diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /lib/zlib_inflate/inflate.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'lib/zlib_inflate/inflate.c')
-rw-r--r-- | lib/zlib_inflate/inflate.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/lib/zlib_inflate/inflate.c b/lib/zlib_inflate/inflate.c new file mode 100644 index 000000000000..3d94cb90c1d3 --- /dev/null +++ b/lib/zlib_inflate/inflate.c | |||
@@ -0,0 +1,248 @@ | |||
1 | /* inflate.c -- zlib interface to inflate modules | ||
2 | * Copyright (C) 1995-1998 Mark Adler | ||
3 | * For conditions of distribution and use, see copyright notice in zlib.h | ||
4 | */ | ||
5 | |||
6 | #include <linux/module.h> | ||
7 | #include <linux/zutil.h> | ||
8 | #include "infblock.h" | ||
9 | #include "infutil.h" | ||
10 | |||
11 | int zlib_inflate_workspacesize(void) | ||
12 | { | ||
13 | return sizeof(struct inflate_workspace); | ||
14 | } | ||
15 | |||
16 | |||
17 | int zlib_inflateReset( | ||
18 | z_streamp z | ||
19 | ) | ||
20 | { | ||
21 | if (z == NULL || z->state == NULL || z->workspace == NULL) | ||
22 | return Z_STREAM_ERROR; | ||
23 | z->total_in = z->total_out = 0; | ||
24 | z->msg = NULL; | ||
25 | z->state->mode = z->state->nowrap ? BLOCKS : METHOD; | ||
26 | zlib_inflate_blocks_reset(z->state->blocks, z, NULL); | ||
27 | return Z_OK; | ||
28 | } | ||
29 | |||
30 | |||
31 | int zlib_inflateEnd( | ||
32 | z_streamp z | ||
33 | ) | ||
34 | { | ||
35 | if (z == NULL || z->state == NULL || z->workspace == NULL) | ||
36 | return Z_STREAM_ERROR; | ||
37 | if (z->state->blocks != NULL) | ||
38 | zlib_inflate_blocks_free(z->state->blocks, z); | ||
39 | z->state = NULL; | ||
40 | return Z_OK; | ||
41 | } | ||
42 | |||
43 | |||
44 | int zlib_inflateInit2_( | ||
45 | z_streamp z, | ||
46 | int w, | ||
47 | const char *version, | ||
48 | int stream_size | ||
49 | ) | ||
50 | { | ||
51 | if (version == NULL || version[0] != ZLIB_VERSION[0] || | ||
52 | stream_size != sizeof(z_stream) || z->workspace == NULL) | ||
53 | return Z_VERSION_ERROR; | ||
54 | |||
55 | /* initialize state */ | ||
56 | z->msg = NULL; | ||
57 | z->state = &WS(z)->internal_state; | ||
58 | z->state->blocks = NULL; | ||
59 | |||
60 | /* handle undocumented nowrap option (no zlib header or check) */ | ||
61 | z->state->nowrap = 0; | ||
62 | if (w < 0) | ||
63 | { | ||
64 | w = - w; | ||
65 | z->state->nowrap = 1; | ||
66 | } | ||
67 | |||
68 | /* set window size */ | ||
69 | if (w < 8 || w > 15) | ||
70 | { | ||
71 | zlib_inflateEnd(z); | ||
72 | return Z_STREAM_ERROR; | ||
73 | } | ||
74 | z->state->wbits = (uInt)w; | ||
75 | |||
76 | /* create inflate_blocks state */ | ||
77 | if ((z->state->blocks = | ||
78 | zlib_inflate_blocks_new(z, z->state->nowrap ? NULL : zlib_adler32, (uInt)1 << w)) | ||
79 | == NULL) | ||
80 | { | ||
81 | zlib_inflateEnd(z); | ||
82 | return Z_MEM_ERROR; | ||
83 | } | ||
84 | |||
85 | /* reset state */ | ||
86 | zlib_inflateReset(z); | ||
87 | return Z_OK; | ||
88 | } | ||
89 | |||
90 | |||
91 | /* | ||
92 | * At the end of a Deflate-compressed PPP packet, we expect to have seen | ||
93 | * a `stored' block type value but not the (zero) length bytes. | ||
94 | */ | ||
95 | static int zlib_inflate_packet_flush(inflate_blocks_statef *s) | ||
96 | { | ||
97 | if (s->mode != LENS) | ||
98 | return Z_DATA_ERROR; | ||
99 | s->mode = TYPE; | ||
100 | return Z_OK; | ||
101 | } | ||
102 | |||
103 | |||
104 | int zlib_inflateInit_( | ||
105 | z_streamp z, | ||
106 | const char *version, | ||
107 | int stream_size | ||
108 | ) | ||
109 | { | ||
110 | return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size); | ||
111 | } | ||
112 | |||
113 | #undef NEEDBYTE | ||
114 | #undef NEXTBYTE | ||
115 | #define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;} | ||
116 | #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++) | ||
117 | |||
118 | int zlib_inflate( | ||
119 | z_streamp z, | ||
120 | int f | ||
121 | ) | ||
122 | { | ||
123 | int r, trv; | ||
124 | uInt b; | ||
125 | |||
126 | if (z == NULL || z->state == NULL || z->next_in == NULL) | ||
127 | return Z_STREAM_ERROR; | ||
128 | trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK; | ||
129 | r = Z_BUF_ERROR; | ||
130 | while (1) switch (z->state->mode) | ||
131 | { | ||
132 | case METHOD: | ||
133 | NEEDBYTE | ||
134 | if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED) | ||
135 | { | ||
136 | z->state->mode = I_BAD; | ||
137 | z->msg = (char*)"unknown compression method"; | ||
138 | z->state->sub.marker = 5; /* can't try inflateSync */ | ||
139 | break; | ||
140 | } | ||
141 | if ((z->state->sub.method >> 4) + 8 > z->state->wbits) | ||
142 | { | ||
143 | z->state->mode = I_BAD; | ||
144 | z->msg = (char*)"invalid window size"; | ||
145 | z->state->sub.marker = 5; /* can't try inflateSync */ | ||
146 | break; | ||
147 | } | ||
148 | z->state->mode = FLAG; | ||
149 | case FLAG: | ||
150 | NEEDBYTE | ||
151 | b = NEXTBYTE; | ||
152 | if (((z->state->sub.method << 8) + b) % 31) | ||
153 | { | ||
154 | z->state->mode = I_BAD; | ||
155 | z->msg = (char*)"incorrect header check"; | ||
156 | z->state->sub.marker = 5; /* can't try inflateSync */ | ||
157 | break; | ||
158 | } | ||
159 | if (!(b & PRESET_DICT)) | ||
160 | { | ||
161 | z->state->mode = BLOCKS; | ||
162 | break; | ||
163 | } | ||
164 | z->state->mode = DICT4; | ||
165 | case DICT4: | ||
166 | NEEDBYTE | ||
167 | z->state->sub.check.need = (uLong)NEXTBYTE << 24; | ||
168 | z->state->mode = DICT3; | ||
169 | case DICT3: | ||
170 | NEEDBYTE | ||
171 | z->state->sub.check.need += (uLong)NEXTBYTE << 16; | ||
172 | z->state->mode = DICT2; | ||
173 | case DICT2: | ||
174 | NEEDBYTE | ||
175 | z->state->sub.check.need += (uLong)NEXTBYTE << 8; | ||
176 | z->state->mode = DICT1; | ||
177 | case DICT1: | ||
178 | NEEDBYTE | ||
179 | z->state->sub.check.need += (uLong)NEXTBYTE; | ||
180 | z->adler = z->state->sub.check.need; | ||
181 | z->state->mode = DICT0; | ||
182 | return Z_NEED_DICT; | ||
183 | case DICT0: | ||
184 | z->state->mode = I_BAD; | ||
185 | z->msg = (char*)"need dictionary"; | ||
186 | z->state->sub.marker = 0; /* can try inflateSync */ | ||
187 | return Z_STREAM_ERROR; | ||
188 | case BLOCKS: | ||
189 | r = zlib_inflate_blocks(z->state->blocks, z, r); | ||
190 | if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0) | ||
191 | r = zlib_inflate_packet_flush(z->state->blocks); | ||
192 | if (r == Z_DATA_ERROR) | ||
193 | { | ||
194 | z->state->mode = I_BAD; | ||
195 | z->state->sub.marker = 0; /* can try inflateSync */ | ||
196 | break; | ||
197 | } | ||
198 | if (r == Z_OK) | ||
199 | r = trv; | ||
200 | if (r != Z_STREAM_END) | ||
201 | return r; | ||
202 | r = trv; | ||
203 | zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was); | ||
204 | if (z->state->nowrap) | ||
205 | { | ||
206 | z->state->mode = I_DONE; | ||
207 | break; | ||
208 | } | ||
209 | z->state->mode = CHECK4; | ||
210 | case CHECK4: | ||
211 | NEEDBYTE | ||
212 | z->state->sub.check.need = (uLong)NEXTBYTE << 24; | ||
213 | z->state->mode = CHECK3; | ||
214 | case CHECK3: | ||
215 | NEEDBYTE | ||
216 | z->state->sub.check.need += (uLong)NEXTBYTE << 16; | ||
217 | z->state->mode = CHECK2; | ||
218 | case CHECK2: | ||
219 | NEEDBYTE | ||
220 | z->state->sub.check.need += (uLong)NEXTBYTE << 8; | ||
221 | z->state->mode = CHECK1; | ||
222 | case CHECK1: | ||
223 | NEEDBYTE | ||
224 | z->state->sub.check.need += (uLong)NEXTBYTE; | ||
225 | |||
226 | if (z->state->sub.check.was != z->state->sub.check.need) | ||
227 | { | ||
228 | z->state->mode = I_BAD; | ||
229 | z->msg = (char*)"incorrect data check"; | ||
230 | z->state->sub.marker = 5; /* can't try inflateSync */ | ||
231 | break; | ||
232 | } | ||
233 | z->state->mode = I_DONE; | ||
234 | case I_DONE: | ||
235 | return Z_STREAM_END; | ||
236 | case I_BAD: | ||
237 | return Z_DATA_ERROR; | ||
238 | default: | ||
239 | return Z_STREAM_ERROR; | ||
240 | } | ||
241 | empty: | ||
242 | if (f != Z_PACKET_FLUSH) | ||
243 | return r; | ||
244 | z->state->mode = I_BAD; | ||
245 | z->msg = (char *)"need more for packet flush"; | ||
246 | z->state->sub.marker = 0; /* can try inflateSync */ | ||
247 | return Z_DATA_ERROR; | ||
248 | } | ||