SMBServer v1.0.5

2025-07-25 10:28:15 +02:00 · 2016-12-22 20:51:16 +02:00 · 2016-12-22 20:51:16 +02:00 · bd1006cb81
commit bd1006cb81
parent b75820452d
400 changed files with 28062 additions and 0 deletions
--- a/Utilities/Cryptography/CRC32.cs
+++ b/Utilities/Cryptography/CRC32.cs
@ -0,0 +1,120 @@
+using System;
+using System.Security.Cryptography;
+
+namespace Utilities
+{
+    // Author: Damien Guard (damieng@gmail.com)
+    // http://damieng.com/blog/2006/08/08/calculating_crc32_in_c_and_net
+    public class CRC32 : HashAlgorithm
+    {
+        public const UInt32 DefaultPolynomial = 0xedb88320;
+        public const UInt32 DefaultSeed = 0xffffffff;
+
+        private UInt32 hash;
+        private UInt32 seed;
+        private UInt32[] table;
+        private static UInt32[] defaultTable;
+
+        public CRC32()
+        {
+            table = InitializeTable(DefaultPolynomial);
+            seed = DefaultSeed;
+            Initialize();
+        }
+
+        public CRC32(UInt32 polynomial, UInt32 seed)
+        {
+            table = InitializeTable(polynomial);
+            this.seed = seed;
+            Initialize();
+        }
+
+        public override void Initialize()
+        {
+            hash = seed;
+        }
+
+        protected override void HashCore(byte[] buffer, int start, int length)
+        {
+            hash = CalculateHash(table, hash, buffer, start, length);
+        }
+
+        protected override byte[] HashFinal()
+        {
+            byte[] hashBuffer = UInt32ToBigEndianBytes(~hash);
+            this.HashValue = hashBuffer;
+            return hashBuffer;
+        }
+
+        public override int HashSize
+        {
+            get { return 32; }
+        }
+
+        public static UInt32 Compute(byte[] buffer)
+        {
+            return ~CalculateHash(InitializeTable(DefaultPolynomial), DefaultSeed, buffer, 0, buffer.Length);
+        }
+
+        public static UInt32 Compute(UInt32 seed, byte[] buffer)
+        {
+            return ~CalculateHash(InitializeTable(DefaultPolynomial), seed, buffer, 0, buffer.Length);
+        }
+
+        public static UInt32 Compute(UInt32 polynomial, UInt32 seed, byte[] buffer)
+        {
+            return ~CalculateHash(InitializeTable(polynomial), seed, buffer, 0, buffer.Length);
+        }
+
+        private static UInt32[] InitializeTable(UInt32 polynomial)
+        {
+            if (polynomial == DefaultPolynomial && defaultTable != null)
+                return defaultTable;
+
+            UInt32[] createTable = new UInt32[256];
+            for (int i = 0; i < 256; i++)
+            {
+                UInt32 entry = (UInt32)i;
+                for (int j = 0; j < 8; j++)
+                    if ((entry & 1) == 1)
+                        entry = (entry >> 1) ^ polynomial;
+                    else
+                        entry = entry >> 1;
+                createTable[i] = entry;
+            }
+
+            if (polynomial == DefaultPolynomial)
+                defaultTable = createTable;
+
+            return createTable;
+        }
+
+        private static UInt32 CalculateHash(UInt32[] table, UInt32 seed, byte[] buffer, int start, int size)
+        {
+            UInt32 crc = seed;
+            for (int i = start; i < size; i++)
+                unchecked
+                {
+                    crc = (crc >> 8) ^ table[buffer[i] ^ crc & 0xff];
+                }
+            return crc;
+        }
+
+        private byte[] UInt32ToBigEndianBytes(UInt32 x)
+        {
+            return new byte[] {
+			    (byte)((x >> 24) & 0xff),
+			    (byte)((x >> 16) & 0xff),
+			    (byte)((x >> 8) & 0xff),
+			    (byte)(x & 0xff)
+		    };
+        }
+
+        // Added by Tal Aloni 2013.07.11
+        public static uint UPDC32(byte octet, uint crc)
+        {
+            uint[] table = InitializeTable(DefaultPolynomial);
+            return (table[((crc) ^ ((byte)octet)) & 0xff] ^ ((crc) >> 8));
+        }
+    }
+}