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1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13#if !defined(__KERNEL__) && !defined(__ECOS)
14#error "The userspace support got too messy and was removed. Update your mkfs.jffs2"
15#endif
16
17#include <linux/kernel.h>
18#include <linux/zlib.h>
19#include <linux/zutil.h>
20#include "nodelist.h"
21#include "compr.h"
22
23 /* Plan: call deflate() with avail_in == *sourcelen,
24 avail_out = *dstlen - 12 and flush == Z_FINISH.
25 If it doesn't manage to finish, call it again with
26 avail_in == 0 and avail_out set to the remaining 12
27 bytes for it to clean up.
28 Q: Is 12 bytes sufficient?
29 */
30#define STREAM_END_SPACE 12
31
32static DEFINE_MUTEX(deflate_mutex);
33static DEFINE_MUTEX(inflate_mutex);
34static z_stream inf_strm, def_strm;
35
36#ifdef __KERNEL__ /* Linux-only */
37#include <linux/vmalloc.h>
38#include <linux/init.h>
39#include <linux/mutex.h>
40
41static int __init alloc_workspaces(void)
42{
43 def_strm.workspace = vmalloc(zlib_deflate_workspacesize(MAX_WBITS,
44 MAX_MEM_LEVEL));
45 if (!def_strm.workspace) {
46 printk(KERN_WARNING "Failed to allocate %d bytes for deflate workspace\n", zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL));
47 return -ENOMEM;
48 }
49 D1(printk(KERN_DEBUG "Allocated %d bytes for deflate workspace\n", zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL)));
50 inf_strm.workspace = vmalloc(zlib_inflate_workspacesize());
51 if (!inf_strm.workspace) {
52 printk(KERN_WARNING "Failed to allocate %d bytes for inflate workspace\n", zlib_inflate_workspacesize());
53 vfree(def_strm.workspace);
54 return -ENOMEM;
55 }
56 D1(printk(KERN_DEBUG "Allocated %d bytes for inflate workspace\n", zlib_inflate_workspacesize()));
57 return 0;
58}
59
60static void free_workspaces(void)
61{
62 vfree(def_strm.workspace);
63 vfree(inf_strm.workspace);
64}
65#else
66#define alloc_workspaces() (0)
67#define free_workspaces() do { } while(0)
68#endif /* __KERNEL__ */
69
70static int jffs2_zlib_compress(unsigned char *data_in,
71 unsigned char *cpage_out,
72 uint32_t *sourcelen, uint32_t *dstlen)
73{
74 int ret;
75
76 if (*dstlen <= STREAM_END_SPACE)
77 return -1;
78
79 mutex_lock(&deflate_mutex);
80
81 if (Z_OK != zlib_deflateInit(&def_strm, 3)) {
82 printk(KERN_WARNING "deflateInit failed\n");
83 mutex_unlock(&deflate_mutex);
84 return -1;
85 }
86
87 def_strm.next_in = data_in;
88 def_strm.total_in = 0;
89
90 def_strm.next_out = cpage_out;
91 def_strm.total_out = 0;
92
93 while (def_strm.total_out < *dstlen - STREAM_END_SPACE && def_strm.total_in < *sourcelen) {
94 def_strm.avail_out = *dstlen - (def_strm.total_out + STREAM_END_SPACE);
95 def_strm.avail_in = min((unsigned)(*sourcelen-def_strm.total_in), def_strm.avail_out);
96 D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
97 def_strm.avail_in, def_strm.avail_out));
98 ret = zlib_deflate(&def_strm, Z_PARTIAL_FLUSH);
99 D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n",
100 def_strm.avail_in, def_strm.avail_out, def_strm.total_in, def_strm.total_out));
101 if (ret != Z_OK) {
102 D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
103 zlib_deflateEnd(&def_strm);
104 mutex_unlock(&deflate_mutex);
105 return -1;
106 }
107 }
108 def_strm.avail_out += STREAM_END_SPACE;
109 def_strm.avail_in = 0;
110 ret = zlib_deflate(&def_strm, Z_FINISH);
111 zlib_deflateEnd(&def_strm);
112
113 if (ret != Z_STREAM_END) {
114 D1(printk(KERN_DEBUG "final deflate returned %d\n", ret));
115 ret = -1;
116 goto out;
117 }
118
119 if (def_strm.total_out >= def_strm.total_in) {
120 D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld; failing\n",
121 def_strm.total_in, def_strm.total_out));
122 ret = -1;
123 goto out;
124 }
125
126 D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n",
127 def_strm.total_in, def_strm.total_out));
128
129 *dstlen = def_strm.total_out;
130 *sourcelen = def_strm.total_in;
131 ret = 0;
132 out:
133 mutex_unlock(&deflate_mutex);
134 return ret;
135}
136
137static int jffs2_zlib_decompress(unsigned char *data_in,
138 unsigned char *cpage_out,
139 uint32_t srclen, uint32_t destlen)
140{
141 int ret;
142 int wbits = MAX_WBITS;
143
144 mutex_lock(&inflate_mutex);
145
146 inf_strm.next_in = data_in;
147 inf_strm.avail_in = srclen;
148 inf_strm.total_in = 0;
149
150 inf_strm.next_out = cpage_out;
151 inf_strm.avail_out = destlen;
152 inf_strm.total_out = 0;
153
154 /* If it's deflate, and it's got no preset dictionary, then
155 we can tell zlib to skip the adler32 check. */
156 if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
157 ((data_in[0] & 0x0f) == Z_DEFLATED) &&
158 !(((data_in[0]<<8) + data_in[1]) % 31)) {
159
160 D2(printk(KERN_DEBUG "inflate skipping adler32\n"));
161 wbits = -((data_in[0] >> 4) + 8);
162 inf_strm.next_in += 2;
163 inf_strm.avail_in -= 2;
164 } else {
165 /* Let this remain D1 for now -- it should never happen */
166 D1(printk(KERN_DEBUG "inflate not skipping adler32\n"));
167 }
168
169
170 if (Z_OK != zlib_inflateInit2(&inf_strm, wbits)) {
171 printk(KERN_WARNING "inflateInit failed\n");
172 mutex_unlock(&inflate_mutex);
173 return 1;
174 }
175
176 while((ret = zlib_inflate(&inf_strm, Z_FINISH)) == Z_OK)
177 ;
178 if (ret != Z_STREAM_END) {
179 printk(KERN_NOTICE "inflate returned %d\n", ret);
180 }
181 zlib_inflateEnd(&inf_strm);
182 mutex_unlock(&inflate_mutex);
183 return 0;
184}
185
186static struct jffs2_compressor jffs2_zlib_comp = {
187 .priority = JFFS2_ZLIB_PRIORITY,
188 .name = "zlib",
189 .compr = JFFS2_COMPR_ZLIB,
190 .compress = &jffs2_zlib_compress,
191 .decompress = &jffs2_zlib_decompress,
192#ifdef JFFS2_ZLIB_DISABLED
193 .disabled = 1,
194#else
195 .disabled = 0,
196#endif
197};
198
199int __init jffs2_zlib_init(void)
200{
201 int ret;
202
203 ret = alloc_workspaces();
204 if (ret)
205 return ret;
206
207 ret = jffs2_register_compressor(&jffs2_zlib_comp);
208 if (ret)
209 free_workspaces();
210
211 return ret;
212}
213
214void jffs2_zlib_exit(void)
215{
216 jffs2_unregister_compressor(&jffs2_zlib_comp);
217 free_workspaces();
218}
1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13#if !defined(__KERNEL__) && !defined(__ECOS)
14#error "The userspace support got too messy and was removed. Update your mkfs.jffs2"
15#endif
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/kernel.h>
20#include <linux/zlib.h>
21#include <linux/zutil.h>
22#include "nodelist.h"
23#include "compr.h"
24
25 /* Plan: call deflate() with avail_in == *sourcelen,
26 avail_out = *dstlen - 12 and flush == Z_FINISH.
27 If it doesn't manage to finish, call it again with
28 avail_in == 0 and avail_out set to the remaining 12
29 bytes for it to clean up.
30 Q: Is 12 bytes sufficient?
31 */
32#define STREAM_END_SPACE 12
33
34static DEFINE_MUTEX(deflate_mutex);
35static DEFINE_MUTEX(inflate_mutex);
36static z_stream inf_strm, def_strm;
37
38#ifdef __KERNEL__ /* Linux-only */
39#include <linux/vmalloc.h>
40#include <linux/init.h>
41#include <linux/mutex.h>
42
43static int __init alloc_workspaces(void)
44{
45 def_strm.workspace = vmalloc(zlib_deflate_workspacesize(MAX_WBITS,
46 MAX_MEM_LEVEL));
47 if (!def_strm.workspace)
48 return -ENOMEM;
49
50 jffs2_dbg(1, "Allocated %d bytes for deflate workspace\n",
51 zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL));
52 inf_strm.workspace = vmalloc(zlib_inflate_workspacesize());
53 if (!inf_strm.workspace) {
54 vfree(def_strm.workspace);
55 return -ENOMEM;
56 }
57 jffs2_dbg(1, "Allocated %d bytes for inflate workspace\n",
58 zlib_inflate_workspacesize());
59 return 0;
60}
61
62static void free_workspaces(void)
63{
64 vfree(def_strm.workspace);
65 vfree(inf_strm.workspace);
66}
67#else
68#define alloc_workspaces() (0)
69#define free_workspaces() do { } while(0)
70#endif /* __KERNEL__ */
71
72static int jffs2_zlib_compress(unsigned char *data_in,
73 unsigned char *cpage_out,
74 uint32_t *sourcelen, uint32_t *dstlen)
75{
76 int ret;
77
78 if (*dstlen <= STREAM_END_SPACE)
79 return -1;
80
81 mutex_lock(&deflate_mutex);
82
83 if (Z_OK != zlib_deflateInit(&def_strm, 3)) {
84 pr_warn("deflateInit failed\n");
85 mutex_unlock(&deflate_mutex);
86 return -1;
87 }
88
89 def_strm.next_in = data_in;
90 def_strm.total_in = 0;
91
92 def_strm.next_out = cpage_out;
93 def_strm.total_out = 0;
94
95 while (def_strm.total_out < *dstlen - STREAM_END_SPACE && def_strm.total_in < *sourcelen) {
96 def_strm.avail_out = *dstlen - (def_strm.total_out + STREAM_END_SPACE);
97 def_strm.avail_in = min((unsigned)(*sourcelen-def_strm.total_in), def_strm.avail_out);
98 jffs2_dbg(1, "calling deflate with avail_in %d, avail_out %d\n",
99 def_strm.avail_in, def_strm.avail_out);
100 ret = zlib_deflate(&def_strm, Z_PARTIAL_FLUSH);
101 jffs2_dbg(1, "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n",
102 def_strm.avail_in, def_strm.avail_out,
103 def_strm.total_in, def_strm.total_out);
104 if (ret != Z_OK) {
105 jffs2_dbg(1, "deflate in loop returned %d\n", ret);
106 zlib_deflateEnd(&def_strm);
107 mutex_unlock(&deflate_mutex);
108 return -1;
109 }
110 }
111 def_strm.avail_out += STREAM_END_SPACE;
112 def_strm.avail_in = 0;
113 ret = zlib_deflate(&def_strm, Z_FINISH);
114 zlib_deflateEnd(&def_strm);
115
116 if (ret != Z_STREAM_END) {
117 jffs2_dbg(1, "final deflate returned %d\n", ret);
118 ret = -1;
119 goto out;
120 }
121
122 if (def_strm.total_out >= def_strm.total_in) {
123 jffs2_dbg(1, "zlib compressed %ld bytes into %ld; failing\n",
124 def_strm.total_in, def_strm.total_out);
125 ret = -1;
126 goto out;
127 }
128
129 jffs2_dbg(1, "zlib compressed %ld bytes into %ld\n",
130 def_strm.total_in, def_strm.total_out);
131
132 *dstlen = def_strm.total_out;
133 *sourcelen = def_strm.total_in;
134 ret = 0;
135 out:
136 mutex_unlock(&deflate_mutex);
137 return ret;
138}
139
140static int jffs2_zlib_decompress(unsigned char *data_in,
141 unsigned char *cpage_out,
142 uint32_t srclen, uint32_t destlen)
143{
144 int ret;
145 int wbits = MAX_WBITS;
146
147 mutex_lock(&inflate_mutex);
148
149 inf_strm.next_in = data_in;
150 inf_strm.avail_in = srclen;
151 inf_strm.total_in = 0;
152
153 inf_strm.next_out = cpage_out;
154 inf_strm.avail_out = destlen;
155 inf_strm.total_out = 0;
156
157 /* If it's deflate, and it's got no preset dictionary, then
158 we can tell zlib to skip the adler32 check. */
159 if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
160 ((data_in[0] & 0x0f) == Z_DEFLATED) &&
161 !(((data_in[0]<<8) + data_in[1]) % 31)) {
162
163 jffs2_dbg(2, "inflate skipping adler32\n");
164 wbits = -((data_in[0] >> 4) + 8);
165 inf_strm.next_in += 2;
166 inf_strm.avail_in -= 2;
167 } else {
168 /* Let this remain D1 for now -- it should never happen */
169 jffs2_dbg(1, "inflate not skipping adler32\n");
170 }
171
172
173 if (Z_OK != zlib_inflateInit2(&inf_strm, wbits)) {
174 pr_warn("inflateInit failed\n");
175 mutex_unlock(&inflate_mutex);
176 return 1;
177 }
178
179 while((ret = zlib_inflate(&inf_strm, Z_FINISH)) == Z_OK)
180 ;
181 if (ret != Z_STREAM_END) {
182 pr_notice("inflate returned %d\n", ret);
183 }
184 zlib_inflateEnd(&inf_strm);
185 mutex_unlock(&inflate_mutex);
186 return 0;
187}
188
189static struct jffs2_compressor jffs2_zlib_comp = {
190 .priority = JFFS2_ZLIB_PRIORITY,
191 .name = "zlib",
192 .compr = JFFS2_COMPR_ZLIB,
193 .compress = &jffs2_zlib_compress,
194 .decompress = &jffs2_zlib_decompress,
195#ifdef JFFS2_ZLIB_DISABLED
196 .disabled = 1,
197#else
198 .disabled = 0,
199#endif
200};
201
202int __init jffs2_zlib_init(void)
203{
204 int ret;
205
206 ret = alloc_workspaces();
207 if (ret)
208 return ret;
209
210 ret = jffs2_register_compressor(&jffs2_zlib_comp);
211 if (ret)
212 free_workspaces();
213
214 return ret;
215}
216
217void jffs2_zlib_exit(void)
218{
219 jffs2_unregister_compressor(&jffs2_zlib_comp);
220 free_workspaces();
221}