| public Seek ( long offset, SeekOrigin origin ) : long | ||
| offset | long | |
| origin | SeekOrigin | |
| return | long | |
public void TestNonSequentialWriteToOneChunk()
{
string filename = "nonsequential1.txt";
GridFileStream gfs = fs.Create(filename);
Object id = gfs.GridFileInfo.Id;
int chunksize = gfs.GridFileInfo.ChunkSize;
gfs.Seek(chunksize / 2, SeekOrigin.Begin);
byte[] two = new byte[] { 2 };
for (int i = chunksize; i > chunksize / 2; i--)
{
gfs.Write(two, 0, 1);
}
gfs.Seek(0, SeekOrigin.Begin);
byte[] one = new byte[] { 1 };
for (int i = 0; i < chunksize / 2; i++)
{
gfs.Write(one, 0, 1);
}
gfs.Close();
Assert.AreEqual(1, CountChunks(filesystem, id));
Document chunk = GrabChunk(id, 0);
Binary b = (Binary)chunk["data"];
Assert.AreEqual(2, b.Bytes[chunksize - 1]);
Assert.AreEqual(2, b.Bytes[chunksize / 2]);
Assert.AreEqual(1, b.Bytes[chunksize / 2 - 1]);
Assert.AreEqual(1, b.Bytes[0]);
}
public void TestNonSequentialWriteToTwoChunks()
{
GridFileStream gfs = fs.Create("nonsequential2.txt");
Object id = gfs.GridFileInfo.Id;
int chunks = 3;
int buffsize = 256 * 1024;
for (int c = 0; c < chunks; c++)
{
Byte[] buff = CreateBuffer(buffsize, (byte)c);
if (c == 2)
{
gfs.Seek(0, SeekOrigin.Begin); //On last chunk seek to start.
}
gfs.Write(buff, 0, buff.Length);
}
Assert.AreEqual(buffsize, gfs.Position, "Position is incorrect");
gfs.Close();
Assert.AreEqual(chunks - 1, CountChunks(filesystem, id));
Document chunk = GrabChunk(id, 0);
Binary b = (Binary)chunk["data"];
Assert.AreEqual(2, b.Bytes[buffsize - 1]);
Assert.AreEqual(2, b.Bytes[0]);
chunk = GrabChunk(id, 1);
b = (Binary)chunk["data"];
Assert.AreEqual(1, b.Bytes[buffsize - 1]);
}
public void TestCopy()
{
GridFile fs = new GridFile(db["tests"], "gfcopy");
GridFileStream gfs = fs.Create("original.txt");
gfs.WriteByte(1);
gfs.Seek(1024 * 256 * 2, SeekOrigin.Begin);
gfs.WriteByte(2);
gfs.Close();
fs.Copy("original.txt", "copy.txt");
Assert.IsTrue(fs.Exists("original.txt"));
Assert.IsTrue(fs.Exists("copy.txt"));
//TODO Assert chunk data is the same too.
}
public void TestNonSequentialWriteToPartialChunk()
{
string filename = "nonsequentialpartial.txt";
GridFileStream gfs = fs.Create(filename);
Object id = gfs.GridFileInfo.Id;
int chunksize = gfs.GridFileInfo.ChunkSize;
gfs.Write(BitConverter.GetBytes(0), 0, 4);
Assert.AreEqual(4, gfs.Position);
gfs.Write(BitConverter.GetBytes(7), 0, 4);
Assert.AreEqual(8, gfs.Position);
gfs.Seek(0, SeekOrigin.Begin);
gfs.Write(BitConverter.GetBytes(15), 0, 4);
gfs.Close();
Document chunk = GrabChunk(id, 0);
Binary b = (Binary)chunk["data"];
Assert.AreEqual(8, b.Bytes.Length);
}
public GridFileStream Open(FileMode mode, FileAccess access)
{
switch (mode)
{
case FileMode.Create:
if (gridFile.Exists(this.FileName) == true)
{
return(this.Open(FileMode.Truncate, access));
}
else
{
return(this.Create(FileMode.CreateNew, access));
}
case FileMode.CreateNew:
return(this.Create(mode, access));
case FileMode.Open:
LoadFileData();
return(new GridFileStream(this, this.gridFile.Files, this.gridFile.Chunks, access));
case FileMode.OpenOrCreate:
if (gridFile.Exists(this.FileName) == false)
{
return(this.Create(mode, access));
}
LoadFileData();
return(new GridFileStream(this, this.gridFile.Files, this.gridFile.Chunks, access));
case FileMode.Truncate:
this.Truncate();
return(new GridFileStream(this, this.gridFile.Files, this.gridFile.Chunks, access));
case FileMode.Append:
LoadFileData();
GridFileStream gfs = new GridFileStream(this, this.gridFile.Files, this.gridFile.Chunks, access);
gfs.Seek(0, SeekOrigin.End);
return(gfs);
}
throw new NotImplementedException("Mode not implemented.");
}
public GridFileStream Open(FileMode mode, FileAccess access)
{
switch (mode) {
case FileMode.Create:
if(gridFile.Exists(this.FileName) == true){
return this.Open(FileMode.Truncate, access);
}else{
return this.Create(FileMode.CreateNew, access);
}
case FileMode.CreateNew:
return this.Create(mode, access);
case FileMode.Open:
LoadFileData();
return new GridFileStream(this,this.gridFile.Files, this.gridFile.Chunks, access);
case FileMode.OpenOrCreate:
if(gridFile.Exists(this.FileName) == false) return this.Create(mode, access);
LoadFileData();
return new GridFileStream(this, this.gridFile.Files, this.gridFile.Chunks, access);
case FileMode.Truncate:
this.Truncate();
return new GridFileStream(this,this.gridFile.Files, this.gridFile.Chunks, access);
case FileMode.Append:
LoadFileData();
GridFileStream gfs = new GridFileStream(this,this.gridFile.Files, this.gridFile.Chunks, access);
gfs.Seek(0,SeekOrigin.End);
return gfs;
}
throw new NotImplementedException("Mode not implemented.");
}
