File.cs :  » Development » NExcel » NExcelUtils » C# / CSharp Open Source

using System;
using System.IO;

namespace NExcelUtils{
  /// <summary>
  /// File utils.
  /// </summary>
  internal class File
  {
    private File()
    {
    }

    /// <summary>Reads a number of characters from the current source Stream and writes the data to the target array at the specified index.</summary>
    /// <param name="sourceStream">The source Stream to read from.</param>
    /// <param name="target">Contains the array of characteres read from the source Stream.</param>
    /// <param name="start">The starting index of the target array.</param>
    /// <param name="count">The maximum number of characters to read from the source Stream.</param>
    /// <returns>The number of characters read. The number will be less than or equal to count depending on the data available in the source Stream. Returns -1 if the end of the stream is reached.</returns>
    public static int ReadInput(Stream sourceStream, ref sbyte[] target, int start, int count)
    {
      // Returns 0 bytes if not enough space in target
      if (target.Length == 0)
        return 0;

      byte[] receiver = new byte[target.Length];
      int bytesRead   = sourceStream.Read(receiver, start, count);

      // Returns -1 if EOF
      if (bytesRead == 0)  
        return -1;
                
      for(int i = start; i < start + bytesRead; i++)
        target[i] = (sbyte)receiver[i];
                
      return bytesRead;
    }

  }
}