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-rw-r--r--contrib/file/compress.c491
1 files changed, 0 insertions, 491 deletions
diff --git a/contrib/file/compress.c b/contrib/file/compress.c
deleted file mode 100644
index 487b1b7..0000000
--- a/contrib/file/compress.c
+++ /dev/null
@@ -1,491 +0,0 @@
-/*
- * Copyright (c) Ian F. Darwin 1986-1995.
- * Software written by Ian F. Darwin and others;
- * maintained 1995-present by Christos Zoulas and others.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice immediately at the beginning of the file, without modification,
- * this list of conditions, and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-/*
- * 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 "magic.h"
-#include <stdio.h>
-#include <stdlib.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#include <string.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#ifdef HAVE_SYS_WAIT_H
-#include <sys/wait.h>
-#endif
-#if defined(HAVE_SYS_TIME_H)
-#include <sys/time.h>
-#endif
-#if defined(HAVE_ZLIB_H) && defined(HAVE_LIBZ)
-#define BUILTIN_DECOMPRESS
-#include <zlib.h>
-#endif
-
-
-#ifndef lint
-FILE_RCSID("@(#)$File: compress.c,v 1.54 2007/12/02 00:28:10 christos Exp $")
-#endif
-
-private struct {
- const char *magic;
- size_t 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 */
- { "PK\3\4", 4, { "gzip", "-cdq", NULL }, 1 }, /* pkzipped, */
- /* ...only first file examined */
- { "BZh", 3, { "bzip2", "-cd", NULL }, 1 }, /* bzip2-ed */
-};
-
-private size_t ncompr = sizeof(compr) / sizeof(compr[0]);
-
-#define NODATA ((size_t)~0)
-
-
-private ssize_t swrite(int, const void *, size_t);
-private size_t uncompressbuf(struct magic_set *, int, size_t,
- const unsigned char *, unsigned char **, size_t);
-#ifdef BUILTIN_DECOMPRESS
-private size_t uncompressgzipped(struct magic_set *, const unsigned char *,
- unsigned char **, size_t);
-#endif
-
-protected int
-file_zmagic(struct magic_set *ms, int fd, const char *name,
- const unsigned char *buf, size_t nbytes)
-{
- unsigned char *newbuf = NULL;
- size_t i, nsz;
- int rv = 0;
- int mime = ms->flags & MAGIC_MIME;
-
- if ((ms->flags & MAGIC_COMPRESS) == 0)
- return 0;
-
- for (i = 0; i < ncompr; i++) {
- if (nbytes < compr[i].maglen)
- continue;
- if (memcmp(buf, compr[i].magic, compr[i].maglen) == 0 &&
- (nsz = uncompressbuf(ms, fd, i, buf, &newbuf,
- nbytes)) != NODATA) {
- ms->flags &= ~MAGIC_COMPRESS;
- rv = -1;
- if (file_buffer(ms, -1, name, newbuf, nsz) == -1)
- goto error;
-
- if (mime == MAGIC_MIME || mime == 0) {
- if (file_printf(ms, mime ?
- " compressed-encoding=" : " (") == -1)
- goto error;
- }
-
- if ((mime == 0 || mime & MAGIC_MIME_ENCODING) &&
- file_buffer(ms, -1, NULL, buf, nbytes) == -1)
- goto error;
-
- if (!mime && file_printf(ms, ")") == -1)
- goto error;
- rv = 1;
- break;
- }
- }
-error:
- if (newbuf)
- free(newbuf);
- ms->flags |= MAGIC_COMPRESS;
- return rv;
-}
-
-/*
- * `safe' write for sockets and pipes.
- */
-private ssize_t
-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.
- */
-protected ssize_t
-sread(int fd, void *buf, size_t n, int canbepipe)
-{
- int rv, cnt;
-#ifdef FIONREAD
- int t = 0;
-#endif
- size_t rn = n;
-
- if (fd == STDIN_FILENO)
- goto nocheck;
-
-#ifdef FIONREAD
- if ((canbepipe && (ioctl(fd, FIONREAD, &t) == -1)) || (t == 0)) {
-#ifdef FD_ZERO
- for (cnt = 0;; cnt++) {
- fd_set check;
- struct timeval tout = {0, 100 * 1000};
- int selrv;
-
- FD_ZERO(&check);
- FD_SET(fd, &check);
-
- /*
- * Avoid soft deadlock: do not read if there
- * is nothing to read from sockets and pipes.
- */
- selrv = select(fd + 1, &check, NULL, NULL, &tout);
- if (selrv == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- } else if (selrv == 0 && cnt >= 5) {
- return 0;
- } else
- break;
- }
-#endif
- (void)ioctl(fd, FIONREAD, &t);
- }
-
- if (t > 0 && (size_t)t < n) {
- n = t;
- rn = n;
- }
-#endif
-
-nocheck:
- 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;
-}
-
-protected int
-file_pipe2file(struct magic_set *ms, int fd, const 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) {
- file_error(ms, errno,
- "cannot create temporary file for pipe copy");
- return -1;
- }
-
- if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes)
- r = 1;
- else {
- while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
- if (swrite(tfd, buf, (size_t)r) != r)
- break;
- }
-
- switch (r) {
- case -1:
- file_error(ms, errno, "error copying from pipe to temp file");
- return -1;
- case 0:
- break;
- default:
- file_error(ms, errno, "error while writing to temp file");
- return -1;
- }
-
- /*
- * 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) {
- file_error(ms, errno, "could not dup descriptor for temp file");
- return -1;
- }
- (void)close(tfd);
- if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- return fd;
-}
-
-#ifdef BUILTIN_DECOMPRESS
-
-#define FHCRC (1 << 1)
-#define FEXTRA (1 << 2)
-#define FNAME (1 << 3)
-#define FCOMMENT (1 << 4)
-
-private size_t
-uncompressgzipped(struct magic_set *ms, const unsigned char *old,
- unsigned char **newch, size_t n)
-{
- unsigned char flg = old[3];
- size_t data_start = 10;
- z_stream z;
- int rc;
-
- if (flg & FEXTRA) {
- if (data_start+1 >= n)
- return 0;
- data_start += 2 + old[data_start] + old[data_start + 1] * 256;
- }
- if (flg & FNAME) {
- while(data_start < n && old[data_start])
- data_start++;
- data_start++;
- }
- if(flg & FCOMMENT) {
- while(data_start < n && old[data_start])
- data_start++;
- data_start++;
- }
- if(flg & FHCRC)
- data_start += 2;
-
- if (data_start >= n)
- return 0;
- if ((*newch = (unsigned char *)malloc(HOWMANY + 1)) == NULL) {
- return 0;
- }
-
- /* XXX: const castaway, via strchr */
- z.next_in = (Bytef *)strchr((const char *)old + data_start,
- 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) {
- file_error(ms, 0, "zlib: %s", z.msg);
- return 0;
- }
-
- rc = inflate(&z, Z_SYNC_FLUSH);
- if (rc != Z_OK && rc != Z_STREAM_END) {
- file_error(ms, 0, "zlib: %s", z.msg);
- return 0;
- }
-
- n = (size_t)z.total_out;
- (void)inflateEnd(&z);
-
- /* let's keep the nul-terminate tradition */
- (*newch)[n] = '\0';
-
- return n;
-}
-#endif
-
-private size_t
-uncompressbuf(struct magic_set *ms, int fd, size_t method,
- const unsigned char *old, unsigned char **newch, size_t n)
-{
- int fdin[2], fdout[2];
- int r;
-
-#ifdef BUILTIN_DECOMPRESS
- if (method == 2)
- return uncompressgzipped(ms, old, newch, n);
-#endif
- (void)fflush(stdout);
- (void)fflush(stderr);
-
- if ((fd != -1 && pipe(fdin) == -1) || pipe(fdout) == -1) {
- file_error(ms, errno, "cannot create pipe");
- return NODATA;
- }
- switch (fork()) {
- case 0: /* child */
- (void) close(0);
- if (fd != -1) {
- (void) dup(fd);
- (void) lseek(0, (off_t)0, SEEK_SET);
- } else {
- (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]);
-#ifndef DEBUG
- if (compr[method].silent)
- (void)close(2);
-#endif
-
- (void)execvp(compr[method].argv[0],
- (char *const *)(intptr_t)compr[method].argv);
-#ifdef DEBUG
- (void)fprintf(stderr, "exec `%s' failed (%s)\n",
- compr[method].argv[0], strerror(errno));
-#endif
- exit(1);
- /*NOTREACHED*/
- case -1:
- file_error(ms, errno, "could not fork");
- return NODATA;
-
- default: /* parent */
- (void) close(fdout[1]);
- if (fd == -1) {
- (void) close(fdin[0]);
- /*
- * fork again, to avoid blocking because both
- * pipes filled
- */
- switch (fork()) {
- case 0: /* child */
- (void)close(fdout[0]);
- if (swrite(fdin[1], old, n) != (ssize_t)n) {
-#ifdef DEBUG
- (void)fprintf(stderr,
- "Write failed (%s)\n",
- strerror(errno));
-#endif
- exit(1);
- }
- exit(0);
- /*NOTREACHED*/
-
- case -1:
-#ifdef DEBUG
- (void)fprintf(stderr, "Fork failed (%s)\n",
- strerror(errno));
-#endif
- exit(1);
- /*NOTREACHED*/
-
- default: /* parent */
- break;
- }
- (void) close(fdin[1]);
- fdin[1] = -1;
- }
-
- if ((*newch = (unsigned char *) malloc(HOWMANY + 1)) == NULL) {
-#ifdef DEBUG
- (void)fprintf(stderr, "Malloc failed (%s)\n",
- strerror(errno));
-#endif
- n = 0;
- goto err;
- }
- if ((r = sread(fdout[0], *newch, HOWMANY, 0)) <= 0) {
-#ifdef DEBUG
- (void)fprintf(stderr, "Read failed (%s)\n",
- strerror(errno));
-#endif
- free(*newch);
- n = 0;
- newch[0] = '\0';
- goto err;
- } else {
- n = r;
- }
- /* NUL terminate, as every buffer is handled here. */
- (*newch)[n] = '\0';
-err:
- if (fdin[1] != -1)
- (void) close(fdin[1]);
- (void) close(fdout[0]);
-#ifdef WNOHANG
- while (waitpid(-1, NULL, WNOHANG) != -1)
- continue;
-#else
- (void)wait(NULL);
-#endif
- return n;
- }
-}
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