1 files changed, 404 insertions, 0 deletions
diff --git a/usr/src/boot/libsa/bzipfs.c b/usr/src/boot/libsa/bzipfs.c
new file mode 100644
index 0000000000..1c2cc39904
--- /dev/null
+++ b/usr/src/boot/libsa/bzipfs.c
@@ -0,0 +1,404 @@
+/*
+ * Copyright (c) 1998 Michael Smith.
+ * Copyright (c) 2000 Maxim Sobolev
+ * All rights reserved.
+ *
+ * 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, 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.
+ */
+
+#include <sys/cdefs.h>
+
+#ifndef REGRESSION
+#include "stand.h"
+#else
+#include <stdlib.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/unistd.h>
+
+struct open_file {
+	int	f_flags;	/* see F_* below */
+	void	*f_fsdata;	/* file system specific data */
+};
+#define	F_READ		0x0001	/* file opened for reading */
+#define	EOFFSET	(ELAST + 8)	/* relative seek not supported */
+#define	panic(x, y) abort()
+
+static inline uint_t
+min(uint_t a, uint_t b)
+{
+	return (a < b ? a : b);
+}
+#endif
+
+#include <sys/stat.h>
+#include <string.h>
+#include <bzlib.h>
+
+#define	BZ_BUFSIZE 2048	/* XXX larger? */
+
+struct bz_file
+{
+	int		bzf_rawfd;
+	bz_stream	bzf_bzstream;
+	char		bzf_buf[BZ_BUFSIZE];
+	int		bzf_endseen;
+};
+
+static int	bzf_fill(struct bz_file *);
+static int	bzf_open(const char *, struct open_file *);
+static int	bzf_close(struct open_file *);
+static int	bzf_read(struct open_file *, void *, size_t, size_t *);
+static off_t	bzf_seek(struct open_file *, off_t, int);
+static int	bzf_stat(struct open_file *, struct stat *);
+
+#ifndef REGRESSION
+struct fs_ops bzipfs_fsops = {
+	.fs_name = "bzip",
+	.fo_open = bzf_open,
+	.fo_close = bzf_close,
+	.fo_read = bzf_read,
+	.fo_write = null_write,
+	.fo_seek = bzf_seek,
+	.fo_stat = bzf_stat,
+	.fo_readdir = null_readdir
+};
+#endif
+
+static int
+bzf_fill(struct bz_file *bzf)
+{
+	int		result;
+	int		req;
+
+	req = BZ_BUFSIZE - bzf->bzf_bzstream.avail_in;
+	result = 0;
+
+	/* If we need more */
+	if (req > 0) {
+		/* move old data to bottom of buffer */
+		if (req < BZ_BUFSIZE) {
+			bcopy(bzf->bzf_buf + req, bzf->bzf_buf,
+			    BZ_BUFSIZE - req);
+		}
+
+		/* read to fill buffer and update availibility data */
+		result = read(bzf->bzf_rawfd,
+		    bzf->bzf_buf + bzf->bzf_bzstream.avail_in, req);
+		bzf->bzf_bzstream.next_in = bzf->bzf_buf;
+		if (result >= 0)
+			bzf->bzf_bzstream.avail_in += result;
+	}
+	return (result);
+}
+
+/*
+ * Adapted from get_byte/check_header in libz
+ *
+ * Returns 0 if the header is OK, nonzero if not.
+ */
+static int
+get_byte(struct bz_file *bzf)
+{
+	if ((bzf->bzf_bzstream.avail_in == 0) && (bzf_fill(bzf) == -1))
+		return (-1);
+	bzf->bzf_bzstream.avail_in--;
+	return (*(bzf->bzf_bzstream.next_in)++);
+}
+
+static int bz_magic[3] = {'B', 'Z', 'h'}; /* bzip2 magic header */
+
+static int
+check_header(struct bz_file *bzf)
+{
+	unsigned int len;
+	int		 c;
+
+	/* Check the bzip2 magic header */
+	for (len = 0; len < 3; len++) {
+		c = get_byte(bzf);
+		if (c != bz_magic[len]) {
+			return (1);
+		}
+	}
+	/* Check that the block size is valid */
+	c = get_byte(bzf);
+	if (c < '1' || c > '9')
+		return (1);
+
+	/* Put back bytes that we've took from the input stream */
+	bzf->bzf_bzstream.next_in -= 4;
+	bzf->bzf_bzstream.avail_in += 4;
+
+	return (0);
+}
+
+static int
+bzf_open(const char *fname, struct open_file *f)
+{
+	static char		*bzfname;
+	int			rawfd;
+	struct bz_file	*bzf;
+	char		*cp;
+	int			error;
+	struct stat		sb;
+
+	/* Have to be in "just read it" mode */
+	if (f->f_flags != F_READ)
+		return (EPERM);
+
+	/* If the name already ends in .gz or .bz2, ignore it */
+	if ((cp = strrchr(fname, '.')) &&
+	    ((strcmp(cp, ".gz") == 0) ||
+	    (strcmp(cp, ".bz2") == 0) ||
+	    (strcmp(cp, ".split") == 0)))
+		return (ENOENT);
+
+	/* Construct new name */
+	bzfname = malloc(strlen(fname) + 5);
+	if (bzfname == NULL)
+		return (ENOMEM);
+	sprintf(bzfname, "%s.bz2", fname);
+
+	/* Try to open the compressed datafile */
+	rawfd = open(bzfname, O_RDONLY);
+	free(bzfname);
+	if (rawfd == -1)
+		return (ENOENT);
+
+	if (fstat(rawfd, &sb) < 0) {
+		printf("bzf_open: stat failed\n");
+		close(rawfd);
+		return (ENOENT);
+	}
+	if (!S_ISREG(sb.st_mode)) {
+		printf("bzf_open: not a file\n");
+		close(rawfd);
+		return (EISDIR);		/* best guess */
+	}
+
+	/* Allocate a bz_file structure, populate it */
+	bzf = malloc(sizeof (struct bz_file));
+	if (bzf == NULL)
+		return (ENOMEM);
+	bzero(bzf, sizeof (struct bz_file));
+	bzf->bzf_rawfd = rawfd;
+
+	/* Verify that the file is bzipped */
+	if (check_header(bzf)) {
+		close(bzf->bzf_rawfd);
+		free(bzf);
+		return (EFTYPE);
+	}
+
+	/* Initialise the inflation engine */
+	error = BZ2_bzDecompressInit(&(bzf->bzf_bzstream), 0, 1);
+	if (error != BZ_OK) {
+		printf("bzf_open: BZ2_bzDecompressInit returned %d\n", error);
+		close(bzf->bzf_rawfd);
+		free(bzf);
+		return (EIO);
+	}
+
+	/* Looks OK, we'll take it */
+	f->f_fsdata = bzf;
+	return (0);
+}
+
+static int
+bzf_close(struct open_file *f)
+{
+	struct bz_file	*bzf = (struct bz_file *)f->f_fsdata;
+
+	BZ2_bzDecompressEnd(&(bzf->bzf_bzstream));
+	close(bzf->bzf_rawfd);
+	free(bzf);
+	return (0);
+}
+
+static int
+bzf_read(struct open_file *f, void *buf, size_t size, size_t *resid)
+{
+	struct bz_file	*bzf = (struct bz_file *)f->f_fsdata;
+	int			error;
+
+	bzf->bzf_bzstream.next_out = buf;	/* where and how much */
+	bzf->bzf_bzstream.avail_out = size;
+
+	while (bzf->bzf_bzstream.avail_out && bzf->bzf_endseen == 0) {
+		if ((bzf->bzf_bzstream.avail_in == 0) &&
+		    (bzf_fill(bzf) == -1)) {
+			printf("bzf_read: fill error\n");
+			return (EIO);
+		}
+		if (bzf->bzf_bzstream.avail_in == 0) {
+			/* oops, unexpected EOF */
+			printf("bzf_read: unexpected EOF\n");
+			if (bzf->bzf_bzstream.avail_out == size)
+				return (EIO);
+			break;
+		}
+
+		/* decompression pass */
+		error = BZ2_bzDecompress(&bzf->bzf_bzstream);
+		if (error == BZ_STREAM_END) {		/* EOF, all done */
+			bzf->bzf_endseen = 1;
+			break;
+		}
+		if (error != BZ_OK) {	/* argh, decompression error */
+			printf("bzf_read: BZ2_bzDecompress returned %d\n",
+			    error);
+			return (EIO);
+		}
+	}
+	if (resid != NULL)
+		*resid = bzf->bzf_bzstream.avail_out;
+	return (0);
+}
+
+static int
+bzf_rewind(struct open_file *f)
+{
+	struct bz_file	*bzf = (struct bz_file *)f->f_fsdata;
+	struct bz_file	*bzf_tmp;
+
+	/*
+	 * Since bzip2 does not have an equivalent inflateReset function a crude
+	 * one needs to be provided. The functions all called in such a way that
+	 * at any time an error occurs a roll back can be done (effectively
+	 * making this rewind 'atomic', either the reset occurs successfully
+	 * or not at all, with no 'undefined' state happening).
+	 */
+
+	/* Allocate a bz_file structure, populate it */
+	bzf_tmp = malloc(sizeof (struct bz_file));
+	if (bzf_tmp == NULL)
+		return (-1);
+	bzero(bzf_tmp, sizeof (struct bz_file));
+	bzf_tmp->bzf_rawfd = bzf->bzf_rawfd;
+
+	/* Initialise the inflation engine */
+	if (BZ2_bzDecompressInit(&(bzf_tmp->bzf_bzstream), 0, 1) != BZ_OK) {
+		free(bzf_tmp);
+		return (-1);
+	}
+
+	/* Seek back to the beginning of the file */
+	if (lseek(bzf->bzf_rawfd, 0, SEEK_SET) == -1) {
+		BZ2_bzDecompressEnd(&(bzf_tmp->bzf_bzstream));
+		free(bzf_tmp);
+		return (-1);
+	}
+
+	/* Free old bz_file data */
+	BZ2_bzDecompressEnd(&(bzf->bzf_bzstream));
+	free(bzf);
+
+	/* Use the new bz_file data */
+	f->f_fsdata = bzf_tmp;
+
+	return (0);
+}
+
+static off_t
+bzf_seek(struct open_file *f, off_t offset, int where)
+{
+	struct bz_file	*bzf = (struct bz_file *)f->f_fsdata;
+	off_t		target;
+	char		discard[16];
+
+	switch (where) {
+	case SEEK_SET:
+		target = offset;
+		break;
+	case SEEK_CUR:
+		target = offset + bzf->bzf_bzstream.total_out_lo32;
+		break;
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+
+	/* Can we get there from here? */
+	if (target < bzf->bzf_bzstream.total_out_lo32 && bzf_rewind(f) != 0) {
+		errno = EOFFSET;
+		return (-1);
+	}
+
+	/* if bzf_rewind was called then bzf has changed */
+	bzf = (struct bz_file *)f->f_fsdata;
+
+	/* skip forwards if required */
+	while (target > bzf->bzf_bzstream.total_out_lo32) {
+		errno = bzf_read(f, discard, min(sizeof (discard),
+		    target - bzf->bzf_bzstream.total_out_lo32), NULL);
+		if (errno)
+			return (-1);
+	}
+	/* This is where we are (be honest if we overshot) */
+	return (bzf->bzf_bzstream.total_out_lo32);
+}
+
+static int
+bzf_stat(struct open_file *f, struct stat *sb)
+{
+	struct bz_file	*bzf = (struct bz_file *)f->f_fsdata;
+	int		result;
+
+	/* stat as normal, but indicate that size is unknown */
+	if ((result = fstat(bzf->bzf_rawfd, sb)) == 0)
+		sb->st_size = -1;
+	return (result);
+}
+
+void
+bz_internal_error(int errorcode)
+{
+	panic("bzipfs: critical error %d in bzip2 library occured",
+	    errorcode);
+}
+
+#ifdef REGRESSION
+/* Small test case, open and decompress test.bz2 */
+int
+main()
+{
+	struct open_file f;
+	char buf[1024];
+	size_t resid;
+	int err;
+
+	memset(&f, '\0', sizeof (f));
+	f.f_flags = F_READ;
+	err = bzf_open("test", &f);
+	if (err != 0)
+		exit(1);
+	do {
+		err = bzf_read(&f, buf, sizeof (buf), &resid);
+	} while (err == 0 && resid != sizeof (buf));
+
+	if (err != 0)
+		exit(2);
+	exit(0);
+}
+#endif