Exemplo n.º 1
0
  static byte[] getBytes(final long start, final int count, final RandomAccessBuffer pdf_datafile) {

    final byte[] buffer = new byte[count];

    try {
      pdf_datafile.seek(start);
      pdf_datafile.read(buffer); // get next chars
    } catch (final IOException e) {
      LogWriter.writeLog("Exception: " + e.getMessage());
    }

    return buffer;
  }
Exemplo n.º 2
0
  /** read table of values */
  public int readXRefs(
      int current,
      final byte[] Bytes,
      final int endTable,
      int i,
      final long eof,
      final RandomAccessBuffer pdf_datafile) {

    char flag;
    int id, tokenCount, generation, lineLen, startLine, endLine;
    boolean skipNext = false;
    boolean isFirstValue = true;

    final int[] breaks = new int[5];
    final int[] starts = new int[5];

    // loop to read all references
    while (i < endTable) { // exit end at trailer

      startLine = i;
      endLine = -1;

      /** read line locations */
      // move to start of value ignoring spaces or returns
      while (Bytes[i] != 10 && Bytes[i] != 13) {
        // scan for %
        if ((endLine == -1) && (Bytes[i] == 37)) {
          endLine = i - 1;
        }

        i++;
      }

      // set end if no comment
      if (endLine == -1) {
        endLine = i - 1;
      }

      // strip any spaces
      while (Bytes[startLine] == 32) {
        startLine++;
      }

      // strip any spaces
      while (Bytes[endLine] == 32) {
        endLine--;
      }

      i++;

      /** decode the line */
      tokenCount = 0;
      lineLen = endLine - startLine + 1;

      if (lineLen > 0) {

        // decide if line is a section header or value

        // first count tokens
        int lastChar = 1, currentChar;
        for (int j = 1; j < lineLen; j++) {
          currentChar = Bytes[startLine + j];

          if ((currentChar == 32) && (lastChar != 32)) {
            breaks[tokenCount] = j;
            tokenCount++;
          } else if ((currentChar != 32) && (lastChar == 32)) {
            starts[tokenCount] = j;
          }

          lastChar = currentChar;
        }

        // update numbers so loops work
        breaks[tokenCount] = lineLen;
        tokenCount++;

        if (tokenCount == 1) { // fix for first 2 values on separate lines

          if (skipNext) {
            skipNext = false;
          } else {
            current = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
            skipNext = true;
          }

        } else if (tokenCount == 2) {
          current = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
        } else {

          id = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
          generation = NumberUtils.parseInt(startLine + starts[1], startLine + breaks[1], Bytes);

          flag = (char) Bytes[startLine + starts[2]];

          if ((flag == 'n')) { // only add objects in use

            /** assume not valid and test to see if valid */
            boolean isValid = false;

            // get bytes
            int bufSize = 20;

            // adjust buffer if less than 1024 bytes left in file
            if (id + bufSize > eof) {
              bufSize = (int) (eof - id);
            }

            if (bufSize > 0) {

              /** get bytes into buffer */
              final byte[] buffer = getBytes(id, bufSize, pdf_datafile);

              // look for space o b j
              for (int ii = 4; ii < bufSize; ii++) {
                if ((buffer[ii - 3] == 32 || buffer[ii - 3] == 10)
                    && (buffer[ii - 2] == 111)
                    && (buffer[ii - 1] == 98)
                    && (buffer[ii] == 106)) {
                  isValid = true;
                  ii = bufSize;
                }
              }

              // check number
              if (isValid && isFirstValue) {

                isFirstValue = false;

                if (buffer[0] == 48 && buffer[1] != 48 && current == 1) {
                  current = 0;
                } else if (buffer[0] == 49 && buffer[1] == 32) {
                  current = 1;
                }
              }

              if (isValid) {
                storeObjectOffset(current, id, generation, false, false);
                xref.addElement(id);
              } else if (LogWriter.isRunningFromIDE) {
                LogWriter.writeLog(current + " " + id + " is bum reference");
              }
            }

            current++; // update our pointer
          } else if (flag == 'f') {
            current++; // update our pointer
          }
        }
      }
    }
    return current;
  }