/jEdit/tags/jedit-4-3-pre5/de/masters_of_disaster/ant/tasks/ar/ArEntry.java
Java | 355 lines | 123 code | 38 blank | 194 comment | 7 complexity | b6c658e87c9ccc4fcfdb78c260c49556 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- package de.masters_of_disaster.ant.tasks.ar;
- import java.io.File;
- import java.util.Date;
- /**
- * This class represents an entry in an Ar archive. It consists
- * of the entry's header, as well as the entry's File. Entries
- * can be instantiated in one of three ways, depending on how
- * they are to be used.
- * <p>
- * ArEntries that are created from the header bytes read from
- * an archive are instantiated with the ArEntry( byte[] )
- * constructor. These entries will be used when extracting from
- * or listing the contents of an archive. These entries have their
- * header filled in using the header bytes. They also set the File
- * to null, since they reference an archive entry not a file.
- * <p>
- * ArEntries that are created from Files that are to be written
- * into an archive are instantiated with the ArEntry( File )
- * constructor. These entries have their header filled in using
- * the File's information. They also keep a reference to the File
- * for convenience when writing entries.
- * <p>
- * Finally, ArEntries can be constructed from nothing but a name.
- * This allows the programmer to construct the entry by hand, for
- * instance when only an InputStream is available for writing to
- * the archive, and the header information is constructed from
- * other information. In this case the header fields are set to
- * defaults and the File is set to null.
- *
- * <p>
- * The C structure for an Ar Entry's header is:
- * <pre>
- * struct header {
- * char filename[16];
- * char filedate[12];
- * char uid[6];
- * char gid[6];
- * char mode[8];
- * char size[10];
- * char magic[2];
- * } header;
- * </pre>
- *
- */
- public class ArEntry implements ArConstants {
- /** The entry's filename. */
- private StringBuffer filename;
- /** The entry's file date. */
- private long fileDate;
- /** The entry's user id. */
- private int userId;
- /** The entry's group id. */
- private int groupId;
- /** The entry's permission mode. */
- private int mode;
- /** The entry's size. */
- private long size;
- /** The entry's magic tag. */
- private StringBuffer magic;
- /** The entry's file reference */
- private File file;
- /** Default permissions bits for files */
- public static final int DEFAULT_FILE_MODE = 0100644;
- /** Convert millis to seconds */
- public static final int MILLIS_PER_SECOND = 1000;
- /**
- * Construct an empty entry and prepares the header values.
- */
- private ArEntry () {
- this.magic = new StringBuffer(HEADERMAGIC);
- this.filename = new StringBuffer();
- this.userId = 0;
- this.groupId = 0;
- this.file = null;
- }
- /**
- * Construct an entry with only a name. This allows the programmer
- * to construct the entry's header "by hand". File is set to null.
- *
- * @param name the entry name
- */
- public ArEntry(String name) {
- this();
- if (name.endsWith("/")) {
- throw new IllegalArgumentException("ar archives can only contain files");
- }
- this.filename = new StringBuffer(name);
- this.mode = DEFAULT_FILE_MODE;
- this.userId = 0;
- this.groupId = 0;
- this.size = 0;
- this.fileDate = (new Date()).getTime() / MILLIS_PER_SECOND;
- }
- /**
- * Construct an entry for a file. File is set to file, and the
- * header is constructed from information from the file.
- *
- * @param file The file that the entry represents.
- */
- public ArEntry(File file) {
- this();
- if (file.isDirectory()) {
- throw new IllegalArgumentException("ar archives can only contain files");
- }
- this.file = file;
- this.filename = new StringBuffer(file.getName());
- this.fileDate = file.lastModified() / MILLIS_PER_SECOND;
- this.mode = DEFAULT_FILE_MODE;
- this.size = file.length();
- }
- /**
- * Construct an entry from an archive's header bytes. File is set
- * to null.
- *
- * @param headerBuf The header bytes from an ar archive entry.
- */
- public ArEntry(byte[] headerBuf) {
- this();
- this.parseArHeader(headerBuf);
- }
- /**
- * Determine if the two entries are equal. Equality is determined
- * by the header names being equal.
- *
- * @param it Entry to be checked for equality.
- * @return True if the entries are equal.
- */
- public boolean equals(ArEntry it) {
- return this.getFilename().equals(it.getFilename());
- }
- /**
- * Determine if the two entries are equal. Equality is determined
- * by the header names being equal.
- *
- * @param it Entry to be checked for equality.
- * @return True if the entries are equal.
- */
- public boolean equals(Object it) {
- if (it == null || getClass() != it.getClass()) {
- return false;
- }
- return equals((ArEntry) it);
- }
- /**
- * Hashcodes are based on entry names.
- *
- * @return the entry hashcode
- */
- public int hashCode() {
- return getFilename().hashCode();
- }
- /**
- * Get this entry's name.
- *
- * @return This entry's name.
- */
- public String getFilename() {
- return this.filename.toString();
- }
- /**
- * Set this entry's name.
- *
- * @param name This entry's new name.
- */
- public void setFilename(String filename) {
- this.filename = new StringBuffer(filename);
- }
- /**
- * Set the mode for this entry
- *
- * @param mode the mode for this entry
- */
- public void setMode(int mode) {
- this.mode = mode;
- }
- /**
- * Get this entry's user id.
- *
- * @return This entry's user id.
- */
- public int getUserId() {
- return this.userId;
- }
- /**
- * Set this entry's user id.
- *
- * @param userId This entry's new user id.
- */
- public void setUserId(int userId) {
- this.userId = userId;
- }
- /**
- * Get this entry's group id.
- *
- * @return This entry's group id.
- */
- public int getGroupId() {
- return this.groupId;
- }
- /**
- * Set this entry's group id.
- *
- * @param groupId This entry's new group id.
- */
- public void setGroupId(int groupId) {
- this.groupId = groupId;
- }
- /**
- * Convenience method to set this entry's group and user ids.
- *
- * @param userId This entry's new user id.
- * @param groupId This entry's new group id.
- */
- public void setIds(int userId, int groupId) {
- this.setUserId(userId);
- this.setGroupId(groupId);
- }
- /**
- * Set this entry's modification time. The parameter passed
- * to this method is in "Java time".
- *
- * @param time This entry's new modification time.
- */
- public void setFileDate(long time) {
- this.fileDate = time / MILLIS_PER_SECOND;
- }
- /**
- * Set this entry's modification time.
- *
- * @param time This entry's new modification time.
- */
- public void setFileDate(Date time) {
- this.fileDate = time.getTime() / MILLIS_PER_SECOND;
- }
- /**
- * Get this entry's modification time.
- *
- * @return time This entry's new modification time.
- */
- public Date getFileDate() {
- return new Date(this.fileDate * MILLIS_PER_SECOND);
- }
- /**
- * Get this entry's file.
- *
- * @return This entry's file.
- */
- public File getFile() {
- return this.file;
- }
- /**
- * Get this entry's mode.
- *
- * @return This entry's mode.
- */
- public int getMode() {
- return this.mode;
- }
- /**
- * Get this entry's file size.
- *
- * @return This entry's file size.
- */
- public long getSize() {
- return this.size;
- }
- /**
- * Set this entry's file size.
- *
- * @param size This entry's new file size.
- */
- public void setSize(long size) {
- this.size = size;
- }
- /**
- * Write an entry's header information to a header buffer.
- *
- * @param outbuf The tar entry header buffer to fill in.
- */
- public void writeEntryHeader(byte[] outbuf) {
- int offset = 0;
- offset = ArUtils.getNameBytes(this.filename, outbuf, offset, NAMELEN);
- offset = ArUtils.getLongBytes(this.fileDate, outbuf, offset, FILEDATELEN);
- offset = ArUtils.getIntegerBytes(this.userId, outbuf, offset, UIDLEN);
- offset = ArUtils.getIntegerBytes(this.groupId, outbuf, offset, GIDLEN);
- offset = ArUtils.getOctalBytes(this.mode, outbuf, offset, MODELEN);
- offset = ArUtils.getLongBytes(this.size, outbuf, offset, SIZELEN);
- offset = ArUtils.getNameBytes(this.magic, outbuf, offset, MAGICLEN);
- while (offset < outbuf.length) {
- outbuf[offset++] = 0;
- }
- }
- /**
- * Parse an entry's header information from a header buffer.
- *
- * @param header The ar entry header buffer to get information from.
- */
- public void parseArHeader(byte[] header) {
- throw new UnsupportedOperationException("parseArHeader(byte[]) not yet implmented");
- // int offset = 0;
- //
- // this.filename = TarUtils.parseName(header, offset, NAMELEN);
- // offset += NAMELEN;
- // this.fileDate = TarUtils.parseOctal(header, offset, FILEDATELEN);
- // offset += FILEDATELEN;
- // this.userId = (int) TarUtils.parseOctal(header, offset, UIDLEN);
- // offset += UIDLEN;
- // this.groupId = (int) TarUtils.parseOctal(header, offset, GIDLEN);
- // offset += GIDLEN;
- // this.mode = (int) TarUtils.parseOctal(header, offset, MODELEN);
- // offset += MODELEN;
- // this.size = TarUtils.parseOctal(header, offset, SIZELEN);
- // offset += SIZELEN;
- // this.magic = TarUtils.parseName(header, offset, MAGICLEN);
- // offset += MAGICLEN;
- }
- }