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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [jffs2/] [compr_zlib.c] - Rev 1765
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/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2001, 2002 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@cambridge.redhat.com> * * The original JFFS, from which the design for JFFS2 was derived, * was designed and implemented by Axis Communications AB. * * The contents of this file are subject to the Red Hat eCos Public * License Version 1.1 (the "Licence"); you may not use this file * except in compliance with the Licence. You may obtain a copy of * the Licence at http://www.redhat.com/ * * Software distributed under the Licence is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. * See the Licence for the specific language governing rights and * limitations under the Licence. * * The Original Code is JFFS2 - Journalling Flash File System, version 2 * * Alternatively, the contents of this file may be used under the * terms of the GNU General Public License version 2 (the "GPL"), in * which case the provisions of the GPL are applicable instead of the * above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the RHEPL, indicate your decision by * deleting the provisions above and replace them with the notice and * other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file * under either the RHEPL or the GPL. * * $Id: compr_zlib.c,v 1.1.1.1 2004-04-15 01:11:03 phoenix Exp $ * */ #ifndef __KERNEL__ #error "The userspace support got too messy and was removed. Update your mkfs.jffs2" #endif #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 "nodelist.h" /* 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 avail_in == 0 and avail_out set to the remaining 12 bytes for it to clean up. Q: Is 12 bytes sufficient? */ #define STREAM_END_SPACE 12 static DECLARE_MUTEX(deflate_sem); static DECLARE_MUTEX(inflate_sem); static void *deflate_workspace; static void *inflate_workspace; int __init jffs2_zlib_init(void) { deflate_workspace = vmalloc(zlib_deflate_workspacesize()); if (!deflate_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())); inflate_workspace = vmalloc(zlib_inflate_workspacesize()); if (!inflate_workspace) { printk(KERN_WARNING "Failed to allocate %d bytes for inflate workspace\n", zlib_inflate_workspacesize()); vfree(deflate_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(deflate_workspace); vfree(inflate_workspace); } int zlib_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen) { z_stream strm; int ret; if (*dstlen <= STREAM_END_SPACE) return -1; down(&deflate_sem); strm.workspace = deflate_workspace; if (Z_OK != zlib_deflateInit(&strm, 3)) { printk(KERN_WARNING "deflateInit failed\n"); up(&deflate_sem); return -1; } strm.next_in = data_in; strm.total_in = 0; strm.next_out = cpage_out; 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); D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n", strm.avail_in, strm.avail_out)); ret = zlib_deflate(&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)); if (ret != Z_OK) { D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret)); zlib_deflateEnd(&strm); up(&deflate_sem); return -1; } } strm.avail_out += STREAM_END_SPACE; strm.avail_in = 0; ret = zlib_deflate(&strm, Z_FINISH); zlib_deflateEnd(&strm); up(&deflate_sem); if (ret != Z_STREAM_END) { D1(printk(KERN_DEBUG "final deflate returned %d\n", ret)); return -1; } 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; *dstlen = strm.total_out; *sourcelen = strm.total_in; return 0; } void zlib_decompress(unsigned char *data_in, unsigned char *cpage_out, __u32 srclen, __u32 destlen) { z_stream strm; int ret; down(&inflate_sem); strm.workspace = inflate_workspace; if (Z_OK != zlib_inflateInit(&strm)) { 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 = zlib_inflate(&strm, Z_FINISH)) == Z_OK) ; if (ret != Z_STREAM_END) { printk(KERN_NOTICE "inflate returned %d\n", ret); } zlib_inflateEnd(&strm); up(&inflate_sem); }