) ^ CRC16_POLY);
else entry = (ushort)(entry >> 1);
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ CRC16_POLY);
else
entry = (ushort)(entry >> 1);
table[i] = entry;
}
@@ -102,7 +104,7 @@ namespace DiscImageChef.Checksums
StringBuilder crc16Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ CRC16_SEED).Length; i++)
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ CRC16_SEED).Length; i++)
crc16Output.Append(BigEndianBitConverter.GetBytes(hashInt ^ CRC16_SEED)[i].ToString("x2"));
return crc16Output.ToString();
@@ -126,7 +128,7 @@ namespace DiscImageChef.Checksums
public static string File(string filename, out byte[] hash)
{
FileStream fileStream = new FileStream(filename, FileMode.Open);
ushort localhashInt;
ushort localhashInt;
localhashInt = CRC16_SEED;
@@ -134,9 +136,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ushort entry = (ushort)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (ushort)((entry >> 1) ^ CRC16_POLY);
else entry = (ushort)(entry >> 1);
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ CRC16_POLY);
else
entry = (ushort)(entry >> 1);
localTable[i] = entry;
}
@@ -146,7 +150,7 @@ namespace DiscImageChef.Checksums
(ushort)((localhashInt >> 8) ^ localTable[fileStream.ReadByte() ^ (localhashInt & 0xff)]);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc16Output = new StringBuilder();
@@ -186,9 +190,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ushort entry = (ushort)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (ushort)((entry >> 1) ^ polynomial);
else entry = (ushort)(entry >> 1);
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (ushort)((entry >> 1) ^ polynomial);
else
entry = (ushort)(entry >> 1);
localTable[i] = entry;
}
@@ -197,7 +203,7 @@ namespace DiscImageChef.Checksums
localhashInt = (ushort)((localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)]);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc16Output = new StringBuilder();