/** Reads an SRATIONAL value and returns it as a Rational. */
protected Rational readSignedRational(long count, long value) throws IOException {
_raf.seek(value);
long numer = ModuleBase.readSignedInt(_raf, _bigEndian);
long denom = ModuleBase.readSignedInt(_raf, _bigEndian);
return new Rational(numer, denom);
}
/**
* Reads an array of strings from the TIFF file.
*
* @param count Number of strings to read
* @param value Offset from which to read
*/
protected String[] readASCIIArray(long count, long value) throws IOException {
_raf.seek(value);
int nstrs = 0;
List list = new LinkedList();
byte[] buf = new byte[(int) count];
_raf.read(buf);
StringBuffer strbuf = new StringBuffer();
for (int i = 0; i < count; i++) {
int b = buf[i];
if (b == 0) {
list.add(strbuf.toString());
strbuf.setLength(0);
} else {
strbuf.append((char) b);
}
}
/* We can't use ArrayList.toArray because that returns an
Object[], not a String[] ... sigh. */
String[] strs = new String[nstrs];
ListIterator iter = list.listIterator();
for (int i = 0; i < nstrs; i++) {
strs[i] = (String) iter.next();
}
return strs;
}
/** Reads a TIFF array of signed 16-bit values and returns it as an int array. */
protected int[] readSShortArray(int type, long count, long value) throws IOException {
_raf.seek(value);
int[] iarray = new int[(int) count];
for (int i = 0; i < count; i++) {
iarray[i] = ModuleBase.readSignedShort(_raf, _bigEndian);
}
return iarray;
}
/** Reads a TIFF array of unsigned 16-bit values and returns it as an int array. */
protected int[] readShortArray(int type, long count, long value) throws IOException {
_raf.seek(value);
int[] iarray = new int[(int) count];
for (int i = 0; i < count; i++) {
iarray[i] = (int) readUnsigned(type);
}
return iarray;
}
/**
* Reads a TIFF array of signed 32-bit integer values and returns it as a long array.
*
* @param type TIFF type to read; must be a 32-bit type
* @param count Number of values to read
* @param value Offset from which to read
*/
protected long[] readLongArray(int type, long count, long value) throws IOException {
_raf.seek(value);
long[] array = new long[(int) count];
for (int i = 0; i < count; i++) {
array[i] = readUnsigned(type);
}
return array;
}
/**
* Reads a TIFF array of DOUBLE 64-bit values and returns it as a double array.
*
* @param count Number of values to read
* @param value Offset from which to read
*/
protected double[] readDoubleArray(long count, long value) throws IOException {
_raf.seek(value);
double[] darray = new double[(int) count];
for (int i = 0; i < count; i++) {
darray[i] = ModuleBase.readDouble(_raf, _bigEndian);
}
return darray;
}
/**
* Reads a string value from the TIFF file.
*
* @param count Length of string
* @param value Offset of string
*/
protected String readASCII(long count, long value) throws IOException {
_raf.seek(value);
byte[] buffer = new byte[(int) count];
_raf.read(buffer);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < count; i++) {
if (buffer[i] == 0) {
break;
}
sb.append((char) buffer[i]);
}
return sb.toString();
}
/** Reads an array of SRATIONAL values and returns it as an array of Rational. */
protected Rational[] readSignedRationalArray(long count, long value) throws IOException {
_raf.seek(value);
byte[] buffer = new byte[(int) calcValueSize(SRATIONAL, count)];
_raf.read(buffer);
DataInputStream stream = new DataInputStream(new ByteArrayInputStream(buffer));
Rational[] rarray = new Rational[(int) count];
for (int i = 0; i < count; i++) {
long numer = ModuleBase.readSignedInt(stream, _bigEndian, null);
long denom = ModuleBase.readSignedInt(stream, _bigEndian, null);
rarray[i] = new Rational(numer, denom);
}
return rarray;
}
/** Reads and returns a single unsigned 16-bit value. */
protected int readShort(int type, long count, long value) throws IOException {
_raf.seek(value);
return (int) readUnsigned(type);
}
/**
* Reads and returns a single unsigned 32-bit integer value.
*
* @param type TIFF type to read; must be a 32-bit type
* @param count Unused
* @param value Offset from which to read
*/
protected long readLong(int type, long count, long value) throws IOException {
_raf.seek(value);
return readUnsigned(type);
}
/**
* Reads an array of bytes and returns it as a byte array.
*
* @param type Unused
* @param count Number of bytes to read
* @param value Offset from which to read
*/
protected byte[] readTrueByteArray(int type, long count, long value) throws IOException {
_raf.seek(value);
byte[] array = new byte[(int) count];
_raf.read(array);
return array;
}
/**
* Parse the IFD. Errors are not suppressed.
*
* @param byteOffsetIsValid If true, allow offsets on odd byte boundaries
* @return The offset of the next IFD
*/
public long parse(boolean byteOffsetIsValid) throws TiffException {
/* Start at the IFD offset, read the number of entries, then
* read the entire IFD.
*/
long offset = _offset;
_next = 0L;
byte[] buffer;
int nFields = 0;
try {
_raf.seek(offset);
nFields = ModuleBase.readUnsignedShort(_raf, _bigEndian);
offset += 2;
int len = 12 * nFields;
buffer = new byte[len];
_raf.read(buffer, 0, len);
/* Read the offset of the next IFD (or 0 if none). */
offset += len;
_next = ModuleBase.readUnsignedInt(_raf, _bigEndian);
} catch (Exception e) {
throw new TiffException("Premature EOF", offset);
}
DataInputStream ifdStream = new DataInputStream(new ByteArrayInputStream(buffer));
try {
int prevTag = 0;
for (int i = 0; i < nFields; i++) {
int tag = ModuleBase.readUnsignedShort(ifdStream, _bigEndian, null);
/* Tags must be in ascending numerical order. */
if (!debug_allowoutofsequence && tag < prevTag) {
_info.setMessage(
new ErrorMessage("Tag " + tag + " out of sequence", _offset + 2 + 12 * i));
_info.setWellFormed(false);
}
prevTag = tag;
int type = ModuleBase.readUnsignedShort(ifdStream, _bigEndian, null);
/* Skip over tags with unknown type. */
if (type < BYTE || type > IFD) {
_info.setMessage(
new ErrorMessage(
"Unknown data type", "Type = " + type + ", Tag = " + tag, _offset + 4 + 12 * i));
} else {
/* Type gives indication of the TIFF version. */
if (SBYTE <= type && type <= IFD) {
_version = 6;
}
long count = ModuleBase.readUnsignedInt(ifdStream, _bigEndian, null);
long value = ModuleBase.readUnsignedInt(ifdStream, _bigEndian, null);
if (calcValueSize(type, count) > 4) {
/* Value is the word-aligned offset of the actual
* value. */
if ((value & 1) != 0) {
if (byteOffsetIsValid) {
_info.setMessage(
new InfoMessage(
"Value offset not word-aligned: " + value, _offset + 10 + 12 * i));
} else {
throw new TiffException(
"Value offset not " + "word-aligned: " + value, _offset + 10 + 12 * i);
}
}
} else {
/* Value is the actual value; pass the offset of
* the value. */
value = _offset + 10 + 12 * i;
}
lookupTag(tag, type, count, value);
}
}
} catch (IOException e) {
throw new TiffException("Read error", _offset + 2);
}
postParseInitialization();
return _next;
}