Commit | Line | Data |
---|---|---|
bc22c17e | 1 | #ifdef STATIC |
2d3862d2 | 2 | #define PREBOOT |
bc22c17e AK |
3 | /* Pre-boot environment: included */ |
4 | ||
5 | /* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots | |
6 | * errors about console_printk etc... on ARM */ | |
7 | #define _LINUX_KERNEL_H | |
8 | ||
9 | #include "zlib_inflate/inftrees.c" | |
10 | #include "zlib_inflate/inffast.c" | |
11 | #include "zlib_inflate/inflate.c" | |
12 | ||
13 | #else /* STATIC */ | |
14 | /* initramfs et al: linked */ | |
15 | ||
16 | #include <linux/zutil.h> | |
17 | ||
18 | #include "zlib_inflate/inftrees.h" | |
19 | #include "zlib_inflate/inffast.h" | |
20 | #include "zlib_inflate/inflate.h" | |
21 | ||
22 | #include "zlib_inflate/infutil.h" | |
af661e83 | 23 | #include <linux/decompress/inflate.h> |
bc22c17e AK |
24 | |
25 | #endif /* STATIC */ | |
26 | ||
27 | #include <linux/decompress/mm.h> | |
28 | ||
daeb6b6f | 29 | #define GZIP_IOBUF_SIZE (16*1024) |
bc22c17e | 30 | |
d97b07c5 | 31 | static long INIT nofill(void *buffer, unsigned long len) |
6a881162 PL |
32 | { |
33 | return -1; | |
34 | } | |
35 | ||
bc22c17e | 36 | /* Included from initramfs et al code */ |
2d3862d2 | 37 | STATIC int INIT __gunzip(unsigned char *buf, long len, |
d97b07c5 YL |
38 | long (*fill)(void*, unsigned long), |
39 | long (*flush)(void*, unsigned long), | |
2d3862d2 | 40 | unsigned char *out_buf, long out_len, |
d97b07c5 | 41 | long *pos, |
93685ad2 | 42 | void(*error)(char *x)) { |
bc22c17e AK |
43 | u8 *zbuf; |
44 | struct z_stream_s *strm; | |
45 | int rc; | |
bc22c17e | 46 | |
bc22c17e AK |
47 | rc = -1; |
48 | if (flush) { | |
5619448f | 49 | out_len = 0x8000; /* 32 K */ |
bc22c17e AK |
50 | out_buf = malloc(out_len); |
51 | } else { | |
2d3862d2 YL |
52 | if (!out_len) |
53 | out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */ | |
bc22c17e AK |
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 { | |
daeb6b6f | 63 | zbuf = malloc(GZIP_IOBUF_SIZE); |
bc22c17e AK |
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 | ||
6a881162 PL |
84 | if (!fill) |
85 | fill = nofill; | |
86 | ||
bc22c17e | 87 | if (len == 0) |
daeb6b6f | 88 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
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; | |
1da914e0 | 103 | strm->avail_in = len - 10; |
bc22c17e AK |
104 | /* skip over asciz filename */ |
105 | if (zbuf[3] & 0x8) { | |
1da914e0 LC |
106 | do { |
107 | /* | |
108 | * If the filename doesn't fit into the buffer, | |
109 | * the file is very probably corrupt. Don't try | |
110 | * to read more data. | |
111 | */ | |
112 | if (strm->avail_in == 0) { | |
113 | error("header error"); | |
114 | goto gunzip_5; | |
115 | } | |
116 | --strm->avail_in; | |
117 | } while (*strm->next_in++); | |
bc22c17e | 118 | } |
bc22c17e AK |
119 | |
120 | strm->next_out = out_buf; | |
121 | strm->avail_out = out_len; | |
122 | ||
123 | rc = zlib_inflateInit2(strm, -MAX_WBITS); | |
124 | ||
125 | if (!flush) { | |
126 | WS(strm)->inflate_state.wsize = 0; | |
127 | WS(strm)->inflate_state.window = NULL; | |
128 | } | |
129 | ||
130 | while (rc == Z_OK) { | |
131 | if (strm->avail_in == 0) { | |
132 | /* TODO: handle case where both pos and fill are set */ | |
daeb6b6f | 133 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
bc22c17e AK |
134 | if (len < 0) { |
135 | rc = -1; | |
136 | error("read error"); | |
137 | break; | |
138 | } | |
139 | strm->next_in = zbuf; | |
140 | strm->avail_in = len; | |
141 | } | |
142 | rc = zlib_inflate(strm, 0); | |
143 | ||
144 | /* Write any data generated */ | |
145 | if (flush && strm->next_out > out_buf) { | |
d97b07c5 | 146 | long l = strm->next_out - out_buf; |
bc22c17e AK |
147 | if (l != flush(out_buf, l)) { |
148 | rc = -1; | |
149 | error("write error"); | |
150 | break; | |
151 | } | |
152 | strm->next_out = out_buf; | |
153 | strm->avail_out = out_len; | |
154 | } | |
155 | ||
156 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ | |
157 | if (rc == Z_STREAM_END) { | |
158 | rc = 0; | |
159 | break; | |
160 | } else if (rc != Z_OK) { | |
161 | error("uncompression error"); | |
162 | rc = -1; | |
163 | } | |
164 | } | |
165 | ||
166 | zlib_inflateEnd(strm); | |
167 | if (pos) | |
168 | /* add + 8 to skip over trailer */ | |
169 | *pos = strm->next_in - zbuf+8; | |
170 | ||
171 | gunzip_5: | |
172 | free(strm->workspace); | |
173 | gunzip_nomem4: | |
174 | free(strm); | |
175 | gunzip_nomem3: | |
176 | if (!buf) | |
177 | free(zbuf); | |
178 | gunzip_nomem2: | |
179 | if (flush) | |
180 | free(out_buf); | |
181 | gunzip_nomem1: | |
182 | return rc; /* returns Z_OK (0) if successful */ | |
183 | } | |
184 | ||
2d3862d2 YL |
185 | #ifndef PREBOOT |
186 | STATIC int INIT gunzip(unsigned char *buf, long len, | |
187 | long (*fill)(void*, unsigned long), | |
188 | long (*flush)(void*, unsigned long), | |
189 | unsigned char *out_buf, | |
190 | long *pos, | |
191 | void (*error)(char *x)) | |
192 | { | |
193 | return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error); | |
194 | } | |
195 | #else | |
196 | STATIC int INIT __decompress(unsigned char *buf, long len, | |
197 | long (*fill)(void*, unsigned long), | |
198 | long (*flush)(void*, unsigned long), | |
199 | unsigned char *out_buf, long out_len, | |
200 | long *pos, | |
201 | void (*error)(char *x)) | |
202 | { | |
203 | return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error); | |
204 | } | |
205 | #endif |