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- /*
- * Copyright (C) 2008-2011, Google Inc.
- * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.dfs;
-
- import java.io.IOException;
- import java.security.MessageDigest;
- import java.util.zip.CRC32;
- import java.util.zip.DataFormatException;
- import java.util.zip.Inflater;
-
- import org.eclipse.jgit.internal.storage.pack.PackOutputStream;
-
- /** A cached slice of a {@link DfsPackFile}. */
- final class DfsBlock {
- final DfsPackKey pack;
-
- final long start;
-
- final long end;
-
- private final byte[] block;
-
- DfsBlock(DfsPackKey p, long pos, byte[] buf) {
- pack = p;
- start = pos;
- end = pos + buf.length;
- block = buf;
- }
-
- int size() {
- return block.length;
- }
-
- boolean contains(DfsPackKey want, long pos) {
- return pack == want && start <= pos && pos < end;
- }
-
- int copy(long pos, byte[] dstbuf, int dstoff, int cnt) {
- int ptr = (int) (pos - start);
- return copy(ptr, dstbuf, dstoff, cnt);
- }
-
- int copy(int p, byte[] b, int o, int n) {
- n = Math.min(block.length - p, n);
- System.arraycopy(block, p, b, o, n);
- return n;
- }
-
- int setInput(long pos, Inflater inf) {
- int ptr = (int) (pos - start);
- int cnt = block.length - ptr;
- inf.setInput(block, ptr, cnt);
- return cnt;
- }
-
- void crc32(CRC32 out, long pos, int cnt) {
- int ptr = (int) (pos - start);
- out.update(block, ptr, cnt);
- }
-
- void write(PackOutputStream out, long pos, int cnt, MessageDigest digest)
- throws IOException {
- int ptr = (int) (pos - start);
- out.write(block, ptr, cnt);
- if (digest != null)
- digest.update(block, ptr, cnt);
- }
-
- void check(Inflater inf, byte[] tmp, long pos, int cnt)
- throws DataFormatException {
- // Unlike inflate() above the exact byte count is known by the caller.
- // Push all of it in a single invocation to avoid unnecessary loops.
- //
- inf.setInput(block, (int) (pos - start), cnt);
- while (inf.inflate(tmp, 0, tmp.length) > 0)
- continue;
- }
- }
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