Adding upstream version 1:5.44.upstream/1%5.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1215 insertions, 0 deletions

diff --git a/src/compress.c b/src/compress.c
new file mode 100644
index 0000000..282f2a3
--- /dev/null
+++ b/src/compress.c
@@ -0,0 +1,1215 @@
+/*
+ * 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"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: compress.c,v 1.154 2022/12/26 17:35:45 christos Exp $")
+#endif
+
+#include "magic.h"
+#include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SPAWN_H
+#include <spawn.h>
+#endif
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <signal.h>
+#ifndef HAVE_SIG_T
+typedef void (*sig_t)(int);
+#endif /* HAVE_SIG_T */
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#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(ZLIBSUPPORT)
+#define BUILTIN_DECOMPRESS
+#include <zlib.h>
+#endif
+
+#if defined(HAVE_BZLIB_H) && defined(BZLIBSUPPORT)
+#define BUILTIN_BZLIB
+#include <bzlib.h>
+#endif
+
+#if defined(HAVE_LZMA_H) && defined(XZLIBSUPPORT)
+#define BUILTIN_XZLIB
+#include <lzma.h>
+#endif
+
+#if defined(HAVE_ZSTD_H) && defined(ZSTDLIBSUPPORT)
+#define BUILTIN_ZSTDLIB
+#include <zstd.h>
+#include <zstd_errors.h>
+#endif
+
+#if defined(HAVE_LZLIB_H) && defined(LZLIBSUPPORT)
+#define BUILTIN_LZLIB
+#include <lzlib.h>
+#endif
+
+#ifdef DEBUG
+int tty = -1;
+#define DPRINTF(...)	do { \
+	if (tty == -1) \
+		tty = open("/dev/tty", O_RDWR); \
+	if (tty == -1) \
+		abort(); \
+	dprintf(tty, __VA_ARGS__); \
+} while (/*CONSTCOND*/0)
+#else
+#define DPRINTF(...)
+#endif
+
+#ifdef ZLIBSUPPORT
+/*
+ * The following python code is not really used because ZLIBSUPPORT is only
+ * defined if we have a built-in zlib, and the built-in zlib handles that.
+ * That is not true for android where we have zlib.h and not -lz.
+ */
+static const char zlibcode[] =
+    "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))";
+
+static const char *zlib_args[] = { "python", "-c", zlibcode, NULL };
+
+static int
+zlibcmp(const unsigned char *buf)
+{
+	unsigned short x = 1;
+	unsigned char *s = CAST(unsigned char *, CAST(void *, &x));
+
+	if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0)
+		return 0;
+	if (s[0] != 1)	/* endianness test */
+		x = buf[0] | (buf[1] << 8);
+	else
+		x = buf[1] | (buf[0] << 8);
+	if (x % 31)
+		return 0;
+	return 1;
+}
+#endif
+
+static int
+lzmacmp(const unsigned char *buf)
+{
+	if (buf[0] != 0x5d || buf[1] || buf[2])
+		return 0;
+	if (buf[12] && buf[12] != 0xff)
+		return 0;
+	return 1;
+}
+
+#define gzip_flags "-cd"
+#define lrzip_flags "-do"
+#define lzip_flags gzip_flags
+
+static const char *gzip_args[] = {
+	"gzip", gzip_flags, NULL
+};
+static const char *uncompress_args[] = {
+	"uncompress", "-c", NULL
+};
+static const char *bzip2_args[] = {
+	"bzip2", "-cd", NULL
+};
+static const char *lzip_args[] = {
+	"lzip", lzip_flags, NULL
+};
+static const char *xz_args[] = {
+	"xz", "-cd", NULL
+};
+static const char *lrzip_args[] = {
+	"lrzip", lrzip_flags, NULL
+};
+static const char *lz4_args[] = {
+	"lz4", "-cd", NULL
+};
+static const char *zstd_args[] = {
+	"zstd", "-cd", NULL
+};
+
+#define	do_zlib		NULL
+#define	do_bzlib	NULL
+
+file_private const struct {
+	union {
+		const char *magic;
+		int (*func)(const unsigned char *);
+	} u;
+	int maglen;
+	const char **argv;
+	void *unused;
+} compr[] = {
+#define METH_FROZEN	2
+#define METH_BZIP	7
+#define METH_XZ		9
+#define METH_LZIP	8
+#define METH_ZSTD	12
+#define METH_LZMA	13
+#define METH_ZLIB	14
+    { { .magic = "\037\235" },	2, gzip_args, NULL },	/* 0, compressed */
+    /* Uncompress can get stuck; so use gzip first if we have it
+     * Idea from Damien Clark, thanks! */
+    { { .magic = "\037\235" },	2, uncompress_args, NULL },/* 1, compressed */
+    { { .magic = "\037\213" },	2, gzip_args, do_zlib },/* 2, gzipped */
+    { { .magic = "\037\236" },	2, gzip_args, NULL },	/* 3, frozen */
+    { { .magic = "\037\240" },	2, gzip_args, NULL },	/* 4, SCO LZH */
+    /* the standard pack utilities do not accept standard input */
+    { { .magic = "\037\036" },	2, gzip_args, NULL },	/* 5, packed */
+    { { .magic = "PK\3\4" },	4, gzip_args, NULL },	/* 6, pkziped */
+    /* ...only first file examined */
+    { { .magic = "BZh" },	3, bzip2_args, do_bzlib },/* 7, bzip2-ed */
+    { { .magic = "LZIP" },	4, lzip_args, NULL },	/* 8, lzip-ed */
+    { { .magic = "\3757zXZ\0" },6, xz_args, NULL },	/* 9, XZ Util */
+    { { .magic = "LRZI" },	4, lrzip_args, NULL },	/* 10, LRZIP */
+    { { .magic = "\004\"M\030" },4, lz4_args, NULL },	/* 11, LZ4 */
+    { { .magic = "\x28\xB5\x2F\xFD" }, 4, zstd_args, NULL },/* 12, zstd */
+    { { .func = lzmacmp },	-13, xz_args, NULL },	/* 13, lzma */
+#ifdef ZLIBSUPPORT
+    { { .func = zlibcmp },	-2, zlib_args, NULL },	/* 14, zlib */
+#endif
+};
+
+#define OKDATA 	0
+#define NODATA	1
+#define ERRDATA	2
+
+file_private ssize_t swrite(int, const void *, size_t);
+#if HAVE_FORK
+file_private size_t ncompr = __arraycount(compr);
+file_private int uncompressbuf(int, size_t, size_t, int, const unsigned char *,
+    unsigned char **, size_t *);
+#ifdef BUILTIN_DECOMPRESS
+file_private int uncompresszlib(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+file_private int uncompressgzipped(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+#endif
+#ifdef BUILTIN_BZLIB
+file_private int uncompressbzlib(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+#endif
+#ifdef BUILTIN_XZLIB
+file_private int uncompressxzlib(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+#endif
+#ifdef BUILTIN_ZSTDLIB
+file_private int uncompresszstd(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+#endif
+#ifdef BUILTIN_LZLIB
+file_private int uncompresslzlib(const unsigned char *, unsigned char **, size_t,
+    size_t *, int);
+#endif
+
+static int makeerror(unsigned char **, size_t *, const char *, ...)
+    __attribute__((__format__(__printf__, 3, 4)));
+file_private const char *methodname(size_t);
+
+file_private int
+format_decompression_error(struct magic_set *ms, size_t i, unsigned char *buf)
+{
+	unsigned char *p;
+	int mime = ms->flags & MAGIC_MIME;
+
+	if (!mime)
+		return file_printf(ms, "ERROR:[%s: %s]", methodname(i), buf);
+
+	for (p = buf; *p; p++)
+		if (!isalnum(*p))
+			*p = '-';
+
+	return file_printf(ms, "application/x-decompression-error-%s-%s",
+	    methodname(i), buf);
+}
+
+file_protected int
+file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name)
+{
+	unsigned char *newbuf = NULL;
+	size_t i, nsz;
+	char *rbuf;
+	file_pushbuf_t *pb;
+	int urv, prv, rv = 0;
+	int mime = ms->flags & MAGIC_MIME;
+	int fd = b->fd;
+	const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
+	size_t nbytes = b->flen;
+	int sa_saved = 0;
+	struct sigaction sig_act;
+
+	if ((ms->flags & MAGIC_COMPRESS) == 0)
+		return 0;
+
+	for (i = 0; i < ncompr; i++) {
+		int zm;
+		if (nbytes < CAST(size_t, abs(compr[i].maglen)))
+			continue;
+		if (compr[i].maglen < 0) {
+			zm = (*compr[i].u.func)(buf);
+		} else {
+			zm = memcmp(buf, compr[i].u.magic,
+			    CAST(size_t, compr[i].maglen)) == 0;
+		}
+
+		if (!zm)
+			continue;
+
+		/* Prevent SIGPIPE death if child dies unexpectedly */
+		if (!sa_saved) {
+			//We can use sig_act for both new and old, but
+			struct sigaction new_act;
+			memset(&new_act, 0, sizeof(new_act));
+			new_act.sa_handler = SIG_IGN;
+			sa_saved = sigaction(SIGPIPE, &new_act, &sig_act) != -1;
+		}
+
+		nsz = nbytes;
+		free(newbuf);
+		urv = uncompressbuf(fd, ms->bytes_max, i, 
+		    (ms->flags & MAGIC_NO_COMPRESS_FORK), buf, &newbuf, &nsz);
+		DPRINTF("uncompressbuf = %d, %s, %" SIZE_T_FORMAT "u\n", urv,
+		    (char *)newbuf, nsz);
+		switch (urv) {
+		case OKDATA:
+		case ERRDATA:
+			ms->flags &= ~MAGIC_COMPRESS;
+			if (urv == ERRDATA)
+				prv = format_decompression_error(ms, i, newbuf);
+			else
+				prv = file_buffer(ms, -1, NULL, name, newbuf,
+				    nsz);
+			if (prv == -1)
+				goto error;
+			rv = 1;
+			if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0)
+				goto out;
+			if (mime != MAGIC_MIME && mime != 0)
+				goto out;
+			if ((file_printf(ms,
+			    mime ? " compressed-encoding=" : " (")) == -1)
+				goto error;
+			if ((pb = file_push_buffer(ms)) == NULL)
+				goto error;
+			/*
+			 * XXX: If file_buffer fails here, we overwrite
+			 * the compressed text. FIXME.
+			 */
+			if (file_buffer(ms, -1, NULL, NULL, buf, nbytes) == -1)
+			{
+				if (file_pop_buffer(ms, pb) != NULL)
+					abort();
+				goto error;
+			}
+			if ((rbuf = file_pop_buffer(ms, pb)) != NULL) {
+				if (file_printf(ms, "%s", rbuf) == -1) {
+					free(rbuf);
+					goto error;
+				}
+				free(rbuf);
+			}
+			if (!mime && file_printf(ms, ")") == -1)
+				goto error;
+			/*FALLTHROUGH*/
+		case NODATA:
+			break;
+		default:
+			abort();
+			/*NOTREACHED*/
+		error:
+			rv = -1;
+			break;
+		}
+	}
+out:
+	DPRINTF("rv = %d\n", rv);
+
+	if (sa_saved && sig_act.sa_handler != SIG_IGN)
+		(void)sigaction(SIGPIPE, &sig_act, NULL);
+
+	free(newbuf);
+	ms->flags |= MAGIC_COMPRESS;
+	DPRINTF("Zmagic returns %d\n", rv);
+	return rv;
+}
+#endif
+/*
+ * `safe' write for sockets and pipes.
+ */
+file_private ssize_t
+swrite(int fd, const void *buf, size_t n)
+{
+	ssize_t rv;
+	size_t rn = n;
+
+	do
+		switch (rv = write(fd, buf, n)) {
+		case -1:
+			if (errno == EINTR)
+				continue;
+			return -1;
+		default:
+			n -= rv;
+			buf = CAST(const char *, buf) + rv;
+			break;
+		}
+	while (n > 0);
+	return rn;
+}
+
+
+/*
+ * `safe' read for sockets and pipes.
+ */
+file_protected ssize_t
+sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__)))
+{
+	ssize_t rv;
+#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
+		ssize_t cnt;
+		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 && CAST(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 = CAST(char *, CCAST(void *, buf)) + rv;
+			break;
+		}
+	while (n > 0);
+	return rn;
+}
+
+file_protected int
+file_pipe2file(struct magic_set *ms, int fd, const void *startbuf,
+    size_t nbytes)
+{
+	char buf[4096];
+	ssize_t r;
+	int tfd;
+
+#ifdef WIN32
+	const char *t;
+	buf[0] = '\0';
+	if ((t = getenv("TEMP")) != NULL)
+		(void)strlcpy(buf, t, sizeof(buf));
+	else if ((t = getenv("TMP")) != NULL)
+		(void)strlcpy(buf, t, sizeof(buf));
+	else if ((t = getenv("TMPDIR")) != NULL)
+		(void)strlcpy(buf, t, sizeof(buf));
+	if (buf[0] != '\0')
+		(void)strlcat(buf, "/", sizeof(buf));
+	(void)strlcat(buf, "file.XXXXXX", sizeof(buf));
+#else
+	(void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof(buf));
+#endif
+#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
+	{
+		int te;
+		mode_t ou = umask(0);
+		tfd = mkstemp(buf);
+		(void)umask(ou);
+		te = errno;
+		(void)unlink(buf);
+		errno = te;
+	}
+#endif
+	if (tfd == -1) {
+		file_error(ms, errno,
+		    "cannot create temporary file for pipe copy");
+		return -1;
+	}
+
+	if (swrite(tfd, startbuf, nbytes) != CAST(ssize_t, nbytes))
+		r = 1;
+	else {
+		while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
+			if (swrite(tfd, buf, CAST(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, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) {
+		file_badseek(ms);
+		return -1;
+	}
+	return fd;
+}
+#if HAVE_FORK
+#ifdef BUILTIN_DECOMPRESS
+
+#define FHCRC		(1 << 1)
+#define FEXTRA		(1 << 2)
+#define FNAME		(1 << 3)
+#define FCOMMENT	(1 << 4)
+
+
+file_private int
+uncompressgzipped(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int extra __attribute__((__unused__)))
+{
+	unsigned char flg;
+	size_t data_start = 10;
+
+	if (*n < 4) {
+		goto err;	
+	}
+
+	flg = old[3];
+
+	if (flg & FEXTRA) {
+		if (data_start + 1 >= *n)
+			goto err;
+		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)
+		goto err;
+
+	*n -= data_start;
+	old += data_start;
+	return uncompresszlib(old, newch, bytes_max, n, 0);
+err:
+	return makeerror(newch, n, "File too short");
+}
+
+file_private int
+uncompresszlib(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int zlib)
+{
+	int rc;
+	z_stream z;
+
+	z.next_in = CCAST(Bytef *, old);
+	z.avail_in = CAST(uint32_t, *n);
+	z.next_out = *newch;
+	z.avail_out = CAST(unsigned int, bytes_max);
+	z.zalloc = Z_NULL;
+	z.zfree = Z_NULL;
+	z.opaque = Z_NULL;
+
+	/* LINTED bug in header macro */
+	rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15);
+	if (rc != Z_OK)
+		goto err;
+
+	rc = inflate(&z, Z_SYNC_FLUSH);
+	if (rc != Z_OK && rc != Z_STREAM_END) {
+		inflateEnd(&z);
+		goto err;
+	}
+
+	*n = CAST(size_t, z.total_out);
+	rc = inflateEnd(&z);
+	if (rc != Z_OK)
+		goto err;
+
+	/* let's keep the nul-terminate tradition */
+	(*newch)[*n] = '\0';
+
+	return OKDATA;
+err:
+	return makeerror(newch, n, "%s", z.msg ? z.msg : zError(rc));
+}
+#endif
+
+#ifdef BUILTIN_BZLIB
+file_private int
+uncompressbzlib(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int extra __attribute__((__unused__)))
+{
+	int rc;
+	bz_stream bz;
+
+	memset(&bz, 0, sizeof(bz));
+	rc = BZ2_bzDecompressInit(&bz, 0, 0);
+	if (rc != BZ_OK)
+		goto err;
+
+	bz.next_in = CCAST(char *, RCAST(const char *, old));
+	bz.avail_in = CAST(uint32_t, *n);
+	bz.next_out = RCAST(char *, *newch);
+	bz.avail_out = CAST(unsigned int, bytes_max);
+
+	rc = BZ2_bzDecompress(&bz);
+	if (rc != BZ_OK && rc != BZ_STREAM_END) {
+		BZ2_bzDecompressEnd(&bz);
+		goto err;
+	}
+
+	/* Assume byte_max is within 32bit */
+	/* assert(bz.total_out_hi32 == 0); */
+	*n = CAST(size_t, bz.total_out_lo32);
+	rc = BZ2_bzDecompressEnd(&bz);
+	if (rc != BZ_OK)
+		goto err;
+
+	/* let's keep the nul-terminate tradition */
+	(*newch)[*n] = '\0';
+
+	return OKDATA;
+err:
+	return makeerror(newch, n, "bunzip error %d", rc);
+}
+#endif
+
+#ifdef BUILTIN_XZLIB
+file_private int
+uncompressxzlib(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int extra __attribute__((__unused__)))
+{
+	int rc;
+	lzma_stream xz;
+
+	memset(&xz, 0, sizeof(xz));
+	rc = lzma_auto_decoder(&xz, UINT64_MAX, 0);
+	if (rc != LZMA_OK)
+		goto err;
+
+	xz.next_in = CCAST(const uint8_t *, old);
+	xz.avail_in = CAST(uint32_t, *n);
+	xz.next_out = RCAST(uint8_t *, *newch);
+	xz.avail_out = CAST(unsigned int, bytes_max);
+
+	rc = lzma_code(&xz, LZMA_RUN);
+	if (rc != LZMA_OK && rc != LZMA_STREAM_END) {
+		lzma_end(&xz);
+		goto err;
+	}
+
+	*n = CAST(size_t, xz.total_out);
+
+	lzma_end(&xz);
+
+	/* let's keep the nul-terminate tradition */
+	(*newch)[*n] = '\0';
+
+	return OKDATA;
+err:
+	return makeerror(newch, n, "unxz error %d", rc);
+}
+#endif
+
+#ifdef BUILTIN_ZSTDLIB
+file_private int
+uncompresszstd(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int extra __attribute__((__unused__)))
+{
+	size_t rc;
+	ZSTD_DStream *zstd;
+	ZSTD_inBuffer in;
+	ZSTD_outBuffer out;
+
+	if ((zstd = ZSTD_createDStream()) == NULL) {
+		return makeerror(newch, n, "No ZSTD decompression stream, %s",
+		    strerror(errno));
+	}
+
+	rc = ZSTD_DCtx_reset(zstd, ZSTD_reset_session_only);
+	if (ZSTD_isError(rc))
+		goto err;
+
+	in.src = CCAST(const void *, old);
+	in.size = *n;
+	in.pos = 0;
+	out.dst = RCAST(void *, *newch);
+	out.size = bytes_max;
+	out.pos = 0;
+
+	rc = ZSTD_decompressStream(zstd, &out, &in);
+	if (ZSTD_isError(rc))
+		goto err;
+
+	*n = out.pos;
+
+	ZSTD_freeDStream(zstd);
+
+	/* let's keep the nul-terminate tradition */
+	(*newch)[*n] = '\0';
+
+	return OKDATA;
+err:
+	ZSTD_freeDStream(zstd);
+	return makeerror(newch, n, "zstd error %d", ZSTD_getErrorCode(rc));
+}
+#endif
+
+#ifdef BUILTIN_LZLIB
+file_private int
+uncompresslzlib(const unsigned char *old, unsigned char **newch,
+    size_t bytes_max, size_t *n, int extra __attribute__((__unused__)))
+{
+	enum LZ_Errno err;
+	size_t old_remaining = *n;
+	size_t new_remaining = bytes_max;
+	size_t total_read = 0;
+	unsigned char *bufp;
+	struct LZ_Decoder *dec;
+
+	bufp = *newch;
+
+	dec = LZ_decompress_open();
+	if (!dec) {
+		return makeerror(newch, n, "unable to allocate LZ_Decoder");
+	}
+	if (LZ_decompress_errno(dec) != LZ_ok)
+		goto err;
+
+	for (;;) {
+		// LZ_decompress_read() stops at member boundaries, so we may
+		// have more than one successful read after writing all data
+		// we have.
+		if (old_remaining > 0) {
+			int wr = LZ_decompress_write(dec, old, old_remaining);
+			if (wr < 0)
+				goto err;
+			old_remaining -= wr;
+			old += wr;
+		}
+
+		int rd = LZ_decompress_read(dec, bufp, new_remaining);
+		if (rd > 0) {
+			new_remaining -= rd;
+			bufp += rd;
+			total_read += rd;
+		}
+
+		if (rd < 0 || LZ_decompress_errno(dec) != LZ_ok)
+			goto err;
+		if (new_remaining == 0)
+			break;
+		if (old_remaining == 0 && rd == 0)
+			break;
+	}
+
+	LZ_decompress_close(dec);
+	*n = total_read;
+
+	/* let's keep the nul-terminate tradition */
+	*bufp = '\0';
+
+	return OKDATA;
+err:
+	err = LZ_decompress_errno(dec);
+	LZ_decompress_close(dec);
+	return makeerror(newch, n, "lzlib error: %s", LZ_strerror(err));
+}
+#endif
+
+
+static int
+makeerror(unsigned char **buf, size_t *len, const char *fmt, ...)
+{
+	char *msg;
+	va_list ap;
+	int rv;
+
+	free(*buf);
+	va_start(ap, fmt);
+	rv = vasprintf(&msg, fmt, ap);
+	va_end(ap);
+	if (rv < 0) {
+		*buf = NULL;
+		*len = 0;
+		return NODATA;
+	}
+	*buf = RCAST(unsigned char *, msg);
+	*len = strlen(msg);
+	return ERRDATA;
+}
+
+static void
+closefd(int *fd, size_t i)
+{
+	if (fd[i] == -1)
+		return;
+	(void) close(fd[i]);
+	fd[i] = -1;
+}
+
+static void
+closep(int *fd)
+{
+	size_t i;
+	for (i = 0; i < 2; i++)
+		closefd(fd, i);
+}
+
+static void
+movedesc(void *v, int i, int fd)
+{
+	if (fd == i)
+		return; /* "no dup was necessary" */
+#ifdef HAVE_POSIX_SPAWNP
+	posix_spawn_file_actions_t *fa = RCAST(posix_spawn_file_actions_t *, v);
+	posix_spawn_file_actions_adddup2(fa, fd, i);
+	posix_spawn_file_actions_addclose(fa, fd);
+#else
+	if (dup2(fd, i) == -1) {
+		DPRINTF("dup(%d, %d) failed (%s)\n", fd, i, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	close(v ? fd : fd);
+#endif
+}
+
+static void
+closedesc(void *v, int fd)
+{
+#ifdef HAVE_POSIX_SPAWNP
+	posix_spawn_file_actions_t *fa = RCAST(posix_spawn_file_actions_t *, v);
+	posix_spawn_file_actions_addclose(fa, fd);
+#else
+	close(v ? fd : fd);
+#endif
+}
+
+static void
+handledesc(void *v, int fd, int fdp[3][2])
+{
+	if (fd != -1) {
+		(void) lseek(fd, CAST(off_t, 0), SEEK_SET);
+		movedesc(v, STDIN_FILENO, fd);
+	} else {
+		movedesc(v, STDIN_FILENO, fdp[STDIN_FILENO][0]);
+		if (fdp[STDIN_FILENO][1] > 2)
+		    closedesc(v, fdp[STDIN_FILENO][1]);
+	}
+
+	file_clear_closexec(STDIN_FILENO);
+
+///FIXME: if one of the fdp[i][j] is 0 or 1, this can bomb spectacularly
+	movedesc(v, STDOUT_FILENO, fdp[STDOUT_FILENO][1]);
+	if (fdp[STDOUT_FILENO][0] > 2)
+		closedesc(v, fdp[STDOUT_FILENO][0]);
+
+	file_clear_closexec(STDOUT_FILENO);
+
+	movedesc(v, STDERR_FILENO, fdp[STDERR_FILENO][1]);
+	if (fdp[STDERR_FILENO][0] > 2)
+		closedesc(v, fdp[STDERR_FILENO][0]);
+
+	file_clear_closexec(STDERR_FILENO);
+}
+
+static pid_t
+writechild(int fd, const void *old, size_t n)
+{
+	pid_t pid;
+
+	/*
+	 * fork again, to avoid blocking because both
+	 * pipes filled
+	 */
+	pid = fork();
+	if (pid == -1) {
+		DPRINTF("Fork failed (%s)\n", strerror(errno));
+		return -1;
+	}
+	if (pid == 0) {
+		/* child */
+		if (swrite(fd, old, n) != CAST(ssize_t, n)) {
+			DPRINTF("Write failed (%s)\n", strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+		exit(EXIT_SUCCESS);
+	}
+	/* parent */
+	return pid;
+}
+
+static ssize_t
+filter_error(unsigned char *ubuf, ssize_t n)
+{
+	char *p;
+	char *buf;
+
+	ubuf[n] = '\0';
+	buf = RCAST(char *, ubuf);
+	while (isspace(CAST(unsigned char, *buf)))
+		buf++;
+	DPRINTF("Filter error[[[%s]]]\n", buf);
+	if ((p = strchr(CAST(char *, buf), '\n')) != NULL)
+		*p = '\0';
+	if ((p = strchr(CAST(char *, buf), ';')) != NULL)
+		*p = '\0';
+	if ((p = strrchr(CAST(char *, buf), ':')) != NULL) {
+		++p;
+		while (isspace(CAST(unsigned char, *p)))
+			p++;
+		n = strlen(p);
+		memmove(ubuf, p, CAST(size_t, n + 1));
+	}
+	DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf);
+	if (islower(*ubuf))
+		*ubuf = toupper(*ubuf);
+	return n;
+}
+
+file_private const char *
+methodname(size_t method)
+{
+	switch (method) {
+#ifdef BUILTIN_DECOMPRESS
+	case METH_FROZEN:
+	case METH_ZLIB:
+		return "zlib";
+#endif
+#ifdef BUILTIN_BZLIB
+	case METH_BZIP:
+		return "bzlib";
+#endif
+#ifdef BUILTIN_XZLIB
+	case METH_XZ:
+	case METH_LZMA:
+		return "xzlib";
+#endif
+#ifdef BUILTIN_ZSTDLIB
+	case METH_ZSTD:
+		return "zstd";
+#endif
+#ifdef BUILTIN_LZLIB
+	case METH_LZIP:
+		return "lzlib";
+#endif
+	default:
+		return compr[method].argv[0];
+	}
+}
+
+file_private int (*
+getdecompressor(size_t method))(const unsigned char *, unsigned char **, size_t,
+    size_t *, int)
+{
+	switch (method) {
+#ifdef BUILTIN_DECOMPRESS
+	case METH_FROZEN:
+		return uncompressgzipped;
+	case METH_ZLIB:
+		return uncompresszlib;
+#endif
+#ifdef BUILTIN_BZLIB
+	case METH_BZIP:
+		return uncompressbzlib;
+#endif
+#ifdef BUILTIN_XZLIB
+	case METH_XZ:
+	case METH_LZMA:
+		return uncompressxzlib;
+#endif
+#ifdef BUILTIN_ZSTDLIB
+	case METH_ZSTD:
+		return uncompresszstd;
+#endif
+#ifdef BUILTIN_LZLIB
+	case METH_LZIP:
+		return uncompresslzlib;
+#endif
+	default:
+		return NULL;
+	}
+}
+
+file_private int
+uncompressbuf(int fd, size_t bytes_max, size_t method, int nofork,
+    const unsigned char *old, unsigned char **newch, size_t* n)
+{
+	int fdp[3][2];
+	int status, rv, w;
+	pid_t pid;
+	pid_t writepid = -1;
+	size_t i;
+	ssize_t r;
+	char *const *args;
+#ifdef HAVE_POSIX_SPAWNP
+	posix_spawn_file_actions_t fa;
+#endif
+	int (*decompress)(const unsigned char *, unsigned char **,
+	    size_t, size_t *, int) = getdecompressor(method);
+
+	*newch = CAST(unsigned char *, malloc(bytes_max + 1));
+	if (*newch == NULL)
+		return makeerror(newch, n, "No buffer, %s", strerror(errno));
+
+	if (decompress) {
+		if (nofork) {
+			return makeerror(newch, n,
+			    "Fork is required to uncompress, but disabled");
+		}
+		return (*decompress)(old, newch, bytes_max, n, 1);
+	}
+
+	(void)fflush(stdout);
+	(void)fflush(stderr);
+
+	for (i = 0; i < __arraycount(fdp); i++)
+		fdp[i][0] = fdp[i][1] = -1;
+
+	/*
+	 * There are multithreaded users who run magic_file()
+	 * from dozens of threads. If two parallel magic_file() calls
+	 * analyze two large compressed files, both will spawn
+	 * an uncompressing child here, which writes out uncompressed data.
+	 * We read some portion, then close the pipe, then waitpid() the child.
+	 * If uncompressed data is larger, child should get EPIPE and exit.
+	 * However, with *parallel* calls OTHER child may unintentionally
+	 * inherit pipe fds, thus keeping pipe open and making writes in
+	 * our child block instead of failing with EPIPE!
+	 * (For the bug to occur, two threads must mutually inherit their pipes,
+	 * and both must have large outputs. Thus it happens not that often).
+	 * To avoid this, be sure to create pipes with O_CLOEXEC.
+	 */
+	if ((fd == -1 && file_pipe_closexec(fdp[STDIN_FILENO]) == -1) ||
+	    file_pipe_closexec(fdp[STDOUT_FILENO]) == -1 ||
+	    file_pipe_closexec(fdp[STDERR_FILENO]) == -1) {
+		closep(fdp[STDIN_FILENO]);
+		closep(fdp[STDOUT_FILENO]);
+		return makeerror(newch, n, "Cannot create pipe, %s",
+		    strerror(errno));
+	}
+
+	args = RCAST(char *const *, RCAST(intptr_t, compr[method].argv));
+#ifdef HAVE_POSIX_SPAWNP
+	posix_spawn_file_actions_init(&fa);
+
+	handledesc(&fa, fd, fdp);
+
+	status = posix_spawnp(&pid, compr[method].argv[0], &fa, NULL,
+	    args, NULL);
+
+	posix_spawn_file_actions_destroy(&fa);
+
+	if (status == -1) {
+		return makeerror(newch, n, "Cannot posix_spawn `%s', %s",
+		    compr[method].argv[0], strerror(errno));
+	}
+#else
+	/* For processes with large mapped virtual sizes, vfork
+	 * may be _much_ faster (10-100 times) than fork.
+	 */
+	pid = vfork();
+	if (pid == -1) {
+		return makeerror(newch, n, "Cannot vfork, %s",
+		    strerror(errno));
+	}
+	if (pid == 0) {
+		/* child */
+		/* Note: we are after vfork, do not modify memory
+		 * in a way which confuses parent. In particular,
+		 * do not modify fdp[i][j].
+		 */
+		handledesc(NULL, fd, fdp);
+
+		(void)execvp(compr[method].argv[0], args);
+		dprintf(STDERR_FILENO, "exec `%s' failed, %s",
+		    compr[method].argv[0], strerror(errno));
+		_exit(EXIT_FAILURE); /* _exit(), not exit(), because of vfork */
+	}
+#endif
+	/* parent */
+	/* Close write sides of child stdout/err pipes */
+	for (i = 1; i < __arraycount(fdp); i++)
+		closefd(fdp[i], 1);
+	/* Write the buffer data to child stdin, if we don't have fd */
+	if (fd == -1) {
+		closefd(fdp[STDIN_FILENO], 0);
+		writepid = writechild(fdp[STDIN_FILENO][1], old, *n);
+		if (writepid == (pid_t)-1) {
+			rv = makeerror(newch, n, "Write to child failed, %s",
+			    strerror(errno));
+			goto err;
+		}
+		closefd(fdp[STDIN_FILENO], 1);
+	}
+
+	rv = OKDATA;
+	r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0);
+	if (r < 0) {
+		rv = ERRDATA;
+		DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
+		        strerror(errno));
+		goto err;
+	} 
+	if (CAST(size_t, r) == bytes_max) {
+		/*
+		 * close fd so that the child exits with sigpipe and ignore
+		 * errors, otherwise we risk the child blocking and never
+		 * exiting.
+		 */
+		closefd(fdp[STDOUT_FILENO], 0);
+		goto ok;
+	}
+	if ((r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0) {
+		rv = ERRDATA;
+		r = filter_error(*newch, r);
+		goto ok;
+	}
+	if  (r == 0)
+		goto ok;
+	rv = makeerror(newch, n, "Read stderr failed, %s",
+	    strerror(errno));
+	goto err;
+ok:
+	*n = r;
+	/* NUL terminate, as every buffer is handled here. */
+	(*newch)[*n] = '\0';
+err:
+	closefd(fdp[STDIN_FILENO], 1);
+	closefd(fdp[STDOUT_FILENO], 0);
+	closefd(fdp[STDERR_FILENO], 0);
+
+	w = waitpid(pid, &status, 0);
+wait_err:
+	if (w == -1) {
+		rv = makeerror(newch, n, "Wait failed, %s", strerror(errno));
+		DPRINTF("Child wait return %#x\n", status);
+	} else if (!WIFEXITED(status)) {
+		DPRINTF("Child not exited (%#x)\n", status);
+	} else if (WEXITSTATUS(status) != 0) {
+		DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status));
+	}
+	if (writepid > 0) {
+		/* _After_ we know decompressor has exited, our input writer
+		 * definitely will exit now (at worst, writing fails in it,
+		 * since output fd is closed now on the reading size).
+		 */
+		w = waitpid(writepid, &status, 0);
+		writepid = -1;
+		goto wait_err;
+	}
+
+	closefd(fdp[STDIN_FILENO], 0); //why? it is already closed here!
+	DPRINTF("Returning %p n=%" SIZE_T_FORMAT "u rv=%d\n", *newch, *n, rv);
+
+	return rv;
+}
+#endif