94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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* Copyright (c) 1995 Matthias Pfaller.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Matthias Pfaller.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: cloak.c,v 1.2 1995/09/26 21:25:03 phil Exp $
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <a.out.h>
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#include <sys/param.h>
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#define SYM_DATA "_input_data"
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#define SYM_LEN "_input_len"
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void
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writex(int fd, void *buf, int cnt, char *prog)
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{
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if (write(fd, buf, cnt) != cnt) {
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perror(prog);
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exit(1);
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}
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}
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main(int argc, char **argv)
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{
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int n, data_len = 0;
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static struct exec exec;
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static struct nlist nlist[2];
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static char buf[10240];
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if (argc != 1) {
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fprintf(stderr, "usage: %s <file1 >file2", argv[0]);
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exit(1);
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}
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writex(1, &exec, sizeof(exec), argv[0]);
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while ((n = read(0, buf, sizeof(buf))) > 0) {
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data_len += n;
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writex(1, buf, n, argv[0]);
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}
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memset(buf, 0, sizeof(buf));
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if (ALIGN(data_len) - data_len)
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writex(1, buf, ALIGN(data_len) - data_len, argv[0]);
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writex(1, (void *)&data_len, sizeof(data_len), argv[0]);
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n = sizeof(SYM_DATA) + sizeof(SYM_LEN) + sizeof(n);
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nlist[0].n_un.n_strx = sizeof(n);
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nlist[0].n_type = N_TEXT | N_EXT;
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nlist[0].n_value = 0;
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nlist[1].n_un.n_strx = nlist[0].n_un.n_strx + sizeof(SYM_DATA);
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nlist[1].n_type = N_TEXT | N_EXT;
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nlist[1].n_value = ALIGN(data_len);
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writex(1, nlist, sizeof(nlist), argv[0]);
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writex(1, &n, sizeof(n), argv[0]);
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writex(1, SYM_DATA, sizeof(SYM_DATA), argv[0]);
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writex(1, SYM_LEN, sizeof(SYM_LEN), argv[0]);
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N_SETMAGIC(exec, OMAGIC, MID_MACHINE, 0);
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exec.a_text = ALIGN(data_len) + sizeof(data_len);
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exec.a_data = 0;
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exec.a_bss = 0;
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exec.a_syms = sizeof(nlist);
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exec.a_trsize = 0;
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exec.a_drsize = 0;
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lseek(1, (off_t)0, SEEK_SET);
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writex(1, &exec, sizeof(exec), argv[0]);
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exit(0);
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}
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