Commit | Line | Data |
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bc22c17e AK |
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 | ||
23 | #endif /* STATIC */ | |
24 | ||
25 | #include <linux/decompress/mm.h> | |
26 | ||
daeb6b6f | 27 | #define GZIP_IOBUF_SIZE (16*1024) |
bc22c17e | 28 | |
6b01ed64 | 29 | static int INIT nofill(void *buffer, unsigned int len) |
6a881162 PL |
30 | { |
31 | return -1; | |
32 | } | |
33 | ||
bc22c17e AK |
34 | /* Included from initramfs et al code */ |
35 | STATIC int INIT gunzip(unsigned char *buf, int len, | |
36 | int(*fill)(void*, unsigned int), | |
37 | int(*flush)(void*, unsigned int), | |
38 | unsigned char *out_buf, | |
39 | int *pos, | |
93685ad2 | 40 | void(*error)(char *x)) { |
bc22c17e AK |
41 | u8 *zbuf; |
42 | struct z_stream_s *strm; | |
43 | int rc; | |
44 | size_t out_len; | |
45 | ||
bc22c17e AK |
46 | rc = -1; |
47 | if (flush) { | |
5619448f | 48 | out_len = 0x8000; /* 32 K */ |
bc22c17e AK |
49 | out_buf = malloc(out_len); |
50 | } else { | |
51 | out_len = 0x7fffffff; /* no limit */ | |
52 | } | |
53 | if (!out_buf) { | |
54 | error("Out of memory while allocating output buffer"); | |
55 | goto gunzip_nomem1; | |
56 | } | |
57 | ||
58 | if (buf) | |
59 | zbuf = buf; | |
60 | else { | |
daeb6b6f | 61 | zbuf = malloc(GZIP_IOBUF_SIZE); |
bc22c17e AK |
62 | len = 0; |
63 | } | |
64 | if (!zbuf) { | |
65 | error("Out of memory while allocating input buffer"); | |
66 | goto gunzip_nomem2; | |
67 | } | |
68 | ||
69 | strm = malloc(sizeof(*strm)); | |
70 | if (strm == NULL) { | |
71 | error("Out of memory while allocating z_stream"); | |
72 | goto gunzip_nomem3; | |
73 | } | |
74 | ||
75 | strm->workspace = malloc(flush ? zlib_inflate_workspacesize() : | |
76 | sizeof(struct inflate_state)); | |
77 | if (strm->workspace == NULL) { | |
78 | error("Out of memory while allocating workspace"); | |
79 | goto gunzip_nomem4; | |
80 | } | |
81 | ||
6a881162 PL |
82 | if (!fill) |
83 | fill = nofill; | |
84 | ||
bc22c17e | 85 | if (len == 0) |
daeb6b6f | 86 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
87 | |
88 | /* verify the gzip header */ | |
89 | if (len < 10 || | |
90 | zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) { | |
91 | if (pos) | |
92 | *pos = 0; | |
93 | error("Not a gzip file"); | |
94 | goto gunzip_5; | |
95 | } | |
96 | ||
97 | /* skip over gzip header (1f,8b,08... 10 bytes total + | |
98 | * possible asciz filename) | |
99 | */ | |
100 | strm->next_in = zbuf + 10; | |
101 | /* skip over asciz filename */ | |
102 | if (zbuf[3] & 0x8) { | |
103 | while (strm->next_in[0]) | |
104 | strm->next_in++; | |
105 | strm->next_in++; | |
106 | } | |
6c11b12a | 107 | strm->avail_in = len - (strm->next_in - zbuf); |
bc22c17e AK |
108 | |
109 | strm->next_out = out_buf; | |
110 | strm->avail_out = out_len; | |
111 | ||
112 | rc = zlib_inflateInit2(strm, -MAX_WBITS); | |
113 | ||
114 | if (!flush) { | |
115 | WS(strm)->inflate_state.wsize = 0; | |
116 | WS(strm)->inflate_state.window = NULL; | |
117 | } | |
118 | ||
119 | while (rc == Z_OK) { | |
120 | if (strm->avail_in == 0) { | |
121 | /* TODO: handle case where both pos and fill are set */ | |
daeb6b6f | 122 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
123 | if (len < 0) { |
124 | rc = -1; | |
125 | error("read error"); | |
126 | break; | |
127 | } | |
128 | strm->next_in = zbuf; | |
129 | strm->avail_in = len; | |
130 | } | |
131 | rc = zlib_inflate(strm, 0); | |
132 | ||
133 | /* Write any data generated */ | |
134 | if (flush && strm->next_out > out_buf) { | |
135 | int l = strm->next_out - out_buf; | |
136 | if (l != flush(out_buf, l)) { | |
137 | rc = -1; | |
138 | error("write error"); | |
139 | break; | |
140 | } | |
141 | strm->next_out = out_buf; | |
142 | strm->avail_out = out_len; | |
143 | } | |
144 | ||
145 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ | |
146 | if (rc == Z_STREAM_END) { | |
147 | rc = 0; | |
148 | break; | |
149 | } else if (rc != Z_OK) { | |
150 | error("uncompression error"); | |
151 | rc = -1; | |
152 | } | |
153 | } | |
154 | ||
155 | zlib_inflateEnd(strm); | |
156 | if (pos) | |
157 | /* add + 8 to skip over trailer */ | |
158 | *pos = strm->next_in - zbuf+8; | |
159 | ||
160 | gunzip_5: | |
161 | free(strm->workspace); | |
162 | gunzip_nomem4: | |
163 | free(strm); | |
164 | gunzip_nomem3: | |
165 | if (!buf) | |
166 | free(zbuf); | |
167 | gunzip_nomem2: | |
168 | if (flush) | |
169 | free(out_buf); | |
170 | gunzip_nomem1: | |
171 | return rc; /* returns Z_OK (0) if successful */ | |
172 | } | |
173 | ||
174 | #define decompress gunzip |