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/*
* Copyright (C) 2016, Christian Halstrick <christian.halstrick@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lfs;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.util.Locale;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.lfs.lib.AnyLongObjectId;
import org.eclipse.jgit.lfs.lib.Constants;
import org.eclipse.jgit.lfs.lib.LongObjectId;
/**
* Represents an LFS pointer file
*
* @since 4.6
*/
public class LfsPointer implements Comparable<LfsPointer> {
/**
* The version of the LfsPointer file format
*/
public static final String VERSION = "https://git-lfs.github.com/spec/v1"; //$NON-NLS-1$
/**
* The version of the LfsPointer file format using legacy URL
* @since 4.7
*/
public static final String VERSION_LEGACY = "https://hawser.github.com/spec/v1"; //$NON-NLS-1$
/**
* Don't inspect files that are larger than this threshold to avoid
* excessive reading. No pointer file should be larger than this.
* @since 4.11
*/
public static final int SIZE_THRESHOLD = 200;
/**
* The name of the hash function as used in the pointer files. This will
* evaluate to "sha256"
*/
public static final String HASH_FUNCTION_NAME = Constants.LONG_HASH_FUNCTION
.toLowerCase(Locale.ROOT).replace("-", ""); //$NON-NLS-1$ //$NON-NLS-2$
private AnyLongObjectId oid;
private long size;
/**
* <p>Constructor for LfsPointer.</p>
*
* @param oid
* the id of the content
* @param size
* the size of the content
*/
public LfsPointer(AnyLongObjectId oid, long size) {
this.oid = oid;
this.size = size;
}
/**
* <p>Getter for the field <code>oid</code>.</p>
*
* @return the id of the content
*/
public AnyLongObjectId getOid() {
return oid;
}
/**
* <p>Getter for the field <code>size</code>.</p>
*
* @return the size of the content
*/
public long getSize() {
return size;
}
/**
* Encode this object into the LFS format defined by {@link #VERSION}
*
* @param out
* the {@link java.io.OutputStream} into which the encoded data should be
* written
*/
public void encode(OutputStream out) {
try (PrintStream ps = new PrintStream(out, false,
UTF_8.name())) {
ps.print("version "); //$NON-NLS-1$
ps.print(VERSION + "\n"); //$NON-NLS-1$
ps.print("oid " + HASH_FUNCTION_NAME + ":"); //$NON-NLS-1$ //$NON-NLS-2$
ps.print(oid.name() + "\n"); //$NON-NLS-1$
ps.print("size "); //$NON-NLS-1$
ps.print(size + "\n"); //$NON-NLS-1$
} catch (UnsupportedEncodingException e) {
// should not happen, we are using a standard charset
}
}
/**
* Try to parse the data provided by an InputStream to the format defined by
* {@link #VERSION}
*
* @param in
* the {@link java.io.InputStream} from where to read the data
* @return an {@link org.eclipse.jgit.lfs.LfsPointer} or <code>null</code>
* if the stream was not parseable as LfsPointer
* @throws java.io.IOException
*/
@Nullable
public static LfsPointer parseLfsPointer(InputStream in)
throws IOException {
boolean versionLine = false;
LongObjectId id = null;
long sz = -1;
try (BufferedReader br = new BufferedReader(
new InputStreamReader(in, UTF_8))) {
for (String s = br.readLine(); s != null; s = br.readLine()) {
if (s.startsWith("#") || s.length() == 0) { //$NON-NLS-1$
continue;
} else if (s.startsWith("version") && s.length() > 8 //$NON-NLS-1$
&& (s.substring(8).trim().equals(VERSION) ||
s.substring(8).trim().equals(VERSION_LEGACY))) {
versionLine = true;
} else if (s.startsWith("oid sha256:")) { //$NON-NLS-1$
id = LongObjectId.fromString(s.substring(11).trim());
} else if (s.startsWith("size") && s.length() > 5) { //$NON-NLS-1$
sz = Long.parseLong(s.substring(5).trim());
}
}
if (versionLine && id != null && sz > -1) {
return new LfsPointer(id, sz);
}
}
return null;
}
/** {@inheritDoc} */
@Override
public String toString() {
return "LfsPointer: oid=" + oid.name() + ", size=" //$NON-NLS-1$ //$NON-NLS-2$
+ size;
}
/**
* @since 4.11
*/
@Override
public int compareTo(LfsPointer o) {
int x = getOid().compareTo(o.getOid());
if (x != 0) {
return x;
}
return Long.compare(getSize(), o.getSize());
}
}
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