| /* |
| * 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; |
| } |
| } |