diff options
Diffstat (limited to 'src/main/java/org/pdfbox/ttf/TTFDataStream.java')
| -rw-r--r-- | src/main/java/org/pdfbox/ttf/TTFDataStream.java | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/ttf/TTFDataStream.java b/src/main/java/org/pdfbox/ttf/TTFDataStream.java new file mode 100644 index 0000000..c4cf19d --- /dev/null +++ b/src/main/java/org/pdfbox/ttf/TTFDataStream.java @@ -0,0 +1,253 @@ +/**
+ * Copyright (c) 2004-2005, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.ttf;
+
+import java.io.EOFException;
+import java.io.IOException;
+
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+
+import org.pdfbox.pdmodel.common.PDStream;
+
+/**
+ * An interface into a data stream.
+ *
+ * @author Ben Litchfield (ben@benlitchfield.com)
+ * @version $Revision: 1.5 $
+ */
+public abstract class TTFDataStream
+{
+
+ /**
+ * Read a 16.16 fixed value, where the first 16 bits are the decimal and the last
+ * 16 bits are the fraction.
+ * @return A 32 bit value.
+ * @throws IOException If there is an error reading the data.
+ */
+ public float read32Fixed() throws IOException
+ {
+ float retval = 0;
+ retval = readSignedShort();
+ retval += (readUnsignedShort()/65536);
+ return retval;
+ }
+
+ /**
+ * Read a fixed length ascii string.
+ * @param length The length of the string to read.
+ * @return A string of the desired length.
+ * @throws IOException If there is an error reading the data.
+ */
+ public String readString( int length ) throws IOException
+ {
+ return readString( length, "ISO-8859-1" );
+ }
+
+ /**
+ * Read a fixed length ascii string.
+ * @param length The length of the string to read in bytes.
+ * @param charset The expected character set of the string.
+ * @return A string of the desired length.
+ * @throws IOException If there is an error reading the data.
+ */
+ public String readString( int length, String charset ) throws IOException
+ {
+ byte[] buffer = read( length );
+ return new String(buffer, charset);
+ }
+
+ /**
+ * Read an unsigned byte.
+ * @return An unsigned byte.
+ * @throws IOException If there is an error reading the data.
+ */
+ public abstract int read() throws IOException;
+
+ /**
+ * Read an unsigned byte.
+ * @return An unsigned byte.
+ * @throws IOException If there is an error reading the data.
+ */
+ public abstract long readLong() throws IOException;
+
+
+ /**
+ * Read a signed byte.
+ * @return A signed byte.
+ * @throws IOException If there is an error reading the data.
+ */
+ public int readSignedByte() throws IOException
+ {
+ int signedByte = read();
+ return signedByte < 127 ? signedByte : signedByte-256;
+ }
+
+ /**
+ * Read an unsigned integer.
+ * @return An unsiged integer.
+ * @throws IOException If there is an error reading the data.
+ */
+ public long readUnsignedInt() throws IOException
+ {
+ long byte1 = read();
+ long byte2 = read();
+ long byte3 = read();
+ long byte4 = read();
+ if( byte4 < 0 )
+ {
+ throw new EOFException();
+ }
+ return (byte1 << 24) + (byte2 << 16) + (byte3 << 8) + (byte4 << 0);
+ }
+
+ /**
+ * Read an unsigned short.
+ *
+ * @return An unsigned short.
+ * @throws IOException If there is an error reading the data.
+ */
+ public abstract int readUnsignedShort() throws IOException;
+
+ /**
+ * Read an unsigned short array.
+ *
+ * @param length The length of the array to read.
+ * @return An unsigned short array.
+ * @throws IOException If there is an error reading the data.
+ */
+ public int[] readUnsignedShortArray( int length ) throws IOException
+ {
+ int[] array = new int[ length ];
+ for( int i=0; i<length; i++ )
+ {
+ array[i] = readUnsignedShort();
+ }
+ return array;
+ }
+
+ /**
+ * Read an signed short.
+ *
+ * @return An signed short.
+ * @throws IOException If there is an error reading the data.
+ */
+ public abstract short readSignedShort() throws IOException;
+
+ /**
+ * Read an eight byte international date.
+ *
+ * @return An signed short.
+ * @throws IOException If there is an error reading the data.
+ */
+ public Calendar readInternationalDate() throws IOException
+ {
+ long secondsSince1904 = readLong();
+ GregorianCalendar cal = new GregorianCalendar( 1904, 0, 1 );
+ long millisFor1904 = cal.getTimeInMillis();
+ millisFor1904 += (secondsSince1904*1000);
+ cal.setTimeInMillis( millisFor1904 );
+ return cal;
+ }
+
+ /**
+ * Close the underlying resources.
+ *
+ * @throws IOException If there is an error closing the resources.
+ */
+ public abstract void close() throws IOException;
+
+ /**
+ * Seek into the datasource.
+ *
+ * @param pos The position to seek to.
+ * @throws IOException If there is an error seeking to that position.
+ */
+ public abstract void seek(long pos) throws IOException;
+
+ /**
+ * Read a specific number of bytes from the stream.
+ * @param numberOfBytes The number of bytes to read.
+ * @return The byte buffer.
+ * @throws IOException If there is an error while reading.
+ */
+ public byte[] read( int numberOfBytes ) throws IOException
+ {
+ byte[] data = new byte[ numberOfBytes ];
+ int amountRead = 0;
+ int totalAmountRead = 0;
+ while( (amountRead = read( data, totalAmountRead, numberOfBytes-totalAmountRead ) ) != -1 &&
+ totalAmountRead < numberOfBytes )
+ {
+ totalAmountRead += amountRead;
+ //read at most numberOfBytes bytes from the stream.
+ }
+ return data;
+ }
+
+ /**
+ * @see java.io.InputStream#read( byte[], int, int )
+ *
+ * @param b The buffer to write to.
+ * @param off The offset into the buffer.
+ * @param len The length into the buffer.
+ *
+ * @return The number of bytes read.
+ *
+ * @throws IOException If there is an error reading from the stream.
+ */
+ public abstract int read(byte[] b,
+ int off,
+ int len)
+ throws IOException;
+
+ /**
+ * Get the current position in the stream.
+ * @return The current position in the stream.
+ * @throws IOException If an error occurs while reading the stream.
+ */
+ public abstract long getCurrentPosition() throws IOException;
+
+ /**
+ * Get a COSStream from this TTFDataStream
+ * This permit to pass the data read from an
+ * external source to the COSObjects to keep
+ * a certain persistence layer between specialized
+ * objects like the TTF package and the pdmodel package.
+ *
+ * Created by Pascal Allain
+ * Vertical7 Inc.
+ *
+ * @return COSStream describing this stream
+ */
+ public abstract PDStream getPDStream();
+
+}
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