diff options
Diffstat (limited to 'fs/jffs2/compr_rtime.c')
| -rw-r--r-- | fs/jffs2/compr_rtime.c | 48 |
1 files changed, 23 insertions, 25 deletions
diff --git a/fs/jffs2/compr_rtime.c b/fs/jffs2/compr_rtime.c index 39312941866..406d9cc84ba 100644 --- a/fs/jffs2/compr_rtime.c +++ b/fs/jffs2/compr_rtime.c @@ -1,13 +1,13 @@ /* * JFFS2 -- Journalling Flash File System, Version 2. * - * Copyright (C) 2001-2003 Red Hat, Inc. + * Copyright © 2001-2007 Red Hat, Inc. + * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> * * 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. @@ -24,33 +24,32 @@ #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 */ static int jffs2_rtime_compress(unsigned char *data_in, unsigned char *cpage_out, - uint32_t *sourcelen, uint32_t *dstlen, - void *model) + uint32_t *sourcelen, uint32_t *dstlen) { - short positions[256]; + unsigned short positions[256]; 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++; @@ -63,35 +62,34 @@ static int jffs2_rtime_compress(unsigned char *data_in, /* 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, unsigned char *cpage_out, - uint32_t srclen, uint32_t destlen, - void *model) + uint32_t srclen, uint32_t destlen) { - short positions[256]; + unsigned 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) { @@ -101,12 +99,12 @@ static int jffs2_rtime_decompress(unsigned char *data_in, } } 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, |