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102 lines
3.6 KiB
102 lines
3.6 KiB
/* |
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* Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php |
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.lfs.lib; |
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import java.security.MessageDigest; |
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import java.security.NoSuchAlgorithmException; |
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import java.text.MessageFormat; |
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import org.eclipse.jgit.lfs.internal.LfsText; |
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/** |
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* Misc. constants used throughout JGit LFS extension. |
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* |
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* @since 4.3 |
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**/ |
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@SuppressWarnings("nls") |
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public final class Constants { |
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/** Hash function used natively by Git LFS extension for large objects. */ |
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private static final String LONG_HASH_FUNCTION = "SHA-256"; |
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/** |
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* A Git LFS large object hash is 256 bits, i.e. 32 bytes. |
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* <p> |
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* Changing this assumption is not going to be as easy as changing this |
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* declaration. |
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*/ |
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public static final int LONG_OBJECT_ID_LENGTH = 32; |
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/** |
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* A Git LFS large object can be expressed as a 64 character string of |
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* hexadecimal digits. |
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* |
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* @see #LONG_OBJECT_ID_LENGTH |
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*/ |
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public static final int LONG_OBJECT_ID_STRING_LENGTH = LONG_OBJECT_ID_LENGTH |
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* 2; |
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/** |
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* Create a new digest function for objects. |
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* |
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* @return a new digest object. |
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* @throws RuntimeException |
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* this Java virtual machine does not support the required hash |
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* function. Very unlikely given that JGit uses a hash function |
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* that is in the Java reference specification. |
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*/ |
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public static MessageDigest newMessageDigest() { |
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try { |
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return MessageDigest.getInstance(LONG_HASH_FUNCTION); |
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} catch (NoSuchAlgorithmException nsae) { |
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throw new RuntimeException(MessageFormat.format( |
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LfsText.get().requiredHashFunctionNotAvailable, |
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LONG_HASH_FUNCTION), nsae); |
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} |
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} |
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static { |
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if (LONG_OBJECT_ID_LENGTH != newMessageDigest().getDigestLength()) |
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throw new LinkageError( |
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LfsText.get().incorrectLONG_OBJECT_ID_LENGTH); |
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} |
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}
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