Stringspublic class Strings extends Object | Strings -- extract printable strings from binary file |
| Fields Summary |
|---|
| protected int | minLength |
| Methods Summary |
|---|
| protected boolean | isStringChar(char ch)Return true if the character is printable IN ASCII.
Not using Character.isLetterOrDigit(); applies to all unicode ranges
if (ch >= 'a" && ch <= 'z")
return true;
if (ch >= 'A" && ch <= 'Z")
return true;
if (ch >= '0" && ch <= '9")
return true;
switch(ch) {
case '/": case '-": case ':":
case '.": case ',": case '_":
case '$": case '%": case '\'":
case '(": case ')": case '[": case ']": case '<": case '>":
return true;
}
return false;
| | public static void | main(java.lang.String[] av)This simple main program looks after filenames and
opening files and such like for you.
Strings o = new Strings();
if (av.length == 0) {
o.process("standard input", System.in);
} else {
for (int i=0; i<av.length; i++)
try {
o.process(av[i],
new FileInputStream(av[i]));
} catch (FileNotFoundException e) {
System.err.println(e);
}
}
| | protected void | process(java.lang.String fileName, java.io.InputStream inStream)Process one file
try {
int i;
char ch;
// This line alone cuts the runtime by about 66% on large files.
BufferedInputStream is = new BufferedInputStream(inStream);
StringBuffer sb = new StringBuffer();
// Read a byte, cast it to char, check if part of printable string.
while ((i = is.read()) != -1) {
ch = (char)i;
if (isStringChar(ch) || (sb.length()>0 && ch==' "))
// If so, build up string.
sb.append(ch);
else {
// if not, see if anything to output.
if (sb.length() == 0)
continue;
if (sb.length() >= minLength) {
report(fileName, sb);
}
sb.setLength(0);
}
}
is.close();
} catch (IOException e) {
System.out.println("IOException: " + e);
}
| | protected void | report(java.lang.String fName, java.lang.StringBuffer theString)Output a match. Made a separate method for use by subclassers.
System.out.println(fName + ": " + theString);
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