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/*
* Copyright (c) 2009-2010 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.scene.plugins.blender.file;
import com.jme3.scene.plugins.blender.BlenderContext;
import com.jme3.scene.plugins.blender.exceptions.BlenderFileException;
/**
* A class that holds the header data of a file block. The file block itself is not implemented. This class holds its
* start position in the stream and using this the structure can fill itself with the proper data.
* @author Marcin Roguski
*/
public class FileBlockHeader {
public static final int BLOCK_TE00 = 'T' << 24 | 'E' << 16; //TE00
public static final int BLOCK_ME00 = 'M' << 24 | 'E' << 16; //ME00
public static final int BLOCK_SR00 = 'S' << 24 | 'R' << 16; //SR00
public static final int BLOCK_CA00 = 'C' << 24 | 'A' << 16; //CA00
public static final int BLOCK_LA00 = 'L' << 24 | 'A' << 16; //LA00
public static final int BLOCK_OB00 = 'O' << 24 | 'B' << 16; //OB00
public static final int BLOCK_MA00 = 'M' << 24 | 'A' << 16; //MA00
public static final int BLOCK_SC00 = 'S' << 24 | 'C' << 16; //SC00
public static final int BLOCK_WO00 = 'W' << 24 | 'O' << 16; //WO00
public static final int BLOCK_TX00 = 'T' << 24 | 'X' << 16; //TX00
public static final int BLOCK_IP00 = 'I' << 24 | 'P' << 16; //IP00
public static final int BLOCK_AC00 = 'A' << 24 | 'C' << 16; //AC00
public static final int BLOCK_GLOB = 'G' << 24 | 'L' << 16 | 'O' << 8 | 'B'; //GLOB
public static final int BLOCK_REND = 'R' << 24 | 'E' << 16 | 'N' << 8 | 'D'; //REND
public static final int BLOCK_DATA = 'D' << 24 | 'A' << 16 | 'T' << 8 | 'A'; //DATA
public static final int BLOCK_DNA1 = 'D' << 24 | 'N' << 16 | 'A' << 8 | '1'; //DNA1
public static final int BLOCK_ENDB = 'E' << 24 | 'N' << 16 | 'D' << 8 | 'B'; //ENDB
/** Identifier of the file-block [4 bytes]. */
private int code;
/** Total length of the data after the file-block-header [4 bytes]. */
private int size;
/**
* Memory address the structure was located when written to disk [4 or 8 bytes (defined in file header as a pointer
* size)].
*/
private long oldMemoryAddress;
/** Index of the SDNA structure [4 bytes]. */
private int sdnaIndex;
/** Number of structure located in this file-block [4 bytes]. */
private int count;
/** Start position of the block's data in the stream. */
private int blockPosition;
/**
* Constructor. Loads the block header from the given stream during instance creation.
* @param inputStream
* the stream we read the block header from
* @param blenderContext
* the blender context
* @throws BlenderFileException
* this exception is thrown when the pointer size is neither 4 nor 8
*/
public FileBlockHeader(BlenderInputStream inputStream, BlenderContext blenderContext) throws BlenderFileException {
inputStream.alignPosition(4);
code = inputStream.readByte() << 24 | inputStream.readByte() << 16
| inputStream.readByte() << 8 | inputStream.readByte();
size = inputStream.readInt();
oldMemoryAddress = inputStream.readPointer();
sdnaIndex = inputStream.readInt();
count = inputStream.readInt();
blockPosition = inputStream.getPosition();
if (FileBlockHeader.BLOCK_DNA1 == code) {
blenderContext.setBlockData(new DnaBlockData(inputStream, blenderContext));
} else {
inputStream.setPosition(blockPosition + size);
blenderContext.addFileBlockHeader(Long.valueOf(oldMemoryAddress), this);
}
}
/**
* This method returns the structure described by the header filled with appropriate data.
* @param blenderContext
* the blender context
* @return structure filled with data
* @throws BlenderFileException
*/
public Structure getStructure(BlenderContext blenderContext) throws BlenderFileException {
blenderContext.getInputStream().setPosition(blockPosition);
Structure structure = blenderContext.getDnaBlockData().getStructure(sdnaIndex);
structure.fill(blenderContext.getInputStream());
return structure;
}
/**
* This method returns the code of this data block.
* @return the code of this data block
*/
public int getCode() {
return code;
}
/**
* This method returns the size of the data stored in this block.
* @return the size of the data stored in this block
*/
public int getSize() {
return size;
}
/**
* This method returns the memory address.
* @return the memory address
*/
public long getOldMemoryAddress() {
return oldMemoryAddress;
}
/**
* This method returns the sdna index.
* @return the sdna index
*/
public int getSdnaIndex() {
return sdnaIndex;
}
/**
* This data returns the number of structure stored in the data block after this header.
* @return the number of structure stored in the data block after this header
*/
public int getCount() {
return count;
}
/**
* This method returns the start position of the data block in the blend file stream.
* @return the start position of the data block
*/
public int getBlockPosition() {
return blockPosition;
}
/**
* This method indicates if the block is the last block in the file.
* @return true if this block is the last one in the file nad false otherwise
*/
public boolean isLastBlock() {
return FileBlockHeader.BLOCK_ENDB == code;
}
/**
* This method indicates if the block is the SDNA block.
* @return true if this block is the SDNA block and false otherwise
*/
public boolean isDnaBlock() {
return FileBlockHeader.BLOCK_DNA1 == code;
}
@Override
public String toString() {
return "FILE BLOCK HEADER [" + this.codeToString(code) + " : " + size + " : " + oldMemoryAddress + " : " + sdnaIndex + " : " + count + "]";
}
/**
* This method transforms the coded bloch id into a string value.
* @param code
* the id of the block
* @return the string value of the block id
*/
protected String codeToString(int code) {
char c1 = (char) ((code & 0xFF000000) >> 24);
char c2 = (char) ((code & 0xFF0000) >> 16);
char c3 = (char) ((code & 0xFF00) >> 8);
char c4 = (char) (code & 0xFF);
return String.valueOf(c1) + c2 + c3 + c4;
}
}
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