//------------------------------------------------------------------------------
//   Copyright (c) Microsoft Corporation. All Rights Reserved.
//------------------------------------------------------------------------------

namespace Microsoft.Singularity.WebServer
{
    using System;
    using System.Collections;
    using System.Text;

    internal sealed class ByteParser
    {
        private byte[] bytes;
        private int pos;

        public ByteParser(byte[]! bytes)
        {
            this.bytes = bytes;
            this.pos = 0;
        }

        public int CurrentOffset
        {
            get { 
                return pos; 
            }
        }

        public ByteString ReadLine()
        {
            ByteString line = null;

            for (int i = pos; i < bytes.Length; i++) {
                if (bytes[i] == (byte)'\n') {
                    int len = i-pos;
                    if (len > 0 && bytes[i - 1] == (byte)'\r') {
                        len--;
                    }

                    line = new ByteString(bytes, pos, len);
                    pos = i+1;
                    return line;
                }
            }

            if (pos < bytes.Length) {
                line = new ByteString(bytes, pos, bytes.Length-pos);
            }

            pos = bytes.Length;
            return line;
        }
    }
}