1 /*
2 * cpio.c
3 *
4 * Write a compressed CPIO file
5 */
6
7 #include <stdio.h>
8 #include <string.h>
9 #include <inttypes.h>
10 #include <stdbool.h>
11 #include <zlib.h>
12 #include "upload_backend.h"
13 #include "ctime.h"
14
cpio_pad(struct upload_backend * be)15 int cpio_pad(struct upload_backend *be)
16 {
17 static char pad[4]; /* Up to 4 zero bytes */
18 if (be->dbytes & 3)
19 return write_data(be, pad, -be->dbytes & 3);
20 else
21 return 0;
22 }
23
cpio_hdr(struct upload_backend * be,uint32_t mode,size_t datalen,const char * filename)24 int cpio_hdr(struct upload_backend *be, uint32_t mode, size_t datalen,
25 const char *filename)
26 {
27 static uint32_t inode = 2;
28 char hdr[6+13*8+1];
29 int nlen = strlen(filename)+1;
30 int rv = 0;
31
32 cpio_pad(be);
33
34 sprintf(hdr, "%06o%08x%08x%08x%08x%08x%08x%08zx%08x%08x%08x%08x%08x%08x",
35 070701, /* c_magic */
36 inode++, /* c_ino */
37 mode, /* c_mode */
38 0, /* c_uid */
39 0, /* c_gid */
40 1, /* c_nlink */
41 be->now, /* c_mtime */
42 datalen, /* c_filesize */
43 0, /* c_maj */
44 0, /* c_min */
45 0, /* c_rmaj */
46 0, /* c_rmin */
47 nlen, /* c_namesize */
48 0); /* c_chksum */
49 rv |= write_data(be, hdr, 6+13*8);
50 rv |= write_data(be, filename, nlen);
51 rv |= cpio_pad(be);
52 return rv;
53 }
54
cpio_mkdir(struct upload_backend * be,const char * filename)55 int cpio_mkdir(struct upload_backend *be, const char *filename)
56 {
57 return cpio_hdr(be, MODE_DIR, 0, filename);
58 }
59
cpio_writefile(struct upload_backend * be,const char * filename,const void * data,size_t len)60 int cpio_writefile(struct upload_backend *be, const char *filename,
61 const void *data, size_t len)
62 {
63 int rv;
64
65 rv = cpio_hdr(be, MODE_FILE, len, filename);
66 rv |= write_data(be, data, len);
67 rv |= cpio_pad(be);
68
69 return rv;
70 }
71
cpio_close(struct upload_backend * be)72 int cpio_close(struct upload_backend *be)
73 {
74 return cpio_hdr(be, 0, 0, "TRAILER!!!");
75 }
76