public void TestBlockReadError()
{
// Create a memory stream to generate the data to work with
var memStream = new MemoryStream();
var writer = new BinaryWriter(memStream);
byte[] contents = { 0xFF, 0xFE, 0xFD, 0xFC };
byte[] offsetBytes = { 0, 0, 0, 0 };
// Write some data off so the memory stream starts with an offset
writer.Write(offsetBytes, 0, 4);
// Block ID
writer.Write(FileBlock.BLOCKID_NULL);
// Block length
writer.Write(contents.LongLength + 1); // Write a block length that is larger than the real block
// Block version
writer.Write((short)1);
// Block contents
memStream.Write(contents, 0, 4);
// Reset memory stream position and read a block
// We reset to just past the offset so the block offset property can be tested as well
memStream.Position = offsetBytes.Length;
FileBlock.FromStream(memStream, null);
}
public void TestBlockRead()
{
// Create a memory stream to generate the data to work with
var memStream = new MemoryStream();
var writer = new BinaryWriter(memStream);
byte[] contents = { 0xFF, 0xFE, 0xFD, 0xFC };
byte[] offsetBytes = { 0, 0, 0, 0 };
// Write some data off so the memory stream starts with an offset
writer.Write(offsetBytes, 0, 4);
// Block ID
writer.Write(FileBlock.BLOCKID_NULL);
// Block length
writer.Write(contents.LongLength);
// Block version
writer.Write((short)1);
// Block contents
memStream.Write(contents, 0, 4);
// Reset memory stream position and read a block
// We reset to just past the offset so the block offset property can be tested as well
memStream.Position = offsetBytes.Length;
var block = FileBlock.FromStream(memStream, null);
Assert.AreEqual(FileBlock.BLOCKID_NULL, block.BlockID, "The block's ID must match the data that was read off the stream");
Assert.AreEqual(offsetBytes.Length, block.BlockOffset, "The block's length must match the block content's size in bytes");
Assert.AreEqual(contents.Length, block.BlockLength, "The block's length must match the block content's size in bytes");
Assert.AreEqual(1, block.BlockVersion, "The block's ID must match the data that was read off the stream");
Assert.IsTrue(contents.SequenceEqual(block.GetBlockBuffer()), "The buffered data on the block must match the data that was read off the stream");
}
public void TestBlockWrite()
{
// Create a memory stream to generate the data to work with
var memStream = new MemoryStream();
var writeMemStream = new MemoryStream();
var writer = new BinaryWriter(memStream);
byte[] contents = { 0xFF, 0xFE, 0xFD, 0xFC };
byte[] offsetBytes = { 0, 0, 0, 0 };
// Write some data off so the memory stream starts with an offset
writer.Write(offsetBytes, 0, 4);
writeMemStream.Write(offsetBytes, 0, 4);
// Block ID
writer.Write(FileBlock.BLOCKID_NULL);
// Block length
writer.Write(contents.LongLength);
// Block version
writer.Write((short)1);
// Block contents
memStream.Write(contents, 0, 4);
// Reset memory stream position and read a block
// We reset to just past the offset so the block offset property can be tested as well
memStream.Position = offsetBytes.Length;
var block = FileBlock.FromStream(memStream, null);
block.SaveToStream(writeMemStream);
Assert.IsTrue(memStream.GetBuffer().SequenceEqual(writeMemStream.GetBuffer()),
"After writing the contents of a block back to a stream, its contents must exactly match the original contents that were read");
}
