kgzip is a kzip(8) replacement able to compress and link bootable

32-bit binaries in both ELF and a.out format.

Development sponsored by Global Technology Associates, Inc.

Reviewed/tested by: abial

1 files changed, 215 insertions, 0 deletions

diff --git a/usr.sbin/kgzip/kgzcmp.c b/usr.sbin/kgzip/kgzcmp.c
new file mode 100644
index 0000000..a684b3e
--- /dev/null
+++ b/usr.sbin/kgzip/kgzcmp.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (c) 1999 Global Technology Associates, Inc.
+ * 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.
+ *
+ *	$Id:$
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <a.out.h>
+#include <elf.h>
+
+#include "elfhdr.h"
+#include "kgzip.h"
+
+#define KGZOFF (sizeof(struct kgz_elfhdr) + sizeof(struct kgz_hdr))
+
+#define F_AOUT	1		/* Input format: a.out */
+#define F_ELF	2		/* Input format: ELF32 */
+
+static void mk_data(const struct iodesc *i, const struct iodesc *,
+		    struct kgz_hdr *);
+static int ld_elf(const struct iodesc *, const struct iodesc *,
+		  struct kgz_hdr *, const Elf32_Ehdr *);
+static int ld_aout(const struct iodesc *, const struct iodesc *,
+		   struct kgz_hdr *, const struct exec *);
+
+/*
+ * Compress executable and output it in relocatable object format.
+ */
+void
+kgzcmp(struct kgz_hdr *kh, const char *f1, const char *f2)
+{
+    struct iodesc idi, ido;
+    struct kgz_elfhdr ehdr;
+
+    if ((idi.fd = open(idi.fname = f1, O_RDONLY)) == -1)
+	err(1, "%s", idi.fname);
+    if ((ido.fd = open(ido.fname = f2, O_CREAT | O_TRUNC | O_WRONLY,
+		       0666)) == -1)
+	err(1, "%s", ido.fname);
+    kh->ident[0] = KGZ_ID0;
+    kh->ident[1] = KGZ_ID1;
+    kh->ident[2] = KGZ_ID2;
+    kh->ident[3] = KGZ_ID3;
+    xseek(&ido, KGZOFF);
+    mk_data(&idi, &ido, kh);
+    kh->dload &= 0xffffff;
+    kh->entry &= 0xffffff;
+    xseek(&ido, 0);
+    ehdr = elfhdr;
+    ehdr.st[KGZ_ST_KGZ_NDATA].st_size = kh->nsize;
+    ehdr.sh[KGZ_SH_DATA].sh_size += kh->nsize;
+    xwrite(&ido, &ehdr, sizeof(ehdr));
+    xwrite(&ido, kh, sizeof(*kh));
+    xclose(&ido);
+    xclose(&idi);
+}
+
+/*
+ * Make encoded (compressed) data.
+ */
+static void
+mk_data(const struct iodesc * idi, const struct iodesc * ido,
+	struct kgz_hdr * kh)
+{
+    union {
+	struct exec ex;
+	Elf32_Ehdr ee;
+    } hdr;
+    struct stat sb;
+    struct iodesc idp;
+    int fd[2];
+    pid_t pid;
+    size_t n;
+    int fmt, status, e;
+
+    n = xread(idi, &hdr, sizeof(hdr), 0);
+    fmt = 0;
+    if (n >= sizeof(hdr.ee) && IS_ELF(hdr.ee))
+	fmt = F_ELF;
+    else if (n >= sizeof(hdr.ex) && N_GETMAGIC(hdr.ex) == ZMAGIC)
+	fmt = F_AOUT;
+    if (!fmt)
+	errx(1, "%s: Format not supported", idi->fname);
+    if (pipe(fd))
+	err(1, NULL);
+    switch (pid = fork()) {
+    case -1:
+	err(1, NULL);
+    case 0:
+	close(fd[1]);
+	dup2(fd[0], STDIN_FILENO);
+	close(fd[0]);
+	close(idi->fd);
+	dup2(ido->fd, STDOUT_FILENO);
+	close(ido->fd);
+	execlp("gzip", "gzip", "-9", NULL);
+	warn(NULL);
+	_exit(1);
+    default:
+	close(fd[0]);
+	idp.fname = "(pipe)";
+	idp.fd = fd[1];
+	e = fmt == F_ELF  ? ld_elf(idi, &idp, kh, &hdr.ee) :
+	    fmt == F_AOUT ? ld_aout(idi, &idp, kh, &hdr.ex) : -1;
+	close(fd[1]);
+	if ((pid = waitpid(pid, &status, 0)) == -1)
+	    err(1, NULL);
+	if (WIFSIGNALED(status) || WEXITSTATUS(status))
+	    exit(1);
+    }
+    if (e)
+	errx(1, "%s: Invalid format", idi->fname);
+    if (fstat(ido->fd, &sb))
+	err(1, ido->fname);
+    kh->nsize = sb.st_size - KGZOFF;
+}
+
+/*
+ * "Load" an ELF-format executable.
+ */
+static int
+ld_elf(const struct iodesc * idi, const struct iodesc * ido,
+       struct kgz_hdr * kh, const Elf32_Ehdr * e)
+{
+    Elf32_Phdr p;
+    size_t load, addr, n;
+    unsigned x, i;
+
+    load = addr = n = 0;
+    for (x = i = 0; i < e->e_phnum; i++) {
+	if (xread(idi, &p, sizeof(p),
+		  e->e_phoff + i * e->e_phentsize) != e->e_phentsize)
+	    return -1;
+	if (p.p_type != PT_LOAD)
+	    continue;
+	if (!x)
+	    load = addr = p.p_vaddr;
+	else {
+	    if (p.p_vaddr < addr)
+		return -1;
+	    n = p.p_vaddr - addr;
+	    if (n) {
+		xzero(ido, n);
+		addr += n;
+	    }
+	}
+	if (p.p_memsz < p.p_filesz)
+	    return -1;
+	n = p.p_memsz - p.p_filesz;
+	xcopy(idi, ido, p.p_filesz, p.p_offset);
+	addr += p.p_filesz;
+	x++;
+    }
+    if (!x)
+	return -1;
+    kh->dload = load;
+    kh->dsize = addr - load;
+    kh->isize = kh->dsize + n;
+    kh->entry = e->e_entry;
+    return 0;
+}
+
+/*
+ * "Load" an a.out-format executable.
+ */
+static int
+ld_aout(const struct iodesc * idi, const struct iodesc * ido,
+	struct kgz_hdr * kh, const struct exec * a)
+{
+    size_t load, addr;
+
+    load = addr = N_TXTADDR(*a);
+    xcopy(idi, ido, a->a_text, N_TXTOFF(*a));
+    addr += a->a_text;
+    if (N_DATADDR(*a) != addr)
+	return -1;
+    xcopy(idi, ido, a->a_data, N_DATOFF(*a));
+    addr += a->a_data;
+    kh->dload = load;
+    kh->dsize = addr - load;
+    kh->isize = kh->dsize + a->a_bss;
+    kh->entry = a->a_entry;
+    return 0;
+}