/// <summary>
/// Initializes a new instance of the <see cref="DataStream"/> class.
/// </summary>
/// <param name="filePath">File path.</param>
/// <param name="mode">File open mode.</param>
/// <param name="offset">Offset from the start of the file.</param>
/// <param name="length">Length of this DataStream.</param>
public DataStream(string filePath, FileOpenMode mode, long offset, long length)
{
if (string.IsNullOrEmpty(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
long fileSize = new FileInfo(filePath).Length;
if (offset < 0 || offset > fileSize)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (length < 0 || offset + length > fileSize)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
BaseStream = new FileStream(filePath, mode.ToFileMode(), mode.ToFileAccess());
isSubstream = true;
Offset = offset;
this.length = length;
IncreaseStreamCounter(BaseStream);
}
/// <summary>
/// Initializes a new instance of the <see cref="DataStream"/> class.
/// </summary>
/// <param name="filePath">File path.</param>
/// <param name="mode">File open mode.</param>
public DataStream(string filePath, FileOpenMode mode)
{
if (string.IsNullOrEmpty(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
BaseStream = new FileStream(filePath, mode.ToFileMode(), mode.ToFileAccess());
Offset = 0;
Length = BaseStream.Length;
IncreaseStreamCounter(BaseStream);
}
void Initialize()
{
isInitialized = true;
BaseStream = new FileStream(path, mode.ToFileMode(), mode.ToFileAccess());
}