/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
- * Copyright (C) 2001-2003 Red Hat, Inc.
+ * Copyright © 2001-2007 Red Hat, Inc.
*
* Created by Arjan van de Ven <arjanv@redhat.com>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: compr_rtime.c,v 1.14 2004/06/23 16:34:40 havasi Exp $
*
*
* Very simple lz77-ish encoder.
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/jffs2.h>
+#include <linux/string.h>
+#include <linux/jffs2.h>
#include "compr.h"
/* _compress returns the compressed size, -1 if bigger */
int outpos = 0;
int pos=0;
- memset(positions,0,sizeof(positions));
-
+ memset(positions,0,sizeof(positions));
+
while (pos < (*sourcelen) && outpos <= (*dstlen)-2) {
int backpos, runlen=0;
unsigned char value;
-
+
value = data_in[pos];
cpage_out[outpos++] = data_in[pos++];
-
+
backpos = positions[value];
positions[value]=pos;
-
+
while ((backpos < pos) && (pos < (*sourcelen)) &&
(data_in[pos]==data_in[backpos++]) && (runlen<255)) {
pos++;
/* We failed */
return -1;
}
-
+
/* Tell the caller how much we managed to compress, and how much space it took */
*sourcelen = pos;
*dstlen = outpos;
return 0;
-}
+}
static int jffs2_rtime_decompress(unsigned char *data_in,
short positions[256];
int outpos = 0;
int pos=0;
-
- memset(positions,0,sizeof(positions));
-
+
+ memset(positions,0,sizeof(positions));
+
while (outpos<destlen) {
unsigned char value;
int backoffs;
int repeat;
-
+
value = data_in[pos++];
cpage_out[outpos++] = value; /* first the verbatim copied byte */
repeat = data_in[pos++];
backoffs = positions[value];
-
+
positions[value]=outpos;
if (repeat) {
if (backoffs + repeat >= outpos) {
}
} else {
memcpy(&cpage_out[outpos],&cpage_out[backoffs],repeat);
- outpos+=repeat;
+ outpos+=repeat;
}
}
}
- return 0;
-}
+ return 0;
+}
static struct jffs2_compressor jffs2_rtime_comp = {
.priority = JFFS2_RTIME_PRIORITY,