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"
25 #include <linux/decompress/mm.h>
27 #define INBUF_LEN (16*1024)
29 /* Included from initramfs et al code */
30 STATIC int INIT gunzip(unsigned char *buf, int len,
31 int(*fill)(void*, unsigned int),
32 int(*flush)(void*, unsigned int),
33 unsigned char *out_buf,
35 void(*error_fn)(char *x)) {
37 struct z_stream_s *strm;
41 set_error_fn(error_fn);
44 out_len = 0x8000; /* 32 K */
45 out_buf = malloc(out_len);
47 out_len = 0x7fffffff; /* no limit */
50 error("Out of memory while allocating output buffer");
57 zbuf = malloc(INBUF_LEN);
61 error("Out of memory while allocating input buffer");
65 strm = malloc(sizeof(*strm));
67 error("Out of memory while allocating z_stream");
71 strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
72 sizeof(struct inflate_state));
73 if (strm->workspace == NULL) {
74 error("Out of memory while allocating workspace");
79 len = fill(zbuf, INBUF_LEN);
81 /* verify the gzip header */
83 zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
86 error("Not a gzip file");
90 /* skip over gzip header (1f,8b,08... 10 bytes total +
91 * possible asciz filename)
93 strm->next_in = zbuf + 10;
94 /* skip over asciz filename */
96 while (strm->next_in[0])
100 strm->avail_in = len - (strm->next_in - zbuf);
102 strm->next_out = out_buf;
103 strm->avail_out = out_len;
105 rc = zlib_inflateInit2(strm, -MAX_WBITS);
108 WS(strm)->inflate_state.wsize = 0;
109 WS(strm)->inflate_state.window = NULL;
113 if (strm->avail_in == 0) {
114 /* TODO: handle case where both pos and fill are set */
115 len = fill(zbuf, INBUF_LEN);
121 strm->next_in = zbuf;
122 strm->avail_in = len;
124 rc = zlib_inflate(strm, 0);
126 /* Write any data generated */
127 if (flush && strm->next_out > out_buf) {
128 int l = strm->next_out - out_buf;
129 if (l != flush(out_buf, l)) {
131 error("write error");
134 strm->next_out = out_buf;
135 strm->avail_out = out_len;
138 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
139 if (rc == Z_STREAM_END) {
142 } else if (rc != Z_OK) {
143 error("uncompression error");
148 zlib_inflateEnd(strm);
150 /* add + 8 to skip over trailer */
151 *pos = strm->next_in - zbuf+8;
154 free(strm->workspace);
164 return rc; /* returns Z_OK (0) if successful */
167 #define decompress gunzip