Read binary context of a file.

image_pdfimage_print
   
 
#region License and Copyright
/* -------------------------------------------------------------------------
 * Dotnet Commons IO
 *
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 * -------------------------------------------------------------------------
 */
#endregion

using System;
using System.Collections;
using System.Globalization;
using System.IO;

namespace Dotnet.Commons.IO
{

    ///  
    /// <summary>  
    /// This class provides basic facilities for manipulating files and file paths.
    /// 
    /// <h3>File-related methods</h3>
    /// There are methods to 
    /// <list type="bullet">
    ///     <item>copy a file to another file,</item>
    ///     <item>compare the content of 2 files,</item>
    ///     <item>delete files using the wildcard character,</item>
    ///     <item>etc</item>
    /// </list>
    /// </summary>
    ///     
    public sealed class FileUtils
    {
        /// <summary>
        /// Reads data from the beginning of a stream until the end is reached. The
        /// data is returned as a byte array. 
        /// </summary>
        /// <param name="stream">The stream to read data from</param>
        /// <exception cref="IOException">thrown if any of the underlying IO calls fail</exception>
        /// <remarks>Use this method if you don&#039;t know the length of the stream in advance 
        /// (for instance a network stream) and just want to read the whole lot into a buffer. 
        /// <para>
        /// <strong>Note:</strong><br/>
        /// This method of reading the stream is not terribly efficient.
        /// </para>
        ///  </remarks>
        public static byte[] GetBytes(Stream stream)
        {
            if (stream is MemoryStream)
                return ((MemoryStream)stream).ToArray();

            byte[] byteArray = new byte[1024];
            using (MemoryStream ms = new MemoryStream())
            {
                stream.Position = 0;
                while (true)
                {
                    int readLen = stream.Read(byteArray, 0, byteArray.Length);
                    if (readLen <= 0)
                        return ms.ToArray();
                    ms.Write(byteArray, 0, readLen);
                }
            }
        }
        /// <summary>
        /// Reads data from a stream until the end is reached. The
        /// data is returned as a byte array. 
        /// </summary>
        /// <param name="stream">The stream to read data from</param>
        /// <param name="initialLength">The initial buffer length. If the length is &amp;lt; 1,
        /// then the default value of <see cref="Int16.MaxValue"/> will be used.
        /// </param>
        /// <exception cref="IOException">thrown if any of the underlying IO calls fail</exception>
        /// <remarks>Use this method to get the data if you know the expected length of data to start with.</remarks>
        public static byte[] GetBytes(Stream stream, long initialLength)
        {
            // If we&#039;ve been passed an unhelpful initial length, just
            // use 32K.
            if (initialLength < 1)
                initialLength = Int16.MaxValue;


            byte&#91;&#93; buffer = new byte&#91;initialLength&#93;;
            int read = 0;

            int chunk;
            while ((chunk = stream.Read(buffer, read, buffer.Length - read)) > 0)
            {
                read += chunk;

                // If we&#039;ve reached the end of our buffer, check to see if there&#039;s
                // any more information
                if (read == buffer.Length)
                {
                    int nextByte = stream.ReadByte();

                    // End of stream? If so, we&#039;re done
                    if (nextByte == -1)
                    {
                        return buffer;
                    }

                    // Nope. Resize the buffer, put in the byte we&#039;ve just
                    // read, and continue
                    byte[] newBuffer = new byte[buffer.Length * 2];
                    Array.Copy(buffer, newBuffer, buffer.Length);
                    newBuffer[read] = (byte)nextByte;
                    buffer = newBuffer;
                    read++;
                }
            }
            // Buffer is now too big. Shrink it.
            byte[] ret = new byte[read];
            Array.Copy(buffer, ret, read);
            return ret;
        }
        /// ---------------------------------------------------------------
        /// <summary>
        /// Read binary context of a file.
        /// </summary>
        /// <param name="path">Full path (directory + filename) of file to read</param>
        /// <returns>content in byte array</returns>
        /// ---------------------------------------------------------------
        public static byte[] ReadBinaryFile(string path)
        {
            FileInfo fi = new FileInfo(path);
            byte[] data = null;

            if (!fi.Exists)
                throw new IOException(path + " does not exists");

            // Read File 
            using (Stream stream = File.OpenRead(path))
            {
                // Get Data from The Stream
                data = GetBytes(stream, fi.Length);

                // Close Stream
                stream.Close();
            }

            fi.Refresh();

            // Return Data
            return (data);
        }
    }
}

   
     


This entry was posted in File Stream. Bookmark the permalink.