Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ImageListStreamer.cs / 1 / ImageListStreamer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Runtime.InteropServices; using System.Runtime.Serialization; using System.Diagnostics; using System; using System.Drawing; using System.ComponentModel; using System.IO; using System.Windows.Forms; using Microsoft.Win32; using System.Globalization; using System.Security.Permissions; ////// /// [Serializable] public sealed class ImageListStreamer : ISerializable { // compressed magic header. If we see this, the image stream is compressed. // (unicode for MSFT). // private static readonly byte[] HEADER_MAGIC = new byte[] {0x4D, 0x53, 0x46, 0X74}; private static object internalSyncObject = new object(); private ImageList imageList; private ImageList.NativeImageList nativeImageList; internal ImageListStreamer(ImageList il) { imageList = il; } /** * Constructor used in deserialization */ private ImageListStreamer(SerializationInfo info, StreamingContext context) { SerializationInfoEnumerator sie = info.GetEnumerator(); if (sie == null) { return; } while (sie.MoveNext()) { if (String.Equals(sie.Name, "Data", StringComparison.OrdinalIgnoreCase)) { #if DEBUG try { #endif byte[] dat = (byte[])sie.Value; if (dat != null) { //VSW #123063: We enclose this imagelist handle create in a theming scope. This is a temporary // solution till we tackle the bigger issue tracked by VSW #95247 IntPtr userCookie = UnsafeNativeMethods.ThemingScope.Activate(); try { MemoryStream ms = new MemoryStream(Decompress(dat)); lock (internalSyncObject) { SafeNativeMethods.InitCommonControls(); nativeImageList = new ImageList.NativeImageList( SafeNativeMethods.ImageList_Read(new UnsafeNativeMethods.ComStreamFromDataStream(ms))); } } finally { UnsafeNativeMethods.ThemingScope.Deactivate(userCookie); } if (nativeImageList.Handle == IntPtr.Zero) { throw new InvalidOperationException(SR.GetString(SR.ImageListStreamerLoadFailed)); } } #if DEBUG } catch (Exception e) { Debug.Fail("ImageList serialization failure: " + e.ToString()); throw; } #endif } } } ////// Compresses the given input, returning a new array that represents /// the compressed data. /// private byte[] Compress(byte[] input) { int finalLength = 0; int idx = 0; int compressedIdx = 0; while(idx < input.Length) { byte current = input[idx++]; byte runLength = 1; while(idx < input.Length && input[idx] == current && runLength < 0xFF) { runLength++; idx++; } finalLength += 2; } byte[] output = new byte[finalLength + HEADER_MAGIC.Length]; Buffer.BlockCopy(HEADER_MAGIC, 0, output, 0, HEADER_MAGIC.Length); int idxOffset = HEADER_MAGIC.Length; idx = 0; while(idx < input.Length) { byte current = input[idx++]; byte runLength = 1; while(idx < input.Length && input[idx] == current && runLength < 0xFF) { runLength++; idx++; } output[idxOffset + compressedIdx++] = runLength; output[idxOffset + compressedIdx++] = current; } Debug.Assert(idxOffset + compressedIdx == output.Length, "RLE Compression failure in ImageListStreamer -- didn't fill array"); // Validate that our compression routine works #if DEBUG byte[] debugCompare = Decompress(output); Debug.Assert(debugCompare.Length == input.Length, "RLE Compression in ImageListStreamer is broken."); int debugMaxCompare = input.Length; for(int debugIdx = 0; debugIdx < debugMaxCompare; debugIdx++) { if (debugCompare[debugIdx] != input[debugIdx]) { Debug.Fail("RLE Compression failure in ImageListStreamer at byte offset " + debugIdx); break; } } #endif // DEBUG return output; } ////// Decompresses the given input, returning a new array that represents /// the uncompressed data. /// private byte[] Decompress(byte[] input) { int finalLength = 0; int idx = 0; int outputIdx = 0; // Check for our header. If we don't have one, // we're not actually decompressed, so just return // the original. // if (input.Length < HEADER_MAGIC.Length) { return input; } for(idx = 0; idx < HEADER_MAGIC.Length; idx++) { if (input[idx] != HEADER_MAGIC[idx]) { return input; } } // Ok, we passed the magic header test. for (idx = HEADER_MAGIC.Length; idx < input.Length; idx+=2) { finalLength += input[idx]; } byte[] output = new byte[finalLength]; idx = HEADER_MAGIC.Length; while(idx < input.Length) { byte runLength = input[idx++]; byte current = input[idx++]; int startIdx = outputIdx; int endIdx = outputIdx + runLength; while(startIdx < endIdx) { output[startIdx++] = current; } outputIdx += runLength; } return output; } ////// /// [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] public void /*cpr: ISerializable*/GetObjectData(SerializationInfo si, StreamingContext context) { MemoryStream stream = new MemoryStream(); IntPtr handle = IntPtr.Zero; if (imageList != null) { handle = imageList.Handle; } else if (nativeImageList != null) { handle = nativeImageList.Handle; } if (handle == IntPtr.Zero || !WriteImageList(handle, stream)) throw new InvalidOperationException(SR.GetString(SR.ImageListStreamerSaveFailed)); si.AddValue("Data", Compress(stream.ToArray())); } ///[To be supplied.] ////// internal ImageList.NativeImageList GetNativeImageList() { return nativeImageList; } private bool WriteImageList(IntPtr imagelistHandle, Stream stream) { // What we need to do here is use WriteEx if comctl 6 or above, and Write otherwise. However, till we can fix // VSWhidbey #248889, there isn't a reliable way to tell which version of comctl fusion is binding to. // So for now, we try to bind to WriteEx, and if that entry point isn't found, we use Write. try { int hResult = SafeNativeMethods.ImageList_WriteEx(new HandleRef(this, imagelistHandle), NativeMethods.ILP_DOWNLEVEL, new UnsafeNativeMethods.ComStreamFromDataStream(stream)); return (hResult == NativeMethods.S_OK); } catch (EntryPointNotFoundException) { // WriteEx wasn't found - that's fine - we will use Write. } return SafeNativeMethods.ImageList_Write(new HandleRef(this, imagelistHandle), new UnsafeNativeMethods.ComStreamFromDataStream(stream)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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