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Added ability to arbitrarily get data from a File by offset and length (without having to read the ENTIRE file from the source data); this must be supported by your DataFormat's implementation of DataRequest though

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This commit is contained in:
Michael Becker 2015-07-23 10:03:48 -04:00
parent eca27273f3
commit a3fba29ef9
2 changed files with 51 additions and 7 deletions
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22
CSharp/Plugins/UniversalEditor.Essential/ObjectModels/FileSystem/DataRequestEvent.cs
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@ -2,13 +2,23 @@
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UniversalEditor.IO;
namespace UniversalEditor.ObjectModels.FileSystem
{
public delegate void DataRequestEventHandler(object sender, DataRequestEventArgs e);
public class DataRequestEventArgs : EventArgs
{
private byte[] mvarData = null;
public byte[] Data { get { return mvarData; } set { mvarData = value; } }
}
public delegate void DataRequestEventHandler(object sender, DataRequestEventArgs e);
public class DataRequestEventArgs : EventArgs
{
private byte[] mvarData = null;
public byte[] Data { get { return mvarData; } set { mvarData = value; } }
private Reader mvarReader = null;
public Reader Reader { get { return mvarReader; } set { mvarReader = value; } }
private long mvarOffset = 0;
public long Offset { get { return mvarOffset; } set { mvarOffset = value; } }
private long mvarLength = 0;
public long Length { get { return mvarLength; } set { mvarLength = value; } }
}
}

36
CSharp/Plugins/UniversalEditor.Essential/ObjectModels/FileSystem/File.cs
View File

@ -99,7 +99,18 @@ namespace UniversalEditor.ObjectModels.FileSystem
{
DataRequestEventArgs e = new DataRequestEventArgs();
DataRequest(this, e);
mvarData = e.Data;
if (e.Data == null && e.Reader == null)
{
Console.WriteLine("DataRequest: " + mvarName + ": Data is not represented as a byte array or Reader");
}
else if (e.Data != null)
{
mvarData = e.Data;
}
else
{
Console.WriteLine("DataRequest: " + mvarName + ": Data is not represented as a byte array; please use GetData() method");
}
}
return mvarData;
}
@ -109,6 +120,29 @@ namespace UniversalEditor.ObjectModels.FileSystem
mvarData = data;
}
public byte[] GetData(long offset, long length)
{
DataRequestEventArgs e = new DataRequestEventArgs();
DataRequest(this, e);
if (e.Data != null)
{
long realLength = Math.Min(length, e.Data.Length);
byte[] data = new byte[realLength];
Array.Copy(e.Data, 0, data, 0, realLength);
return data;
}
else if (e.Reader != null)
{
long realLength = Math.Min(length, e.Length);
e.Reader.Seek(e.Offset + offset, IO.SeekOrigin.Begin);
byte[] data = e.Reader.ReadBytes(length);
return data;
}
Console.WriteLine("DataRequest: " + mvarName + ": Data is not represented as a byte array or Reader");
return null;
}
private System.IO.Stream mvarStream = null;
public System.IO.Stream GetDataAsStream()
{