예제 #1
0
  public void initialize(
      ImageInputStream stream, boolean ignoreUnknownFields, final boolean isBTIFF)
      throws IOException {
    removeTIFFFields();

    List tagSetList = getTagSetList();

    final long numEntries;
    if (isBTIFF) numEntries = stream.readLong();
    else numEntries = stream.readUnsignedShort();

    for (int i = 0; i < numEntries; i++) {
      // Read tag number, value type, and value count.
      int tag = stream.readUnsignedShort();
      int type = stream.readUnsignedShort();
      int count;
      if (isBTIFF) {
        long count_ = stream.readLong();
        count = (int) count_;
        if (count != count_)
          throw new IllegalArgumentException("unable to use long number of values");
      } else count = (int) stream.readUnsignedInt();

      // Get the associated TIFFTag.
      TIFFTag tiffTag = getTag(tag, tagSetList);

      // Ignore unknown fields.
      if (ignoreUnknownFields && tiffTag == null) {
        // Skip the value/offset so as to leave the stream
        // position at the start of the next IFD entry.

        if (isBTIFF) stream.skipBytes(8);
        else stream.skipBytes(4);

        // XXX Warning message ...

        // Continue with the next IFD entry.
        continue;
      }

      long nextTagOffset;

      if (isBTIFF) {
        nextTagOffset = stream.getStreamPosition() + 8;
        int sizeOfType = TIFFTag.getSizeOfType(type);
        if (count * sizeOfType > 8) {
          long value = stream.readLong();
          stream.seek(value);
        }
      } else {
        nextTagOffset = stream.getStreamPosition() + 4;
        int sizeOfType = TIFFTag.getSizeOfType(type);
        if (count * sizeOfType > 4) {
          long value = stream.readUnsignedInt();
          stream.seek(value);
        }
      }

      if (tag == BaselineTIFFTagSet.TAG_STRIP_BYTE_COUNTS
          || tag == BaselineTIFFTagSet.TAG_TILE_BYTE_COUNTS
          || tag == BaselineTIFFTagSet.TAG_JPEG_INTERCHANGE_FORMAT_LENGTH) {
        this.stripOrTileByteCountsPosition = stream.getStreamPosition();
        if (LAZY_LOADING) {
          type = type == TIFFTag.TIFF_LONG ? TIFFTag.TIFF_LAZY_LONG : TIFFTag.TIFF_LAZY_LONG8;
        }
      } else if (tag == BaselineTIFFTagSet.TAG_STRIP_OFFSETS
          || tag == BaselineTIFFTagSet.TAG_TILE_OFFSETS
          || tag == BaselineTIFFTagSet.TAG_JPEG_INTERCHANGE_FORMAT) {
        this.stripOrTileOffsetsPosition = stream.getStreamPosition();
        if (LAZY_LOADING) {
          type = type == TIFFTag.TIFF_LONG ? TIFFTag.TIFF_LAZY_LONG : TIFFTag.TIFF_LAZY_LONG8;
        }
      }

      Object obj = null;

      try {
        switch (type) {
          case TIFFTag.TIFF_BYTE:
          case TIFFTag.TIFF_SBYTE:
          case TIFFTag.TIFF_UNDEFINED:
          case TIFFTag.TIFF_ASCII:
            byte[] bvalues = new byte[count];
            stream.readFully(bvalues, 0, count);

            if (type == TIFFTag.TIFF_ASCII) {
              // Can be multiple strings
              final List<String> v = new ArrayList<String>();
              boolean inString = false;
              int prevIndex = 0;
              for (int index = 0; index <= count; index++) {
                if (index < count && bvalues[index] != 0) {
                  if (!inString) {
                    // start of string
                    prevIndex = index;
                    inString = true;
                  }
                } else { // null or special case at end of string
                  if (inString) {
                    // end of string
                    final String s = new String(bvalues, prevIndex, index - prevIndex);
                    v.add(s);
                    inString = false;
                  }
                }
              }

              count = v.size();
              String[] strings;
              if (count != 0) {
                strings = new String[count];
                for (int c = 0; c < count; c++) {
                  strings[c] = v.get(c);
                }
              } else {
                // This case has been observed when the value of
                // 'count' recorded in the field is non-zero but
                // the value portion contains all nulls.
                count = 1;
                strings = new String[] {""};
              }

              obj = strings;
            } else {
              obj = bvalues;
            }
            break;

          case TIFFTag.TIFF_SHORT:
            char[] cvalues = new char[count];
            for (int j = 0; j < count; j++) {
              cvalues[j] = (char) (stream.readUnsignedShort());
            }
            obj = cvalues;
            break;

          case TIFFTag.TIFF_LONG:
          case TIFFTag.TIFF_IFD_POINTER:
            long[] lvalues = new long[count];
            for (int j = 0; j < count; j++) {
              lvalues[j] = stream.readUnsignedInt();
            }
            obj = lvalues;
            break;

          case TIFFTag.TIFF_RATIONAL:
            long[][] llvalues = new long[count][2];
            for (int j = 0; j < count; j++) {
              llvalues[j][0] = stream.readUnsignedInt();
              llvalues[j][1] = stream.readUnsignedInt();
            }
            obj = llvalues;
            break;

          case TIFFTag.TIFF_SSHORT:
            short[] svalues = new short[count];
            for (int j = 0; j < count; j++) {
              svalues[j] = stream.readShort();
            }
            obj = svalues;
            break;

          case TIFFTag.TIFF_SLONG:
            int[] ivalues = new int[count];
            for (int j = 0; j < count; j++) {
              ivalues[j] = stream.readInt();
            }
            obj = ivalues;
            break;

          case TIFFTag.TIFF_SRATIONAL:
            int[][] iivalues = new int[count][2];
            for (int j = 0; j < count; j++) {
              iivalues[j][0] = stream.readInt();
              iivalues[j][1] = stream.readInt();
            }
            obj = iivalues;
            break;

          case TIFFTag.TIFF_FLOAT:
            float[] fvalues = new float[count];
            for (int j = 0; j < count; j++) {
              fvalues[j] = stream.readFloat();
            }
            obj = fvalues;
            break;

          case TIFFTag.TIFF_DOUBLE:
            double[] dvalues = new double[count];
            for (int j = 0; j < count; j++) {
              dvalues[j] = stream.readDouble();
            }
            obj = dvalues;
            break;

          case TIFFTag.TIFF_LONG8:
          case TIFFTag.TIFF_SLONG8:
          case TIFFTag.TIFF_IFD8:
            long[] lBvalues = new long[count];
            for (int j = 0; j < count; j++) {
              lBvalues[j] = stream.readLong();
            }
            obj = lBvalues;
            break;

          case TIFFTag.TIFF_LAZY_LONG8:
          case TIFFTag.TIFF_LAZY_LONG:
            obj = new TIFFLazyData(stream, type, count);
            break;
          default:
            // XXX Warning
            break;
        }
      } catch (EOFException eofe) {
        // The TIFF 6.0 fields have tag numbers less than or equal
        // to 532 (ReferenceBlackWhite) or equal to 33432 (Copyright).
        // If there is an error reading a baseline tag, then re-throw
        // the exception and fail; otherwise continue with the next
        // field.
        if (BaselineTIFFTagSet.getInstance().getTag(tag) == null) {
          throw eofe;
        }
      }

      if (tiffTag == null) {
        // XXX Warning: unknown tag
      } else if (!tiffTag.isDataTypeOK(type)) {
        // XXX Warning: bad data type
      } else if (tiffTag.isIFDPointer() && obj != null) {
        stream.mark();
        stream.seek(((long[]) obj)[0]);

        List tagSets = new ArrayList(1);
        tagSets.add(tiffTag.getTagSet());
        TIFFIFD subIFD = new TIFFIFD(tagSets);

        // XXX Use same ignore policy for sub-IFD fields?
        subIFD.initialize(stream, ignoreUnknownFields);
        obj = subIFD;
        stream.reset();
      }

      if (tiffTag == null) {
        tiffTag = new TIFFTag(null, tag, 1 << type, null);
      }

      // Add the field if its contents have been initialized which
      // will not be the case if an EOF was ignored above.
      if (obj != null) {
        TIFFField f = new TIFFField(tiffTag, type, count, obj);
        addTIFFField(f);
      }

      stream.seek(nextTagOffset);
    }

    this.lastPosition = stream.getStreamPosition();
  }
예제 #2
0
 // Stream position initially at beginning, left at end
 // if ignoreUnknownFields is true, do not load fields for which
 // a tag cannot be found in an allowed TagSet.
 public void initialize(ImageInputStream stream, boolean ignoreUnknownFields) throws IOException {
   initialize(stream, ignoreUnknownFields, false);
 }