/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */

package org.alfresco.jlan.client;

import org.alfresco.jlan.client.info.ExtendedFileInfo;
import org.alfresco.jlan.client.info.FileInfo;
import org.alfresco.jlan.client.info.StreamInfo;
import org.alfresco.jlan.smb.NTTime;
import org.alfresco.jlan.smb.SMBDate;
import org.alfresco.jlan.smb.SMBException;
import org.alfresco.jlan.smb.SMBStatus;
import org.alfresco.jlan.util.DataBuffer;

/**
 * File Information Packer/Unpacker Class
 * 
 * @author gkspencer
 */
class FileInfoPacker {

	/**
	 * Unpack the standard file information levels 1 and 2
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @param ea boolean
	 * @return FileInfo
	 */
	protected final static FileInfo unpackFileInfoStandard(String fname, DataBuffer buf, boolean ea) {

		// Unpack the various file date/times

		int cfdat = buf.getShort();
		int cftim = buf.getShort();

		int afdat = buf.getShort();
		int aftim = buf.getShort();

		int wfdat = buf.getShort();
		int wftim = buf.getShort();

		int fsiz = buf.getInt();
		int alloc = buf.getInt();
		int fattr = buf.getShort();

		int eaSize = 0;
		if ( ea == true)
			eaSize = buf.getInt();

		// Create a file information object

		FileInfo info = null;
		if ( ea == false) {

			// Create standard file information

			info = new FileInfo(fname, fsiz, fattr, wfdat, wftim);
		}
		else {

			// Create an extended file information to hold the extended attributes size

			ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, fsiz, fattr, wfdat, wftim);
			extInfo.setExtendedAttributesSize(eaSize);

			info = extInfo;
		}

		// Set extra file information details

		if ( cfdat != 0)
			info.setCreationDateTime(cfdat, cftim);

		if ( afdat != 0)
			info.setAccessDateTime(afdat, aftim);

		info.setAllocationSize(alloc);

		// Return the file information

		return info;
	}

	/**
	 * Pack the standard file information
	 * 
	 * @param finfo FileInfo
	 * @param buf DataBuffer
	 * @param ea boolean
	 * @exception SMBException If the file information does not match the required level
	 */
	protected final static void packFileInfoStandard(FileInfo finfo, DataBuffer buf, boolean ea)
		throws SMBException {

		// If the extended attribute size is required the file information must contain extended
		// file information

		if ( ea == true && finfo instanceof ExtendedFileInfo == false)
			throw new SMBException(SMBStatus.JLANErr, SMBStatus.JLANInvalidFileInfo);

		// Pack the file creation date/time if available, or pack zero to indicate no change

		if ( finfo.hasCreationDateTime()) {
			SMBDate cDate = finfo.getCreationDateTime();
			buf.putShort(cDate.asSMBTime());
			buf.putShort(cDate.asSMBDate());
		}
		else
			buf.putZeros(4);

		// Pack the file access date/time if available

		if ( finfo.hasAccessDateTime()) {
			SMBDate aDate = finfo.getAccessDateTime();
			buf.putShort(aDate.asSMBTime());
			buf.putShort(aDate.asSMBDate());
		}
		else
			buf.putZeros(4);

		// Pack the file write date/time if available

		if ( finfo.hasModifyDateTime()) {
			SMBDate mDate = finfo.getModifyDateTime();
			buf.putShort(mDate.asSMBTime());
			buf.putShort(mDate.asSMBDate());
		}
		else
			buf.putZeros(4);

		// Pack the file size

		buf.putInt(finfo.getSizeInt());

		// Pack the file allocation size

		buf.putInt(finfo.getAllocationSizeInt());

		// Pack the file attributes

		buf.putShort(finfo.getFileAttributes());

		// Pack the EA size, if required

		if ( ea == true) {

			// Get the extended file information

			ExtendedFileInfo extInfo = (ExtendedFileInfo) finfo;

			// Pack the extended attribute size

			buf.putInt(extInfo.getExtendedAttributesSize());
		}
	}

	/**
	 * Unpack the query standard information (FileInfoLevel.PathFileStandardInfo, 0x102)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryStandardInfo(String fname, DataBuffer buf) {

		// Get the file allocation size and end of file offset

		long fileSize = buf.getLong();
		long allocSize = buf.getLong();

		// Get the delete pending and directory flags

		boolean delPending = buf.getByte() != 0 ? true : false;
		boolean isDirectory = buf.getByte() != 0 ? true : false;

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, fileSize, 0);
		extInfo.setAllocationSize(allocSize);
		extInfo.setDeletePending(delPending);

		// Return the extended file information

		return extInfo;
	}

	/**
	 * Unpack the query extended attribute information (FileInfoLevel.PathFileEAInfo, 0x103)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryEAInfo(String fname, DataBuffer buf) {

		// Get the extended attribute size

		int eaSize = buf.getInt();

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, 0, 0);
		extInfo.setExtendedAttributesSize(eaSize);

		// Return the extended file information

		return extInfo;
	}

	/**
	 * Unpack the query name information and alternate name information
	 * (FileInfoLevel.PathFileNameInfo and FileInfoLevel.PathFileAltNameInfo, 0x104 and 0x108)
	 * 
	 * @param buf DataBuffer
	 * @param uni boolean
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryNameInfo(DataBuffer buf, boolean uni) {

		// Get the name size and string

		buf.getInt();
		String name = buf.getString(uni);

		// Create the file information

		FileInfo finfo = new ExtendedFileInfo(name, 0, 0);

		// Return the file information

		return finfo;
	}

	/**
	 * Unpack the stream name information (FileInfoLevel.PathFileStreamInfo, 0x109)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @param uni boolean
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryStreamInfo(String fname, DataBuffer buf, boolean uni) {

		// Get the offset to the next stream information structure

		int pos = buf.getPosition();
		int offset = buf.getInt();

		// Loop until the end of the stream list

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, 0, 0);
		boolean endOfList = false;

		while (endOfList != true) {

			// Get the stream information

			int nameLen = buf.getInt();
			if ( uni == true)
				nameLen = nameLen / 2;

			long strmSize = buf.getLong();
			long strmAlloc = buf.getLong();

			String name = buf.getString(nameLen, uni);

			// Create the extended file information

			StreamInfo stream = new StreamInfo(name, 0, 0, strmSize, strmAlloc);
			extInfo.addNTFSStreamInfo(stream);

			// Position at the next stream information record

			if ( offset == 0)
				endOfList = true;
			else {
				pos += offset;
				buf.setPosition(pos);
				offset = buf.getInt();
			}
		}

		// Return the file information

		return extInfo;
	}

	/**
	 * Unpack the compression information (FileInfoLevel.PathFileCompressionInfo, 0x10B)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryCompressionInfo(String fname, DataBuffer buf) {

		// Get the compressed file size and compression format

		long compSize = buf.getLong();
		int compFmt = buf.getShort();

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, 0, 0);
		extInfo.setCompressedSizeFormat(compSize, compFmt);

		// Return the file information

		return extInfo;
	}

	/**
	 * Unpack the full file information (FileInfoLevel.PathFileAllInfo, 0x107)
	 * 
	 * @param buf DataBuffer
	 * @param uni boolean
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryAllInfo(DataBuffer buf, boolean uni) {

		// Get the file create/access/write/change times, in 64bit NT format

		long createTime = buf.getLong();
		long accessTime = buf.getLong();
		long writeTime = buf.getLong();
		long changeTime = buf.getLong();

		// Get the file attributes

		int attr = buf.getInt();
		buf.skipBytes(4); // unknown value

		// Get the file size and allocation size

		long allocSize = buf.getLong();
		long fileSize = buf.getLong();

		// Delete pending and directory flags

		boolean delPending = buf.getByte() != 0 ? true : false;
		boolean isDir = buf.getByte() != 0 ? true : false;
		buf.skipBytes(2);

		// Extended attributes size

		int eaSize = buf.getInt();

		// File name

		int nameLen = buf.getInt();
		if ( uni == true)
			nameLen = nameLen / 2;
		String name = buf.getString(nameLen, uni);

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(name, fileSize, attr);
		extInfo.setAllocationSize(allocSize);
		extInfo.setDeletePending(delPending);
		extInfo.setExtendedAttributesSize(eaSize);

		// Set the file times

		SMBDate smbDate = null;

		if ( createTime != 0) {
			smbDate = NTTime.toSMBDate(createTime);
			extInfo.setCreationDateTime(smbDate);
		}

		if ( accessTime != 0) {
			smbDate = NTTime.toSMBDate(accessTime);
			extInfo.setAccessDateTime(smbDate);
		}

		if ( writeTime != 0) {
			smbDate = NTTime.toSMBDate(writeTime);
			extInfo.setModifyDateTime(smbDate);
		}

		// Return the file information

		return extInfo;
	}

	/**
	 * Unpack the basic file information (FileInfoLevel.PathFileBasicInfo, 0x101)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryBasicInfo(String fname, DataBuffer buf) {

		// Get the file create/access/write/change times, in 64bit NT format

		long createTime = buf.getLong();
		long accessTime = buf.getLong();
		long writeTime = buf.getLong();
		long changeTime = buf.getLong();

		// Get the file attributes

		int attr = buf.getInt();

		// Extended attributes size

		int eaSize = buf.getInt();

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, 0, attr);
		extInfo.setExtendedAttributesSize(eaSize);

		// Set the file times

		SMBDate smbDate = null;

		if ( createTime != 0) {
			smbDate = NTTime.toSMBDate(createTime);
			extInfo.setCreationDateTime(smbDate);
		}

		if ( accessTime != 0) {
			smbDate = NTTime.toSMBDate(accessTime);
			extInfo.setAccessDateTime(smbDate);
		}

		if ( writeTime != 0) {
			smbDate = NTTime.toSMBDate(writeTime);
			extInfo.setModifyDateTime(smbDate);
		}

		// Return the file information

		return extInfo;
	}

	/**
	 * Pack the file basic information
	 * 
	 * @param finfo FileInfo
	 * @param buf DataBuffer
	 * @exception SMBException If the file information does not match the required level
	 */
	protected final static void packFileBasicInfo(FileInfo finfo, DataBuffer buf)
		throws SMBException {

		// Extended file information is required by the file basic information

		if ( finfo instanceof ExtendedFileInfo == false)
			throw new SMBException(SMBStatus.JLANErr, SMBStatus.JLANInvalidFileInfo);
		ExtendedFileInfo extInfo = (ExtendedFileInfo) finfo;

		// Pack the file creation date/time in NT format, if available

		if ( extInfo.hasCreationDateTime())
			buf.putLong(NTTime.toNTTime(extInfo.getCreationDateTime()));
		else
			buf.putZeros(8);

		// Pack the file access date/time in NT format, if available

		if ( extInfo.hasAccessDateTime())
			buf.putLong(NTTime.toNTTime(extInfo.getAccessDateTime()));
		else
			buf.putZeros(8);

		// Pack the file write and change date/times in NT format, if available

		if ( extInfo.hasModifyDateTime()) {
			buf.putLong(NTTime.toNTTime(extInfo.getModifyDateTime()));
			buf.putLong(NTTime.toNTTime(extInfo.getModifyDateTime()));
		}
		else
			buf.putZeros(16);

		// Pack the NT file attributes

		buf.putInt(extInfo.getFileAttributes());

		// Pack the extended attributes size

		buf.putInt(extInfo.getExtendedAttributesSize());
	}

	/**
	 * Unpack the quesy all EAs file information (FileInfoLevel.PathQueryAllEAs, 0x04)
	 * 
	 * @param fname String
	 * @param buf DataBuffer
	 * @return FileInfo
	 */
	protected final static FileInfo unpackQueryAllEAs(String fname, DataBuffer buf) {

		// Create the extended file information

		ExtendedFileInfo extInfo = new ExtendedFileInfo(fname, 0, 0);

		// Unpack the extended attribute raw data size

		int eaSize = buf.getInt() - 4;
		byte[] eaData = null;

		if ( eaSize > 0) {

			// Allocate the extended attribute data block and copy the data from the buffer

			eaData = new byte[eaSize];
			System.arraycopy(buf.getBuffer(), buf.getPosition(), eaData, 0, eaSize);
		}

		// Set the extended attribute details

		extInfo.setExtendedAttributesSize(eaSize);
		extInfo.setExtendedAttributeData(eaData);

		// Return the extended attribute file information

		return extInfo;
	}
}