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REFACTOR: Final cleanup of DiscImageChef.Checksums.

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This commit is contained in:
Natalia Portillo
2017-12-23 16:40:14 +00:00
parent d4bfbf2cae
commit bb0b845da8
13 changed files with 251 additions and 232 deletions
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32
DiscImageChef.Checksums/CRC32Context.cs
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@@ -37,18 +37,18 @@ using System.Text;
namespace DiscImageChef.Checksums
{
/// <summary>
/// Implements a CRC32 algorithm
/// Implements a CRC32 algorithm
/// </summary>
public class Crc32Context
{
const uint CRC32_POLY = 0xEDB88320;
const uint CRC32_SEED = 0xFFFFFFFF;
uint[] table;
uint hashInt;
uint[] table;
/// <summary>
/// Initializes the CRC32 table and seed
/// Initializes the CRC32 table and seed
/// </summary>
public void Init()
{
@@ -67,7 +67,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Updates the hash with data.
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of buffer to hash.</param>
@@ -77,7 +77,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Updates the hash with data.
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
public void Update(byte[] data)
@@ -86,7 +86,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Returns a byte array of the hash value.
/// Returns a byte array of the hash value.
/// </summary>
public byte[] Final()
{
@@ -96,7 +96,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Returns a hexadecimal representation of the hash value.
/// Returns a hexadecimal representation of the hash value.
/// </summary>
public string End()
{
@@ -104,13 +104,14 @@ namespace DiscImageChef.Checksums
StringBuilder crc32Output = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt).Length; i++) crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt)[i].ToString("x2"));
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt).Length; i++)
crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt)[i].ToString("x2"));
return crc32Output.ToString();
}
/// <summary>
/// Gets the hash of a file
/// Gets the hash of a file
/// </summary>
/// <param name="filename">File path.</param>
public static byte[] File(string filename)
@@ -120,7 +121,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of a file in hexadecimal and as a byte array.
/// Gets the hash of a file in hexadecimal and as a byte array.
/// </summary>
/// <param name="filename">File path.</param>
/// <param name="hash">Byte array of the hash value.</param>
@@ -159,7 +160,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of the data buffer to hash.</param>
@@ -170,7 +171,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of the data buffer to hash.</param>
@@ -194,7 +195,8 @@ namespace DiscImageChef.Checksums
localTable[i] = entry;
}
for(int i = 0; i < len; i++) localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)];
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)];
localhashInt ^= CRC32_SEED;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
@@ -208,7 +210,7 @@ namespace DiscImageChef.Checksums
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="hash">Byte array of the hash value.</param>