/* * Copyright 2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ using System; namespace Lucene.Net.Store { /// A memory-resident {@link InputStream} implementation. /// /// /// $Id: RAMInputStream.cs,v 1.2 2005/10/06 19:29:58 dsd Exp $ /// class RAMInputStream : BufferedIndexInput, System.ICloneable { private RAMFile file; private int pointer = 0; private long length; public RAMInputStream(RAMFile f) { file = f; length = file.length; } public override void ReadInternal(byte[] dest, int destOffset, int len) { int remainder = len; int start = pointer; while (remainder != 0) { int bufferNumber = start / BUFFER_SIZE; int bufferOffset = start % BUFFER_SIZE; int bytesInBuffer = BUFFER_SIZE - bufferOffset; int bytesToCopy = bytesInBuffer >= remainder?remainder:bytesInBuffer; byte[] buffer = (byte[]) file.buffers[bufferNumber]; Array.Copy(buffer, bufferOffset, dest, destOffset, bytesToCopy); destOffset += bytesToCopy; start += bytesToCopy; remainder -= bytesToCopy; } pointer += len; } public override void Close() { } public override void SeekInternal(long pos) { pointer = (int) pos; } public override long Length() { return length; } } }