using System;

namespace Hjg.Pngcs.Zlib
{
	// Token: 0x02000040 RID: 64
	public class Adler32
	{
		// Token: 0x06000277 RID: 631 RVA: 0x0000A600 File Offset: 0x00008800
		public void Update(byte data)
		{
			if (this.pend >= 5550)
			{
				this.updateModulus();
			}
			this.a += (uint)data;
			this.b += this.a;
			this.pend++;
		}

		// Token: 0x06000278 RID: 632 RVA: 0x0000A64F File Offset: 0x0000884F
		public void Update(byte[] data)
		{
			this.Update(data, 0, data.Length);
		}

		// Token: 0x06000279 RID: 633 RVA: 0x0000A65C File Offset: 0x0000885C
		public void Update(byte[] data, int offset, int length)
		{
			int num = 5550 - this.pend;
			for (int i = 0; i < length; i++)
			{
				if (i == num)
				{
					this.updateModulus();
					num = i + 5550;
				}
				this.a += (uint)data[i + offset];
				this.b += this.a;
				this.pend++;
			}
		}

		// Token: 0x0600027A RID: 634 RVA: 0x0000A6C7 File Offset: 0x000088C7
		public void Reset()
		{
			this.a = 1U;
			this.b = 0U;
			this.pend = 0;
		}

		// Token: 0x0600027B RID: 635 RVA: 0x0000A6DE File Offset: 0x000088DE
		private void updateModulus()
		{
			this.a %= 65521U;
			this.b %= 65521U;
			this.pend = 0;
		}

		// Token: 0x0600027C RID: 636 RVA: 0x0000A70B File Offset: 0x0000890B
		public uint GetValue()
		{
			if (this.pend > 0)
			{
				this.updateModulus();
			}
			return (this.b << 16) | this.a;
		}

		// Token: 0x04000147 RID: 327
		private const int _base = 65521;

		// Token: 0x04000148 RID: 328
		private const int _nmax = 5550;

		// Token: 0x04000149 RID: 329
		private uint a = 1U;

		// Token: 0x0400014A RID: 330
		private uint b;

		// Token: 0x0400014B RID: 331
		private int pend;
	}
}