org.eclipse.jgit/src/org/eclipse/jgit/patch/Patch.java - jgit - Git at Google

 /*
  * Copyright (C) 2008-2009, Google Inc.
  * 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.patch;

 import static org.eclipse.jgit.lib.Constants.encodeASCII;
 import static org.eclipse.jgit.patch.FileHeader.NEW_NAME;
 import static org.eclipse.jgit.patch.FileHeader.OLD_NAME;
 import static org.eclipse.jgit.patch.FileHeader.isHunkHdr;
 import static org.eclipse.jgit.util.RawParseUtils.match;
 import static org.eclipse.jgit.util.RawParseUtils.nextLF;

 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;

 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.util.TemporaryBuffer;

 /**
  * A parsed collection of {@link org.eclipse.jgit.patch.FileHeader}s from a
  * unified diff patch file
  */
 public class Patch {
 	static final byte[] DIFF_GIT = encodeASCII("diff --git "); //$NON-NLS-1$

 	private static final byte[] DIFF_CC = encodeASCII("diff --cc "); //$NON-NLS-1$

 	private static final byte[] DIFF_COMBINED = encodeASCII("diff --combined "); //$NON-NLS-1$

 	private static final byte[][] BIN_HEADERS = new byte[][] {
 			encodeASCII("Binary files "), encodeASCII("Files "), }; //$NON-NLS-1$ //$NON-NLS-2$

 	private static final byte[] BIN_TRAILER = encodeASCII(" differ\n"); //$NON-NLS-1$

 	private static final byte[] GIT_BINARY = encodeASCII("GIT binary patch\n"); //$NON-NLS-1$

 	static final byte[] SIG_FOOTER = encodeASCII("-- \n"); //$NON-NLS-1$

 	/** The files, in the order they were parsed out of the input. */
 	private final List<FileHeader> files;

 	/** Formatting errors, if any were identified. */
 	private final List<FormatError> errors;

 	/**
 	 * Create an empty patch.
 	 */
 	public Patch() {
 		files = new ArrayList<>();
 		errors = new ArrayList<>(0);
 	}

 	/**
 	 * Add a single file to this patch.
 	 * <p>
 	 * Typically files should be added by parsing the text through one of this
 	 * class's parse methods.
 	 *
 	 * @param fh
 	 *            the header of the file.
 	 */
 	public void addFile(FileHeader fh) {
 		files.add(fh);
 	}

 	/**
 	 * Get list of files described in the patch, in occurrence order.
 	 *
 	 * @return list of files described in the patch, in occurrence order.
 	 */
 	public List<? extends FileHeader> getFiles() {
 		return files;
 	}

 	/**
 	 * Add a formatting error to this patch script.
 	 *
 	 * @param err
 	 *            the error description.
 	 */
 	public void addError(FormatError err) {
 		errors.add(err);
 	}

 	/**
 	 * Get collection of formatting errors.
 	 *
 	 * @return collection of formatting errors, if any.
 	 */
 	public List<FormatError> getErrors() {
 		return errors;
 	}

 	/**
 	 * Parse a patch received from an InputStream.
 	 * <p>
 	 * Multiple parse calls on the same instance will concatenate the patch
 	 * data, but each parse input must start with a valid file header (don't
 	 * split a single file across parse calls).
 	 *
 	 * @param is
 	 *            the stream to read the patch data from. The stream is read
 	 *            until EOF is reached.
 	 * @throws java.io.IOException
 	 *             there was an error reading from the input stream.
 	 */
 	public void parse(InputStream is) throws IOException {
 		final byte[] buf = readFully(is);
 		parse(buf, 0, buf.length);
 	}

 	private static byte[] readFully(InputStream is) throws IOException {
 		try (TemporaryBuffer b = new TemporaryBuffer.Heap(Integer.MAX_VALUE)) {
 			b.copy(is);
 			return b.toByteArray();
 		}
 	}

 	/**
 	 * Parse a patch stored in a byte[].
 	 * <p>
 	 * Multiple parse calls on the same instance will concatenate the patch
 	 * data, but each parse input must start with a valid file header (don't
 	 * split a single file across parse calls).
 	 *
 	 * @param buf
 	 *            the buffer to parse.
 	 * @param ptr
 	 *            starting position to parse from.
 	 * @param end
 	 *            1 past the last position to end parsing. The total length to
 	 *            be parsed is <code>end - ptr</code>.
 	 */
 	public void parse(byte[] buf, int ptr, int end) {
 		while (ptr < end)
 			ptr = parseFile(buf, ptr, end);
 	}

 	private int parseFile(byte[] buf, int c, int end) {
 		while (c < end) {
 			if (isHunkHdr(buf, c, end) >= 1) {
 				// If we find a disconnected hunk header we might
 				// have missed a file header previously. The hunk
 				// isn't valid without knowing where it comes from.
 				//
 				error(buf, c, JGitText.get().hunkDisconnectedFromFile);
 				c = nextLF(buf, c);
 				continue;
 			}

 			// Valid git style patch?
 			//
 			if (match(buf, c, DIFF_GIT) >= 0)
 				return parseDiffGit(buf, c, end);
 			if (match(buf, c, DIFF_CC) >= 0)
 				return parseDiffCombined(DIFF_CC, buf, c, end);
 			if (match(buf, c, DIFF_COMBINED) >= 0)
 				return parseDiffCombined(DIFF_COMBINED, buf, c, end);

 			// Junk between files? Leading junk? Traditional
 			// (non-git generated) patch?
 			//
 			final int n = nextLF(buf, c);
 			if (n >= end) {
 				// Patches cannot be only one line long. This must be
 				// trailing junk that we should ignore.
 				//
 				return end;
 			}

 			if (n - c < 6) {
 				// A valid header must be at least 6 bytes on the
 				// first line, e.g. "--- a/b\n".
 				//
 				c = n;
 				continue;
 			}

 			if (match(buf, c, OLD_NAME) >= 0 && match(buf, n, NEW_NAME) >= 0) {
 				// Probably a traditional patch. Ensure we have at least
 				// a "@@ -0,0" smelling line next. We only check the "@@ -".
 				//
 				final int f = nextLF(buf, n);
 				if (f >= end)
 					return end;
 				if (isHunkHdr(buf, f, end) == 1)
 					return parseTraditionalPatch(buf, c, end);
 			}

 			c = n;
 		}
 		return c;
 	}

 	private int parseDiffGit(byte[] buf, int start, int end) {
 		final FileHeader fh = new FileHeader(buf, start);
 		int ptr = fh.parseGitFileName(start + DIFF_GIT.length, end);
 		if (ptr < 0)
 			return skipFile(buf, start);

 		ptr = fh.parseGitHeaders(ptr, end);
 		ptr = parseHunks(fh, ptr, end);
 		fh.endOffset = ptr;
 		addFile(fh);
 		return ptr;
 	}

 	private int parseDiffCombined(final byte[] hdr, final byte[] buf,
 			final int start, final int end) {
 		final CombinedFileHeader fh = new CombinedFileHeader(buf, start);
 		int ptr = fh.parseGitFileName(start + hdr.length, end);
 		if (ptr < 0)
 			return skipFile(buf, start);

 		ptr = fh.parseGitHeaders(ptr, end);
 		ptr = parseHunks(fh, ptr, end);
 		fh.endOffset = ptr;
 		addFile(fh);
 		return ptr;
 	}

 	private int parseTraditionalPatch(final byte[] buf, final int start,
 			final int end) {
 		final FileHeader fh = new FileHeader(buf, start);
 		int ptr = fh.parseTraditionalHeaders(start, end);
 		ptr = parseHunks(fh, ptr, end);
 		fh.endOffset = ptr;
 		addFile(fh);
 		return ptr;
 	}

 	private static int skipFile(byte[] buf, int ptr) {
 		ptr = nextLF(buf, ptr);
 		if (match(buf, ptr, OLD_NAME) >= 0)
 			ptr = nextLF(buf, ptr);
 		return ptr;
 	}

 	private int parseHunks(FileHeader fh, int c, int end) {
 		final byte[] buf = fh.buf;
 		while (c < end) {
 			// If we see a file header at this point, we have all of the
 			// hunks for our current file. We should stop and report back
 			// with this position so it can be parsed again later.
 			//
 			if (match(buf, c, DIFF_GIT) >= 0)
 				break;
 			if (match(buf, c, DIFF_CC) >= 0)
 				break;
 			if (match(buf, c, DIFF_COMBINED) >= 0)
 				break;
 			if (match(buf, c, OLD_NAME) >= 0)
 				break;
 			if (match(buf, c, NEW_NAME) >= 0)
 				break;

 			if (isHunkHdr(buf, c, end) == fh.getParentCount()) {
 				final HunkHeader h = fh.newHunkHeader(c);
 				h.parseHeader();
 				c = h.parseBody(this, end);
 				h.endOffset = c;
 				fh.addHunk(h);
 				if (c < end) {
 					switch (buf[c]) {
 					case '@':
 					case 'd':
 					case '\n':
 						break;
 					default:
 						if (match(buf, c, SIG_FOOTER) < 0)
 							warn(buf, c, JGitText.get().unexpectedHunkTrailer);
 					}
 				}
 				continue;
 			}

 			final int eol = nextLF(buf, c);
 			if (fh.getHunks().isEmpty() && match(buf, c, GIT_BINARY) >= 0) {
 				fh.patchType = FileHeader.PatchType.GIT_BINARY;
 				return parseGitBinary(fh, eol, end);
 			}

 			if (fh.getHunks().isEmpty() && BIN_TRAILER.length < eol - c
 					&& match(buf, eol - BIN_TRAILER.length, BIN_TRAILER) >= 0
 					&& matchAny(buf, c, BIN_HEADERS)) {
 				// The patch is a binary file diff, with no deltas.
 				//
 				fh.patchType = FileHeader.PatchType.BINARY;
 				return eol;
 			}

 			// Skip this line and move to the next. Its probably garbage
 			// after the last hunk of a file.
 			//
 			c = eol;
 		}

 		if (fh.getHunks().isEmpty()
 				&& fh.getPatchType() == FileHeader.PatchType.UNIFIED
 				&& !fh.hasMetaDataChanges()) {
 			// Hmm, an empty patch? If there is no metadata here we
 			// really have a binary patch that we didn't notice above.
 			//
 			fh.patchType = FileHeader.PatchType.BINARY;
 		}

 		return c;
 	}

 	private int parseGitBinary(FileHeader fh, int c, int end) {
 		final BinaryHunk postImage = new BinaryHunk(fh, c);
 		final int nEnd = postImage.parseHunk(c, end);
 		if (nEnd < 0) {
 			// Not a binary hunk.
 			//
 			error(fh.buf, c, JGitText.get().missingForwardImageInGITBinaryPatch);
 			return c;
 		}
 		c = nEnd;
 		postImage.endOffset = c;
 		fh.forwardBinaryHunk = postImage;

 		final BinaryHunk preImage = new BinaryHunk(fh, c);
 		final int oEnd = preImage.parseHunk(c, end);
 		if (oEnd >= 0) {
 			c = oEnd;
 			preImage.endOffset = c;
 			fh.reverseBinaryHunk = preImage;
 		}

 		return c;
 	}

 	void warn(byte[] buf, int ptr, String msg) {
 		addError(new FormatError(buf, ptr, FormatError.Severity.WARNING, msg));
 	}

 	void error(byte[] buf, int ptr, String msg) {
 		addError(new FormatError(buf, ptr, FormatError.Severity.ERROR, msg));
 	}

 	private static boolean matchAny(final byte[] buf, final int c,
 			final byte[][] srcs) {
 		for (byte[] s : srcs) {
 			if (match(buf, c, s) >= 0)
 				return true;
 		}
 		return false;
 	}
 }
	/*
	* Copyright (C) 2008-2009, Google Inc.
	* 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.patch;

	import static org.eclipse.jgit.lib.Constants.encodeASCII;
	import static org.eclipse.jgit.patch.FileHeader.NEW_NAME;
	import static org.eclipse.jgit.patch.FileHeader.OLD_NAME;
	import static org.eclipse.jgit.patch.FileHeader.isHunkHdr;
	import static org.eclipse.jgit.util.RawParseUtils.match;
	import static org.eclipse.jgit.util.RawParseUtils.nextLF;

	import java.io.IOException;
	import java.io.InputStream;
	import java.util.ArrayList;
	import java.util.List;

	import org.eclipse.jgit.internal.JGitText;
	import org.eclipse.jgit.util.TemporaryBuffer;

	/**
	* A parsed collection of {@link org.eclipse.jgit.patch.FileHeader}s from a
	* unified diff patch file
	*/
	public class Patch {
	static final byte[] DIFF_GIT = encodeASCII("diff --git "); //$NON-NLS-1$

	private static final byte[] DIFF_CC = encodeASCII("diff --cc "); //$NON-NLS-1$

	private static final byte[] DIFF_COMBINED = encodeASCII("diff --combined "); //$NON-NLS-1$

	private static final byte[][] BIN_HEADERS = new byte[][] {
	encodeASCII("Binary files "), encodeASCII("Files "), }; //$NON-NLS-1$ //$NON-NLS-2$

	private static final byte[] BIN_TRAILER = encodeASCII(" differ\n"); //$NON-NLS-1$

	private static final byte[] GIT_BINARY = encodeASCII("GIT binary patch\n"); //$NON-NLS-1$

	static final byte[] SIG_FOOTER = encodeASCII("-- \n"); //$NON-NLS-1$

	/** The files, in the order they were parsed out of the input. */
	private final List<FileHeader> files;

	/** Formatting errors, if any were identified. */
	private final List<FormatError> errors;

	/**
	* Create an empty patch.
	*/
	public Patch() {
	files = new ArrayList<>();
	errors = new ArrayList<>(0);
	}

	/**
	* Add a single file to this patch.
	* <p>
	* Typically files should be added by parsing the text through one of this
	* class's parse methods.
	*
	* @param fh
	* the header of the file.
	*/
	public void addFile(FileHeader fh) {
	files.add(fh);
	}

	/**
	* Get list of files described in the patch, in occurrence order.
	*
	* @return list of files described in the patch, in occurrence order.
	*/
	public List<? extends FileHeader> getFiles() {
	return files;
	}

	/**
	* Add a formatting error to this patch script.
	*
	* @param err
	* the error description.
	*/
	public void addError(FormatError err) {
	errors.add(err);
	}

	/**
	* Get collection of formatting errors.
	*
	* @return collection of formatting errors, if any.
	*/
	public List<FormatError> getErrors() {
	return errors;
	}

	/**
	* Parse a patch received from an InputStream.
	* <p>
	* Multiple parse calls on the same instance will concatenate the patch
	* data, but each parse input must start with a valid file header (don't
	* split a single file across parse calls).
	*
	* @param is
	* the stream to read the patch data from. The stream is read
	* until EOF is reached.
	* @throws java.io.IOException
	* there was an error reading from the input stream.
	*/
	public void parse(InputStream is) throws IOException {
	final byte[] buf = readFully(is);
	parse(buf, 0, buf.length);
	}

	private static byte[] readFully(InputStream is) throws IOException {
	try (TemporaryBuffer b = new TemporaryBuffer.Heap(Integer.MAX_VALUE)) {
	b.copy(is);
	return b.toByteArray();
	}
	}

	/**
	* Parse a patch stored in a byte[].
	* <p>
	* Multiple parse calls on the same instance will concatenate the patch
	* data, but each parse input must start with a valid file header (don't
	* split a single file across parse calls).
	*
	* @param buf
	* the buffer to parse.
	* @param ptr
	* starting position to parse from.
	* @param end
	* 1 past the last position to end parsing. The total length to
	* be parsed is <code>end - ptr</code>.
	*/
	public void parse(byte[] buf, int ptr, int end) {
	while (ptr < end)
	ptr = parseFile(buf, ptr, end);
	}

	private int parseFile(byte[] buf, int c, int end) {
	while (c < end) {
	if (isHunkHdr(buf, c, end) >= 1) {
	// If we find a disconnected hunk header we might
	// have missed a file header previously. The hunk
	// isn't valid without knowing where it comes from.
	//
	error(buf, c, JGitText.get().hunkDisconnectedFromFile);
	c = nextLF(buf, c);
	continue;
	}

	// Valid git style patch?
	//
	if (match(buf, c, DIFF_GIT) >= 0)
	return parseDiffGit(buf, c, end);
	if (match(buf, c, DIFF_CC) >= 0)
	return parseDiffCombined(DIFF_CC, buf, c, end);
	if (match(buf, c, DIFF_COMBINED) >= 0)
	return parseDiffCombined(DIFF_COMBINED, buf, c, end);

	// Junk between files? Leading junk? Traditional
	// (non-git generated) patch?
	//
	final int n = nextLF(buf, c);
	if (n >= end) {
	// Patches cannot be only one line long. This must be
	// trailing junk that we should ignore.
	//
	return end;
	}

	if (n - c < 6) {
	// A valid header must be at least 6 bytes on the
	// first line, e.g. "--- a/b\n".
	//
	c = n;
	continue;
	}

	if (match(buf, c, OLD_NAME) >= 0 && match(buf, n, NEW_NAME) >= 0) {
	// Probably a traditional patch. Ensure we have at least
	// a "@@ -0,0" smelling line next. We only check the "@@ -".
	//
	final int f = nextLF(buf, n);
	if (f >= end)
	return end;
	if (isHunkHdr(buf, f, end) == 1)
	return parseTraditionalPatch(buf, c, end);
	}

	c = n;
	}
	return c;
	}

	private int parseDiffGit(byte[] buf, int start, int end) {
	final FileHeader fh = new FileHeader(buf, start);
	int ptr = fh.parseGitFileName(start + DIFF_GIT.length, end);
	if (ptr < 0)
	return skipFile(buf, start);

	ptr = fh.parseGitHeaders(ptr, end);
	ptr = parseHunks(fh, ptr, end);
	fh.endOffset = ptr;
	addFile(fh);
	return ptr;
	}

	private int parseDiffCombined(final byte[] hdr, final byte[] buf,
	final int start, final int end) {
	final CombinedFileHeader fh = new CombinedFileHeader(buf, start);
	int ptr = fh.parseGitFileName(start + hdr.length, end);
	if (ptr < 0)
	return skipFile(buf, start);

	ptr = fh.parseGitHeaders(ptr, end);
	ptr = parseHunks(fh, ptr, end);
	fh.endOffset = ptr;
	addFile(fh);
	return ptr;
	}

	private int parseTraditionalPatch(final byte[] buf, final int start,
	final int end) {
	final FileHeader fh = new FileHeader(buf, start);
	int ptr = fh.parseTraditionalHeaders(start, end);
	ptr = parseHunks(fh, ptr, end);
	fh.endOffset = ptr;
	addFile(fh);
	return ptr;
	}

	private static int skipFile(byte[] buf, int ptr) {
	ptr = nextLF(buf, ptr);
	if (match(buf, ptr, OLD_NAME) >= 0)
	ptr = nextLF(buf, ptr);
	return ptr;
	}

	private int parseHunks(FileHeader fh, int c, int end) {
	final byte[] buf = fh.buf;
	while (c < end) {
	// If we see a file header at this point, we have all of the
	// hunks for our current file. We should stop and report back
	// with this position so it can be parsed again later.
	//
	if (match(buf, c, DIFF_GIT) >= 0)
	break;
	if (match(buf, c, DIFF_CC) >= 0)
	break;
	if (match(buf, c, DIFF_COMBINED) >= 0)
	break;
	if (match(buf, c, OLD_NAME) >= 0)
	break;
	if (match(buf, c, NEW_NAME) >= 0)
	break;

	if (isHunkHdr(buf, c, end) == fh.getParentCount()) {
	final HunkHeader h = fh.newHunkHeader(c);
	h.parseHeader();
	c = h.parseBody(this, end);
	h.endOffset = c;
	fh.addHunk(h);
	if (c < end) {
	switch (buf[c]) {
	case '@':
	case 'd':
	case '\n':
	break;
	default:
	if (match(buf, c, SIG_FOOTER) < 0)
	warn(buf, c, JGitText.get().unexpectedHunkTrailer);
	}
	}
	continue;
	}

	final int eol = nextLF(buf, c);
	if (fh.getHunks().isEmpty() && match(buf, c, GIT_BINARY) >= 0) {
	fh.patchType = FileHeader.PatchType.GIT_BINARY;
	return parseGitBinary(fh, eol, end);
	}

	if (fh.getHunks().isEmpty() && BIN_TRAILER.length < eol - c
	&& match(buf, eol - BIN_TRAILER.length, BIN_TRAILER) >= 0
	&& matchAny(buf, c, BIN_HEADERS)) {
	// The patch is a binary file diff, with no deltas.
	//
	fh.patchType = FileHeader.PatchType.BINARY;
	return eol;
	}

	// Skip this line and move to the next. Its probably garbage
	// after the last hunk of a file.
	//
	c = eol;
	}

	if (fh.getHunks().isEmpty()
	&& fh.getPatchType() == FileHeader.PatchType.UNIFIED
	&& !fh.hasMetaDataChanges()) {
	// Hmm, an empty patch? If there is no metadata here we
	// really have a binary patch that we didn't notice above.
	//
	fh.patchType = FileHeader.PatchType.BINARY;
	}

	return c;
	}

	private int parseGitBinary(FileHeader fh, int c, int end) {
	final BinaryHunk postImage = new BinaryHunk(fh, c);
	final int nEnd = postImage.parseHunk(c, end);
	if (nEnd < 0) {
	// Not a binary hunk.
	//
	error(fh.buf, c, JGitText.get().missingForwardImageInGITBinaryPatch);
	return c;
	}
	c = nEnd;
	postImage.endOffset = c;
	fh.forwardBinaryHunk = postImage;

	final BinaryHunk preImage = new BinaryHunk(fh, c);
	final int oEnd = preImage.parseHunk(c, end);
	if (oEnd >= 0) {
	c = oEnd;
	preImage.endOffset = c;
	fh.reverseBinaryHunk = preImage;
	}

	return c;
	}

	void warn(byte[] buf, int ptr, String msg) {
	addError(new FormatError(buf, ptr, FormatError.Severity.WARNING, msg));
	}

	void error(byte[] buf, int ptr, String msg) {
	addError(new FormatError(buf, ptr, FormatError.Severity.ERROR, msg));
	}

	private static boolean matchAny(final byte[] buf, final int c,
	final byte[][] srcs) {
	for (byte[] s : srcs) {
	if (match(buf, c, s) >= 0)
	return true;
	}
	return false;
	}
	}