com32/libupload/cpio.c

   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
  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
  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
  55 int cpio_mkdir(struct upload_backend *be, const char *filename)
  56 {
  57     return cpio_hdr(be, MODE_DIR, 0, filename);
  58 }
  59
  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
  72 int cpio_close(struct upload_backend *be)
  73 {
  74     return cpio_hdr(be, 0, 0, "TRAILER!!!");
  75 }