995 lines
36 KiB
Java
995 lines
36 KiB
Java
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/*
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* FileAnalysis.java
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*
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* Created on 27-Apr-2011, 11:14:48
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*/
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package stegsolve;
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import java.io.*;
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import java.util.zip.CRC32;
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/**
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* File Analysis by examining the file format
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* @author Caesum
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*/
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public class FileAnalysis extends javax.swing.JFrame {
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/**
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* String containing the file analysis report
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*/
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private StringBuilder rep;
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/**
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* The file in bytes
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*/
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private byte [] f = null;
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/** Creates new form FileAnalysis */
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public FileAnalysis(File ifile) {
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initComponents();
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analyse_file(ifile);
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}
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/**
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* Reads the data from the file and compiles
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* the analysis report
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* @param ifile File to analyse
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*/
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private void analyse_file(File ifile)
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{
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rep = new StringBuilder();
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rep.append("<html><center><b>");
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rep.append("文件格式报告");
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rep.append("</b></center>");
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rep.append(("<br>文件: "+ifile.getName()));
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try{
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FileInputStream fis = new FileInputStream(ifile);
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f = new byte[(int)ifile.length()];
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fis.read(f);
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rep.append(("<br>Read "+Integer.toHexString(f.length)+" bytes"));
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analyse();
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}
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catch(Exception e)
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{
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rep.append(("读取文件时出错: "+e.toString()));
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}
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rep.append("</html>");
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report.setText(rep.toString());
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}
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/**
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* Checks the header and chooses the correct subtype
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* for analysis
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*/
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private void analyse()
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{
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// analyse f, write report to rep
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if(f.length<4)
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{
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rep.append("<br>文件太短？");
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return;
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}
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if(f[0] == 'B' && f[1] == 'M')
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analyse_bmp();
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else if(f[0]==(byte)137 && f[1]==(byte)80 && f[2]==78 && f[3]==71)
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analyse_png();
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else if(f.length>=6 && f[0]=='G' && f[1]=='I' && f[2]=='F' && f[3]=='8' && (f[4]=='7' ||
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f[4]=='9') && f[5]=='a')
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analyse_gif();
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else if(f[0]==(byte)0xff && f[1]==(byte)0xd8)
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analyse_jpg();
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else rep.append("<br>文件格式分析代码尚未完成！");
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}
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/**
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* Analysis particular to a jpeg/jpg image
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*/
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private void analyse_jpg()
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{
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int cpos = 0;
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cpos = analyse_jpg_sections(cpos);
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if(cpos<f.length)
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{
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rep.append(("<br>文件末尾的附加字节数 = " +(f.length-cpos)));
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rep.append("<br>转储附加字节:");
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fdump(cpos, f.length);
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}
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}
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/**
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* Analyses one particular jpeg section
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* @param pos Position in the file
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* @return End position in the file
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*/
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private int analyse_jpg_sections(int pos)
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{
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if(f[pos]==(byte)0xff && f[pos+1]==(byte)0xd8)
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{
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rep.append("<br>图像的开头");
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pos+=2;
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xd9)
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{
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rep.append("<br><br>图像结尾");
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pos+=2;
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return pos;
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}
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else if(f[pos] == (byte) 0xff &&
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( (f[pos + 1] >= (byte) 0xc0 && f[pos + 1] <= (byte) 0xc3)
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|| (f[pos + 1] >= (byte) 0xc5 && f[pos + 1] <= (byte) 0xc7)
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|| (f[pos + 1] >= (byte) 0xc9 && f[pos + 1] <= (byte) 0xcb)
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|| (f[pos + 1] >= (byte) 0xcd && f[pos + 1] <= (byte) 0xcf)
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|| f[pos+1]==(byte)0xde))
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{
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if(f[pos+1]==(byte)0xc0)
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rep.append("<br><br>Start of frame : Baseline DCT");
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else if(f[pos + 1] == (byte) 0xc1)
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rep.append("<br><br>Start of frame : Extended sequential DCT");
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else if(f[pos + 1] == (byte) 0xc2)
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rep.append("<br><br>Start of frame : Progressive DCT");
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else if(f[pos + 1] == (byte) 0xc3)
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rep.append("<br><br>Start of frame : Lossless (sequential)");
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else if(f[pos + 1] == (byte) 0xc5)
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rep.append("<br><br>Start of frame : Differential sequential DCT");
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else if(f[pos + 1] == (byte) 0xc6)
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rep.append("<br><br>Start of frame : Differential progressive DCT");
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else if(f[pos + 1] == (byte) 0xc7)
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rep.append("<br><br>Start of frame : Differential lossless (sequential)");
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else if(f[pos + 1] == (byte) 0xc9)
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rep.append("<br><br>Start of frame : Extended sequential DCT");
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else if(f[pos + 1] == (byte) 0xca)
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rep.append("<br><br>Start of frame : Progressive DCT");
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else if(f[pos + 1] == (byte) 0xcb)
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rep.append("<br><br>Start of frame : Lossless (sequential)");
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else if(f[pos + 1] == (byte) 0xcd)
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rep.append("<br><br>Start of frame : Differential sequential DCT");
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else if(f[pos + 1] == (byte) 0xce)
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rep.append("<br><br>Start of frame : Differential progressive DCT");
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else if(f[pos + 1] == (byte) 0xcf)
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rep.append("<br><br>Start of frame : Differential lossless (sequential)");
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else if(f[pos + 1] == (byte) 0xde)
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rep.append("<br><br>Start of frame : DHP");
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if(f[pos+1]<(byte)0xc8)
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rep.append(" (Huffman coding)");
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else rep.append(" (arithmetic coding)");
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rep.append(("<br>Header Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append(("<br>Precision: " + Integer.toHexString(uf(pos+4))));
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rep.append(("<br>Image lines: " + Integer.toHexString(png_get_word(pos+5)) + " (" + png_get_word(pos+5) + ")"));
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rep.append(("<br>Samples per line: " + Integer.toHexString(png_get_word(pos+7)) + " (" + png_get_word(pos+7) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xc4)
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{
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rep.append("<br><br>Huffman table");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xcc)
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{
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rep.append("<br><br>Arithmetic coding conditioning");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] >= (byte) 0xd0 && f[pos + 1] <= (byte) 0xd7)
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{
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rep.append("<br><br>Restart interval");
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pos+=2;
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xda)
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{
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rep.append("<br><br>Start of scan");
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rep.append(("<br>Header Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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pos+=2+png_get_word(pos+2);
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int ct=pos;
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while(f[ct]!=(byte)0xff || (f[ct]==(byte)0xff && f[ct+1]==0)
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|| (f[ct]==(byte)0xff && f[ct+1]>=(byte)0xd0&&f[ct+1]<=(byte)0xd7))
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ct++;
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rep.append(("<br>Detected " + (ct-pos) + " bytes in scan"));
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pos=ct;
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xdb)
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{
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rep.append("<br><br>Quantisation table");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xdc)
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{
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rep.append("<br><br>Define number of lines");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append(" (Should be 4)");
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rep.append(("<br>Number: " + Integer.toHexString(png_get_word(pos+4)) + " (" + png_get_word(pos+4) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xdd)
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{
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rep.append("<br><br>Define Restart interval");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append(" (Should be 4)");
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rep.append(("<br>Interval: " + Integer.toHexString(png_get_word(pos+4)) + " (" + png_get_word(pos+4) + ")"));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xdf)
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{
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rep.append("<br><br>Expand reference components");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append(" (Should be 3)");
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rep.append(("<br>Value: " + Integer.toHexString(uf(pos+4))));
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] >= (byte) 0xe0 &&f[pos + 1] <= (byte) 0xef)
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{
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rep.append("<br><br>Application data");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append("<br>Dump of data:");
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fdump(pos+2,pos+2+png_get_word(pos+2)-1);
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xfe)
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{
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rep.append("<br><br>Comment data");
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rep.append(("<br>Length: " + Integer.toHexString(png_get_word(pos+2)) + " (" + png_get_word(pos+2) + ")"));
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rep.append("<br>Dump of data:");
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fdump(pos+2,pos+2+png_get_word(pos+2)-1);
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pos+=2+png_get_word(pos+2);
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}
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else if(f[pos] == (byte) 0xff && f[pos + 1] == (byte) 0xff)
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{
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pos++;
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}
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else return pos;
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return analyse_jpg_sections(pos);
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}
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/**
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* Analysis particular to a gif image
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*/
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private void analyse_gif()
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{
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if(f.length<13)
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{
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rep.append("<br>file too short?");
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return;
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}
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rep.append(("<br>Width: " + get_hword(6) + " (" + get_word(6) + ")"));
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rep.append(("<br>Height: " + get_hword(8) + " (" + get_word(8) + ")"));
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rep.append(("<br>Flags: " + Integer.toHexString(uf(10))));
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int flags = uf(10);
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int gctsize=0;
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if((flags&0x80)>0)
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{
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rep.append(" (Global Colour Table)");
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if((flags&0x10)>0) rep.append(" (Sorted GCT)");
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gctsize = 1<<(((flags&0x07)+1));
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rep.append((" (GCT Size = " + gctsize + ")"));
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}
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rep.append((" (Color Resolution = " + (((flags>>3)&0x03)+1) + ")"));
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rep.append(("<br>Background color index: " + uf(11)));
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rep.append(("<br>Pixel aspect ratio: " + uf(12)));
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int cpos = 13;
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if(f.length<cpos+gctsize*3)
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{
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rep.append("<br>file too short?");
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return;
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}
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if(gctsize>0)
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{
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rep.append("<br><br>Global Colour Table:");
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for(int i=0;i<gctsize;i++)
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{
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rep.append("<br>");
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for(int j=0;j<3;j++)
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{
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rep.append(m2(Integer.toHexString(uf(cpos + i * 3 + j))));
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rep.append(" ");
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}
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rep.append(" ");
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for(int j=0;j<3;j++)
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{
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char c=(char)uf(cpos + i * 3 + j);
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if(c<32||c>0x7f)c='.';
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rep.append((""+c));
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}
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}
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cpos+=gctsize*3;
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}
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cpos = check_gif_blocks(cpos);
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if(cpos<f.length)
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{
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rep.append(("<br>Additional bytes at end of file = " +(f.length-cpos)));
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rep.append("<br>Dump of additional bytes:");
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fdump(cpos, f.length);
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}
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}
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/**
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* Analysis of a gif block
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* @param pos Position in the file
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* @return Position after this block
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*/
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private int check_gif_blocks(int pos)
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{
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if(f[pos]==0x2c)
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{
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if(pos+10>=f.length) return pos;
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rep.append("<br><br>Image Descriptor");
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rep.append(("<br>Left: " + get_hword(pos+1) + " (" + get_word(pos+1) + ")"));
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rep.append(("<br>Top: " + get_hword(pos+3) + " (" + get_word(pos+3) + ")"));
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rep.append(("<br>Width: " + get_hword(pos+5) + " (" + get_word(pos+5) + ")"));
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|
|
rep.append(("<br>Height: " + get_hword(pos+7) + " (" + get_word(pos+7) + ")"));
|
||
|
|
rep.append(("<br>Flags: " + Integer.toHexString(uf(pos+9))));
|
||
|
|
int flags = uf(pos+9);
|
||
|
|
int lctsize = 0;
|
||
|
|
if((flags&128)>0)
|
||
|
|
{
|
||
|
|
rep.append(" (Local colour table)");
|
||
|
|
lctsize=1<<((flags&0x07)+1);
|
||
|
|
rep.append((" (LCT Size = " + lctsize + ""));
|
||
|
|
}
|
||
|
|
if((flags&64)>0) rep.append(" (Interlace)");
|
||
|
|
if((flags&32)>0) rep.append(" (Sort)");
|
||
|
|
if((flags&24)>0) rep.append(" (**Reserved flags set **)");
|
||
|
|
pos=pos+10;
|
||
|
|
if(f.length<pos+lctsize*3)
|
||
|
|
{
|
||
|
|
rep.append("<br>file too short?");
|
||
|
|
return pos;
|
||
|
|
}
|
||
|
|
if(lctsize>0)
|
||
|
|
{
|
||
|
|
rep.append("<br><br>Local Colour Table:");
|
||
|
|
for(int i=0;i<lctsize;i++)
|
||
|
|
{
|
||
|
|
rep.append("<br>");
|
||
|
|
for(int j=0;j<3;j++)
|
||
|
|
{
|
||
|
|
rep.append(m2(Integer.toHexString(uf(pos + i * 3 + j))));
|
||
|
|
rep.append(" ");
|
||
|
|
}
|
||
|
|
rep.append(" ");
|
||
|
|
for(int j=0;j<3;j++)
|
||
|
|
{
|
||
|
|
char c=(char)uf(pos + i * 3 + j);
|
||
|
|
if(c<32||c>0x7f)c='.';
|
||
|
|
rep.append((""+c));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
pos+=lctsize*3;
|
||
|
|
}
|
||
|
|
rep.append(("<br>LZW size = " + uf(pos)));
|
||
|
|
pos++;
|
||
|
|
while(uf(pos)>0) pos+=uf(pos)+1;
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
else if(f[pos]==0x21 && uf(pos+1)==0xf9)
|
||
|
|
{
|
||
|
|
if(pos+8>=f.length) return pos;
|
||
|
|
rep.append("<br><br>Graphic control extension");
|
||
|
|
rep.append(("<br>Size : " + uf(pos+2) + " (must be 4)"));
|
||
|
|
rep.append(("<br>Flags: " + Integer.toHexString(uf(pos+3))));
|
||
|
|
int flags = uf(pos+3);
|
||
|
|
if((flags&224)>0) rep.append(" (**Reserved flags set **)");
|
||
|
|
if((flags&1)>0) rep.append(" (Transparency flag)");
|
||
|
|
rep.append(("<br>Delay time: " + get_word(pos+4)));
|
||
|
|
rep.append(("<br>Transparent color index: " + uf(6)));
|
||
|
|
rep.append(("<br>Terminator: " + Integer.toHexString(uf(pos+7))));
|
||
|
|
pos=pos+8;
|
||
|
|
}
|
||
|
|
else if(f[pos]==0x21 && uf(pos+1)==0xfe)
|
||
|
|
{
|
||
|
|
if(pos+3>=f.length) return pos;
|
||
|
|
rep.append("<br><br>Comment extension");
|
||
|
|
rep.append("<br>Dump of data:");
|
||
|
|
pos+=2;
|
||
|
|
while(uf(pos)>0)
|
||
|
|
{
|
||
|
|
fdump(pos+1,pos+uf(pos));
|
||
|
|
pos += uf(pos) + 1;
|
||
|
|
}
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
else if(f[pos]==0x21 && uf(pos+1)==0x01)
|
||
|
|
{
|
||
|
|
if(pos+16>=f.length) return pos;
|
||
|
|
rep.append("<br><br>Plain Text extension");
|
||
|
|
rep.append(("<br>Size : " + uf(pos+2) + " (must be 12)"));
|
||
|
|
rep.append(("<br>Left: " + get_hword(pos+3) + " (" + get_word(pos+3) + ")"));
|
||
|
|
rep.append(("<br>Top: " + get_hword(pos+5) + " (" + get_word(pos+5) + ")"));
|
||
|
|
rep.append(("<br>Width: " + get_hword(pos+7) + " (" + get_word(pos+7) + ")"));
|
||
|
|
rep.append(("<br>Height: " + get_hword(pos+9) + " (" + get_word(pos+9) + ")"));
|
||
|
|
rep.append(("<br>Cell Width : " + uf(pos+11)));
|
||
|
|
rep.append(("<br>Cell Height : " + uf(pos+12)));
|
||
|
|
rep.append(("<br>Foreground Color Index : " + uf(pos+13)));
|
||
|
|
rep.append(("<br>Background Color Index : " + uf(pos+14)));
|
||
|
|
rep.append("<br>Dump of data:");
|
||
|
|
pos+=15;
|
||
|
|
while(uf(pos)>0)
|
||
|
|
{
|
||
|
|
fdump(pos+1,pos+uf(pos));
|
||
|
|
pos += uf(pos) + 1;
|
||
|
|
}
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
else if(f[pos]==0x21 && uf(pos+1)==0xff)
|
||
|
|
{
|
||
|
|
if(pos+14>=f.length) return pos;
|
||
|
|
rep.append("<br><br>Application extension");
|
||
|
|
rep.append(("<br>Size : " + uf(pos+2) + " (must be 11)"));
|
||
|
|
rep.append("<br>Identifier:");
|
||
|
|
fdump(pos+3,pos+10);
|
||
|
|
rep.append("<br>Authentication code:");
|
||
|
|
fdump(pos+11,pos+13);
|
||
|
|
rep.append("<br>Application data:");
|
||
|
|
pos+=14;
|
||
|
|
while(uf(pos)>0)
|
||
|
|
{
|
||
|
|
fdump(pos+1,pos+uf(pos));
|
||
|
|
pos += uf(pos) + 1;
|
||
|
|
}
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
else if(f[pos]==0x3b)
|
||
|
|
{
|
||
|
|
rep.append("<br><br>Trailer block");
|
||
|
|
return pos+1;
|
||
|
|
}
|
||
|
|
else return pos;
|
||
|
|
return check_gif_blocks(pos);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Analysis particular to a png file
|
||
|
|
*/
|
||
|
|
private void analyse_png()
|
||
|
|
{
|
||
|
|
if(f.length<8)
|
||
|
|
{
|
||
|
|
rep.append("<br>file too short?");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if(f[4]!=13||f[5]!=10||f[6]!=26||f[7]!=10)
|
||
|
|
{
|
||
|
|
rep.append("<br>Error in header, bytes 5-8 should be 0d 0a 1a 0a");
|
||
|
|
}
|
||
|
|
int cpos = check_png_chunks(8);
|
||
|
|
if(cpos<f.length)
|
||
|
|
{
|
||
|
|
rep.append(("<br>Additional bytes at end of file = " +(f.length-cpos)));
|
||
|
|
rep.append("<br>Dump of additional bytes:");
|
||
|
|
fdump(cpos, f.length);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Analyse png chunks
|
||
|
|
* @param start Position in the file
|
||
|
|
* @return Position after the chunks
|
||
|
|
*/
|
||
|
|
private int check_png_chunks(int start)
|
||
|
|
{
|
||
|
|
if(start+12>f.length)
|
||
|
|
{
|
||
|
|
rep.append("<br>Premature end to file?");
|
||
|
|
return start;
|
||
|
|
}
|
||
|
|
int length = png_get_dword(start);
|
||
|
|
rep.append("<br><br>Chunk: ");
|
||
|
|
if((f[4]&64)>0)
|
||
|
|
{
|
||
|
|
rep.append("<br>Ancillary - provides additional information");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
rep.append("<br>Critical - necessary for display of image MUST BE recognized to proceed");
|
||
|
|
}
|
||
|
|
if((f[5]&64)>0)
|
||
|
|
{
|
||
|
|
rep.append("<br>Private, investigate this!!");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
rep.append("<br>Public");
|
||
|
|
}
|
||
|
|
if((f[6]&64)>0)
|
||
|
|
{
|
||
|
|
rep.append("<br>Chunk has a reserved flag set, **investigate this**!");
|
||
|
|
}
|
||
|
|
if((f[7]&64)>0)
|
||
|
|
{
|
||
|
|
rep.append("<br>Safe to copy, chunk may propagate to other files");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
rep.append("<br>Unsafe to copy unless known to software");
|
||
|
|
}
|
||
|
|
fdump(start+4,start+7);
|
||
|
|
rep.append(("<br>Data length = "+length + " bytes"));
|
||
|
|
rep.append(("<br>CRC = "+png_get_hdword(start+8+length)));
|
||
|
|
CRC32 cc = new CRC32();
|
||
|
|
cc.reset();
|
||
|
|
cc.update(f,start+4,4+length);
|
||
|
|
if((int)cc.getValue()!=png_get_dword(start+8+length))
|
||
|
|
{
|
||
|
|
rep.append("<br>Calculated CRC = " + Integer.toHexString((int)cc.getValue()));
|
||
|
|
}
|
||
|
|
if(start+12+length>f.length)
|
||
|
|
{
|
||
|
|
rep.append("<br>Not enough room in file for data?");
|
||
|
|
return start;
|
||
|
|
}
|
||
|
|
int typ = png_get_dword(start+4);
|
||
|
|
if(typ==0x49454E44) // IEND
|
||
|
|
return start + 12;
|
||
|
|
else if(typ == 0x49484452) // IHDR
|
||
|
|
{
|
||
|
|
rep.append(("<br>Width: " + png_get_hdword(start+8) + " ("+png_get_dword(start+8)+")"));
|
||
|
|
rep.append(("<br>Height: " + png_get_hdword(start+12) + " ("+png_get_dword(start+12)+")"));
|
||
|
|
rep.append(("<br>Bit Depth: " + f[start+16]));
|
||
|
|
rep.append(("<br>Color Type: " + f[start+17]));
|
||
|
|
if(f[start+17]==0) rep.append(" (Grayscale)");
|
||
|
|
if(f[start+17]==2) rep.append(" (RGB Triples)");
|
||
|
|
if(f[start+17]==3) rep.append(" (Palette Indexed)");
|
||
|
|
if(f[start+17]==4) rep.append(" (Grayscale + Alpha)");
|
||
|
|
if(f[start+17]==6) rep.append(" (RGB + Alpha)");
|
||
|
|
rep.append(("<br>Compression Method: " + f[start+18]));
|
||
|
|
if(f[start+18]==0) rep.append(" (deflate)");
|
||
|
|
else rep.append(" (unknown)");
|
||
|
|
rep.append(("<br>Filter Method: " + f[start+19]));
|
||
|
|
if(f[start+19]==0) rep.append(" (adaptive)");
|
||
|
|
else rep.append(" (unknown)");
|
||
|
|
rep.append(("<br>Interlace Method: " + f[start+20]));
|
||
|
|
if(f[start+20]==0) rep.append(" (none)");
|
||
|
|
else if(f[start + 20] == 1) rep.append(" (adam7)");
|
||
|
|
else rep.append(" (unknown)");
|
||
|
|
}
|
||
|
|
else if(typ == 0x504C5445) //PLTE
|
||
|
|
{
|
||
|
|
rep.append(("<br>Palette contains " + (length/3) +
|
||
|
|
" RGB entries, NB if colortype is 2 or 6 this could be hiding something."));
|
||
|
|
rep.append("<br>Dump of palette:");
|
||
|
|
for(int i=0;i<length/3;i++)
|
||
|
|
{
|
||
|
|
rep.append("<br>");
|
||
|
|
for(int j=0;j<4;j++)
|
||
|
|
{
|
||
|
|
rep.append(m2(Integer.toHexString(uf(start+8 + i * 3 + j))));
|
||
|
|
rep.append(" ");
|
||
|
|
}
|
||
|
|
rep.append(" ");
|
||
|
|
for(int j=0;j<3;j++)
|
||
|
|
{
|
||
|
|
char c=(char)uf(start+8 + i * 3 + j);
|
||
|
|
if(c<32||c>0x7f)c='.';
|
||
|
|
rep.append((""+c));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if(typ == 0x49444154) //IDAT
|
||
|
|
{
|
||
|
|
rep.append("<br>Image data, compressed");
|
||
|
|
}
|
||
|
|
else if(typ == 0x624B4744) //bKGD
|
||
|
|
{
|
||
|
|
rep.append("<br>Background data, optional");
|
||
|
|
rep.append("<br>NB: should be after PLTE chunk and before first IDAT");
|
||
|
|
if(length!=1&&length!=2&&length!=6)
|
||
|
|
rep.append("<br>Alert: Length should be 1, 2 or 6 bytes");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x6348524D) //cHRM
|
||
|
|
{
|
||
|
|
rep.append("<br>Primary chromaticities and white point");
|
||
|
|
rep.append("<br>NB data represents 4 points for white,red,green,blue");
|
||
|
|
rep.append("<br>x coordinates and y coordinates");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x67414D41) //gAMA
|
||
|
|
{
|
||
|
|
rep.append("<br>Image gamma value");
|
||
|
|
rep.append(("<br>"+get_dword(start+8)));
|
||
|
|
}
|
||
|
|
else if(typ == 0x68495354) //hIST
|
||
|
|
{
|
||
|
|
rep.append("<br>Image histogram");
|
||
|
|
rep.append("<br>Should be 2 bytes for each entry in PLTE");
|
||
|
|
rep.append(("<br>Contains " + (length/2) + " entries"));
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x70485973) //pHYs
|
||
|
|
{
|
||
|
|
rep.append("<br>Physical pixel dimensions");
|
||
|
|
rep.append("<br>Should be 9 bytes");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x73424954) //sBIT
|
||
|
|
{
|
||
|
|
rep.append("<br>Significant bits");
|
||
|
|
rep.append("<br>Should be 4 bytes or less");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x74455874) //tEXt
|
||
|
|
{
|
||
|
|
rep.append("<br>Text");
|
||
|
|
rep.append("<br>Consists of keyword and value separated by null byte");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x74494D45) //tIME
|
||
|
|
{
|
||
|
|
rep.append("<br>Last modification time");
|
||
|
|
rep.append(("<br>Year : "+png_get_word(start+8)));
|
||
|
|
rep.append(("<br>Month : "+uf(start+10)));
|
||
|
|
rep.append(("<br>Day : "+uf(start+11)));
|
||
|
|
rep.append(("<br>Hour : "+uf(start+12)));
|
||
|
|
rep.append(("<br>Minute: "+uf(start+13)));
|
||
|
|
rep.append(("<br>Second: "+uf(start+14)));
|
||
|
|
}
|
||
|
|
else if(typ == 0x74524E53) //tRNS
|
||
|
|
{
|
||
|
|
rep.append("<br>Transparency");
|
||
|
|
rep.append("<br>Alpha values, either for palette");
|
||
|
|
rep.append("<br> or single value for image");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else if(typ == 0x7a545874) //zTXt
|
||
|
|
{
|
||
|
|
rep.append("<br>Text, compressed");
|
||
|
|
rep.append("<br>Keyword is not compressed, value is compressed");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
rep.append("<br>Unknown chunk type");
|
||
|
|
rep.append("<br>dump of data:");
|
||
|
|
fdump(start+8,start+8+length-1);
|
||
|
|
}
|
||
|
|
return check_png_chunks(start+12+length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Analysis particular to a bmp file
|
||
|
|
*/
|
||
|
|
private void analyse_bmp()
|
||
|
|
{
|
||
|
|
int fsz=get_dword(2);
|
||
|
|
int offbits=get_dword(10);
|
||
|
|
if(f.length<54)
|
||
|
|
{
|
||
|
|
rep.append("<br>File is too short to contain headers");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
rep.append("<br>File Header info:");
|
||
|
|
rep.append(("<br>File size: "+Integer.toHexString(fsz)));
|
||
|
|
rep.append(("<br>Reserved1: " + get_hword(6)));
|
||
|
|
rep.append(("<br>Reserved2: " + get_hword(8)));
|
||
|
|
if(f.length>fsz)
|
||
|
|
{
|
||
|
|
rep.append(("<br>Additional bytes at end of file = "+(f.length-fsz)));
|
||
|
|
rep.append(("<br>Dump of additional bytes:"));
|
||
|
|
fdump(fsz,f.length-1);
|
||
|
|
rep.append("<br>NB: Additional bytes may indicate that the height is set incorrectly" +
|
||
|
|
" in the header, try increasing the height to see if it is hiding image data");
|
||
|
|
}
|
||
|
|
rep.append(("<br>Bitmap data starts at: "+Integer.toHexString(offbits)));
|
||
|
|
rep.append(("<br>Info Header:"));
|
||
|
|
int bisize=get_dword(14);
|
||
|
|
rep.append(("<br>Info Size: " + Integer.toHexString(bisize)));
|
||
|
|
rep.append(("<br>Width: " + get_hdword(18) + " (" + get_dword(18) + ")"));
|
||
|
|
rep.append(("<br>Height: " + get_hdword(22) + " (" + get_dword(22) + ")"));
|
||
|
|
rep.append(("<br>Planes: " + get_hword(26) + " (must be 1)"));
|
||
|
|
rep.append(("<br>BitCount: " + get_hword(28)+ " bits per pixel"));
|
||
|
|
int compress = get_dword(30);
|
||
|
|
rep.append(("<br>Compression: " + get_hdword(30)));
|
||
|
|
if(compress==0x00||compress==0x32424752)
|
||
|
|
rep.append(" (No compression)");
|
||
|
|
else if(compress==0x01||compress==0x38454c52)
|
||
|
|
rep.append(" (RLE for 8bpp RGB)");
|
||
|
|
else if(compress==0x02||compress==0x34454c52)
|
||
|
|
rep.append(" (RLE for 4bpp RGB)");
|
||
|
|
else if(compress==0x03)
|
||
|
|
rep.append(" (Raw RGB with packing)");
|
||
|
|
else if(compress==0x32776173)
|
||
|
|
rep.append(" (Raw RGB)");
|
||
|
|
else if(compress==0x41424752)
|
||
|
|
rep.append(" (Raw RGB with alpha)");
|
||
|
|
else if(compress==0x54424752)
|
||
|
|
rep.append(" (Raw RGB with transparency)");
|
||
|
|
rep.append(("<br>Size Image: " + get_hdword(34) + " (can be zero if bitmap is uncompressed)"));
|
||
|
|
rep.append(("<br>XPelsPerMeter: " + get_hdword(38) + " (pixels per meter for target device)"));
|
||
|
|
rep.append(("<br>YPelsPerMeter: " + get_hdword(42) + " (pixels per meter for target device)"));
|
||
|
|
rep.append(("<br>ClrUsed: " + get_hdword(46) + " (color indexes in use, 0=max)"));
|
||
|
|
rep.append(("<br>ClrImportant: " + get_hdword(50) + "(0 if all colors are important)"));
|
||
|
|
int ctstart = 14+bisize;
|
||
|
|
rep.append(("<br>Color table computed start: "+Integer.toHexString(ctstart) + "(normally 0x36, if not then possible hidden data at that point)"));
|
||
|
|
if(ctstart>0x36)
|
||
|
|
{
|
||
|
|
rep.append("<br>Dump of gap between header and start of color table:");
|
||
|
|
fdump(0x36, ctstart-1);
|
||
|
|
}
|
||
|
|
if(get_word(28)<=8)
|
||
|
|
{
|
||
|
|
rep.append("<br>Color Index Table (NB fourth entry of each index should be zero, order is b,g,r,a):");
|
||
|
|
int ncols=get_dword(46);
|
||
|
|
if(ncols==0)
|
||
|
|
{
|
||
|
|
if(get_word(28)==1)ncols=2;
|
||
|
|
else if(get_word(28)==4)ncols=16;
|
||
|
|
else if(get_word(28)==8)ncols=256;
|
||
|
|
}
|
||
|
|
for(int i=0;i<ncols;i++)
|
||
|
|
{
|
||
|
|
rep.append("<br>");
|
||
|
|
for(int j=0;j<4;j++)
|
||
|
|
{
|
||
|
|
rep.append(m2(Integer.toHexString(uf(ctstart + i * 4 + j))));
|
||
|
|
rep.append(" ");
|
||
|
|
}
|
||
|
|
rep.append(" ");
|
||
|
|
for(int j=0;j<4;j++)
|
||
|
|
{
|
||
|
|
char c=(char)uf(ctstart + i * 4 + j);
|
||
|
|
if(c<32||c>0x7f)c='.';
|
||
|
|
rep.append((""+c));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ctstart+=ncols*4;
|
||
|
|
}
|
||
|
|
if(ctstart!=offbits)
|
||
|
|
{
|
||
|
|
rep.append(("<br>Color table finishes at " + Integer.toHexString(ctstart) +
|
||
|
|
" but data bits start at " + Integer.toHexString(offbits)));
|
||
|
|
}
|
||
|
|
if(ctstart<offbits)
|
||
|
|
{
|
||
|
|
rep.append("<br>Dump of gap between color table and image:");
|
||
|
|
fdump(ctstart, offbits-1);
|
||
|
|
}
|
||
|
|
if(compress!=0x00&&compress!=0x32424752)
|
||
|
|
{
|
||
|
|
rep.append("<br>Further checking is only done when there is no compression");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
rep.append("<br>Row filler bytes dump:");
|
||
|
|
// width * bits per pixel
|
||
|
|
int bitsPerRow=get_dword(18)*get_word(28);
|
||
|
|
int bytesPerRow = (bitsPerRow+7)/8;
|
||
|
|
int fgap = (bytesPerRow+3)/4;
|
||
|
|
fgap = fgap * 4 - bytesPerRow;
|
||
|
|
ctstart=offbits;
|
||
|
|
for(int i=0;i<get_dword(22);i++)
|
||
|
|
{
|
||
|
|
ctstart+=bytesPerRow;
|
||
|
|
int ctend=ctstart+fgap;
|
||
|
|
if(ctend!=ctstart)
|
||
|
|
fdump(ctstart,ctend-1);
|
||
|
|
ctstart=ctend;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Dumps a section of file
|
||
|
|
* @param from Dump from this offset
|
||
|
|
* @param to Dump to this offset
|
||
|
|
*/
|
||
|
|
private void fdump(int from, int to)
|
||
|
|
{
|
||
|
|
if(from>=f.length)
|
||
|
|
return;
|
||
|
|
rep.append("<br>Hex:");
|
||
|
|
for(int i=from;i<=to&&i<f.length;i+=16)
|
||
|
|
{
|
||
|
|
rep.append("<br>");
|
||
|
|
for(int j=0;j<16&&i+j<f.length&&i+j<=to;j++)
|
||
|
|
{
|
||
|
|
rep.append(m2(Integer.toHexString(((int)f[i+j])&0xff)));
|
||
|
|
if(j==7)
|
||
|
|
rep.append(' ');
|
||
|
|
}
|
||
|
|
rep.append(" ");
|
||
|
|
}
|
||
|
|
rep.append("<br>Ascii:");
|
||
|
|
for(int i=from;i<=to&&i<f.length;i+=16)
|
||
|
|
{
|
||
|
|
rep.append("<br>");
|
||
|
|
for(int j=0;j<16&&i+j<f.length&&i+j<=to;j++)
|
||
|
|
{
|
||
|
|
char c = (char)f[i+j];
|
||
|
|
if(c=='<') rep.append("<");
|
||
|
|
else if(c=='>') rep.append(">");
|
||
|
|
else if(c=='&') rep.append("&");
|
||
|
|
else if(c >= 32 && c <= 128)
|
||
|
|
rep.append(c);
|
||
|
|
else
|
||
|
|
rep.append('.');
|
||
|
|
if(j==7) rep.append(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Ensures a hex string is 2 bytes long, adding a leading zero if it is not
|
||
|
|
* @param hx hex string
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
private String m2(String hx)
|
||
|
|
{
|
||
|
|
if(hx.length()<2)
|
||
|
|
return "0" + hx;
|
||
|
|
return hx;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns hex of dword at given file offset (lsb...msb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return Hex string
|
||
|
|
*/
|
||
|
|
private String get_hdword(int offs)
|
||
|
|
{
|
||
|
|
return Integer.toHexString(get_dword(offs));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns hex of dword at given file offset (msb...lsb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return Hex string
|
||
|
|
*/
|
||
|
|
private String png_get_hdword(int offs)
|
||
|
|
{
|
||
|
|
return Integer.toHexString(png_get_dword(offs));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns hex of word at given file offset (lsb...msb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return Hex string
|
||
|
|
*/
|
||
|
|
private String get_hword(int offs)
|
||
|
|
{
|
||
|
|
return Integer.toHexString(get_word(offs));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns byte at given file offset
|
||
|
|
* @param offs File offset
|
||
|
|
* @return byte at file offset, as int
|
||
|
|
*/
|
||
|
|
private int uf(int offs)
|
||
|
|
{
|
||
|
|
if(offs>=f.length)
|
||
|
|
return 0;
|
||
|
|
int r = f[offs];
|
||
|
|
return r&0xff;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns dword at given file offset (lsb...msb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return dword at file offset, as int
|
||
|
|
*/
|
||
|
|
private int get_dword(int offs)
|
||
|
|
{
|
||
|
|
if(offs+3>=f.length)
|
||
|
|
return 0;
|
||
|
|
return uf(offs)+(uf(offs+1)<<8)+(uf(offs+2)<<16)+(uf(offs+3)<<24);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns dword at given file offset (msb...lsb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return dword at file offset, as int
|
||
|
|
*/
|
||
|
|
private int png_get_dword(int offs)
|
||
|
|
{
|
||
|
|
if(offs+3>=f.length)
|
||
|
|
return 0;
|
||
|
|
return uf(offs+3)+(uf(offs+2)<<8)+(uf(offs+1)<<16)+(uf(offs)<<24);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns word at given file offset (lsb...msb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return word at file offset, as int
|
||
|
|
*/
|
||
|
|
private int get_word(int offs)
|
||
|
|
{
|
||
|
|
if(offs+1>=f.length)
|
||
|
|
return 0;
|
||
|
|
return uf(offs)+(uf(offs+1)<<8);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns word at given file offset (msb...lsb)
|
||
|
|
* @param offs File offset
|
||
|
|
* @return word at file offset, as int
|
||
|
|
*/
|
||
|
|
private int png_get_word(int offs)
|
||
|
|
{
|
||
|
|
if(offs+1>=f.length)
|
||
|
|
return 0;
|
||
|
|
return uf(offs+1)+(uf(offs)<<8);
|
||
|
|
}
|
||
|
|
|
||
|
|
/** This method is called from within the constructor to
|
||
|
|
* initialize the form.
|
||
|
|
* WARNING: Do NOT modify this code. The content of this method is
|
||
|
|
* always regenerated by the Form Editor.
|
||
|
|
*/
|
||
|
|
@SuppressWarnings("unchecked")
|
||
|
|
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
|
||
|
|
private void initComponents() {
|
||
|
|
|
||
|
|
jPanel1 = new javax.swing.JPanel();
|
||
|
|
jScrollPane1 = new javax.swing.JScrollPane();
|
||
|
|
report = new javax.swing.JEditorPane();
|
||
|
|
jPanel2 = new javax.swing.JPanel();
|
||
|
|
OKButton = new javax.swing.JButton();
|
||
|
|
|
||
|
|
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
|
||
|
|
setTitle("文件格式分析");
|
||
|
|
|
||
|
|
jPanel1.setMinimumSize(new java.awt.Dimension(400, 300));
|
||
|
|
jPanel1.setPreferredSize(new java.awt.Dimension(400, 350));
|
||
|
|
|
||
|
|
jScrollPane1.setMinimumSize(new java.awt.Dimension(400, 260));
|
||
|
|
jScrollPane1.setPreferredSize(new java.awt.Dimension(400, 260));
|
||
|
|
|
||
|
|
report.setContentType("text/html");
|
||
|
|
report.setFont(new java.awt.Font("微软雅黑", 0, 14)); // NOI18N
|
||
|
|
jScrollPane1.setViewportView(report);
|
||
|
|
|
||
|
|
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
|
||
|
|
jPanel1.setLayout(jPanel1Layout);
|
||
|
|
jPanel1Layout.setHorizontalGroup(
|
||
|
|
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
|
||
|
|
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 815, Short.MAX_VALUE)
|
||
|
|
);
|
||
|
|
jPanel1Layout.setVerticalGroup(
|
||
|
|
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
|
||
|
|
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
|
||
|
|
);
|
||
|
|
|
||
|
|
getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);
|
||
|
|
|
||
|
|
jPanel2.setMinimumSize(new java.awt.Dimension(400, 35));
|
||
|
|
jPanel2.setPreferredSize(new java.awt.Dimension(400, 35));
|
||
|
|
|
||
|
|
OKButton.setText("确认");
|
||
|
|
OKButton.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
|
||
|
|
OKButton.addActionListener(new java.awt.event.ActionListener() {
|
||
|
|
public void actionPerformed(java.awt.event.ActionEvent evt) {
|
||
|
|
OKButtonActionPerformed(evt);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
jPanel2.add(OKButton);
|
||
|
|
|
||
|
|
getContentPane().add(jPanel2, java.awt.BorderLayout.SOUTH);
|
||
|
|
|
||
|
|
pack();
|
||
|
|
}// </editor-fold>//GEN-END:initComponents
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Close the form
|
||
|
|
* @param evt Event
|
||
|
|
*/
|
||
|
|
private void OKButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_OKButtonActionPerformed
|
||
|
|
dispose();
|
||
|
|
}//GEN-LAST:event_OKButtonActionPerformed
|
||
|
|
|
||
|
|
|
||
|
|
// Variables declaration - do not modify//GEN-BEGIN:variables
|
||
|
|
private javax.swing.JButton OKButton;
|
||
|
|
private javax.swing.JPanel jPanel1;
|
||
|
|
private javax.swing.JPanel jPanel2;
|
||
|
|
private javax.swing.JScrollPane jScrollPane1;
|
||
|
|
private javax.swing.JEditorPane report;
|
||
|
|
// End of variables declaration//GEN-END:variables
|
||
|
|
|
||
|
|
}
|