1#ifdef STATIC
2
3
4
5
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
13
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
24
25#include <linux/decompress/mm.h>
26
27#define GZIP_IOBUF_SIZE (16*1024)
28
29static int INIT nofill(void *buffer, unsigned int len)
30{
31 return -1;
32}
33
34
35STATIC 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;
49 out_buf = malloc(out_len);
50 } else {
51 out_len = 0x7fffffff;
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
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
98
99
100 strm->next_in = zbuf + 10;
101 strm->avail_in = len - 10;
102
103 if (zbuf[3] & 0x8) {
104 do {
105
106
107
108
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
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
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
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
167 *pos = strm->next_in - zbuf+8;
168
169gunzip_5:
170 free(strm->workspace);
171gunzip_nomem4:
172 free(strm);
173gunzip_nomem3:
174 if (!buf)
175 free(zbuf);
176gunzip_nomem2:
177 if (flush)
178 free(out_buf);
179gunzip_nomem1:
180 return rc;
181}
182
183#define decompress gunzip
184