mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
330 lines
6.6 KiB
C
330 lines
6.6 KiB
C
/*
|
|
* 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
|
|
#ifdef HAVE_LIBZ
|
|
#include <zlib.h>
|
|
#endif
|
|
|
|
#ifndef lint
|
|
FILE_RCSID("@(#)$Id: compress.c,v 1.25 2002/07/03 18:26:37 christos Exp $")
|
|
#endif
|
|
|
|
|
|
static struct {
|
|
const char *magic;
|
|
int maglen;
|
|
const char *const argv[3];
|
|
int silent;
|
|
} compr[] = {
|
|
{ "\037\235", 2, { "gzip", "-cdq", NULL }, 1 }, /* compressed */
|
|
/* Uncompress can get stuck; so use gzip first if we have it
|
|
* Idea from Damien Clark, thanks! */
|
|
{ "\037\235", 2, { "uncompress", "-c", NULL }, 1 }, /* 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 */
|
|
{ "BZh", 3, { "bzip2", "-cd", NULL }, 1 }, /* bzip2-ed */
|
|
};
|
|
|
|
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 uncompressbuf(int, const unsigned char *, unsigned char **, int);
|
|
#ifdef HAVE_LIBZ
|
|
static int uncompressgzipped(const unsigned char *, unsigned char **, int);
|
|
#endif
|
|
|
|
int
|
|
zmagic(const char *fname, 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 &&
|
|
(newsize = uncompressbuf(i, buf, &newbuf, nbytes)) != 0) {
|
|
tryit(fname, newbuf, newsize, 1);
|
|
free(newbuf);
|
|
printf(" (");
|
|
tryit(fname, buf, nbytes, 0);
|
|
printf(")");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (i == ncompr)
|
|
return 0;
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef HAVE_LIBZ
|
|
|
|
#define FHCRC (1 << 1)
|
|
#define FEXTRA (1 << 2)
|
|
#define FNAME (1 << 3)
|
|
#define FCOMMENT (1 << 4)
|
|
|
|
static int
|
|
uncompressgzipped(const unsigned char *old, unsigned char **newch, int n)
|
|
{
|
|
unsigned char flg = old[3];
|
|
int data_start = 10;
|
|
z_stream z;
|
|
int rc;
|
|
|
|
if (flg & FEXTRA)
|
|
data_start += 2 + old[data_start] + old[data_start + 1] * 256;
|
|
if (flg & FNAME) {
|
|
while(old[data_start])
|
|
data_start++;
|
|
data_start++;
|
|
}
|
|
if(flg & FCOMMENT) {
|
|
while(old[data_start])
|
|
data_start++;
|
|
data_start++;
|
|
}
|
|
if(flg & FHCRC)
|
|
data_start += 2;
|
|
|
|
if ((*newch = (unsigned char *)malloc(HOWMANY + 1)) == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
z.next_in = (Bytef *)(old + data_start);
|
|
z.avail_in = n - data_start;
|
|
z.next_out = *newch;
|
|
z.avail_out = HOWMANY;
|
|
z.zalloc = Z_NULL;
|
|
z.zfree = Z_NULL;
|
|
z.opaque = Z_NULL;
|
|
|
|
rc = inflateInit2(&z, -15);
|
|
if (rc != Z_OK) {
|
|
(void) fprintf(stderr,"%s: zlib: %s\n", progname, z.msg);
|
|
return 0;
|
|
}
|
|
|
|
rc = inflate(&z, Z_SYNC_FLUSH);
|
|
if (rc != Z_OK && rc != Z_STREAM_END) {
|
|
fprintf(stderr,"%s: zlib: %s\n", progname, z.msg);
|
|
return 0;
|
|
}
|
|
|
|
n = z.total_out;
|
|
inflateEnd(&z);
|
|
|
|
/* let's keep the nul-terminate tradition */
|
|
(*newch)[n++] = '\0';
|
|
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
uncompressbuf(int method, const unsigned char *old, unsigned char **newch,
|
|
int n)
|
|
{
|
|
int fdin[2], fdout[2];
|
|
|
|
/* The buffer is NUL terminated, and we don't need that. */
|
|
n--;
|
|
|
|
#ifdef HAVE_LIBZ
|
|
if (method == 2)
|
|
return uncompressgzipped(old,newch,n);
|
|
#endif
|
|
|
|
if (pipe(fdin) == -1 || pipe(fdout) == -1) {
|
|
error("cannot create pipe (%s).\n", strerror(errno));
|
|
/*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);
|
|
exit(1);
|
|
/*NOTREACHED*/
|
|
case -1:
|
|
error("could not fork (%s).\n", strerror(errno));
|
|
/*NOTREACHED*/
|
|
|
|
default: /* parent */
|
|
(void) close(fdin[0]);
|
|
(void) close(fdout[1]);
|
|
if (swrite(fdin[1], old, n) != n) {
|
|
n = 0;
|
|
goto err;
|
|
}
|
|
(void) close(fdin[1]);
|
|
fdin[1] = -1;
|
|
if ((*newch = (unsigned char *) malloc(HOWMANY + 1)) == NULL) {
|
|
n = 0;
|
|
goto err;
|
|
}
|
|
if ((n = sread(fdout[0], *newch, HOWMANY)) <= 0) {
|
|
free(*newch);
|
|
n = 0;
|
|
goto err;
|
|
}
|
|
/* NUL terminate, as every buffer is handled here. */
|
|
(*newch)[n++] = '\0';
|
|
err:
|
|
if (fdin[1] != -1)
|
|
(void) close(fdin[1]);
|
|
(void) close(fdout[0]);
|
|
(void) wait(NULL);
|
|
return n;
|
|
}
|
|
}
|