#!/bin/bash# /usr/local/bin/javawrapper - the wrapper for binfmt_misc/javaif[-z"$1"];thenexec1>&2echoUsage:$0class-fileexit1fiCLASS=$1FQCLASS=`/usr/local/bin/javaclassname$1`FQCLASSN=`echo$FQCLASS|sed-e's/^.*\.\([^.]*\)$/\1/'`FQCLASSP=`echo$FQCLASS|sed-e's-\.-/-g'-e's-^[^/]*$--'-e's-/[^/]*$--'`# for example:# CLASS=Test.class# FQCLASS=foo.bar.Test# FQCLASSN=Test# FQCLASSP=foo/barunsetCLASSBASEdeclare-iLINKLEVEL=0while:;doif["`basename$CLASS .class`"=="$FQCLASSN"];then# See if this directory works straight offcd-L`dirname$CLASS`CLASSDIR=$PWDcd$OLDPWDifecho$CLASSDIR|grep-q"$FQCLASSP$";thenCLASSBASE=`echo$CLASSDIR|sed-e"s.$FQCLASSP$.."`break;fi# Try dereferencing the directory namecd-P`dirname$CLASS`CLASSDIR=$PWDcd$OLDPWDifecho$CLASSDIR|grep-q"$FQCLASSP$";thenCLASSBASE=`echo$CLASSDIR|sed-e"s.$FQCLASSP$.."`break;fi# If no other possible filename existsif[!-L$CLASS];thenexec1>&2echo$0:echo"$CLASS should be in a"\"directory tree called$FQCLASSP"exit1fifiif[!-L$CLASS];thenbreak;fi# Go down one more level of symbolic linksletLINKLEVEL+=1if[$LINKLEVEL-gt5];thenexec1>&2echo$0:echo"  Too many symbolic links encountered"exit1fiCLASS=`ls--color=no-l$CLASS|sed-e's/^.* \([^ ]*\)$/\1/'`doneif[-z"$CLASSBASE"];thenif[-z"$FQCLASSP"];thenGOODNAME=$FQCLASSN.classelseGOODNAME=$FQCLASSP/$FQCLASSN.classfiexec1>&2echo$0:echo"$FQCLASS should be in a file called$GOODNAME"exit1fiif!echo$CLASSPATH|grep-q"^\(.*:\)*$CLASSBASE\(:.*\)*";then# class is not in CLASSPATH, so prepend dir of class to CLASSPATHif[-z"${CLASSPATH}"];thenexportCLASSPATH=$CLASSBASEelseexportCLASSPATH=$CLASSBASE:$CLASSPATHfifishift/usr/bin/java$FQCLASS"$@"

/* javaclassname.c * * Extracts the class name from a Java class file; intended for use in a Java * wrapper of the type supported by the binfmt_misc option in the Linux kernel. * * Copyright (C) 1999 Colin J. Watson <cjw44@cam.ac.uk>. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU 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 General Public License for more details. * * You should have received a copy of the GNU 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 */#include<stdlib.h>#include<stdio.h>#include<stdarg.h>#include<sys/types.h>/* From Sun's Java VM Specification, as tag entries in the constant pool. */#define CP_UTF8 1#define CP_INTEGER 3#define CP_FLOAT 4#define CP_LONG 5#define CP_DOUBLE 6#define CP_CLASS 7#define CP_STRING 8#define CP_FIELDREF 9#define CP_METHODREF 10#define CP_INTERFACEMETHODREF 11#define CP_NAMEANDTYPE 12#define CP_METHODHANDLE 15#define CP_METHODTYPE 16#define CP_INVOKEDYNAMIC 18/* Define some commonly used error messages */#define seek_error() error("%s: Cannot seek\n", program)#define corrupt_error() error("%s: Class file corrupt\n", program)#define eof_error() error("%s: Unexpected end of file\n", program)#define utf8_error() error("%s: Only ASCII 1-255 supported\n", program);char*program;long*pool;u_int8_tread_8(FILE*classfile);u_int16_tread_16(FILE*classfile);voidskip_constant(FILE*classfile,u_int16_t*cur);voiderror(constchar*format,...);intmain(intargc,char**argv);/* Reads in an unsigned 8-bit integer. */u_int8_tread_8(FILE*classfile){intb=fgetc(classfile);if(b==EOF)eof_error();return(u_int8_t)b;}/* Reads in an unsigned 16-bit integer. */u_int16_tread_16(FILE*classfile){intb1,b2;b1=fgetc(classfile);if(b1==EOF)eof_error();b2=fgetc(classfile);if(b2==EOF)eof_error();return(u_int16_t)((b1<<8)|b2);}/* Reads in a value from the constant pool. */voidskip_constant(FILE*classfile,u_int16_t*cur){u_int16_tlen;intseekerr=1;pool[*cur]=ftell(classfile);switch(read_8(classfile)){caseCP_UTF8:len=read_16(classfile);seekerr=fseek(classfile,len,SEEK_CUR);break;caseCP_CLASS:caseCP_STRING:caseCP_METHODTYPE:seekerr=fseek(classfile,2,SEEK_CUR);break;caseCP_METHODHANDLE:seekerr=fseek(classfile,3,SEEK_CUR);break;caseCP_INTEGER:caseCP_FLOAT:caseCP_FIELDREF:caseCP_METHODREF:caseCP_INTERFACEMETHODREF:caseCP_NAMEANDTYPE:caseCP_INVOKEDYNAMIC:seekerr=fseek(classfile,4,SEEK_CUR);break;caseCP_LONG:caseCP_DOUBLE:seekerr=fseek(classfile,8,SEEK_CUR);++(*cur);break;default:corrupt_error();}if(seekerr)seek_error();}voiderror(constchar*format,...){va_listap;va_start(ap,format);vfprintf(stderr,format,ap);va_end(ap);exit(1);}intmain(intargc,char**argv){FILE*classfile;u_int16_tcp_count,i,this_class,classinfo_ptr;u_int8_tlength;program=argv[0];if(!argv[1])error("%s: Missing input file\n",program);classfile=fopen(argv[1],"rb");if(!classfile)error("%s: Error opening %s\n",program,argv[1]);if(fseek(classfile,8,SEEK_SET))/* skip magic and version numbers */seek_error();cp_count=read_16(classfile);pool=calloc(cp_count,sizeof(long));if(!pool)error("%s: Out of memory for constant pool\n",program);for(i=1;i<cp_count;++i)skip_constant(classfile,&i);if(fseek(classfile,2,SEEK_CUR))/* skip access flags */seek_error();this_class=read_16(classfile);if(this_class<1||this_class>=cp_count)corrupt_error();if(!pool[this_class]||pool[this_class]==-1)corrupt_error();if(fseek(classfile,pool[this_class]+1,SEEK_SET))seek_error();classinfo_ptr=read_16(classfile);if(classinfo_ptr<1||classinfo_ptr>=cp_count)corrupt_error();if(!pool[classinfo_ptr]||pool[classinfo_ptr]==-1)corrupt_error();if(fseek(classfile,pool[classinfo_ptr]+1,SEEK_SET))seek_error();length=read_16(classfile);for(i=0;i<length;++i){u_int8_tx=read_8(classfile);if((x&0x80)||!x){if((x&0xE0)==0xC0){u_int8_ty=read_8(classfile);if((y&0xC0)==0x80){intc=((x&0x1f)<<6)+(y&0x3f);if(c)putchar(c);elseutf8_error();}elseutf8_error();}elseutf8_error();}elseif(x=='/')putchar('.');elseputchar(x);}putchar('\n');free(pool);fclose(classfile);return0;}

#!/bin/bash# /usr/local/java/bin/jarwrapper - the wrapper for binfmt_misc/jarjava -jar $1

classHelloWorld{publicstaticvoidmain(Stringargs[]){System.out.println("Hello World!");}}

javac HelloWorld.java

chmod 755 HelloWorld.class

./HelloWorld.class

./Application.jar

./Applet.html