via-pmu: Add compat_pmu_ioctl
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / lib / decompress_inflate.c
blobfc686c7a0a0da688dd9dee52156dc7f6c0c380ab
1 #ifdef STATIC
2 /* Pre-boot environment: included */
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
8 #include "zlib_inflate/inftrees.c"
9 #include "zlib_inflate/inffast.c"
10 #include "zlib_inflate/inflate.c"
12 #else /* STATIC */
13 /* initramfs et al: linked */
15 #include <linux/zutil.h>
17 #include "zlib_inflate/inftrees.h"
18 #include "zlib_inflate/inffast.h"
19 #include "zlib_inflate/inflate.h"
21 #include "zlib_inflate/infutil.h"
22 #include <linux/slab.h>
24 #endif /* STATIC */
26 #include <linux/decompress/mm.h>
28 #define GZIP_IOBUF_SIZE (16*1024)
30 static int nofill(void *buffer, unsigned int len)
32 return -1;
35 /* Included from initramfs et al code */
36 STATIC int INIT gunzip(unsigned char *buf, int len,
37 int(*fill)(void*, unsigned int),
38 int(*flush)(void*, unsigned int),
39 unsigned char *out_buf,
40 int *pos,
41 void(*error_fn)(char *x)) {
42 u8 *zbuf;
43 struct z_stream_s *strm;
44 int rc;
45 size_t out_len;
47 set_error_fn(error_fn);
48 rc = -1;
49 if (flush) {
50 out_len = 0x8000; /* 32 K */
51 out_buf = malloc(out_len);
52 } else {
53 out_len = 0x7fffffff; /* no limit */
55 if (!out_buf) {
56 error("Out of memory while allocating output buffer");
57 goto gunzip_nomem1;
60 if (buf)
61 zbuf = buf;
62 else {
63 zbuf = malloc(GZIP_IOBUF_SIZE);
64 len = 0;
66 if (!zbuf) {
67 error("Out of memory while allocating input buffer");
68 goto gunzip_nomem2;
71 strm = malloc(sizeof(*strm));
72 if (strm == NULL) {
73 error("Out of memory while allocating z_stream");
74 goto gunzip_nomem3;
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;
84 if (!fill)
85 fill = nofill;
87 if (len == 0)
88 len = fill(zbuf, GZIP_IOBUF_SIZE);
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;
99 /* skip over gzip header (1f,8b,08... 10 bytes total +
100 * possible asciz filename)
102 strm->next_in = zbuf + 10;
103 /* skip over asciz filename */
104 if (zbuf[3] & 0x8) {
105 while (strm->next_in[0])
106 strm->next_in++;
107 strm->next_in++;
109 strm->avail_in = len - (strm->next_in - zbuf);
111 strm->next_out = out_buf;
112 strm->avail_out = out_len;
114 rc = zlib_inflateInit2(strm, -MAX_WBITS);
116 if (!flush) {
117 WS(strm)->inflate_state.wsize = 0;
118 WS(strm)->inflate_state.window = NULL;
121 while (rc == Z_OK) {
122 if (strm->avail_in == 0) {
123 /* TODO: handle case where both pos and fill are set */
124 len = fill(zbuf, GZIP_IOBUF_SIZE);
125 if (len < 0) {
126 rc = -1;
127 error("read error");
128 break;
130 strm->next_in = zbuf;
131 strm->avail_in = len;
133 rc = zlib_inflate(strm, 0);
135 /* Write any data generated */
136 if (flush && strm->next_out > out_buf) {
137 int l = strm->next_out - out_buf;
138 if (l != flush(out_buf, l)) {
139 rc = -1;
140 error("write error");
141 break;
143 strm->next_out = out_buf;
144 strm->avail_out = out_len;
147 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
148 if (rc == Z_STREAM_END) {
149 rc = 0;
150 break;
151 } else if (rc != Z_OK) {
152 error("uncompression error");
153 rc = -1;
157 zlib_inflateEnd(strm);
158 if (pos)
159 /* add + 8 to skip over trailer */
160 *pos = strm->next_in - zbuf+8;
162 gunzip_5:
163 free(strm->workspace);
164 gunzip_nomem4:
165 free(strm);
166 gunzip_nomem3:
167 if (!buf)
168 free(zbuf);
169 gunzip_nomem2:
170 if (flush)
171 free(out_buf);
172 gunzip_nomem1:
173 return rc; /* returns Z_OK (0) if successful */
176 #define decompress gunzip