Root/
1 | #ifdef STATIC |
2 | /* Pre-boot environment: included */ |
3 | |
4 | /* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots |
5 | * errors about console_printk etc... on ARM */ |
6 | #define _LINUX_KERNEL_H |
7 | |
8 | #include "zlib_inflate/inftrees.c" |
9 | #include "zlib_inflate/inffast.c" |
10 | #include "zlib_inflate/inflate.c" |
11 | |
12 | #else /* STATIC */ |
13 | /* initramfs et al: linked */ |
14 | |
15 | #include <linux/zutil.h> |
16 | |
17 | #include "zlib_inflate/inftrees.h" |
18 | #include "zlib_inflate/inffast.h" |
19 | #include "zlib_inflate/inflate.h" |
20 | |
21 | #include "zlib_inflate/infutil.h" |
22 | #include <linux/slab.h> |
23 | |
24 | #endif /* STATIC */ |
25 | |
26 | #include <linux/decompress/mm.h> |
27 | |
28 | #define GZIP_IOBUF_SIZE (16*1024) |
29 | |
30 | static int nofill(void *buffer, unsigned int len) |
31 | { |
32 | return -1; |
33 | } |
34 | |
35 | /* Included from initramfs et al code */ |
36 | STATIC int INIT gunzip(unsigned char *buf, int len, |
37 | int(*fill)(void*, unsigned int), |
38 | int(*flush)(void*, unsigned int), |
39 | unsigned char *out_buf, |
40 | int *pos, |
41 | void(*error_fn)(char *x)) { |
42 | u8 *zbuf; |
43 | struct z_stream_s *strm; |
44 | int rc; |
45 | size_t out_len; |
46 | |
47 | set_error_fn(error_fn); |
48 | rc = -1; |
49 | if (flush) { |
50 | out_len = 0x8000; /* 32 K */ |
51 | out_buf = malloc(out_len); |
52 | } else { |
53 | out_len = 0x7fffffff; /* no limit */ |
54 | } |
55 | if (!out_buf) { |
56 | error("Out of memory while allocating output buffer"); |
57 | goto gunzip_nomem1; |
58 | } |
59 | |
60 | if (buf) |
61 | zbuf = buf; |
62 | else { |
63 | zbuf = malloc(GZIP_IOBUF_SIZE); |
64 | len = 0; |
65 | } |
66 | if (!zbuf) { |
67 | error("Out of memory while allocating input buffer"); |
68 | goto gunzip_nomem2; |
69 | } |
70 | |
71 | strm = malloc(sizeof(*strm)); |
72 | if (strm == NULL) { |
73 | error("Out of memory while allocating z_stream"); |
74 | goto gunzip_nomem3; |
75 | } |
76 | |
77 | strm->workspace = malloc(flush ? zlib_inflate_workspacesize() : |
78 | sizeof(struct inflate_state)); |
79 | if (strm->workspace == NULL) { |
80 | error("Out of memory while allocating workspace"); |
81 | goto gunzip_nomem4; |
82 | } |
83 | |
84 | if (!fill) |
85 | fill = nofill; |
86 | |
87 | if (len == 0) |
88 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
89 | |
90 | /* verify the gzip header */ |
91 | if (len < 10 || |
92 | zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) { |
93 | if (pos) |
94 | *pos = 0; |
95 | error("Not a gzip file"); |
96 | goto gunzip_5; |
97 | } |
98 | |
99 | /* skip over gzip header (1f,8b,08... 10 bytes total + |
100 | * possible asciz filename) |
101 | */ |
102 | strm->next_in = zbuf + 10; |
103 | /* skip over asciz filename */ |
104 | if (zbuf[3] & 0x8) { |
105 | while (strm->next_in[0]) |
106 | strm->next_in++; |
107 | strm->next_in++; |
108 | } |
109 | strm->avail_in = len - (strm->next_in - zbuf); |
110 | |
111 | strm->next_out = out_buf; |
112 | strm->avail_out = out_len; |
113 | |
114 | rc = zlib_inflateInit2(strm, -MAX_WBITS); |
115 | |
116 | if (!flush) { |
117 | WS(strm)->inflate_state.wsize = 0; |
118 | WS(strm)->inflate_state.window = NULL; |
119 | } |
120 | |
121 | while (rc == Z_OK) { |
122 | if (strm->avail_in == 0) { |
123 | /* TODO: handle case where both pos and fill are set */ |
124 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
125 | if (len < 0) { |
126 | rc = -1; |
127 | error("read error"); |
128 | break; |
129 | } |
130 | strm->next_in = zbuf; |
131 | strm->avail_in = len; |
132 | } |
133 | rc = zlib_inflate(strm, 0); |
134 | |
135 | /* Write any data generated */ |
136 | if (flush && strm->next_out > out_buf) { |
137 | int l = strm->next_out - out_buf; |
138 | if (l != flush(out_buf, l)) { |
139 | rc = -1; |
140 | error("write error"); |
141 | break; |
142 | } |
143 | strm->next_out = out_buf; |
144 | strm->avail_out = out_len; |
145 | } |
146 | |
147 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ |
148 | if (rc == Z_STREAM_END) { |
149 | rc = 0; |
150 | break; |
151 | } else if (rc != Z_OK) { |
152 | error("uncompression error"); |
153 | rc = -1; |
154 | } |
155 | } |
156 | |
157 | zlib_inflateEnd(strm); |
158 | if (pos) |
159 | /* add + 8 to skip over trailer */ |
160 | *pos = strm->next_in - zbuf+8; |
161 | |
162 | gunzip_5: |
163 | free(strm->workspace); |
164 | gunzip_nomem4: |
165 | free(strm); |
166 | gunzip_nomem3: |
167 | if (!buf) |
168 | free(zbuf); |
169 | gunzip_nomem2: |
170 | if (flush) |
171 | free(out_buf); |
172 | gunzip_nomem1: |
173 | return rc; /* returns Z_OK (0) if successful */ |
174 | } |
175 | |
176 | #define decompress gunzip |
177 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9