/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: FontFileReader.java 489450 2006-12-21 19:54:40Z spepping $ */
package org.newdawn.slick.tools.hiero.truetype;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* Reads a TrueType font file into a byte array and
* provides file like functions for array access.
*/
public class FontFileReader {
/** The size of the file */
private int fsize; // file size
/** The current position in the file */
private int current; // current position in file
/** The file contents */
private byte[] file;
/**
* Initializes class and reads stream. Init does not close stream.
*
* @param in InputStream to read from new array with size + inc
* @throws IOException In case of an I/O problem
*/
private void init(InputStream in) throws java.io.IOException {
if (in.available() > 2000000) {
throw new IOException("Font too big");
}
this.file = IOUtils.toByteArray(in);
this.fsize = this.file.length;
if (fsize > 2000000) {
throw new IOException("Font too big");
}
this.current = 0;
}
/**
* Constructor
*
* @param fileName filename to read
* @throws IOException In case of an I/O problem
*/
public FontFileReader(String fileName) throws IOException {
final File f = new File(fileName);
if (f.length() > 2000000) {
throw new IOException("Font too big");
}
InputStream in = new java.io.FileInputStream(f);
try {
init(in);
} finally {
in.close();
}
}
/**
* Generate a font file reader based on the contents of a byte array rather than
* an actual file
*
* @param data The data to use as the font file
* @throws IOException Indicates a failure to process the array
*/
public FontFileReader(byte[] data) throws IOException {
file = data;
this.fsize = this.file.length;
if (fsize > 2000000) {
throw new IOException("Font too big");
}
this.current = 0;
}
/**
* Constructor
*
* @param in InputStream to read from
* @throws IOException In case of an I/O problem
*/
public FontFileReader(InputStream in) throws IOException {
init(in);
}
/**
* Set current file position to offset
*
* @param offset The new offset to set
* @throws IOException In case of an I/O problem
*/
public void seekSet(long offset) throws IOException {
if (offset >= fsize || offset < 0) {
throw new java.io.EOFException("Reached EOF, file size=" + fsize
+ " offset=" + offset);
}
current = (int)offset;
}
/**
* Set current file position to offset
*
* @param add The number of bytes to advance
* @throws IOException In case of an I/O problem
*/
public void seekAdd(long add) throws IOException {
seekSet(current + add);
}
/**
* Skip a given number of bytes.
*
* @param add The number of bytes to advance
* @throws IOException In case of an I/O problem
*/
public void skip(long add) throws IOException {
seekAdd(add);
}
/**
* Returns current file position.
*
* @return int The current position.
*/
public int getCurrentPos() {
return current;
}
/**
* Returns the size of the file.
*
* @return int The filesize
*/
public int getFileSize() {
return fsize;
}
/**
* Read 1 byte.
*
* @return One byte
* @throws IOException If EOF is reached
*/
public byte read() throws IOException {
if (current >= fsize) {
throw new java.io.EOFException("Reached EOF, file size=" + fsize);
}
final byte ret = file[current++];
return ret;
}
/**
* Read 1 signed byte.
*
* @return One byte
* @throws IOException If EOF is reached
*/
public final byte readTTFByte() throws IOException {
return read();
}
/**
* Read 1 unsigned byte.
*
* @return One unsigned byte
* @throws IOException If EOF is reached
*/
public final int readTTFUByte() throws IOException {
final byte buf = read();
if (buf < 0) {
return (256 + buf);
} else {
return buf;
}
}
/**
* Read 2 bytes signed.
*
* @return One signed short
* @throws IOException If EOF is reached
*/
public final short readTTFShort() throws IOException {
final int ret = (readTTFUByte() << 8) + readTTFUByte();
final short sret = (short)ret;
return sret;
}
/**
* Read 2 bytes unsigned.
*
* @return One unsigned short
* @throws IOException If EOF is reached
*/
public final int readTTFUShort() throws IOException {
final int ret = (readTTFUByte() << 8) + readTTFUByte();
return ret;
}
/**
* Write a USHort at a given position.
*
* @param pos The absolute position to write to
* @param val The value to write
* @throws IOException If EOF is reached
*/
public final void writeTTFUShort(int pos, int val) throws IOException {
if ((pos + 2) > fsize) {
throw new java.io.EOFException("Reached EOF");
}
final byte b1 = (byte)((val >> 8) & 0xff);
final byte b2 = (byte)(val & 0xff);
file[pos] = b1;
file[pos + 1] = b2;
}
/**
* Read 2 bytes signed at position pos without changing current position.
*
* @param pos The absolute position to read from
* @return One signed short
* @throws IOException If EOF is reached
*/
public final short readTTFShort(long pos) throws IOException {
final long cp = getCurrentPos();
seekSet(pos);
final short ret = readTTFShort();
seekSet(cp);
return ret;
}
/**
* Read 2 bytes unsigned at position pos without changing current position.
*
* @param pos The absolute position to read from
* @return One unsigned short
* @throws IOException If EOF is reached
*/
public final int readTTFUShort(long pos) throws IOException {
long cp = getCurrentPos();
seekSet(pos);
int ret = readTTFUShort();
seekSet(cp);
return ret;
}
/**
* Read 4 bytes.
*
* @return One signed integer
* @throws IOException If EOF is reached
*/
public final int readTTFLong() throws IOException {
long ret = readTTFUByte(); // << 8;
ret = (ret << 8) + readTTFUByte();
ret = (ret << 8) + readTTFUByte();
ret = (ret << 8) + readTTFUByte();
return (int)ret;
}
/**
* Read 4 bytes.
*
* @return One unsigned integer
* @throws IOException If EOF is reached
*/
public final long readTTFULong() throws IOException {
long ret = readTTFUByte();
ret = (ret << 8) + readTTFUByte();
ret = (ret << 8) + readTTFUByte();
ret = (ret << 8) + readTTFUByte();
return ret;
}
/**
* Read a NUL terminated ISO-8859-1 string.
*
* @return A String
* @throws IOException If EOF is reached
*/
public final String readTTFString() throws IOException {
int i = current;
while (file[i++] != 0) {
if (i > fsize) {
throw new java.io.EOFException("Reached EOF, file size="
+ fsize);
}
}
byte[] tmp = new byte[i - current];
System.arraycopy(file, current, tmp, 0, i - current);
return new String(tmp, "ISO-8859-1");
}
/**
* Read an ISO-8859-1 string of len bytes.
*
* @param len The length of the string to read
* @return A String
* @throws IOException If EOF is reached
*/
public final String readTTFString(int len) throws IOException {
if ((len + current) > fsize) {
throw new java.io.EOFException("Reached EOF, file size=" + fsize);
}
byte[] tmp = new byte[len];
System.arraycopy(file, current, tmp, 0, len);
current += len;
final String encoding;
if ((tmp.length > 0) && (tmp[0] == 0)) {
encoding = "UTF-16BE";
} else {
encoding = "ISO-8859-1";
}
return new String(tmp, encoding);
}
/**
* Return a copy of the internal array
*
* @param offset The absolute offset to start reading from
* @param length The number of bytes to read
* @return An array of bytes
* @throws IOException if out of bounds
*/
public byte[] getBytes(int offset,
int length) throws IOException {
if ((offset + length) > fsize) {
throw new java.io.IOException("Reached EOF");
}
byte[] ret = new byte[length];
System.arraycopy(file, offset, ret, 0, length);
return ret;
}
}