scripts

ICSharpCode.SharpZipLib/Checksums/Adler32.cs

@@ -0,0 +1,100 @@
+using System;
+
+namespace ICSharpCode.SharpZipLib.Checksums
+{
+	// Token: 0x0200000A RID: 10
+	public sealed class Adler32 : IChecksum
+	{
+		// Token: 0x1700000F RID: 15
+		// (get) Token: 0x0600006D RID: 109 RVA: 0x000060C1 File Offset: 0x000050C1
+		public long Value
+		{
+			get
+			{
+				return (long)((ulong)this.checksum);
+			}
+		}
+
+		// Token: 0x0600006E RID: 110 RVA: 0x000060CA File Offset: 0x000050CA
+		public Adler32()
+		{
+			this.Reset();
+		}
+
+		// Token: 0x0600006F RID: 111 RVA: 0x000060D8 File Offset: 0x000050D8
+		public void Reset()
+		{
+			this.checksum = 1U;
+		}
+
+		// Token: 0x06000070 RID: 112 RVA: 0x000060E4 File Offset: 0x000050E4
+		public void Update(int value)
+		{
+			uint num = this.checksum & 65535U;
+			uint num2 = this.checksum >> 16;
+			num = (num + (uint)(value & 255)) % 65521U;
+			num2 = (num + num2) % 65521U;
+			this.checksum = (num2 << 16) + num;
+		}
+
+		// Token: 0x06000071 RID: 113 RVA: 0x0000612E File Offset: 0x0000512E
+		public void Update(byte[] buffer)
+		{
+			if (buffer == null)
+			{
+				throw new ArgumentNullException("buffer");
+			}
+			this.Update(buffer, 0, buffer.Length);
+		}
+
+		// Token: 0x06000072 RID: 114 RVA: 0x0000614C File Offset: 0x0000514C
+		public void Update(byte[] buffer, int offset, int count)
+		{
+			if (buffer == null)
+			{
+				throw new ArgumentNullException("buffer");
+			}
+			if (offset < 0)
+			{
+				throw new ArgumentOutOfRangeException("offset", "cannot be negative");
+			}
+			if (count < 0)
+			{
+				throw new ArgumentOutOfRangeException("count", "cannot be negative");
+			}
+			if (offset >= buffer.Length)
+			{
+				throw new ArgumentOutOfRangeException("offset", "not a valid index into buffer");
+			}
+			if (offset + count > buffer.Length)
+			{
+				throw new ArgumentOutOfRangeException("count", "exceeds buffer size");
+			}
+			uint num = this.checksum & 65535U;
+			uint num2 = this.checksum >> 16;
+			while (count > 0)
+			{
+				int num3 = 3800;
+				if (num3 > count)
+				{
+					num3 = count;
+				}
+				count -= num3;
+				while (--num3 >= 0)
+				{
+					num += (uint)(buffer[offset++] & byte.MaxValue);
+					num2 += num;
+				}
+				num %= 65521U;
+				num2 %= 65521U;
+			}
+			this.checksum = (num2 << 16) | num;
+		}
+
+		// Token: 0x04000066 RID: 102
+		private const uint BASE = 65521U;
+
+		// Token: 0x04000067 RID: 103
+		private uint checksum;
+	}
+}