aaru-dps/Aaru.Checksums
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Code restyling.

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This commit is contained in:
Natalia Portillo
2020-02-29 18:03:33 +00:00
parent 2d5bc1f8ed
commit 5f2ddad918
15 changed files with 690 additions and 739 deletions
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107
CRC32Context.cs
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@@ -36,9 +36,7 @@ using Aaru.CommonTypes.Interfaces;
namespace Aaru.Checksums
{
/// <summary>
/// Implements a CRC32 algorithm
/// </summary>
/// <summary>Implements a CRC32 algorithm</summary>
public class Crc32Context : IChecksum
{
const uint CRC32_ISO_POLY = 0xEDB88320;
@@ -50,76 +48,70 @@ namespace Aaru.Checksums
readonly uint[] table;
uint hashInt;
/// <summary>
/// Initializes the CRC32 table and seed as CRC32-ISO
/// </summary>
/// <summary>Initializes the CRC32 table and seed as CRC32-ISO</summary>
public Crc32Context()
{
hashInt = CRC32_ISO_SEED;
finalSeed = CRC32_ISO_SEED;
table = new uint[256];
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_ISO_POLY;
else entry = entry >> 1;
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC32_ISO_POLY;
else
entry = entry >> 1;
table[i] = entry;
}
}
/// <summary>
/// Initializes the CRC32 table with a custom polynomial and seed
/// </summary>
/// <summary>Initializes the CRC32 table with a custom polynomial and seed</summary>
public Crc32Context(uint polynomial, uint seed)
{
hashInt = seed;
finalSeed = seed;
table = new uint[256];
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;
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
table[i] = entry;
}
}
/// <summary>
/// Updates the hash with data.
/// </summary>
/// <summary>Updates the hash with data.</summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of buffer to hash.</param>
public void Update(byte[] data, uint len)
{
for(int i = 0; i < len; i++) hashInt = (hashInt >> 8) ^ table[data[i] ^ (hashInt & 0xff)];
for(int i = 0; i < len; i++)
hashInt = (hashInt >> 8) ^ table[data[i] ^ (hashInt & 0xff)];
}
/// <summary>
/// Updates the hash with data.
/// </summary>
/// <summary>Updates the hash with data.</summary>
/// <param name="data">Data buffer.</param>
public void Update(byte[] data)
{
Update(data, (uint)data.Length);
}
public void Update(byte[] data) => Update(data, (uint)data.Length);
/// <summary>
/// Returns a byte array of the hash value.
/// </summary>
/// <summary>Returns a byte array of the hash value.</summary>
public byte[] Final() => BigEndianBitConverter.GetBytes(hashInt ^ finalSeed);
/// <summary>
/// Returns a hexadecimal representation of the hash value.
/// </summary>
/// <summary>Returns a hexadecimal representation of the hash value.</summary>
public string End()
{
StringBuilder crc32Output = new StringBuilder();
var crc32Output = new StringBuilder();
for(int i = 0; i < BigEndianBitConverter.GetBytes(hashInt ^ finalSeed).Length; i++)
crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt ^ finalSeed)[i].ToString("x2"));
@@ -127,42 +119,41 @@ namespace Aaru.Checksums
return crc32Output.ToString();
}
/// <summary>
/// Gets the hash of a file
/// </summary>
/// <summary>Gets the hash of a file</summary>
/// <param name="filename">File path.</param>
public static byte[] File(string filename)
{
File(filename, out byte[] hash);
return hash;
}
/// <summary>
/// Gets the hash of a file in hexadecimal and as a byte array.
/// </summary>
/// <summary>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>
public static string File(string filename, out byte[] hash) =>
File(filename, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
/// <summary>
/// Gets the hash of a file in hexadecimal and as a byte array.
/// </summary>
/// <summary>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>
public static string File(string filename, out byte[] hash, uint polynomial, uint seed)
{
FileStream fileStream = new FileStream(filename, FileMode.Open);
var fileStream = new FileStream(filename, FileMode.Open);
uint localhashInt = seed;
uint[] localTable = new uint[256];
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;
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
localTable[i] = entry;
}
@@ -173,27 +164,24 @@ namespace Aaru.Checksums
localhashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();
var crc32Output = new StringBuilder();
foreach(byte h in hash) crc32Output.Append(h.ToString("x2"));
foreach(byte h in hash)
crc32Output.Append(h.ToString("x2"));
fileStream.Close();
return crc32Output.ToString();
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// </summary>
/// <summary>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>
/// <param name="hash">Byte array of the hash value.</param>
public static string Data(byte[] data, uint len, out byte[] hash) =>
Data(data, len, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
/// <summary>
/// Gets the hash of the specified data buffer.
/// </summary>
/// <summary>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>
/// <param name="hash">Byte array of the hash value.</param>
@@ -204,12 +192,16 @@ namespace Aaru.Checksums
uint localhashInt = seed;
uint[] localTable = new uint[256];
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;
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
localTable[i] = entry;
}
@@ -220,16 +212,15 @@ namespace Aaru.Checksums
localhashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localhashInt);
StringBuilder crc32Output = new StringBuilder();
var crc32Output = new StringBuilder();
foreach(byte h in hash) crc32Output.Append(h.ToString("x2"));
foreach(byte h in hash)
crc32Output.Append(h.ToString("x2"));
return crc32Output.ToString();
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// </summary>
/// <summary>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>
public static string Data(byte[] data, out byte[] hash) => Data(data, (uint)data.Length, out hash);