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rvation.jhove.jhove-apps.1.16.7.source-code.GDump Maven / Gradle / Ivy
/**********************************************************************
* GDump - JSTOR/Harvard Object Validation Environment
* Copyright 2004 by the President and Fellows of Harvard College
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
**********************************************************************/
import edu.harvard.hul.ois.jhove.*;
import java.io.*;
//import java.util.*;
/**
* Dump contents of GIF file in human-readable format.
*/
public class GDump
extends Dump
{
/******************************************************************
* MAIN ENTRY POINT.
******************************************************************/
/**
* Main entry point.
* @param args Command line arguments
*/
public static void main (String [] args)
{
if (args.length < 1) {
System.err.println ("usage: java GDump file");
System.exit (-1);
}
try {
FileInputStream file = new FileInputStream (args[0]);
BufferedInputStream buffer = new BufferedInputStream (file);
DataInputStream stream = new DataInputStream (buffer);
boolean bigEndian = false;
String signature = readChars (stream, 3);
String version = readChars (stream, 3);
System.out.println ("00000000: \"" + signature + version + "\"");
int width = ModuleBase.readUnsignedShort(stream, bigEndian, null);
int height = ModuleBase.readUnsignedShort(stream, bigEndian, null);
int packedFields = stream.readUnsignedByte ();
int backgroundColor = stream.readUnsignedByte ();
int aspectRatio = stream.readUnsignedByte ();
System.out.println ("00000006: LogicalScreenDescriptor: " +
width + "x" + height + " 0x" +
leading (packedFields, 2) +
Integer.toHexString (packedFields) + " " +
backgroundColor + " " + aspectRatio);
long os = 13;
boolean globalColorTable = (packedFields & 0x80) != 0;
int globalColorTableSize = packedFields & 0x07;
if (globalColorTable) {
System.out.println (leading (os, 8) + os +
": GlobalColorTable:");
os = colorTable (stream, os, globalColorTableSize);
}
for (int op = 0; (op = stream.readUnsignedByte ()) != -1;) {
if (op == 0x00) {
System.out.println (leading (os, 8) + os +
": BlockTerminator");
os++;
}
else if (op == 0x2c) {
int imageLeft = ModuleBase.readUnsignedShort (stream,
bigEndian,
null);
int imageTop = ModuleBase.readUnsignedShort (stream,
bigEndian,
null);
int imageWidth = ModuleBase.readUnsignedShort (stream,
bigEndian,
null);
int imageHeight = ModuleBase.readUnsignedShort (stream,
bigEndian,
null);
packedFields = stream.readUnsignedByte ();
System.out.println (leading (os, 8) + os +
": ImageDescriptor: " + imageLeft +
"," + imageTop + " " + imageWidth +
"x" + imageHeight + " 0x" +
leading (packedFields, 2) +
Integer.toHexString (packedFields));
os += 10;
boolean localColorTable = (packedFields & 0x80) != 0;
int localColorTableSize = packedFields & 0x07;
if (localColorTable) {
System.out.println (leading (os, 8) + os +
": LocalColorTable:");
os = colorTable (stream, os, localColorTableSize);
}
int size = stream.readUnsignedByte ();
System.out.println (leading (os, 8) + os +
": ImageData: " + size);
os = subBlocks (stream, ++os);
}
else if (op == 0x21) {
int label = stream.readUnsignedByte ();
if (label == 0x01) {
int blockSize = stream.readUnsignedByte ();
int gridLeft = ModuleBase.readUnsignedShort(stream,
bigEndian,
null);
int gridTop = ModuleBase.readUnsignedShort(stream,
bigEndian,
null);
int gridWidth = ModuleBase.readUnsignedShort(stream,
bigEndian,
null);
int gridHeight= ModuleBase.readUnsignedShort(stream,
bigEndian,
null);
int cellWidth = stream.readUnsignedByte ();
int cellHeight = stream.readUnsignedByte ();
int foreground = stream.readUnsignedByte ();
int background = stream.readUnsignedByte ();
System.out.println (leading (os, 8) + os +
": PlainTextExtension: " +
blockSize + " " + gridLeft + "," +
gridTop + " " + gridWidth + "x" +
gridHeight + " " + cellWidth +
"x" + cellHeight + " " +
foreground + "," + background);
os += 15;
os = subBlocks (stream, os);
}
else if (label == 0xf9) {
int blockSize = stream.readUnsignedByte ();
packedFields = stream.readUnsignedByte ();
int delayTime = ModuleBase.readUnsignedShort(stream,
bigEndian,
null);
int colorIndex= stream.readUnsignedByte ();
System.out.println (leading (os, 8) + os +
": GraphicControlExtension: " +
blockSize + " 0x" +
leading (packedFields, 2) +
packedFields + " " + delayTime +
" " + colorIndex);
os += 7;
}
else if (label == 0xfe) {
System.out.println (leading (os, 8) + os +
": CommentExtension: \"" +
"\"");
os += 2;
os = subBlocks (stream, os);
}
else if (label == 0xff) {
int blockSize = stream.readUnsignedByte ();
String appId = readChars (stream, 8);
int [] authCode = new int [3];
authCode[0] = stream.readUnsignedByte ();
authCode[1] = stream.readUnsignedByte ();
authCode[2] = stream.readUnsignedByte ();
System.out.println (leading (os, 8) + os +
": ApplicationExtension: " +
blockSize + " \"" + appId +
"\" " + authCode[0] + "," +
authCode[1] + "," + authCode[2]);
os += 14;
os = subBlocks (stream, os);
}
else {
String hex = Integer.toHexString (label);
System.out.println (leading (os-1, 8) + (os-1) +
": Unknown extension block: 0x" +
leading (hex, 2) + hex);
os += 2;
}
}
else if (op == 0x3b) {
System.out.println (leading (os, 8) + os +
": Trailer: 0x3b");
os++;
break;
}
else {
String hex = Integer.toHexString (op);
System.out.println (leading (os, 8) + os +
": Unknown block: 0x" +
leading (hex, 2) + hex);
os++;
}
}
stream.close ();
}
catch (Exception e) {
e.printStackTrace (System.err);
System.exit (-2);
}
}
/**
* Read and display a color table.
* @param stream Data input stream
* @param os Current byte offset
* @param size Color table size
* @return Updated byte offset
*/
private static long colorTable (DataInputStream stream, long os, int size)
throws IOException
{
int n = 2<
