contrib/libarchive-2/libarchive/archive_write_set_format_cpio.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_format_cpio.c,v 1.14 2008/03/15 11:04:45 kientzle Exp $");
  28
  29 #ifdef HAVE_ERRNO_H
  30 #include <errno.h>
  31 #endif
  32 #include <stdio.h>
  33 #ifdef HAVE_STDLIB_H
  34 #include <stdlib.h>
  35 #endif
  36 #ifdef HAVE_STRING_H
  37 #include <string.h>
  38 #endif
  39
  40 #include "archive.h"
  41 #include "archive_entry.h"
  42 #include "archive_private.h"
  43 #include "archive_write_private.h"
  44
  45 static ssize_t  archive_write_cpio_data(struct archive_write *,
  46                     const void *buff, size_t s);
  47 static int      archive_write_cpio_finish(struct archive_write *);
  48 static int      archive_write_cpio_destroy(struct archive_write *);
  49 static int      archive_write_cpio_finish_entry(struct archive_write *);
  50 static int      archive_write_cpio_header(struct archive_write *,
  51                     struct archive_entry *);
  52 static int      format_octal(int64_t, void *, int);
  53 static int64_t  format_octal_recursive(int64_t, char *, int);
  54
  55 struct cpio {
  56         uint64_t          entry_bytes_remaining;
  57 };
  58
  59 struct cpio_header {
  60         char    c_magic[6];
  61         char    c_dev[6];
  62         char    c_ino[6];
  63         char    c_mode[6];
  64         char    c_uid[6];
  65         char    c_gid[6];
  66         char    c_nlink[6];
  67         char    c_rdev[6];
  68         char    c_mtime[11];
  69         char    c_namesize[6];
  70         char    c_filesize[11];
  71 };
  72
  73 /*
  74  * Set output format to 'cpio' format.
  75  */
  76 int
  77 archive_write_set_format_cpio(struct archive *_a)
  78 {
  79         struct archive_write *a = (struct archive_write *)_a;
  80         struct cpio *cpio;
  81
  82         /* If someone else was already registered, unregister them. */
  83         if (a->format_destroy != NULL)
  84                 (a->format_destroy)(a);
  85
  86         cpio = (struct cpio *)malloc(sizeof(*cpio));
  87         if (cpio == NULL) {
  88                 archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
  89                 return (ARCHIVE_FATAL);
  90         }
  91         memset(cpio, 0, sizeof(*cpio));
  92         a->format_data = cpio;
  93
  94         a->pad_uncompressed = 1;
  95         a->format_write_header = archive_write_cpio_header;
  96         a->format_write_data = archive_write_cpio_data;
  97         a->format_finish_entry = archive_write_cpio_finish_entry;
  98         a->format_finish = archive_write_cpio_finish;
  99         a->format_destroy = archive_write_cpio_destroy;
 100         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
 101         a->archive.archive_format_name = "POSIX cpio";
 102         return (ARCHIVE_OK);
 103 }
 104
 105 static int
 106 archive_write_cpio_header(struct archive_write *a, struct archive_entry *entry)
 107 {
 108         struct cpio *cpio;
 109         const char *p, *path;
 110         int pathlength, ret;
 111         struct cpio_header       h;
 112
 113         cpio = (struct cpio *)a->format_data;
 114         ret = 0;
 115
 116         path = archive_entry_pathname(entry);
 117         pathlength = strlen(path) + 1; /* Include trailing null. */
 118
 119         memset(&h, 0, sizeof(h));
 120         format_octal(070707, &h.c_magic, sizeof(h.c_magic));
 121         format_octal(archive_entry_dev(entry), &h.c_dev, sizeof(h.c_dev));
 122         /*
 123          * TODO: Generate artificial inode numbers rather than just
 124          * re-using the ones off the disk.  That way, the 18-bit c_ino
 125          * field only limits the number of files in the archive.
 126          */
 127         if (archive_entry_ino(entry) > 0777777) {
 128                 archive_set_error(&a->archive, ERANGE, "large inode number truncated");
 129                 ret = ARCHIVE_WARN;
 130         }
 131
 132         format_octal(archive_entry_ino(entry) & 0777777, &h.c_ino, sizeof(h.c_ino));
 133         format_octal(archive_entry_mode(entry), &h.c_mode, sizeof(h.c_mode));
 134         format_octal(archive_entry_uid(entry), &h.c_uid, sizeof(h.c_uid));
 135         format_octal(archive_entry_gid(entry), &h.c_gid, sizeof(h.c_gid));
 136         format_octal(archive_entry_nlink(entry), &h.c_nlink, sizeof(h.c_nlink));
 137         if (archive_entry_filetype(entry) == AE_IFBLK
 138             || archive_entry_filetype(entry) == AE_IFCHR)
 139             format_octal(archive_entry_dev(entry), &h.c_rdev, sizeof(h.c_rdev));
 140         else
 141             format_octal(0, &h.c_rdev, sizeof(h.c_rdev));
 142         format_octal(archive_entry_mtime(entry), &h.c_mtime, sizeof(h.c_mtime));
 143         format_octal(pathlength, &h.c_namesize, sizeof(h.c_namesize));
 144
 145         /* Non-regular files don't store bodies. */
 146         if (archive_entry_filetype(entry) != AE_IFREG)
 147                 archive_entry_set_size(entry, 0);
 148
 149         /* Symlinks get the link written as the body of the entry. */
 150         p = archive_entry_symlink(entry);
 151         if (p != NULL  &&  *p != '\0')
 152                 format_octal(strlen(p), &h.c_filesize, sizeof(h.c_filesize));
 153         else
 154                 format_octal(archive_entry_size(entry),
 155                     &h.c_filesize, sizeof(h.c_filesize));
 156
 157         ret = (a->compressor.write)(a, &h, sizeof(h));
 158         if (ret != ARCHIVE_OK)
 159                 return (ARCHIVE_FATAL);
 160
 161         ret = (a->compressor.write)(a, path, pathlength);
 162         if (ret != ARCHIVE_OK)
 163                 return (ARCHIVE_FATAL);
 164
 165         cpio->entry_bytes_remaining = archive_entry_size(entry);
 166
 167         /* Write the symlink now. */
 168         if (p != NULL  &&  *p != '\0')
 169                 ret = (a->compressor.write)(a, p, strlen(p));
 170
 171         return (ret);
 172 }
 173
 174 static ssize_t
 175 archive_write_cpio_data(struct archive_write *a, const void *buff, size_t s)
 176 {
 177         struct cpio *cpio;
 178         int ret;
 179
 180         cpio = (struct cpio *)a->format_data;
 181         if (s > cpio->entry_bytes_remaining)
 182                 s = cpio->entry_bytes_remaining;
 183
 184         ret = (a->compressor.write)(a, buff, s);
 185         cpio->entry_bytes_remaining -= s;
 186         if (ret >= 0)
 187                 return (s);
 188         else
 189                 return (ret);
 190 }
 191
 192 /*
 193  * Format a number into the specified field.
 194  */
 195 static int
 196 format_octal(int64_t v, void *p, int digits)
 197 {
 198         int64_t max;
 199         int     ret;
 200
 201         max = (((int64_t)1) << (digits * 3)) - 1;
 202         if (v >= 0  &&  v <= max) {
 203             format_octal_recursive(v, (char *)p, digits);
 204             ret = 0;
 205         } else {
 206             format_octal_recursive(max, (char *)p, digits);
 207             ret = -1;
 208         }
 209         return (ret);
 210 }
 211
 212 static int64_t
 213 format_octal_recursive(int64_t v, char *p, int s)
 214 {
 215         if (s == 0)
 216                 return (v);
 217         v = format_octal_recursive(v, p+1, s-1);
 218         *p = '0' + (v & 7);
 219         return (v >>= 3);
 220 }
 221
 222 static int
 223 archive_write_cpio_finish(struct archive_write *a)
 224 {
 225         struct cpio *cpio;
 226         int er;
 227         struct archive_entry *trailer;
 228
 229         cpio = (struct cpio *)a->format_data;
 230         trailer = archive_entry_new();
 231         /* nlink = 1 here for GNU cpio compat. */
 232         archive_entry_set_nlink(trailer, 1);
 233         archive_entry_set_pathname(trailer, "TRAILER!!!");
 234         er = archive_write_cpio_header(a, trailer);
 235         archive_entry_free(trailer);
 236         return (er);
 237 }
 238
 239 static int
 240 archive_write_cpio_destroy(struct archive_write *a)
 241 {
 242         struct cpio *cpio;
 243
 244         cpio = (struct cpio *)a->format_data;
 245         free(cpio);
 246         a->format_data = NULL;
 247         return (ARCHIVE_OK);
 248 }
 249
 250 static int
 251 archive_write_cpio_finish_entry(struct archive_write *a)
 252 {
 253         struct cpio *cpio;
 254         int to_write, ret;
 255
 256         cpio = (struct cpio *)a->format_data;
 257         ret = ARCHIVE_OK;
 258         while (cpio->entry_bytes_remaining > 0) {
 259                 to_write = cpio->entry_bytes_remaining < a->null_length ?
 260                     cpio->entry_bytes_remaining : a->null_length;
 261                 ret = (a->compressor.write)(a, a->nulls, to_write);
 262                 if (ret != ARCHIVE_OK)
 263                         return (ret);
 264                 cpio->entry_bytes_remaining -= to_write;
 265         }
 266         return (ret);
 267 }