public void writeToStream(ImageOutputStream stream, final boolean isBTIFF) throws IOException {
long nextSpace;
if (!isBTIFF) {
int numFields = getNumTIFFFields();
stream.writeShort(numFields);
nextSpace = stream.getStreamPosition() + 12 * numFields + 4;
} else {
long numFields = getNumTIFFFields();
stream.writeLong(numFields);
nextSpace = stream.getStreamPosition() + 20 * numFields + 8;
}
Iterator iter = iterator();
while (iter.hasNext()) {
TIFFField f = (TIFFField) iter.next();
TIFFTag tag = f.getTag();
int type = f.getType();
int count = f.getCount();
// Hack to deal with unknown tags
if (type == 0) {
type = TIFFTag.TIFF_UNDEFINED;
}
int size = count * TIFFTag.getSizeOfType(type);
if (type == TIFFTag.TIFF_ASCII) {
int chars = 0;
for (int i = 0; i < count; i++) {
chars += f.getAsString(i).length() + 1;
}
count = chars;
size = count;
}
int tagNumber = f.getTagNumber();
stream.writeShort(tagNumber);
stream.writeShort(type);
if (isBTIFF) {
stream.writeLong(count);
stream.writeLong(0);
stream.mark(); // Mark beginning of next field
stream.skipBytes(-8);
} else {
stream.writeInt(count);
stream.writeInt(0);
stream.mark(); // Mark beginning of next field
stream.skipBytes(-4);
}
long pos;
if (!isBTIFF) {
if (size > 4 || tag.isIFDPointer()) {
// Ensure IFD or value is written on a word boundary
nextSpace = (nextSpace + 3) & ~0x3;
stream.writeInt((int) nextSpace);
stream.seek(nextSpace);
pos = nextSpace;
if (tag.isIFDPointer()) {
TIFFIFD subIFD = (TIFFIFD) f.getData();
subIFD.writeToStream(stream, isBTIFF);
nextSpace = subIFD.lastPosition;
} else {
writeTIFFFieldToStream(f, stream);
nextSpace = stream.getStreamPosition();
}
} else {
pos = stream.getStreamPosition();
writeTIFFFieldToStream(f, stream);
}
} else {
if (size > 8 || tag.isIFDPointer()) {
// Ensure IFD or value is written on a Long boundary
nextSpace = (nextSpace + 7) & ~0x7;
stream.writeLong(nextSpace);
stream.seek(nextSpace);
pos = nextSpace;
if (tag.isIFDPointer()) {
TIFFIFD subIFD = (TIFFIFD) f.getData();
subIFD.writeToStream(stream, isBTIFF);
nextSpace = subIFD.lastPosition;
} else {
writeTIFFFieldToStream(f, stream);
nextSpace = stream.getStreamPosition();
}
} else {
pos = stream.getStreamPosition();
writeTIFFFieldToStream(f, stream);
}
}
// If we are writing the data for the
// StripByteCounts, TileByteCounts, StripOffsets,
// TileOffsets, JPEGInterchangeFormat, or
// JPEGInterchangeFormatLength fields, record the current stream
// position for backpatching
if (tagNumber == BaselineTIFFTagSet.TAG_STRIP_BYTE_COUNTS
|| tagNumber == BaselineTIFFTagSet.TAG_TILE_BYTE_COUNTS
|| tagNumber == BaselineTIFFTagSet.TAG_JPEG_INTERCHANGE_FORMAT_LENGTH) {
this.stripOrTileByteCountsPosition = pos;
} else if (tagNumber == BaselineTIFFTagSet.TAG_STRIP_OFFSETS
|| tagNumber == BaselineTIFFTagSet.TAG_TILE_OFFSETS
|| tagNumber == BaselineTIFFTagSet.TAG_JPEG_INTERCHANGE_FORMAT) {
this.stripOrTileOffsetsPosition = pos;
}
stream.reset(); // Go to marked position of next field
}
this.lastPosition = nextSpace;
}
