IsoFilePatcher-Archive/Iso9660/ExtensionsMethods.cs

using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;

namespace IsoFilePatcher.Iso9660
{
    internal static class ExtensionsMethods
    {
        public static string ReadString(this BinaryReader br, int len, Encoding encoding = null)
        {
            var buf = br.ReadBytes(len);
            return (encoding ?? Encoding.ASCII).GetString(buf);
        }

        public static uint ReadUInt32LsbMsb(this BinaryReader br)
        {
            var a = br.ReadUInt32();
            var b = br.ReadUInt32();
            return BitConverter.IsLittleEndian ? a : b;
        }

        public static ushort ReadUInt16LsbMsb(this BinaryReader br)
        {
            var a = br.ReadUInt16();
            var b = br.ReadUInt16();
            return BitConverter.IsLittleEndian ? a : b;
        }

        public static DateTime ReadDecDateTime(this BinaryReader br)
        {
            var str = br.ReadString(16);
            var tz = br.ReadByte();
            if (str[0] == '\0' || str.All(p => p == '0')) return new DateTime();
            var dt = DateTime.ParseExact(str, "yyyyMMddHHmmssff", CultureInfo.InvariantCulture);
            return dt;
        }

        public static DateTime ReadFileRecordDate(this BinaryReader br)
        {
            var year = br.ReadByte();
            var mon = br.ReadByte();
            var day = br.ReadByte();
            var hour = br.ReadByte();
            var min = br.ReadByte();
            var sec = br.ReadByte();
            var tz = br.ReadByte();

            var dt = new DateTime(year + 1900, mon, day, hour, min, sec);
            return dt;
        }

        public static string ReadBytePrefixString(this BinaryReader br, Encoding encoding = null)
        {
            return (encoding ?? Encoding.ASCII).GetString(br.ReadBytes(br.ReadByte()));
        }
    }
}