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Viewing changes to Wrapper/FreeImage.NET/cs/Library/Classes/FreeImageStreamIO.cs

  • Committer: Stefano Rivera
  • Date: 2010-07-24 15:35:51 UTC
  • mto: This revision was merged to the branch mainline in revision 5.
  • Revision ID: stefanor@ubuntu.com-20100724153551-6s3fth1653huk31a
Tags: upstream-3.13.1
Import upstream version 3.31.1

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Wrapper/FreeImage.NET/cs/Library/Classes/FreeImageStreamIO.cs
 
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// ==========================================================
 
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// FreeImage 3 .NET wrapper
 
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// Original FreeImage 3 functions and .NET compatible derived functions
 
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//
 
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// Design and implementation by
 
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// - Jean-Philippe Goerke (jpgoerke@users.sourceforge.net)
 
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// - Carsten Klein (cklein05@users.sourceforge.net)
 
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//
 
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// Contributors:
 
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// - David Boland (davidboland@vodafone.ie)
 
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//
 
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// Main reference : MSDN Knowlede Base
 
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//
 
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// This file is part of FreeImage 3
 
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//
 
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// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
 
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// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
 
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// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
 
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// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
 
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// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
 
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// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
 
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// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
 
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// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 
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// THIS DISCLAIMER.
 
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//
 
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// Use at your own risk!
 
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// ==========================================================
 
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// ==========================================================
 
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// CVS
 
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// $Revision: 1.5 $
 
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// $Date: 2009/09/15 11:47:46 $
 
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// $Id: FreeImageStreamIO.cs,v 1.5 2009/09/15 11:47:46 cklein05 Exp $
 
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// ==========================================================
 
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using System;
 
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using System.IO;
 
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using System.Runtime.InteropServices;
 
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using System.Diagnostics;
 
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namespace FreeImageAPI.IO
 
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{
 
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        /// <summary>
 
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        /// Internal class wrapping stream io functions.
 
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        /// </summary>
 
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        /// <remarks>
 
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        /// FreeImage can read files from a disk or a network drive but also allows the user to
 
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        /// implement their own loading or saving functions to load them directly from an ftp or web
 
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        /// server for example.
 
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        /// <para/>
 
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        /// In .NET streams are a common way to handle data. The <b>FreeImageStreamIO</b> class handles
 
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        /// the loading and saving from and to streams. It implements the funtions FreeImage needs
 
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        /// to load data from an an arbitrary source.
 
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        /// <para/>
 
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        /// The class is for internal use only.
 
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        /// </remarks>
 
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        internal static class FreeImageStreamIO
 
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        {
 
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                /// <summary>
 
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                /// <see cref="FreeImageAPI.IO.FreeImageIO"/> structure that can be used to read from streams via
 
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                /// <see cref="FreeImageAPI.FreeImage.LoadFromHandle(FREE_IMAGE_FORMAT, ref FreeImageIO, fi_handle, FREE_IMAGE_LOAD_FLAGS)"/>.
 
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                /// </summary>
 
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                public static readonly FreeImageIO io;
 
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                /// <summary>
 
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                /// Initializes a new instances which can be used to
 
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                /// create a FreeImage compatible <see cref="FreeImageAPI.IO.FreeImageIO"/> structure.
 
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                /// </summary>
 
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                static FreeImageStreamIO()
 
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                {
 
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                        io.readProc = new ReadProc(streamRead);
 
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                        io.writeProc = new WriteProc(streamWrite);
 
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                        io.seekProc = new SeekProc(streamSeek);
 
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                        io.tellProc = new TellProc(streamTell);
 
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                }
 
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                /// <summary>
 
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                /// Reads the requested data from the stream and writes it to the given address.
 
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                /// </summary>
 
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                static unsafe uint streamRead(IntPtr buffer, uint size, uint count, fi_handle handle)
 
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                {
 
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                        Stream stream = handle.GetObject() as Stream;
 
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                        if ((stream == null) || (!stream.CanRead))
 
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                        {
 
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                                return 0;
 
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                        }
 
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                        uint readCount = 0;
 
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                        byte* ptr = (byte*)buffer;
 
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                        byte[] bufferTemp = new byte[size];
 
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                        int read;
 
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                        while (readCount < count)
 
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                        {
 
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                                read = stream.Read(bufferTemp, 0, (int)size);
 
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                                if (read != (int)size)
 
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                                {
 
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                                        stream.Seek(-read, SeekOrigin.Current);
 
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                                        break;
 
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                                }
 
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                                for (int i = 0; i < read; i++, ptr++)
 
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                                {
 
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                                        *ptr = bufferTemp[i];
 
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                                }
 
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                                readCount++;
 
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                        }
 
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                        return (uint)readCount;
 
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                }
 
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                /// <summary>
 
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                /// Reads the given data and writes it into the stream.
 
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                /// </summary>
 
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                static unsafe uint streamWrite(IntPtr buffer, uint size, uint count, fi_handle handle)
 
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                {
 
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                        Stream stream = handle.GetObject() as Stream;
 
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                        if ((stream == null) || (!stream.CanWrite))
 
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                        {
 
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                                return 0;
 
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                        }
 
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                        uint writeCount = 0;
 
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                        byte[] bufferTemp = new byte[size];
 
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                        byte* ptr = (byte*)buffer;
 
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                        while (writeCount < count)
 
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                        {
 
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                                for (int i = 0; i < size; i++, ptr++)
 
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                                {
 
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                                        bufferTemp[i] = *ptr;
 
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                                }
 
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                                try
 
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                                {
 
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                                        stream.Write(bufferTemp, 0, bufferTemp.Length);
 
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                                }
 
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                                catch
 
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                                {
 
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                                        return writeCount;
 
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                                }
 
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                                writeCount++;
 
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                        }
 
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                        return writeCount;
 
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                }
 
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                /// <summary>
 
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                /// Moves the streams position.
 
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                /// </summary>
 
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                static int streamSeek(fi_handle handle, int offset, SeekOrigin origin)
 
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                {
 
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                        Stream stream = handle.GetObject() as Stream;
 
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                        if (stream == null)
 
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                        {
 
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                                return 1;
 
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                        }
 
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                        stream.Seek((long)offset, origin);
 
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                        return 0;
 
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                }
 
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                /// <summary>
 
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                /// Returns the streams current position
 
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                /// </summary>
 
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                static int streamTell(fi_handle handle)
 
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                {
 
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                        Stream stream = handle.GetObject() as Stream;
 
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                        if (stream == null)
 
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                        {
 
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                                return -1;
 
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                        }
 
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                        return (int)stream.Position;
 
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                }
 
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        }
 
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}
 
 
b'\\ No newline at end of file'