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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" | |
9e5cf0ca | 22 | #include <linux/slab.h> |
bc22c17e AK |
23 | |
24 | #endif /* STATIC */ | |
25 | ||
26 | #include <linux/decompress/mm.h> | |
27 | ||
daeb6b6f | 28 | #define GZIP_IOBUF_SIZE (16*1024) |
bc22c17e AK |
29 | |
30 | /* Included from initramfs et al code */ | |
31 | STATIC int INIT gunzip(unsigned char *buf, int len, | |
32 | int(*fill)(void*, unsigned int), | |
33 | int(*flush)(void*, unsigned int), | |
34 | unsigned char *out_buf, | |
35 | int *pos, | |
36 | void(*error_fn)(char *x)) { | |
37 | u8 *zbuf; | |
38 | struct z_stream_s *strm; | |
39 | int rc; | |
40 | size_t out_len; | |
41 | ||
42 | set_error_fn(error_fn); | |
43 | rc = -1; | |
44 | if (flush) { | |
5619448f | 45 | out_len = 0x8000; /* 32 K */ |
bc22c17e AK |
46 | out_buf = malloc(out_len); |
47 | } else { | |
48 | out_len = 0x7fffffff; /* no limit */ | |
49 | } | |
50 | if (!out_buf) { | |
51 | error("Out of memory while allocating output buffer"); | |
52 | goto gunzip_nomem1; | |
53 | } | |
54 | ||
55 | if (buf) | |
56 | zbuf = buf; | |
57 | else { | |
daeb6b6f | 58 | zbuf = malloc(GZIP_IOBUF_SIZE); |
bc22c17e AK |
59 | len = 0; |
60 | } | |
61 | if (!zbuf) { | |
62 | error("Out of memory while allocating input buffer"); | |
63 | goto gunzip_nomem2; | |
64 | } | |
65 | ||
66 | strm = malloc(sizeof(*strm)); | |
67 | if (strm == NULL) { | |
68 | error("Out of memory while allocating z_stream"); | |
69 | goto gunzip_nomem3; | |
70 | } | |
71 | ||
72 | strm->workspace = malloc(flush ? zlib_inflate_workspacesize() : | |
73 | sizeof(struct inflate_state)); | |
74 | if (strm->workspace == NULL) { | |
75 | error("Out of memory while allocating workspace"); | |
76 | goto gunzip_nomem4; | |
77 | } | |
78 | ||
79 | if (len == 0) | |
daeb6b6f | 80 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
81 | |
82 | /* verify the gzip header */ | |
83 | if (len < 10 || | |
84 | zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) { | |
85 | if (pos) | |
86 | *pos = 0; | |
87 | error("Not a gzip file"); | |
88 | goto gunzip_5; | |
89 | } | |
90 | ||
91 | /* skip over gzip header (1f,8b,08... 10 bytes total + | |
92 | * possible asciz filename) | |
93 | */ | |
94 | strm->next_in = zbuf + 10; | |
95 | /* skip over asciz filename */ | |
96 | if (zbuf[3] & 0x8) { | |
97 | while (strm->next_in[0]) | |
98 | strm->next_in++; | |
99 | strm->next_in++; | |
100 | } | |
6c11b12a | 101 | strm->avail_in = len - (strm->next_in - zbuf); |
bc22c17e AK |
102 | |
103 | strm->next_out = out_buf; | |
104 | strm->avail_out = out_len; | |
105 | ||
106 | rc = zlib_inflateInit2(strm, -MAX_WBITS); | |
107 | ||
108 | if (!flush) { | |
109 | WS(strm)->inflate_state.wsize = 0; | |
110 | WS(strm)->inflate_state.window = NULL; | |
111 | } | |
112 | ||
113 | while (rc == Z_OK) { | |
114 | if (strm->avail_in == 0) { | |
115 | /* TODO: handle case where both pos and fill are set */ | |
daeb6b6f | 116 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
117 | if (len < 0) { |
118 | rc = -1; | |
119 | error("read error"); | |
120 | break; | |
121 | } | |
122 | strm->next_in = zbuf; | |
123 | strm->avail_in = len; | |
124 | } | |
125 | rc = zlib_inflate(strm, 0); | |
126 | ||
127 | /* Write any data generated */ | |
128 | if (flush && strm->next_out > out_buf) { | |
129 | int l = strm->next_out - out_buf; | |
130 | if (l != flush(out_buf, l)) { | |
131 | rc = -1; | |
132 | error("write error"); | |
133 | break; | |
134 | } | |
135 | strm->next_out = out_buf; | |
136 | strm->avail_out = out_len; | |
137 | } | |
138 | ||
139 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ | |
140 | if (rc == Z_STREAM_END) { | |
141 | rc = 0; | |
142 | break; | |
143 | } else if (rc != Z_OK) { | |
144 | error("uncompression error"); | |
145 | rc = -1; | |
146 | } | |
147 | } | |
148 | ||
149 | zlib_inflateEnd(strm); | |
150 | if (pos) | |
151 | /* add + 8 to skip over trailer */ | |
152 | *pos = strm->next_in - zbuf+8; | |
153 | ||
154 | gunzip_5: | |
155 | free(strm->workspace); | |
156 | gunzip_nomem4: | |
157 | free(strm); | |
158 | gunzip_nomem3: | |
159 | if (!buf) | |
160 | free(zbuf); | |
161 | gunzip_nomem2: | |
162 | if (flush) | |
163 | free(out_buf); | |
164 | gunzip_nomem1: | |
165 | return rc; /* returns Z_OK (0) if successful */ | |
166 | } | |
167 | ||
168 | #define decompress gunzip |