PluckerTextStream.java :  » App » nookdevs » org » geometerplus » fbreader » formats » plucker » Android Open Source

/*
 * Copyright (C) 2007-2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.fbreader.formats.plucker;

import java.io.IOException;

import org.geometerplus.fbreader.formats.pdb.PdbStream;
import org.geometerplus.fbreader.formats.pdb.PdbUtil;
import org.geometerplus.zlibrary.core.filesystem.ZLFile;

public class PluckerTextStream extends PdbStream {
  private short myCompressionVersion;
  private  byte[] myFullBuffer;
  private  int myRecordIndex;

  public PluckerTextStream(ZLFile file) throws IOException {
    super(file);
    myFullBuffer = null;
  }
  
  public int read() {
    return 0;
  }
  
  public boolean open() throws IOException {
    //if (!super.open()) {
    //  return false;
    //}

    myCompressionVersion = (short) PdbUtil.readShort(myBase);

    myBuffer = new byte[65536];
    myFullBuffer = new byte[65536];

    myRecordIndex = 0;

    return true;
  }
  
  public  void close() throws IOException {
    if (myFullBuffer != null) {
      myFullBuffer = null;
    }
    super.close();
  }

  protected boolean fillBuffer() {
    while (myBufferOffset == myBufferLength) {
      if (myRecordIndex + 1 > myHeader.Offsets.length - 1) {
        return false;
      }
      ++myRecordIndex;
      int currentOffset = myHeader.Offsets[myRecordIndex];
      //if (currentOffset < myBase.offset()) {
      //  return false;
      //}
      //((PdbStream)myBase).seek(currentOffset, true);
      int nextOffset =
        (myRecordIndex + 1 < myHeader.Offsets.length) ?
            myHeader.Offsets[myRecordIndex + 1] : 0;//myBase.sizeOfOpened();
      if (nextOffset < currentOffset) {
        return false;
      }
      try {
        processRecord(nextOffset - currentOffset);
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return true;
  }

  private void processRecord(int recordSize) throws IOException {
    myBase.skip(2);

    int paragraphs = PdbUtil.readShort(myBase);
    int size = PdbUtil.readShort(myBase);
    
    char type = (char)myBase.read(); 
    if (type > 1) { // this record is not text record
      return;
    }

    myBase.skip(1);

    final int[] pars = new int[paragraphs];
    for (int i = 0; i < paragraphs; ++i) {
      pars[i] = PdbUtil.readShort(myBase);
      myBase.skip(2);
    }

    boolean doProcess = false;
    if (type == 0) {
      System.out.println(size);
      doProcess = myBase.read(myFullBuffer, 0, size) == size;
    } else if (myCompressionVersion == 1) {
      //doProcess =
        //DocDecompressor().decompress(myBase, myFullBuffer, recordSize - 8 - 4 * paragraphs, size) == size;
    } else if (myCompressionVersion == 2) {
      myBase.skip(2);
      //doProcess =
        //ZLZDecompressor(recordSize - 10 - 4 * paragraphs).decompress(myBase, myFullBuffer, size) == size;
    }
    if (doProcess) {
      myBufferLength = 0;
      myBufferOffset = 0;

      int start = 0;
      int end = 0;

      for (int i = 0; i < paragraphs; ++i) {
        start = end;
        end = start + pars[i];
        if (end > myFullBuffer[size]) {
          break;
        }
        processTextParagraph(myFullBuffer.toString().toCharArray(), start, end);
      }
    }
  }
  
  private  void processTextParagraph(char[] data, int start, int end) {
    int textStart = start;
    boolean functionFlag = false;
    for (int ptr = start; ptr < end; ++ptr) {
      if (data[ptr] == 0) {
        functionFlag = true;
        if (ptr != textStart) {
          //memcpy(myBuffer + myBufferLength, textStart, ptr - textStart);
          myBufferLength += ptr - textStart;
        }
      } else if (functionFlag) {
        int paramCounter = (data[ptr]) % 8;
        if (end - ptr > paramCounter + 1) {
          ptr += paramCounter;
        } else {
          ptr = end - 1;
        }
        functionFlag = false;
        textStart = ptr + 1;
      }
    }
    if (end != textStart) {
      //memcpy(myBuffer + myBufferLength, textStart, end - textStart);
      myBufferLength += end - textStart;
    }
  }
}