From d2e57005add34e6ed878fb9051b3a05e4375f0d1 Mon Sep 17 00:00:00 2001
From: Robert Spalek <robert@ucw.cz>
Date: Tue, 15 Jun 2004 09:17:36 +0000
Subject: [PATCH] - lizard.c split into lizard.c and lizard-safe.c - added LGPL
 header

---
 lib/lizard.c | 52 +++-------------------------------------------------
 lib/lizard.h |  6 ++++--
 2 files changed, 7 insertions(+), 51 deletions(-)

diff --git a/lib/lizard.c b/lib/lizard.c
index ad1a7897..d707db3e 100644
--- a/lib/lizard.c
+++ b/lib/lizard.c
@@ -3,6 +3,9 @@
  *
  *	(c) 2004, Robert Spalek <robert@ucw.cz>
  *
+ *	This software may be freely distributed and used according to the terms
+ *	of the GNU Lesser General Public License.
+ *
  *	The file format is based on LZO1X and 
  *	the compression method is based on zlib.
  */
@@ -11,11 +14,6 @@
 #include "lib/lizard.h"
 
 #include <string.h>
-#include <stdlib.h>
-#include <sys/mman.h>
-#include <sys/user.h>
-#include <fcntl.h>
-#include <signal.h>
 
 typedef u16 hash_ptr_t;
 struct hash_record {
@@ -399,50 +397,6 @@ perform_copy_command:
   return out - out_start;
 }
 
-struct lizard_buffer *
-lizard_alloc(uns max_len)
-{
-  int fd = open("/dev/zero", O_RDWR);
-  if (fd < 0)
-    die("open(/dev/zero): %m");
-  struct lizard_buffer *buf = xmalloc(sizeof(struct lizard_buffer));
-  buf->len = (max_len + 2*PAGE_SIZE - 1) / PAGE_SIZE * PAGE_SIZE;
-  buf->ptr = mmap(NULL, buf->len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-  if (buf->ptr == MAP_FAILED)
-    die("mmap(/dev/zero): %m");
-  return buf;
-}
-
-void
-lizard_free(struct lizard_buffer *buf)
-{
-  munmap(buf->ptr, buf->len);
-  xfree(buf);
-}
-
-static void
-sigsegv_handler(int UNUSED whatsit)
-{
-  die("SIGSEGV caught when decompressing.");
-}
-
-int
-lizard_decompress_safe(byte *in, struct lizard_buffer *buf, uns expected_length)
-  /* Decompresses into buf->ptr and returns the length of the uncompressed
-   * file.  Negative return values signalise errors.  If something goes wrong
-   * and buffer would overflow, SIGSEGV is raised.  */
-{
-  uns lock_offset = (expected_length + PAGE_SIZE - 1) / PAGE_SIZE * PAGE_SIZE;
-  if (lock_offset + PAGE_SIZE > buf->len)
-    return -1;
-  mprotect(buf->ptr, lock_offset, PROT_READ | PROT_WRITE);
-  mprotect(buf->ptr + lock_offset, PAGE_SIZE, PROT_READ);
-  sighandler_t old_handler = signal(SIGSEGV, sigsegv_handler);
-  int len = lizard_decompress(in, buf->ptr);
-  signal(SIGSEGV, old_handler);
-  return len;
-}
-
 /*
 
 Description of the LZO1X format :
diff --git a/lib/lizard.h b/lib/lizard.h
index d0f8ba09..52ddf8b3 100644
--- a/lib/lizard.h
+++ b/lib/lizard.h
@@ -3,8 +3,8 @@
  *
  *	(c) 2004, Robert Spalek <robert@ucw.cz>
  *
- *	The file format is based on LZO1X and 
- *	the compression method is based on zlib.
+ *	This software may be freely distributed and used according to the terms
+ *	of the GNU Lesser General Public License.
  */
 
 #define	LIZARD_NEEDS_CHARS	8
@@ -23,9 +23,11 @@
    * total length is 2(header) + 2(link) + 19(string) = 23.
    */
 
+/* lizard.c */
 int lizard_compress(byte *in, uns in_len, byte *out);
 int lizard_decompress(byte *in, byte *out);
 
+/* lizard-safe.c */
 struct lizard_buffer {
   uns len;
   void *ptr;
-- 
2.39.2