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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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44
DiscImageChef.Checksums/CRC64Context.cs
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@@ -43,14 +43,14 @@ namespace DiscImageChef.Checksums
{
const ulong CRC64_POLY = 0xC96C5795D7870F42;
const ulong CRC64_SEED = 0xFFFFFFFFFFFFFFFF;
ulong hashInt;
ulong[] table;
readonly ulong[] table;
ulong hashInt;
/// <summary>
/// Initializes the CRC64 table and seed
/// </summary>
public void Init()
public Crc64Context()
{
hashInt = CRC64_SEED;
@@ -58,9 +58,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ulong entry = (ulong)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (entry >> 1) ^ CRC64_POLY;
else entry = entry >> 1;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC64_POLY;
else
entry = entry >> 1;
table[i] = entry;
}
@@ -126,7 +128,7 @@ namespace DiscImageChef.Checksums
public static string File(string filename, out byte[] hash)
{
FileStream fileStream = new FileStream(filename, FileMode.Open);
ulong localhashInt;
ulong localhashInt;
localhashInt = CRC64_SEED;
@@ -134,9 +136,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ulong entry = (ulong)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (entry >> 1) ^ CRC64_POLY;
else entry = entry >> 1;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC64_POLY;
else
entry = entry >> 1;
localTable[i] = entry;
}
@@ -144,9 +148,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < fileStream.Length; i++)
localhashInt = (localhashInt >> 8) ^ localTable[(ulong)fileStream.ReadByte() ^ (localhashInt & 0xffL)];
localhashInt ^= CRC64_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localhashInt ^= CRC64_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc64Output = new StringBuilder();
@@ -186,9 +190,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
ulong entry = (ulong)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (entry >> 1) ^ polynomial;
else entry = entry >> 1;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
localTable[i] = entry;
}
@@ -196,9 +202,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)];
localhashInt ^= CRC64_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localhashInt ^= CRC64_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc64Output = new StringBuilder();