dividing binary data into smaller chunks

Ram Prasad

I am trying to divide binary data into small chunks from .txt file using the code below. However, this code is reading 0 and 1 in ASCII code and showing the results in 48 and 49 respectively. How can I fix this?

For Ex: 0101 is being read as 48494849.

public static IEnumerablebyte>> ReadByChunk(int chunkSize)
{
IEnumerable<byte> result;
int startingByte = 0;
do
{
result = ReadBytes(startingByte, chunkSize);
startingByte += chunkSize;
yield return result;
} while (result.Any());
}
public static IEnumerable<byte> ReadBytes(int startingByte, int byteToRead)
{
byte[] result;
using (FileStream stream = File.Open(@"C:\Users\file.txt", FileMode.Open, FileAccess.Read, FileShare.Read))
using (BinaryReader reader = new BinaryReader(stream))
{
int bytesToRead = Math.Max(Math.Min(byteToRead, (int)reader.BaseStream.Length - startingByte), 0);
reader.BaseStream.Seek(startingByte, SeekOrigin.Begin);
result = reader.ReadBytes(bytesToRead);
}
return result;
}
public static void Main()
{
foreach (IEnumerable<byte> bytes in ReadByChunk(chunkSize))
{
// more code
}
}

4 Replies

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Aman Gupta6y ago
Simply use this
foreach (IEnumerable<byte> bytes in ReadByChunk(1))
{
    foreach (var item in bytes)
    {
        double re = Char.GetNumericValue((char)item);
    }
}
+2
Laxmidhar Sahoo6y ago
Hi

The range of byte data type is 0 to 255 .You are telling about bit which is stored in 0 and 1.

reader.ReadBytes(bytesToRead) this function return byte array not bit array .

If again you have confused please convey.

Thanks and regards
+3
Ram Prasad6y ago
@Laxmidhar Sahoo - Your solution still shows output in 48 and 49 instead of 0 and 1
+3
Laxmidhar Sahoo6y ago
Hi
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
   public class Smallchumps
    {
        public static IEnumerablebyte>> ReadByChunk(int chunkSize)
        {
            IEnumerable<byte> result;
            Listbyte>> results = new Listbyte>>();
            int startingByte = 0;
            do
            {
                result = ReadBytes(startingByte, chunkSize);
                startingByte += chunkSize;
                results.Add(result);
                //yield return result;
            } while (result.Any());

            return results;
        }
        public static IEnumerable<byte> ReadBytes(int startingByte, int byteToRead)
        {
            byte[] result;
            using (FileStream stream = File.Open(@"D:\temp1.txt", FileMode.Open, FileAccess.Read, FileShare.Read))
            using (BinaryReader reader = new BinaryReader(stream))
            {
                int bytesToRead = Math.Max(Math.Min(byteToRead, (int)reader.BaseStream.Length - startingByte), 0);
                reader.BaseStream.Seek(startingByte, SeekOrigin.Begin);
                result = reader.ReadBytes(bytesToRead);
            }
            return result;
        }
        public static void getchunks()
        {
            var r = ReadByChunk(500);

        }
    }
}
+3