Extract([NotNull] SequentialReader reader)
{
var directories = new List<Directory>();
reader.IsMotorolaByteOrder = false;
int type = 0;
int imageCount = 0;
// Read header (ICONDIR structure)
string error = null;
try
{
var reserved = reader.GetUInt16();
type = reader.GetUInt16();
imageCount = reader.GetUInt16();
if (reserved != 0)
error = "Invalid header bytes";
else if (type != 1 && type != 2)
error = "Invalid type " + type + " -- expecting 1 or 2";
else if (imageCount == 0)
error = "Image count cannot be zero";
}
catch (IOException ex)
{
error = "Exception reading ICO file metadata: " + ex.Message;
}
if (error != null)
{
var directory = new IcoDirectory();
directory.AddError(error);
directories.Add(directory);
return directories;
}
// Read each embedded image
for (var imageIndex = 0; imageIndex < imageCount; imageIndex++)
{
var directory = new IcoDirectory();
try
{
directory.Set(IcoDirectory.TagImageType, type);
directory.Set(IcoDirectory.TagImageWidth, reader.GetByte());
directory.Set(IcoDirectory.TagImageHeight, reader.GetByte());
directory.Set(IcoDirectory.TagColourPaletteSize, reader.GetByte());
// Ignore this byte (normally zero, though .NET's System.Drawing.Icon.Save method writes 255)
reader.GetByte();
if (type == 1)
{
// Icon
directory.Set(IcoDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(IcoDirectory.TagBitsPerPixel, reader.GetUInt16());
}
else
{
// Cursor
directory.Set(IcoDirectory.TagCursorHotspotX, reader.GetUInt16());
directory.Set(IcoDirectory.TagCursorHotspotY, reader.GetUInt16());
}
directory.Set(IcoDirectory.TagImageSizeBytes, reader.GetUInt32());
directory.Set(IcoDirectory.TagImageOffsetBytes, reader.GetUInt32());
}
catch (IOException ex)
{
directory.AddError("Exception reading ICO file metadata: " + ex.Message);
}
directories.Add(directory);
if (directory.HasError)
break;
}
return directories;
}
public DirectoryList Extract([NotNull] SequentialReader reader)
{
var directories = new List <Directory>();
reader = reader.WithByteOrder(isMotorolaByteOrder: false);
var type = 0;
var imageCount = 0;
// Read header (ICONDIR structure)
string error = null;
try
{
var reserved = reader.GetUInt16();
type = reader.GetUInt16();
imageCount = reader.GetUInt16();
if (reserved != 0)
{
error = "Invalid header bytes";
}
else if (type != 1 && type != 2)
{
error = "Invalid type " + type + " -- expecting 1 or 2";
}
else if (imageCount == 0)
{
error = "Image count cannot be zero";
}
}
catch (IOException ex)
{
error = "Exception reading ICO file metadata: " + ex.Message;
}
if (error != null)
{
var directory = new IcoDirectory();
directory.AddError(error);
directories.Add(directory);
return(directories);
}
// Read each embedded image
for (var imageIndex = 0; imageIndex < imageCount; imageIndex++)
{
var directory = new IcoDirectory();
try
{
directory.Set(IcoDirectory.TagImageType, type);
directory.Set(IcoDirectory.TagImageWidth, reader.GetByte());
directory.Set(IcoDirectory.TagImageHeight, reader.GetByte());
directory.Set(IcoDirectory.TagColourPaletteSize, reader.GetByte());
// Ignore this byte (normally zero, though .NET's System.Drawing.Icon.Save method writes 255)
reader.GetByte();
if (type == 1)
{
// Icon
directory.Set(IcoDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(IcoDirectory.TagBitsPerPixel, reader.GetUInt16());
}
else
{
// Cursor
directory.Set(IcoDirectory.TagCursorHotspotX, reader.GetUInt16());
directory.Set(IcoDirectory.TagCursorHotspotY, reader.GetUInt16());
}
directory.Set(IcoDirectory.TagImageSizeBytes, reader.GetUInt32());
directory.Set(IcoDirectory.TagImageOffsetBytes, reader.GetUInt32());
}
catch (IOException ex)
{
directory.AddError("Exception reading ICO file metadata: " + ex.Message);
}
directories.Add(directory);
if (directory.HasError)
{
break;
}
}
return(directories);
}
