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- /*
- * 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.lib;
-
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStreamWriter;
- import java.security.MessageDigest;
- import java.util.zip.Deflater;
- import java.util.zip.DeflaterOutputStream;
-
- import org.eclipse.jgit.errors.ObjectWritingException;
-
- /**
- * A class for writing loose objects.
- */
- public class ObjectWriter {
- private static final byte[] htree = Constants.encodeASCII("tree");
-
- private static final byte[] hparent = Constants.encodeASCII("parent");
-
- private static final byte[] hauthor = Constants.encodeASCII("author");
-
- private static final byte[] hcommitter = Constants.encodeASCII("committer");
-
- private static final byte[] hencoding = Constants.encodeASCII("encoding");
-
- private final Repository r;
-
- private final byte[] buf;
-
- private final MessageDigest md;
-
- /**
- * Construct an Object writer for the specified repository
- * @param d
- */
- public ObjectWriter(final Repository d) {
- r = d;
- buf = new byte[8192];
- md = Constants.newMessageDigest();
- }
-
- /**
- * Write a blob with the specified data
- *
- * @param b bytes of the blob
- * @return SHA-1 of the blob
- * @throws IOException
- */
- public ObjectId writeBlob(final byte[] b) throws IOException {
- return writeBlob(b.length, new ByteArrayInputStream(b));
- }
-
- /**
- * Write a blob with the data in the specified file
- *
- * @param f
- * a file containing blob data
- * @return SHA-1 of the blob
- * @throws IOException
- */
- public ObjectId writeBlob(final File f) throws IOException {
- final FileInputStream is = new FileInputStream(f);
- try {
- return writeBlob(f.length(), is);
- } finally {
- is.close();
- }
- }
-
- /**
- * Write a blob with data from a stream
- *
- * @param len
- * number of bytes to consume from the stream
- * @param is
- * stream with blob data
- * @return SHA-1 of the blob
- * @throws IOException
- */
- public ObjectId writeBlob(final long len, final InputStream is)
- throws IOException {
- return writeObject(Constants.OBJ_BLOB, len, is, true);
- }
-
- /**
- * Write a Tree to the object database.
- *
- * @param t
- * Tree
- * @return SHA-1 of the tree
- * @throws IOException
- */
- public ObjectId writeTree(final Tree t) throws IOException {
- final ByteArrayOutputStream o = new ByteArrayOutputStream();
- final TreeEntry[] items = t.members();
- for (int k = 0; k < items.length; k++) {
- final TreeEntry e = items[k];
- final ObjectId id = e.getId();
-
- if (id == null)
- throw new ObjectWritingException("Object at path \""
- + e.getFullName() + "\" does not have an id assigned."
- + " All object ids must be assigned prior"
- + " to writing a tree.");
-
- e.getMode().copyTo(o);
- o.write(' ');
- o.write(e.getNameUTF8());
- o.write(0);
- id.copyRawTo(o);
- }
- return writeCanonicalTree(o.toByteArray());
- }
-
- /**
- * Write a canonical tree to the object database.
- *
- * @param b
- * the canonical encoding of the tree object.
- * @return SHA-1 of the tree
- * @throws IOException
- */
- public ObjectId writeCanonicalTree(final byte[] b) throws IOException {
- return writeTree(b.length, new ByteArrayInputStream(b));
- }
-
- private ObjectId writeTree(final long len, final InputStream is)
- throws IOException {
- return writeObject(Constants.OBJ_TREE, len, is, true);
- }
-
- /**
- * Write a Commit to the object database
- *
- * @param c
- * Commit to store
- * @return SHA-1 of the commit
- * @throws IOException
- */
- public ObjectId writeCommit(final Commit c) throws IOException {
- final ByteArrayOutputStream os = new ByteArrayOutputStream();
- String encoding = c.getEncoding();
- if (encoding == null)
- encoding = Constants.CHARACTER_ENCODING;
- final OutputStreamWriter w = new OutputStreamWriter(os, encoding);
-
- os.write(htree);
- os.write(' ');
- c.getTreeId().copyTo(os);
- os.write('\n');
-
- ObjectId[] ps = c.getParentIds();
- for (int i=0; i<ps.length; ++i) {
- os.write(hparent);
- os.write(' ');
- ps[i].copyTo(os);
- os.write('\n');
- }
-
- os.write(hauthor);
- os.write(' ');
- w.write(c.getAuthor().toExternalString());
- w.flush();
- os.write('\n');
-
- os.write(hcommitter);
- os.write(' ');
- w.write(c.getCommitter().toExternalString());
- w.flush();
- os.write('\n');
-
- if (!encoding.equals(Constants.CHARACTER_ENCODING)) {
- os.write(hencoding);
- os.write(' ');
- os.write(Constants.encodeASCII(encoding));
- os.write('\n');
- }
-
- os.write('\n');
- w.write(c.getMessage());
- w.flush();
-
- return writeCommit(os.toByteArray());
- }
-
- private ObjectId writeTag(final byte[] b) throws IOException {
- return writeTag(b.length, new ByteArrayInputStream(b));
- }
-
- /**
- * Write an annotated Tag to the object database
- *
- * @param c
- * Tag
- * @return SHA-1 of the tag
- * @throws IOException
- */
- public ObjectId writeTag(final Tag c) throws IOException {
- final ByteArrayOutputStream os = new ByteArrayOutputStream();
- final OutputStreamWriter w = new OutputStreamWriter(os,
- Constants.CHARSET);
-
- w.write("object ");
- c.getObjId().copyTo(w);
- w.write('\n');
-
- w.write("type ");
- w.write(c.getType());
- w.write("\n");
-
- w.write("tag ");
- w.write(c.getTag());
- w.write("\n");
-
- w.write("tagger ");
- w.write(c.getAuthor().toExternalString());
- w.write('\n');
-
- w.write('\n');
- w.write(c.getMessage());
- w.close();
-
- return writeTag(os.toByteArray());
- }
-
- private ObjectId writeCommit(final byte[] b) throws IOException {
- return writeCommit(b.length, new ByteArrayInputStream(b));
- }
-
- private ObjectId writeCommit(final long len, final InputStream is)
- throws IOException {
- return writeObject(Constants.OBJ_COMMIT, len, is, true);
- }
-
- private ObjectId writeTag(final long len, final InputStream is)
- throws IOException {
- return writeObject(Constants.OBJ_TAG, len, is, true);
- }
-
- /**
- * Compute the SHA-1 of a blob without creating an object. This is for
- * figuring out if we already have a blob or not.
- *
- * @param len number of bytes to consume
- * @param is stream for read blob data from
- * @return SHA-1 of a looked for blob
- * @throws IOException
- */
- public ObjectId computeBlobSha1(final long len, final InputStream is)
- throws IOException {
- return writeObject(Constants.OBJ_BLOB, len, is, false);
- }
-
- ObjectId writeObject(final int type, long len, final InputStream is,
- boolean store) throws IOException {
- final File t;
- final DeflaterOutputStream deflateStream;
- final FileOutputStream fileStream;
- ObjectId id = null;
- Deflater def = null;
-
- if (store) {
- t = File.createTempFile("noz", null, r.getObjectsDirectory());
- fileStream = new FileOutputStream(t);
- } else {
- t = null;
- fileStream = null;
- }
-
- md.reset();
- if (store) {
- def = new Deflater(r.getConfig().getCore().getCompression());
- deflateStream = new DeflaterOutputStream(fileStream, def);
- } else
- deflateStream = null;
-
- try {
- byte[] header;
- int n;
-
- header = Constants.encodedTypeString(type);
- md.update(header);
- if (deflateStream != null)
- deflateStream.write(header);
-
- md.update((byte) ' ');
- if (deflateStream != null)
- deflateStream.write((byte) ' ');
-
- header = Constants.encodeASCII(len);
- md.update(header);
- if (deflateStream != null)
- deflateStream.write(header);
-
- md.update((byte) 0);
- if (deflateStream != null)
- deflateStream.write((byte) 0);
-
- while (len > 0
- && (n = is.read(buf, 0, (int) Math.min(len, buf.length))) > 0) {
- md.update(buf, 0, n);
- if (deflateStream != null)
- deflateStream.write(buf, 0, n);
- len -= n;
- }
-
- if (len != 0)
- throw new IOException("Input did not match supplied length. "
- + len + " bytes are missing.");
-
- if (deflateStream != null ) {
- deflateStream.close();
- if (t != null)
- t.setReadOnly();
- }
-
- id = ObjectId.fromRaw(md.digest());
- } finally {
- if (id == null && deflateStream != null) {
- try {
- deflateStream.close();
- } finally {
- t.delete();
- }
- }
- if (def != null) {
- def.end();
- }
- }
-
- if (t == null)
- return id;
-
- if (r.hasObject(id)) {
- // Object is already in the repository so remove
- // the temporary file.
- //
- t.delete();
- } else {
- final File o = r.toFile(id);
- if (!t.renameTo(o)) {
- // Maybe the directory doesn't exist yet as the object
- // directories are always lazily created. Note that we
- // try the rename first as the directory likely does exist.
- //
- o.getParentFile().mkdir();
- if (!t.renameTo(o)) {
- if (!r.hasObject(id)) {
- // The object failed to be renamed into its proper
- // location and it doesn't exist in the repository
- // either. We really don't know what went wrong, so
- // fail.
- //
- t.delete();
- throw new ObjectWritingException("Unable to"
- + " create new object: " + o);
- }
- }
- }
- }
-
- return id;
- }
- }
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