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Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
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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 | |
27 | #define GZIP_IOBUF_SIZE (16*1024) |
28 | |
29 | static int INIT nofill(void *buffer, unsigned int len) |
30 | { |
31 | return -1; |
32 | } |
33 | |
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, |
40 | void(*error)(char *x)) { |
41 | u8 *zbuf; |
42 | struct z_stream_s *strm; |
43 | int rc; |
44 | size_t out_len; |
45 | |
46 | rc = -1; |
47 | if (flush) { |
48 | out_len = 0x8000; /* 32 K */ |
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 { |
61 | zbuf = malloc(GZIP_IOBUF_SIZE); |
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 | |
82 | if (!fill) |
83 | fill = nofill; |
84 | |
85 | if (len == 0) |
86 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
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 | strm->avail_in = len - 10; |
102 | /* skip over asciz filename */ |
103 | if (zbuf[3] & 0x8) { |
104 | do { |
105 | /* |
106 | * If the filename doesn't fit into the buffer, |
107 | * the file is very probably corrupt. Don't try |
108 | * to read more data. |
109 | */ |
110 | if (strm->avail_in == 0) { |
111 | error("header error"); |
112 | goto gunzip_5; |
113 | } |
114 | --strm->avail_in; |
115 | } while (*strm->next_in++); |
116 | } |
117 | |
118 | strm->next_out = out_buf; |
119 | strm->avail_out = out_len; |
120 | |
121 | rc = zlib_inflateInit2(strm, -MAX_WBITS); |
122 | |
123 | if (!flush) { |
124 | WS(strm)->inflate_state.wsize = 0; |
125 | WS(strm)->inflate_state.window = NULL; |
126 | } |
127 | |
128 | while (rc == Z_OK) { |
129 | if (strm->avail_in == 0) { |
130 | /* TODO: handle case where both pos and fill are set */ |
131 | len = fill(zbuf, GZIP_IOBUF_SIZE); |
132 | if (len < 0) { |
133 | rc = -1; |
134 | error("read error"); |
135 | break; |
136 | } |
137 | strm->next_in = zbuf; |
138 | strm->avail_in = len; |
139 | } |
140 | rc = zlib_inflate(strm, 0); |
141 | |
142 | /* Write any data generated */ |
143 | if (flush && strm->next_out > out_buf) { |
144 | int l = strm->next_out - out_buf; |
145 | if (l != flush(out_buf, l)) { |
146 | rc = -1; |
147 | error("write error"); |
148 | break; |
149 | } |
150 | strm->next_out = out_buf; |
151 | strm->avail_out = out_len; |
152 | } |
153 | |
154 | /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */ |
155 | if (rc == Z_STREAM_END) { |
156 | rc = 0; |
157 | break; |
158 | } else if (rc != Z_OK) { |
159 | error("uncompression error"); |
160 | rc = -1; |
161 | } |
162 | } |
163 | |
164 | zlib_inflateEnd(strm); |
165 | if (pos) |
166 | /* add + 8 to skip over trailer */ |
167 | *pos = strm->next_in - zbuf+8; |
168 | |
169 | gunzip_5: |
170 | free(strm->workspace); |
171 | gunzip_nomem4: |
172 | free(strm); |
173 | gunzip_nomem3: |
174 | if (!buf) |
175 | free(zbuf); |
176 | gunzip_nomem2: |
177 | if (flush) |
178 | free(out_buf); |
179 | gunzip_nomem1: |
180 | return rc; /* returns Z_OK (0) if successful */ |
181 | } |
182 | |
183 | #define decompress gunzip |
184 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9