DirCacheEntry.java
/*
* Copyright (C) 2008, 2009, Google Inc.
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
* Copyright (C) 2010, Matthias Sohn <matthias.sohn@sap.com>
* Copyright (C) 2010, 2020, 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.dircache;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.text.MessageFormat;
import java.time.Instant;
import java.util.Arrays;
import org.eclipse.jgit.dircache.DirCache.DirCacheVersion;
import org.eclipse.jgit.errors.CorruptObjectException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.util.IO;
import org.eclipse.jgit.util.MutableInteger;
import org.eclipse.jgit.util.NB;
import org.eclipse.jgit.util.SystemReader;
/**
* A single file (or stage of a file) in a
* {@link org.eclipse.jgit.dircache.DirCache}.
* <p>
* An entry represents exactly one stage of a file. If a file path is unmerged
* then multiple DirCacheEntry instances may appear for the same path name.
*/
public class DirCacheEntry {
private static final byte[] nullpad = new byte[8];
/** The standard (fully merged) stage for an entry. */
public static final int STAGE_0 = 0;
/** The base tree revision for an entry. */
public static final int STAGE_1 = 1;
/** The first tree revision (usually called "ours"). */
public static final int STAGE_2 = 2;
/** The second tree revision (usually called "theirs"). */
public static final int STAGE_3 = 3;
private static final int P_CTIME = 0;
// private static final int P_CTIME_NSEC = 4;
private static final int P_MTIME = 8;
// private static final int P_MTIME_NSEC = 12;
// private static final int P_DEV = 16;
// private static final int P_INO = 20;
private static final int P_MODE = 24;
// private static final int P_UID = 28;
// private static final int P_GID = 32;
private static final int P_SIZE = 36;
private static final int P_OBJECTID = 40;
private static final int P_FLAGS = 60;
private static final int P_FLAGS2 = 62;
/** Mask applied to data in {@link #P_FLAGS} to get the name length. */
private static final int NAME_MASK = 0xfff;
private static final int INTENT_TO_ADD = 0x20000000;
private static final int SKIP_WORKTREE = 0x40000000;
private static final int EXTENDED_FLAGS = (INTENT_TO_ADD | SKIP_WORKTREE);
private static final int INFO_LEN = 62;
private static final int INFO_LEN_EXTENDED = 64;
private static final int EXTENDED = 0x40;
private static final int ASSUME_VALID = 0x80;
/** In-core flag signaling that the entry should be considered as modified. */
private static final int UPDATE_NEEDED = 0x1;
/** (Possibly shared) header information storage. */
private final byte[] info;
/** First location within {@link #info} where our header starts. */
private final int infoOffset;
/** Our encoded path name, from the root of the repository. */
final byte[] path;
/** Flags which are never stored to disk. */
private byte inCoreFlags;
DirCacheEntry(byte[] sharedInfo, MutableInteger infoAt, InputStream in,
MessageDigest md, Instant smudge, DirCacheVersion version,
DirCacheEntry previous)
throws IOException {
info = sharedInfo;
infoOffset = infoAt.value;
IO.readFully(in, info, infoOffset, INFO_LEN);
int len;
if (isExtended()) {
len = INFO_LEN_EXTENDED;
IO.readFully(in, info, infoOffset + INFO_LEN, INFO_LEN_EXTENDED - INFO_LEN);
if ((getExtendedFlags() & ~EXTENDED_FLAGS) != 0)
throw new IOException(MessageFormat.format(JGitText.get()
.DIRCUnrecognizedExtendedFlags, String.valueOf(getExtendedFlags())));
} else
len = INFO_LEN;
infoAt.value += len;
md.update(info, infoOffset, len);
int toRemove = 0;
if (version == DirCacheVersion.DIRC_VERSION_PATHCOMPRESS) {
// Read variable int and update digest
int b = in.read();
md.update((byte) b);
toRemove = b & 0x7F;
while ((b & 0x80) != 0) {
toRemove++;
b = in.read();
md.update((byte) b);
toRemove = (toRemove << 7) | (b & 0x7F);
}
if (toRemove < 0
|| (previous != null && toRemove > previous.path.length)) {
if (previous == null) {
throw new IOException(MessageFormat.format(
JGitText.get().DIRCCorruptLengthFirst,
Integer.valueOf(toRemove)));
}
throw new IOException(MessageFormat.format(
JGitText.get().DIRCCorruptLength,
Integer.valueOf(toRemove), previous.getPathString()));
}
}
int pathLen = NB.decodeUInt16(info, infoOffset + P_FLAGS) & NAME_MASK;
int skipped = 0;
if (pathLen < NAME_MASK) {
path = new byte[pathLen];
if (version == DirCacheVersion.DIRC_VERSION_PATHCOMPRESS
&& previous != null) {
System.arraycopy(previous.path, 0, path, 0,
previous.path.length - toRemove);
IO.readFully(in, path, previous.path.length - toRemove,
pathLen - (previous.path.length - toRemove));
md.update(path, previous.path.length - toRemove,
pathLen - (previous.path.length - toRemove));
pathLen = pathLen - (previous.path.length - toRemove);
} else {
IO.readFully(in, path, 0, pathLen);
md.update(path, 0, pathLen);
}
} else if (version != DirCacheVersion.DIRC_VERSION_PATHCOMPRESS
|| previous == null || toRemove == previous.path.length) {
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
byte[] buf = new byte[NAME_MASK];
IO.readFully(in, buf, 0, NAME_MASK);
tmp.write(buf);
readNulTerminatedString(in, tmp);
path = tmp.toByteArray();
pathLen = path.length;
md.update(path, 0, pathLen);
skipped = 1; // we already skipped 1 '\0' in readNulTerminatedString
md.update((byte) 0);
} else {
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
tmp.write(previous.path, 0, previous.path.length - toRemove);
pathLen = readNulTerminatedString(in, tmp);
path = tmp.toByteArray();
md.update(path, previous.path.length - toRemove, pathLen);
skipped = 1; // we already skipped 1 '\0' in readNulTerminatedString
md.update((byte) 0);
}
try {
checkPath(path);
} catch (InvalidPathException e) {
CorruptObjectException p =
new CorruptObjectException(e.getMessage());
if (e.getCause() != null)
p.initCause(e.getCause());
throw p;
}
if (version == DirCacheVersion.DIRC_VERSION_PATHCOMPRESS) {
if (skipped == 0) {
int b = in.read();
if (b < 0) {
throw new EOFException(JGitText.get().shortReadOfBlock);
}
md.update((byte) b);
}
} else {
// Index records are padded out to the next 8 byte alignment
// for historical reasons related to how C Git read the files.
//
final int actLen = len + pathLen;
final int expLen = (actLen + 8) & ~7;
final int padLen = expLen - actLen - skipped;
if (padLen > 0) {
IO.skipFully(in, padLen);
md.update(nullpad, 0, padLen);
}
}
if (mightBeRacilyClean(smudge)) {
smudgeRacilyClean();
}
}
/**
* Create an empty entry at stage 0.
*
* @param newPath
* name of the cache entry.
* @throws java.lang.IllegalArgumentException
* If the path starts or ends with "/", or contains "//" either
* "\0". These sequences are not permitted in a git tree object
* or DirCache file.
*/
public DirCacheEntry(String newPath) {
this(Constants.encode(newPath), STAGE_0);
}
/**
* Create an empty entry at the specified stage.
*
* @param newPath
* name of the cache entry.
* @param stage
* the stage index of the new entry.
* @throws java.lang.IllegalArgumentException
* If the path starts or ends with "/", or contains "//" either
* "\0". These sequences are not permitted in a git tree object
* or DirCache file. Or if {@code stage} is outside of the
* range 0..3, inclusive.
*/
public DirCacheEntry(String newPath, int stage) {
this(Constants.encode(newPath), stage);
}
/**
* Create an empty entry at stage 0.
*
* @param newPath
* name of the cache entry, in the standard encoding.
* @throws java.lang.IllegalArgumentException
* If the path starts or ends with "/", or contains "//" either
* "\0". These sequences are not permitted in a git tree object
* or DirCache file.
*/
public DirCacheEntry(byte[] newPath) {
this(newPath, STAGE_0);
}
/**
* Create an empty entry at the specified stage.
*
* @param path
* name of the cache entry, in the standard encoding.
* @param stage
* the stage index of the new entry.
* @throws java.lang.IllegalArgumentException
* If the path starts or ends with "/", or contains "//" either
* "\0". These sequences are not permitted in a git tree object
* or DirCache file. Or if {@code stage} is outside of the
* range 0..3, inclusive.
*/
@SuppressWarnings("boxing")
public DirCacheEntry(byte[] path, int stage) {
checkPath(path);
if (stage < 0 || 3 < stage)
throw new IllegalArgumentException(MessageFormat.format(
JGitText.get().invalidStageForPath,
stage, toString(path)));
info = new byte[INFO_LEN];
infoOffset = 0;
this.path = path;
int flags = ((stage & 0x3) << 12);
if (path.length < NAME_MASK)
flags |= path.length;
else
flags |= NAME_MASK;
NB.encodeInt16(info, infoOffset + P_FLAGS, flags);
}
/**
* Duplicate DirCacheEntry with same path and copied info.
* <p>
* The same path buffer is reused (avoiding copying), however a new info
* buffer is created and its contents are copied.
*
* @param src
* entry to clone.
* @since 4.2
*/
public DirCacheEntry(DirCacheEntry src) {
path = src.path;
info = new byte[INFO_LEN];
infoOffset = 0;
System.arraycopy(src.info, src.infoOffset, info, 0, INFO_LEN);
}
private int readNulTerminatedString(InputStream in, OutputStream out)
throws IOException {
int n = 0;
for (;;) {
int c = in.read();
if (c < 0) {
throw new EOFException(JGitText.get().shortReadOfBlock);
}
if (c == 0) {
break;
}
out.write(c);
n++;
}
return n;
}
void write(OutputStream os, DirCacheVersion version, DirCacheEntry previous)
throws IOException {
final int len = isExtended() ? INFO_LEN_EXTENDED : INFO_LEN;
if (version != DirCacheVersion.DIRC_VERSION_PATHCOMPRESS) {
os.write(info, infoOffset, len);
os.write(path, 0, path.length);
// Index records are padded out to the next 8 byte alignment
// for historical reasons related to how C Git read the files.
//
int entryLen = len + path.length;
int expLen = (entryLen + 8) & ~7;
if (entryLen != expLen)
os.write(nullpad, 0, expLen - entryLen);
} else {
int pathCommon = 0;
int toRemove;
if (previous != null) {
// Figure out common prefix
int pathLen = Math.min(path.length, previous.path.length);
while (pathCommon < pathLen
&& path[pathCommon] == previous.path[pathCommon]) {
pathCommon++;
}
toRemove = previous.path.length - pathCommon;
} else {
toRemove = 0;
}
byte[] tmp = new byte[16];
int n = tmp.length;
tmp[--n] = (byte) (toRemove & 0x7F);
while ((toRemove >>>= 7) != 0) {
tmp[--n] = (byte) (0x80 | (--toRemove & 0x7F));
}
os.write(info, infoOffset, len);
os.write(tmp, n, tmp.length - n);
os.write(path, pathCommon, path.length - pathCommon);
os.write(0);
}
}
/**
* Is it possible for this entry to be accidentally assumed clean?
* <p>
* The "racy git" problem happens when a work file can be updated faster
* than the filesystem records file modification timestamps. It is possible
* for an application to edit a work file, update the index, then edit it
* again before the filesystem will give the work file a new modification
* timestamp. This method tests to see if file was written out at the same
* time as the index.
*
* @param smudge_s
* seconds component of the index's last modified time.
* @param smudge_ns
* nanoseconds component of the index's last modified time.
* @return true if extra careful checks should be used.
* @deprecated use {@link #mightBeRacilyClean(Instant)} instead
*/
@Deprecated
public final boolean mightBeRacilyClean(int smudge_s, int smudge_ns) {
return mightBeRacilyClean(Instant.ofEpochSecond(smudge_s, smudge_ns));
}
/**
* Is it possible for this entry to be accidentally assumed clean?
* <p>
* The "racy git" problem happens when a work file can be updated faster
* than the filesystem records file modification timestamps. It is possible
* for an application to edit a work file, update the index, then edit it
* again before the filesystem will give the work file a new modification
* timestamp. This method tests to see if file was written out at the same
* time as the index.
*
* @param smudge
* index's last modified time.
* @return true if extra careful checks should be used.
* @since 5.1.9
*/
public final boolean mightBeRacilyClean(Instant smudge) {
// If the index has a modification time then it came from disk
// and was not generated from scratch in memory. In such cases
// the entry is 'racily clean' if the entry's cached modification
// time is equal to or later than the index modification time. In
// such cases the work file is too close to the index to tell if
// it is clean or not based on the modification time alone.
//
final int base = infoOffset + P_MTIME;
final int mtime = NB.decodeInt32(info, base);
if ((int) smudge.getEpochSecond() == mtime) {
return smudge.getNano() <= NB.decodeInt32(info, base + 4);
}
return false;
}
/**
* Force this entry to no longer match its working tree file.
* <p>
* This avoids the "racy git" problem by making this index entry no longer
* match the file in the working directory. Later git will be forced to
* compare the file content to ensure the file matches the working tree.
*/
public final void smudgeRacilyClean() {
// To mark an entry racily clean we set its length to 0 (like native git
// does). Entries which are not racily clean and have zero length can be
// distinguished from racily clean entries by checking P_OBJECTID
// against the SHA1 of empty content. When length is 0 and P_OBJECTID is
// different from SHA1 of empty content we know the entry is marked
// racily clean
final int base = infoOffset + P_SIZE;
Arrays.fill(info, base, base + 4, (byte) 0);
}
/**
* Check whether this entry has been smudged or not
* <p>
* If a blob has length 0 we know its id, see
* {@link org.eclipse.jgit.lib.Constants#EMPTY_BLOB_ID}. If an entry has
* length 0 and an ID different from the one for empty blob we know this
* entry was smudged.
*
* @return <code>true</code> if the entry is smudged, <code>false</code>
* otherwise
*/
public final boolean isSmudged() {
final int base = infoOffset + P_OBJECTID;
return (getLength() == 0) && (Constants.EMPTY_BLOB_ID.compareTo(info, base) != 0);
}
final byte[] idBuffer() {
return info;
}
final int idOffset() {
return infoOffset + P_OBJECTID;
}
/**
* Is this entry always thought to be unmodified?
* <p>
* Most entries in the index do not have this flag set. Users may however
* set them on if the file system stat() costs are too high on this working
* directory, such as on NFS or SMB volumes.
*
* @return true if we must assume the entry is unmodified.
*/
public boolean isAssumeValid() {
return (info[infoOffset + P_FLAGS] & ASSUME_VALID) != 0;
}
/**
* Set the assume valid flag for this entry,
*
* @param assume
* true to ignore apparent modifications; false to look at last
* modified to detect file modifications.
*/
public void setAssumeValid(boolean assume) {
if (assume)
info[infoOffset + P_FLAGS] |= (byte) ASSUME_VALID;
else
info[infoOffset + P_FLAGS] &= (byte) ~ASSUME_VALID;
}
/**
* Whether this entry should be checked for changes
*
* @return {@code true} if this entry should be checked for changes
*/
public boolean isUpdateNeeded() {
return (inCoreFlags & UPDATE_NEEDED) != 0;
}
/**
* Set whether this entry must be checked for changes
*
* @param updateNeeded
* whether this entry must be checked for changes
*/
public void setUpdateNeeded(boolean updateNeeded) {
if (updateNeeded)
inCoreFlags |= (byte) UPDATE_NEEDED;
else
inCoreFlags &= (byte) ~UPDATE_NEEDED;
}
/**
* Get the stage of this entry.
* <p>
* Entries have one of 4 possible stages: 0-3.
*
* @return the stage of this entry.
*/
public int getStage() {
return (info[infoOffset + P_FLAGS] >>> 4) & 0x3;
}
/**
* Sets the stage of an entry.
*
* @param stage
* to set, in the range [0..3]
* @throws IllegalArgumentException
* if the stage is outside the range [0..3]
* @since 5.10
*/
public void setStage(int stage) {
if ((stage & ~0x3) != 0) {
throw new IllegalArgumentException(
"Invalid stage, must be in range [0..3]"); //$NON-NLS-1$
}
byte flags = info[infoOffset + P_FLAGS];
info[infoOffset + P_FLAGS] = (byte) ((flags & 0xCF) | (stage << 4));
}
/**
* Returns whether this entry should be skipped from the working tree.
*
* @return true if this entry should be skipepd.
*/
public boolean isSkipWorkTree() {
return (getExtendedFlags() & SKIP_WORKTREE) != 0;
}
/**
* Returns whether this entry is intent to be added to the Index.
*
* @return true if this entry is intent to add.
*/
public boolean isIntentToAdd() {
return (getExtendedFlags() & INTENT_TO_ADD) != 0;
}
/**
* Returns whether this entry is in the fully-merged stage (0).
*
* @return true if this entry is merged
* @since 2.2
*/
public boolean isMerged() {
return getStage() == STAGE_0;
}
/**
* Obtain the raw {@link org.eclipse.jgit.lib.FileMode} bits for this entry.
*
* @return mode bits for the entry.
* @see FileMode#fromBits(int)
*/
public int getRawMode() {
return NB.decodeInt32(info, infoOffset + P_MODE);
}
/**
* Obtain the {@link org.eclipse.jgit.lib.FileMode} for this entry.
*
* @return the file mode singleton for this entry.
*/
public FileMode getFileMode() {
return FileMode.fromBits(getRawMode());
}
/**
* Set the file mode for this entry.
*
* @param mode
* the new mode constant.
* @throws java.lang.IllegalArgumentException
* If {@code mode} is
* {@link org.eclipse.jgit.lib.FileMode#MISSING},
* {@link org.eclipse.jgit.lib.FileMode#TREE}, or any other type
* code not permitted in a tree object.
*/
public void setFileMode(FileMode mode) {
switch (mode.getBits() & FileMode.TYPE_MASK) {
case FileMode.TYPE_MISSING:
case FileMode.TYPE_TREE:
throw new IllegalArgumentException(MessageFormat.format(
JGitText.get().invalidModeForPath, mode, getPathString()));
}
NB.encodeInt32(info, infoOffset + P_MODE, mode.getBits());
}
void setFileMode(int mode) {
NB.encodeInt32(info, infoOffset + P_MODE, mode);
}
/**
* Get the cached creation time of this file, in milliseconds.
*
* @return cached creation time of this file, in milliseconds since the
* Java epoch (midnight Jan 1, 1970 UTC).
*/
public long getCreationTime() {
return decodeTS(P_CTIME);
}
/**
* Set the cached creation time of this file, using milliseconds.
*
* @param when
* new cached creation time of the file, in milliseconds.
*/
public void setCreationTime(long when) {
encodeTS(P_CTIME, when);
}
/**
* Get the cached last modification date of this file, in milliseconds.
* <p>
* One of the indicators that the file has been modified by an application
* changing the working tree is if the last modification time for the file
* differs from the time stored in this entry.
*
* @return last modification time of this file, in milliseconds since the
* Java epoch (midnight Jan 1, 1970 UTC).
* @deprecated use {@link #getLastModifiedInstant()} instead
*/
@Deprecated
public long getLastModified() {
return decodeTS(P_MTIME);
}
/**
* Get the cached last modification date of this file.
* <p>
* One of the indicators that the file has been modified by an application
* changing the working tree is if the last modification time for the file
* differs from the time stored in this entry.
*
* @return last modification time of this file.
* @since 5.1.9
*/
public Instant getLastModifiedInstant() {
return decodeTSInstant(P_MTIME);
}
/**
* Set the cached last modification date of this file, using milliseconds.
*
* @param when
* new cached modification date of the file, in milliseconds.
* @deprecated use {@link #setLastModified(Instant)} instead
*/
@Deprecated
public void setLastModified(long when) {
encodeTS(P_MTIME, when);
}
/**
* Set the cached last modification date of this file.
*
* @param when
* new cached modification date of the file.
* @since 5.1.9
*/
public void setLastModified(Instant when) {
encodeTS(P_MTIME, when);
}
/**
* Get the cached size (mod 4 GB) (in bytes) of this file.
* <p>
* One of the indicators that the file has been modified by an application
* changing the working tree is if the size of the file (in bytes) differs
* from the size stored in this entry.
* <p>
* Note that this is the length of the file in the working directory, which
* may differ from the size of the decompressed blob if work tree filters
* are being used, such as LF<->CRLF conversion.
* <p>
* Note also that for very large files, this is the size of the on-disk file
* truncated to 32 bits, i.e. modulo 4294967296. If that value is larger
* than 2GB, it will appear negative.
*
* @return cached size of the working directory file, in bytes.
*/
public int getLength() {
return NB.decodeInt32(info, infoOffset + P_SIZE);
}
/**
* Set the cached size (in bytes) of this file.
*
* @param sz
* new cached size of the file, as bytes. If the file is larger
* than 2G, cast it to (int) before calling this method.
*/
public void setLength(int sz) {
NB.encodeInt32(info, infoOffset + P_SIZE, sz);
}
/**
* Set the cached size (in bytes) of this file.
*
* @param sz
* new cached size of the file, as bytes.
*/
public void setLength(long sz) {
setLength((int) sz);
}
/**
* Obtain the ObjectId for the entry.
* <p>
* Using this method to compare ObjectId values between entries is
* inefficient as it causes memory allocation.
*
* @return object identifier for the entry.
*/
public ObjectId getObjectId() {
return ObjectId.fromRaw(idBuffer(), idOffset());
}
/**
* Set the ObjectId for the entry.
*
* @param id
* new object identifier for the entry. May be
* {@link org.eclipse.jgit.lib.ObjectId#zeroId()} to remove the
* current identifier.
*/
public void setObjectId(AnyObjectId id) {
id.copyRawTo(idBuffer(), idOffset());
}
/**
* Set the ObjectId for the entry from the raw binary representation.
*
* @param bs
* the raw byte buffer to read from. At least 20 bytes after p
* must be available within this byte array.
* @param p
* position to read the first byte of data from.
*/
public void setObjectIdFromRaw(byte[] bs, int p) {
final int n = Constants.OBJECT_ID_LENGTH;
System.arraycopy(bs, p, idBuffer(), idOffset(), n);
}
/**
* Get the entry's complete path.
* <p>
* This method is not very efficient and is primarily meant for debugging
* and final output generation. Applications should try to avoid calling it,
* and if invoked do so only once per interesting entry, where the name is
* absolutely required for correct function.
*
* @return complete path of the entry, from the root of the repository. If
* the entry is in a subtree there will be at least one '/' in the
* returned string.
*/
public String getPathString() {
return toString(path);
}
/**
* Get a copy of the entry's raw path bytes.
*
* @return raw path bytes.
* @since 3.4
*/
public byte[] getRawPath() {
return path.clone();
}
/**
* {@inheritDoc}
* <p>
* Use for debugging only !
*/
@SuppressWarnings("nls")
@Override
public String toString() {
return getFileMode() + " " + getLength() + " "
+ getLastModifiedInstant()
+ " " + getObjectId() + " " + getStage() + " "
+ getPathString() + "\n";
}
/**
* Copy the ObjectId and other meta fields from an existing entry.
* <p>
* This method copies everything except the path from one entry to another,
* supporting renaming.
*
* @param src
* the entry to copy ObjectId and meta fields from.
*/
public void copyMetaData(DirCacheEntry src) {
copyMetaData(src, false);
}
/**
* Copy the ObjectId and other meta fields from an existing entry.
* <p>
* This method copies everything except the path and possibly stage from one
* entry to another, supporting renaming.
*
* @param src
* the entry to copy ObjectId and meta fields from.
* @param keepStage
* if true, the stage attribute will not be copied
*/
void copyMetaData(DirCacheEntry src, boolean keepStage) {
int origflags = NB.decodeUInt16(info, infoOffset + P_FLAGS);
int newflags = NB.decodeUInt16(src.info, src.infoOffset + P_FLAGS);
System.arraycopy(src.info, src.infoOffset, info, infoOffset, INFO_LEN);
final int pLen = origflags & NAME_MASK;
final int SHIFTED_STAGE_MASK = 0x3 << 12;
final int pStageShifted;
if (keepStage)
pStageShifted = origflags & SHIFTED_STAGE_MASK;
else
pStageShifted = newflags & SHIFTED_STAGE_MASK;
NB.encodeInt16(info, infoOffset + P_FLAGS, pStageShifted | pLen
| (newflags & ~NAME_MASK & ~SHIFTED_STAGE_MASK));
}
/**
* @return true if the entry contains extended flags.
*/
boolean isExtended() {
return (info[infoOffset + P_FLAGS] & EXTENDED) != 0;
}
private long decodeTS(int pIdx) {
final int base = infoOffset + pIdx;
final int sec = NB.decodeInt32(info, base);
final int ms = NB.decodeInt32(info, base + 4) / 1000000;
return 1000L * sec + ms;
}
private Instant decodeTSInstant(int pIdx) {
final int base = infoOffset + pIdx;
final int sec = NB.decodeInt32(info, base);
final int nano = NB.decodeInt32(info, base + 4);
return Instant.ofEpochSecond(sec, nano);
}
private void encodeTS(int pIdx, long when) {
final int base = infoOffset + pIdx;
NB.encodeInt32(info, base, (int) (when / 1000));
NB.encodeInt32(info, base + 4, ((int) (when % 1000)) * 1000000);
}
private void encodeTS(int pIdx, Instant when) {
final int base = infoOffset + pIdx;
NB.encodeInt32(info, base, (int) when.getEpochSecond());
NB.encodeInt32(info, base + 4, when.getNano());
}
private int getExtendedFlags() {
if (isExtended()) {
return NB.decodeUInt16(info, infoOffset + P_FLAGS2) << 16;
}
return 0;
}
private static void checkPath(byte[] path) {
try {
SystemReader.getInstance().checkPath(path);
} catch (CorruptObjectException e) {
InvalidPathException p = new InvalidPathException(toString(path));
p.initCause(e);
throw p;
}
}
static String toString(byte[] path) {
return UTF_8.decode(ByteBuffer.wrap(path)).toString();
}
static int getMaximumInfoLength(boolean extended) {
return extended ? INFO_LEN_EXTENDED : INFO_LEN;
}
}