--- a/packages/fs/jffs2/current/src/compr_zlib.c
+++ b/packages/fs/jffs2/current/src/compr_zlib.c
@@ -7,62 +7,23 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: compr_zlib.c,v 1.12 2002/01/25 01:49:26 dwmw2 Exp $
+ * $Id: compr_zlib.c,v 1.22 2003/01/12 13:21:28 dwmw2 Exp $
  *
  */
 
-/* Be careful - there are three environments are supported by this file. 
- * - Linux kernel.
- * - eCos kernel.
- * - Userspace (mkfs.jffs2).
- */
+#if !defined(__KERNEL__) && !defined(__ECOS)
+#error "The userspace support got too messy and was removed. Update your mkfs.jffs2"
+#endif
 
-#ifdef __ECOS
-	/* Compiling in eCos (or RedBoot) */
-#include <cyg/compress/zlib.h>
-#include "jffs2port.h"
-#include "nodelist.h"
-
-#elif defined(__KERNEL__)
-	/* Compiling in Linux kernel */
 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/mtd/compatmac.h> /* for min() */
 #include <linux/slab.h>
-#include <linux/jffs2.h>
+#include <linux/zlib.h>
+#include <linux/zutil.h>
+#include <asm/semaphore.h>
 #include "nodelist.h"
 
-static void *zalloc(void *opaque, unsigned nr, unsigned size)
-{
-	/* How much does it request? Should we use vmalloc? Or be dynamic? */
-	return kmalloc(nr * size, GFP_KERNEL);
-}
-
-static void zfree(void *opaque, void *addr)
-{
-	kfree(addr);
-}
-#ifdef CONFIG_ZLIB /* 2.5 kernels will have a shared zlib, at last. */
-#include <linux/zlib.h>
-#else
-#include "zlib.h"
-#endif
-
-#else
-	/* Compiling in Linux(ish) userspace */
-#define min(x,y) ((x)<(y)?(x):(y))
-#ifndef D1
-#define D1(x)
-#endif
-#define KERN_DEBUG
-#define KERN_NOTICE
-#define KERN_WARNING
-#define printk printf
-#include <stdint.h>
-#include <stdio.h>
-#include <zlib.h>
-#endif
-
 	/* Plan: call deflate() with avail_in == *sourcelen, 
 		avail_out = *dstlen - 12 and flush == Z_FINISH. 
 		If it doesn't manage to finish,	call it again with
@@ -72,98 +33,145 @@ static void zfree(void *opaque, void *ad
 	*/
 #define STREAM_END_SPACE 12
 
+static DECLARE_MUTEX(deflate_sem);
+static DECLARE_MUTEX(inflate_sem);
+static z_stream inf_strm, def_strm;
+
+#ifdef __KERNEL__ /* Linux-only */
+int __init jffs2_zlib_init(void)
+{
+	def_strm.workspace = vmalloc(zlib_deflate_workspacesize());
+	if (!def_strm.workspace) {
+		printk(KERN_WARNING "Failed to allocate %d bytes for deflate workspace\n", zlib_deflate_workspacesize());
+		return -ENOMEM;
+	}
+	D1(printk(KERN_DEBUG "Allocated %d bytes for deflate workspace\n", zlib_deflate_workspacesize()));
+	inf_strm.workspace = vmalloc(zlib_inflate_workspacesize());
+	if (!inf_strm.workspace) {
+		printk(KERN_WARNING "Failed to allocate %d bytes for inflate workspace\n", zlib_inflate_workspacesize());
+		vfree(def_strm.workspace);
+		return -ENOMEM;
+	}
+	D1(printk(KERN_DEBUG "Allocated %d bytes for inflate workspace\n", zlib_inflate_workspacesize()));
+	return 0;
+}
+
+void jffs2_zlib_exit(void)
+{
+	vfree(def_strm.workspace);
+	vfree(inf_strm.workspace);
+}
+#endif /* __KERNEL__ */
+
 int jffs2_zlib_compress(unsigned char *data_in, unsigned char *cpage_out, 
 		   uint32_t *sourcelen, uint32_t *dstlen)
 {
-	z_stream strm;
 	int ret;
 
 	if (*dstlen <= STREAM_END_SPACE)
 		return -1;
 
-#ifdef __KERNEL__ /* Linux needs own alloc/free funcs */
-	strm.zalloc = zalloc;
-	strm.zfree = zfree;
-#else /* eCos and userspace don't */
-	strm.zalloc = (void *)0;
-	strm.zfree = (void *)0;
-#endif
+	down(&deflate_sem);
 
-	if (Z_OK != deflateInit(&strm, 3)) {
+	if (Z_OK != zlib_deflateInit(&def_strm, 3)) {
 		printk(KERN_WARNING "deflateInit failed\n");
+		up(&deflate_sem);
 		return -1;
 	}
-	strm.next_in = data_in;
-	strm.total_in = 0;
+
+	def_strm.next_in = data_in;
+	def_strm.total_in = 0;
 	
-	strm.next_out = cpage_out;
-	strm.total_out = 0;
+	def_strm.next_out = cpage_out;
+	def_strm.total_out = 0;
 
-	while (strm.total_out < *dstlen - STREAM_END_SPACE && strm.total_in < *sourcelen) {
-		strm.avail_out = *dstlen - (strm.total_out + STREAM_END_SPACE);
-		strm.avail_in = min((unsigned)(*sourcelen-strm.total_in), strm.avail_out);
+	while (def_strm.total_out < *dstlen - STREAM_END_SPACE && def_strm.total_in < *sourcelen) {
+		def_strm.avail_out = *dstlen - (def_strm.total_out + STREAM_END_SPACE);
+		def_strm.avail_in = min((unsigned)(*sourcelen-def_strm.total_in), def_strm.avail_out);
 		D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
-			  strm.avail_in, strm.avail_out));
-		ret = deflate(&strm, Z_PARTIAL_FLUSH);
+			  def_strm.avail_in, def_strm.avail_out));
+		ret = zlib_deflate(&def_strm, Z_PARTIAL_FLUSH);
 		D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n", 
-			  strm.avail_in, strm.avail_out, strm.total_in, strm.total_out));
+			  def_strm.avail_in, def_strm.avail_out, def_strm.total_in, def_strm.total_out));
 		if (ret != Z_OK) {
 			D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
-			deflateEnd(&strm);
+			zlib_deflateEnd(&def_strm);
+			up(&deflate_sem);
 			return -1;
 		}
 	}
-	strm.avail_out += STREAM_END_SPACE;
-	strm.avail_in = 0;
-	ret = deflate(&strm, Z_FINISH);
+	def_strm.avail_out += STREAM_END_SPACE;
+	def_strm.avail_in = 0;
+	ret = zlib_deflate(&def_strm, Z_FINISH);
+	zlib_deflateEnd(&def_strm);
+
 	if (ret != Z_STREAM_END) {
 		D1(printk(KERN_DEBUG "final deflate returned %d\n", ret));
-		deflateEnd(&strm);
-		return -1;
+		ret = -1;
+		goto out;
 	}
-	deflateEnd(&strm);
-
-	D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n", strm.total_in, strm.total_out));
 
-	if (strm.total_out >= strm.total_in)
-		return -1;
-
+	if (def_strm.total_out >= def_strm.total_in) {
+		D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld; failing\n",
+			  def_strm.total_in, def_strm.total_out));
+		ret = -1;
+		goto out;
+	}
 
-	*dstlen = strm.total_out;
-	*sourcelen = strm.total_in;
-	return 0;
+	D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n",
+		  def_strm.total_in, def_strm.total_out));
+
+	*dstlen = def_strm.total_out;
+	*sourcelen = def_strm.total_in;
+	ret = 0;
+ out:
+	up(&deflate_sem);
+	return ret;
 }
 
 void jffs2_zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
 		      uint32_t srclen, uint32_t destlen)
 {
-	z_stream strm;
 	int ret;
+	int wbits = MAX_WBITS;
+
+	down(&inflate_sem);
+
+	inf_strm.next_in = data_in;
+	inf_strm.avail_in = srclen;
+	inf_strm.total_in = 0;
+	
+	inf_strm.next_out = cpage_out;
+	inf_strm.avail_out = destlen;
+	inf_strm.total_out = 0;
 
-#ifdef __KERNEL__
-	strm.zalloc = zalloc;
-	strm.zfree = zfree;
-#else
-	strm.zalloc = (void *)0;
-	strm.zfree = (void *)0;
-#endif
+	/* If it's deflate, and it's got no preset dictionary, then
+	   we can tell zlib to skip the adler32 check. */
+	if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
+	    ((data_in[0] & 0x0f) == Z_DEFLATED) &&
+	    !(((data_in[0]<<8) + data_in[1]) % 31)) {
 
-	if (Z_OK != inflateInit(&strm)) {
+		D2(printk(KERN_DEBUG "inflate skipping adler32\n"));
+		wbits = -((data_in[0] >> 4) + 8);
+		inf_strm.next_in += 2;
+		inf_strm.avail_in -= 2;
+	} else {
+		/* Let this remain D1 for now -- it should never happen */
+		D1(printk(KERN_DEBUG "inflate not skipping adler32\n"));
+	}
+
+
+	if (Z_OK != zlib_inflateInit2(&inf_strm, wbits)) {
 		printk(KERN_WARNING "inflateInit failed\n");
+		up(&inflate_sem);
 		return;
 	}
-	strm.next_in = data_in;
-	strm.avail_in = srclen;
-	strm.total_in = 0;
-	
-	strm.next_out = cpage_out;
-	strm.avail_out = destlen;
-	strm.total_out = 0;
 
-	while((ret = inflate(&strm, Z_FINISH)) == Z_OK)
+	while((ret = zlib_inflate(&inf_strm, Z_FINISH)) == Z_OK)
 		;
 	if (ret != Z_STREAM_END) {
 		printk(KERN_NOTICE "inflate returned %d\n", ret);
 	}
-	inflateEnd(&strm);
+	zlib_inflateEnd(&inf_strm);
+	up(&inflate_sem);
 }