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"
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>
26 #include <linux/decompress/mm.h>
28 #define GZIP_IOBUF_SIZE (16*1024)
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,
36 void(*error_fn)(char *x)) {
38 struct z_stream_s *strm;
42 set_error_fn(error_fn);
45 out_len = 0x8000; /* 32 K */
46 out_buf = malloc(out_len);
48 out_len = 0x7fffffff; /* no limit */
51 error("Out of memory while allocating output buffer");
58 zbuf = malloc(GZIP_IOBUF_SIZE);
62 error("Out of memory while allocating input buffer");
66 strm = malloc(sizeof(*strm));
68 error("Out of memory while allocating z_stream");
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");
80 len = fill(zbuf, GZIP_IOBUF_SIZE);
82 /* verify the gzip header */
84 zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
87 error("Not a gzip file");
91 /* skip over gzip header (1f,8b,08... 10 bytes total +
92 * possible asciz filename)
94 strm->next_in = zbuf + 10;
95 /* skip over asciz filename */
97 while (strm->next_in[0])
101 strm->avail_in = len - (strm->next_in - zbuf);
103 strm->next_out = out_buf;
104 strm->avail_out = out_len;
106 rc = zlib_inflateInit2(strm, -MAX_WBITS);
109 WS(strm)->inflate_state.wsize = 0;
110 WS(strm)->inflate_state.window = NULL;
114 if (strm->avail_in == 0) {
115 /* TODO: handle case where both pos and fill are set */
116 len = fill(zbuf, GZIP_IOBUF_SIZE);
122 strm->next_in = zbuf;
123 strm->avail_in = len;
125 rc = zlib_inflate(strm, 0);
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)) {
132 error("write error");
135 strm->next_out = out_buf;
136 strm->avail_out = out_len;
139 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
140 if (rc == Z_STREAM_END) {
143 } else if (rc != Z_OK) {
144 error("uncompression error");
149 zlib_inflateEnd(strm);
151 /* add + 8 to skip over trailer */
152 *pos = strm->next_in - zbuf+8;
155 free(strm->workspace);
165 return rc; /* returns Z_OK (0) if successful */
168 #define decompress gunzip