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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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54
DiscImageChef.Checksums/CRC32Context.cs
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@@ -43,14 +43,14 @@ namespace DiscImageChef.Checksums
{
const uint CRC32_POLY = 0xEDB88320;
const uint CRC32_SEED = 0xFFFFFFFF;
uint hashInt;
uint[] table;
readonly uint[] table;
uint hashInt;
/// <summary>
/// Initializes the CRC32 table and seed
/// </summary>
public void Init()
public Crc32Context()
{
hashInt = CRC32_SEED;
@@ -58,9 +58,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
uint entry = (uint)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (entry >> 1) ^ CRC32_POLY;
else entry = entry >> 1;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC32_POLY;
else
entry = entry >> 1;
table[i] = entry;
}
@@ -102,7 +104,7 @@ namespace DiscImageChef.Checksums
StringBuilder crc32Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ CRC32_SEED).Length; i++)
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ CRC32_SEED).Length; i++)
crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt ^ CRC32_SEED)[i].ToString("x2"));
return crc32Output.ToString();
@@ -126,7 +128,7 @@ namespace DiscImageChef.Checksums
public static string File(string filename, out byte[] hash)
{
FileStream fileStream = new FileStream(filename, FileMode.Open);
uint localhashInt;
uint localhashInt;
localhashInt = CRC32_SEED;
@@ -134,25 +136,27 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
uint entry = (uint)i;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1) entry = (entry >> 1) ^ CRC32_POLY;
else entry = entry >> 1;
for(int j = 0; j < 8; j++)
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC32_POLY;
else
entry = entry >> 1;
localTable[i] = entry;
}
for(int i = 0; i < fileStream.Length; i++)
{
localhashInt = (localhashInt >> 8) ^ localTable[fileStream.ReadByte() ^ (localhashInt & 0xff)];
if((localhashInt ^ CRC32_SEED) == 0xB883C628 || (localhashInt ^CRC32_SEED) == 0x28C683B8)
{
localhashInt = (localhashInt >> 8) ^
localTable[fileStream.ReadByte() ^ (localhashInt & 0xff)];
if((localhashInt ^ CRC32_SEED) == 0xB883C628 ||
(localhashInt ^ CRC32_SEED) == 0x28C683B8)
System.Console.WriteLine("CRC found at position {0}", fileStream.Position);
}
}
localhashInt ^= CRC32_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localhashInt ^= CRC32_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();
@@ -192,9 +196,11 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < 256; i++)
{
uint entry = (uint)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;
}
@@ -202,9 +208,9 @@ namespace DiscImageChef.Checksums
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)];
localhashInt ^= CRC32_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localhashInt ^= CRC32_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();