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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #ifdef STATIC | |
3 | #define PREBOOT | |
4 | /* Pre-boot environment: included */ | |
5 | ||
6 | /* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots | |
7 | * errors about console_printk etc... on ARM */ | |
8 | #define _LINUX_KERNEL_H | |
9 | ||
10 | #include "zlib_inflate/inftrees.c" | |
11 | #include "zlib_inflate/inffast.c" | |
12 | #include "zlib_inflate/inflate.c" | |
13 | #ifdef CONFIG_ZLIB_DFLTCC | |
14 | #include "zlib_dfltcc/dfltcc.c" | |
15 | #include "zlib_dfltcc/dfltcc_inflate.c" | |
16 | #endif | |
17 | ||
18 | #else /* STATIC */ | |
19 | /* initramfs et al: linked */ | |
20 | ||
21 | #include <linux/zutil.h> | |
22 | ||
23 | #include "zlib_inflate/inftrees.h" | |
24 | #include "zlib_inflate/inffast.h" | |
25 | #include "zlib_inflate/inflate.h" | |
26 | ||
27 | #include "zlib_inflate/infutil.h" | |
28 | #include <linux/decompress/inflate.h> | |
29 | ||
30 | #endif /* STATIC */ | |
31 | ||
32 | #include <linux/decompress/mm.h> | |
33 | ||
34 | #define GZIP_IOBUF_SIZE (16*1024) | |
35 | ||
36 | static long INIT nofill(void *buffer, unsigned long len) | |
37 | { | |
38 | return -1; | |
39 | } | |
40 | ||
41 | /* Included from initramfs et al code */ | |
42 | STATIC int INIT __gunzip(unsigned char *buf, long len, | |
43 | long (*fill)(void*, unsigned long), | |
44 | long (*flush)(void*, unsigned long), | |
45 | unsigned char *out_buf, long out_len, | |
46 | long *pos, | |
47 | void(*error)(char *x)) { | |
48 | u8 *zbuf; | |
49 | struct z_stream_s *strm; | |
50 | int rc; | |
51 | ||
52 | rc = -1; | |
53 | if (flush) { | |
54 | out_len = 0x8000; /* 32 K */ | |
55 | out_buf = malloc(out_len); | |
56 | } else { | |
57 | if (!out_len) | |
58 | out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */ | |
59 | } | |
60 | if (!out_buf) { | |
61 | error("Out of memory while allocating output buffer"); | |
62 | goto gunzip_nomem1; | |
63 | } | |
64 | ||
65 | if (buf) | |
66 | zbuf = buf; | |
67 | else { | |
68 | zbuf = malloc(GZIP_IOBUF_SIZE); | |
69 | len = 0; | |
70 | } | |
71 | if (!zbuf) { | |
72 | error("Out of memory while allocating input buffer"); | |
73 | goto gunzip_nomem2; | |
74 | } | |
75 | ||
76 | strm = malloc(sizeof(*strm)); | |
77 | if (strm == NULL) { | |
78 | error("Out of memory while allocating z_stream"); | |
79 | goto gunzip_nomem3; | |
80 | } | |
81 | ||
82 | strm->workspace = malloc(flush ? zlib_inflate_workspacesize() : | |
83 | #ifdef CONFIG_ZLIB_DFLTCC | |
84 | /* Always allocate the full workspace for DFLTCC */ | |
85 | zlib_inflate_workspacesize()); | |
86 | #else | |
87 | sizeof(struct inflate_state)); | |
88 | #endif | |
89 | if (strm->workspace == NULL) { | |
90 | error("Out of memory while allocating workspace"); | |
91 | goto gunzip_nomem4; | |
92 | } | |
93 | ||
94 | if (!fill) | |
95 | fill = nofill; | |
96 | ||
97 | if (len == 0) | |
98 | len = fill(zbuf, GZIP_IOBUF_SIZE); | |
99 | ||
100 | /* verify the gzip header */ | |
101 | if (len < 10 || | |
102 | zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) { | |
103 | if (pos) | |
104 | *pos = 0; | |
105 | error("Not a gzip file"); | |
106 | goto gunzip_5; | |
107 | } | |
108 | ||
109 | /* skip over gzip header (1f,8b,08... 10 bytes total + | |
110 | * possible asciz filename) | |
111 | */ | |
112 | strm->next_in = zbuf + 10; | |
113 | strm->avail_in = len - 10; | |
114 | /* skip over asciz filename */ | |
115 | if (zbuf[3] & 0x8) { | |
116 | do { | |
117 | /* | |
118 | * If the filename doesn't fit into the buffer, | |
119 | * the file is very probably corrupt. Don't try | |
120 | * to read more data. | |
121 | */ | |
122 | if (strm->avail_in == 0) { | |
123 | error("header error"); | |
124 | goto gunzip_5; | |
125 | } | |
126 | --strm->avail_in; | |
127 | } while (*strm->next_in++); | |
128 | } | |
129 | ||
130 | strm->next_out = out_buf; | |
131 | strm->avail_out = out_len; | |
132 | ||
133 | rc = zlib_inflateInit2(strm, -MAX_WBITS); | |
134 | ||
135 | #ifdef CONFIG_ZLIB_DFLTCC | |
136 | /* Always keep the window for DFLTCC */ | |
137 | #else | |
138 | if (!flush) { | |
139 | WS(strm)->inflate_state.wsize = 0; | |
140 | WS(strm)->inflate_state.window = NULL; | |
141 | } | |
142 | #endif | |
143 | ||
144 | while (rc == Z_OK) { | |
145 | if (strm->avail_in == 0) { | |
146 | /* TODO: handle case where both pos and fill are set */ | |
147 | len = fill(zbuf, GZIP_IOBUF_SIZE); | |
148 | if (len < 0) { | |
149 | rc = -1; | |
150 | error("read error"); | |
151 | break; | |
152 | } | |
153 | strm->next_in = zbuf; | |
154 | strm->avail_in = len; | |
155 | } | |
156 | rc = zlib_inflate(strm, 0); | |
157 | ||
158 | /* Write any data generated */ | |
159 | if (flush && strm->next_out > out_buf) { | |
160 | long l = strm->next_out - out_buf; | |
161 | if (l != flush(out_buf, l)) { | |
162 | rc = -1; | |
163 | error("write error"); | |
164 | break; | |
165 | } | |
166 | strm->next_out = out_buf; | |
167 | strm->avail_out = out_len; | |
168 | } | |
169 | ||
170 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ | |
171 | if (rc == Z_STREAM_END) { | |
172 | rc = 0; | |
173 | break; | |
174 | } else if (rc != Z_OK) { | |
175 | error("uncompression error"); | |
176 | rc = -1; | |
177 | } | |
178 | } | |
179 | ||
180 | zlib_inflateEnd(strm); | |
181 | if (pos) | |
182 | /* add + 8 to skip over trailer */ | |
183 | *pos = strm->next_in - zbuf+8; | |
184 | ||
185 | gunzip_5: | |
186 | free(strm->workspace); | |
187 | gunzip_nomem4: | |
188 | free(strm); | |
189 | gunzip_nomem3: | |
190 | if (!buf) | |
191 | free(zbuf); | |
192 | gunzip_nomem2: | |
193 | if (flush) | |
194 | free(out_buf); | |
195 | gunzip_nomem1: | |
196 | return rc; /* returns Z_OK (0) if successful */ | |
197 | } | |
198 | ||
199 | #ifndef PREBOOT | |
200 | STATIC int INIT gunzip(unsigned char *buf, long len, | |
201 | long (*fill)(void*, unsigned long), | |
202 | long (*flush)(void*, unsigned long), | |
203 | unsigned char *out_buf, | |
204 | long *pos, | |
205 | void (*error)(char *x)) | |
206 | { | |
207 | return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error); | |
208 | } | |
209 | #else | |
210 | STATIC int INIT __decompress(unsigned char *buf, long len, | |
211 | long (*fill)(void*, unsigned long), | |
212 | long (*flush)(void*, unsigned long), | |
213 | unsigned char *out_buf, long out_len, | |
214 | long *pos, | |
215 | void (*error)(char *x)) | |
216 | { | |
217 | return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error); | |
218 | } | |
219 | #endif |