/*
    * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
   */
  
  package org.eclipse.jgit.internal.storage.file;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.transport.PackedObjectInfo;
  import org.eclipse.jgit.util.NB;
  
  /**
   * Creates the version 1 (old style) pack table of contents files.
   *
   * @see PackIndexWriter
   * @see PackIndexV1
   */
  class PackIndexWriterV1 extends PackIndexWriter {
  	static boolean canStore(PackedObjectInfo oe) {
  		// We are limited to 4 GB per pack as offset is 32 bit unsigned int.
  		//
  		return oe.getOffset() >>> 1 < Integer.MAX_VALUE;
  	}
  
  	PackIndexWriterV1(final OutputStream dst) {
  		super(dst);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void writeImpl() throws IOException {
  		writeFanOutTable();
  
  		for (PackedObjectInfo oe : entries) {
  			if (!canStore(oe))
  				throw new IOException(JGitText.get().packTooLargeForIndexVersion1);
  			NB.encodeInt32(tmp, 0, (int) oe.getOffset());
  			oe.copyRawTo(tmp, 4);
  			out.write(tmp);
  		}
  
  		writeChecksumFooter();
  	}
  }