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/* $OpenBSD: compress.c,v 1.6 2003/03/03 22:24:08 ian Exp $ */
/*
* compress routines:
* zmagic() - returns 0 if not recognized, uncompresses and prints
* information if recognized
* uncompress(method, old, n, newch) - uncompress old into new,
* using method, return sizeof new
*/
#include "file.h"
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#ifdef HAVE_LIBZ
#include <zlib.h>
#endif
static struct {
const char *magic;
int maglen;
const char *const argv[3];
int silent;
} compr[] = {
{ "\037\235", 2, { "uncompress", "-c", NULL }, 0 }, /* compressed */
{ "\037\213", 2, { "gzip", "-cdq", NULL }, 1 }, /* gzipped */
{ "\037\236", 2, { "gzip", "-cdq", NULL }, 1 }, /* frozen */
{ "\037\240", 2, { "gzip", "-cdq", NULL }, 1 }, /* SCO LZH */
/* the standard pack utilities do not accept standard input */
{ "\037\036", 2, { "gzip", "-cdq", NULL }, 0 }, /* packed */
};
static int ncompr = sizeof(compr) / sizeof(compr[0]);
static int swrite(int, const void *, size_t);
static int sread(int, void *, size_t);
static int uncompress(int, const unsigned char *, unsigned char **, int);
int
zmagic(buf, nbytes)
unsigned char *buf;
int nbytes;
{
unsigned char *newbuf;
int newsize;
int i;
for (i = 0; i < ncompr; i++) {
if (nbytes < compr[i].maglen)
continue;
if (memcmp(buf, compr[i].magic, compr[i].maglen) == 0)
break;
}
if (i == ncompr)
return 0;
if ((newsize = uncompress(i, buf, &newbuf, nbytes)) != 0) {
tryit(newbuf, newsize, 1);
free(newbuf);
printf(" (");
tryit(buf, nbytes, 0);
printf(")");
}
return 1;
}
/*
* `safe' write for sockets and pipes.
*/
static int
swrite(int fd, const void *buf, size_t n)
{
int rv;
size_t rn = n;
do
switch (rv = write(fd, buf, n)) {
case -1:
if (errno == EINTR)
continue;
return -1;
default:
n -= rv;
buf = ((const char *)buf) + rv;
break;
}
while (n > 0);
return rn;
}
/*
* `safe' read for sockets and pipes.
*/
static int
sread(int fd, void *buf, size_t n)
{
int rv;
size_t rn = n;
do
switch (rv = read(fd, buf, n)) {
case -1:
if (errno == EINTR)
continue;
return -1;
case 0:
return rn - n;
default:
n -= rv;
buf = ((char *)buf) + rv;
break;
}
while (n > 0);
return rn;
}
int
pipe2file(int fd, void *startbuf, size_t nbytes)
{
char buf[4096];
int r, tfd;
(void)strcpy(buf, "/tmp/file.XXXXXX");
#ifndef HAVE_MKSTEMP
{
char *ptr = mktemp(buf);
tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
r = errno;
(void)unlink(ptr);
errno = r;
}
#else
tfd = mkstemp(buf);
r = errno;
(void)unlink(buf);
errno = r;
#endif
if (tfd == -1) {
error("Can't create temporary file for pipe copy (%s)\n",
strerror(errno));
/*NOTREACHED*/
}
if (swrite(tfd, startbuf, nbytes) != nbytes)
r = 1;
else {
while ((r = sread(fd, buf, sizeof(buf))) > 0)
if (swrite(tfd, buf, r) != r)
break;
}
switch (r) {
case -1:
error("Error copying from pipe to temp file (%s)\n",
strerror(errno));
/*NOTREACHED*/
case 0:
break;
default:
error("Error while writing to temp file (%s)\n",
strerror(errno));
/*NOTREACHED*/
}
/*
* We duplicate the file descriptor, because fclose on a
* tmpfile will delete the file, but any open descriptors
* can still access the phantom inode.
*/
if ((fd = dup2(tfd, fd)) == -1) {
error("Couldn't dup destcriptor for temp file(%s)\n",
strerror(errno));
/*NOTREACHED*/
}
(void)close(tfd);
if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
error("Couldn't seek on temp file (%s)\n", strerror(errno));
/*NOTREACHED*/
}
return fd;
}
static int
uncompress(method, old, newch, n)
int method;
const unsigned char *old;
unsigned char **newch;
int n;
{
int fdin[2], fdout[2];
if (pipe(fdin) == -1 || pipe(fdout) == -1) {
err(1, "cannot create pipe");
/*NOTREACHED*/
}
switch (fork()) {
case 0: /* child */
(void) close(0);
(void) dup(fdin[0]);
(void) close(fdin[0]);
(void) close(fdin[1]);
(void) close(1);
(void) dup(fdout[1]);
(void) close(fdout[0]);
(void) close(fdout[1]);
if (compr[method].silent)
(void) close(2);
execvp(compr[method].argv[0], (char *const *)compr[method].argv);
err(1, "could not execute `%s'", compr[method].argv[0]);
/*NOTREACHED*/
case -1:
err(1, "could not fork");
/*NOTREACHED*/
default: /* parent */
(void) close(fdin[0]);
(void) close(fdout[1]);
if (write(fdin[1], old, n) != n) {
err(1, "write failed");
/*NOTREACHED*/
}
(void) close(fdin[1]);
if ((*newch = (unsigned char *) malloc(n)) == NULL) {
err(1, "malloc");
/*NOTREACHED*/
}
if ((n = read(fdout[0], *newch, n)) <= 0) {
free(*newch);
err(1, "read failed");
/*NOTREACHED*/
}
(void) close(fdout[0]);
(void) wait(NULL);
return n;
}
}
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