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 #include <linux/slab.h>
23
24 #endif /* STATIC */
25
26 #include <linux/decompress/mm.h>
27
28 #define GZIP_IOBUF_SIZE (16*1024)
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) {
45 out_len = 0x8000; /* 32 K */
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 {
58 zbuf = malloc(GZIP_IOBUF_SIZE);
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)
80 len = fill(zbuf, GZIP_IOBUF_SIZE);
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 }
101 strm->avail_in = len - (strm->next_in - zbuf);
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 */
116 len = fill(zbuf, GZIP_IOBUF_SIZE);
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
169
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