contrib/libarchive-2/libarchive/archive_write.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.c,v 1.27 2008/03/14 23:09:02 kientzle Exp $");
  28
  29 /*
  30  * This file contains the "essential" portions of the write API, that
  31  * is, stuff that will essentially always be used by any client that
  32  * actually needs to write a archive.  Optional pieces have been, as
  33  * far as possible, separated out into separate files to reduce
  34  * needlessly bloating statically-linked clients.
  35  */
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40 #ifdef HAVE_LIMITS_H
  41 #include <limits.h>
  42 #endif
  43 #include <stdio.h>
  44 #ifdef HAVE_STDLIB_H
  45 #include <stdlib.h>
  46 #endif
  47 #ifdef HAVE_STRING_H
  48 #include <string.h>
  49 #endif
  50 #include <time.h>
  51 #ifdef HAVE_UNISTD_H
  52 #include <unistd.h>
  53 #endif
  54
  55 #include "archive.h"
  56 #include "archive_entry.h"
  57 #include "archive_private.h"
  58 #include "archive_write_private.h"
  59
  60 static struct archive_vtable *archive_write_vtable(void);
  61
  62 static int      _archive_write_close(struct archive *);
  63 static int      _archive_write_finish(struct archive *);
  64 static int      _archive_write_header(struct archive *, struct archive_entry *);
  65 static int      _archive_write_finish_entry(struct archive *);
  66 static ssize_t  _archive_write_data(struct archive *, const void *, size_t);
  67
  68 static struct archive_vtable *
  69 archive_write_vtable(void)
  70 {
  71         static struct archive_vtable av;
  72         static int inited = 0;
  73
  74         if (!inited) {
  75                 av.archive_write_close = _archive_write_close;
  76                 av.archive_write_finish = _archive_write_finish;
  77                 av.archive_write_header = _archive_write_header;
  78                 av.archive_write_finish_entry = _archive_write_finish_entry;
  79                 av.archive_write_data = _archive_write_data;
  80         }
  81         return (&av);
  82 }
  83
  84 /*
  85  * Allocate, initialize and return an archive object.
  86  */
  87 struct archive *
  88 archive_write_new(void)
  89 {
  90         struct archive_write *a;
  91         unsigned char *nulls;
  92
  93         a = (struct archive_write *)malloc(sizeof(*a));
  94         if (a == NULL)
  95                 return (NULL);
  96         memset(a, 0, sizeof(*a));
  97         a->archive.magic = ARCHIVE_WRITE_MAGIC;
  98         a->archive.state = ARCHIVE_STATE_NEW;
  99         a->archive.vtable = archive_write_vtable();
 100         /*
 101          * The value 10240 here matches the traditional tar default,
 102          * but is otherwise arbitrary.
 103          * TODO: Set the default block size from the format selected.
 104          */
 105         a->bytes_per_block = 10240;
 106         a->bytes_in_last_block = -1;    /* Default */
 107
 108         /* Initialize a block of nulls for padding purposes. */
 109         a->null_length = 1024;
 110         nulls = (unsigned char *)malloc(a->null_length);
 111         if (nulls == NULL) {
 112                 free(a);
 113                 return (NULL);
 114         }
 115         memset(nulls, 0, a->null_length);
 116         a->nulls = nulls;
 117         /*
 118          * Set default compression, but don't set a default format.
 119          * Were we to set a default format here, we would force every
 120          * client to link in support for that format, even if they didn't
 121          * ever use it.
 122          */
 123         archive_write_set_compression_none(&a->archive);
 124         return (&a->archive);
 125 }
 126
 127 /*
 128  * Set the block size.  Returns 0 if successful.
 129  */
 130 int
 131 archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
 132 {
 133         struct archive_write *a = (struct archive_write *)_a;
 134         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 135             ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
 136         a->bytes_per_block = bytes_per_block;
 137         return (ARCHIVE_OK);
 138 }
 139
 140 /*
 141  * Get the current block size.  -1 if it has never been set.
 142  */
 143 int
 144 archive_write_get_bytes_per_block(struct archive *_a)
 145 {
 146         struct archive_write *a = (struct archive_write *)_a;
 147         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 148             ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
 149         return (a->bytes_per_block);
 150 }
 151
 152 /*
 153  * Set the size for the last block.
 154  * Returns 0 if successful.
 155  */
 156 int
 157 archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
 158 {
 159         struct archive_write *a = (struct archive_write *)_a;
 160         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 161             ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
 162         a->bytes_in_last_block = bytes;
 163         return (ARCHIVE_OK);
 164 }
 165
 166 /*
 167  * Return the value set above.  -1 indicates it has not been set.
 168  */
 169 int
 170 archive_write_get_bytes_in_last_block(struct archive *_a)
 171 {
 172         struct archive_write *a = (struct archive_write *)_a;
 173         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 174             ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
 175         return (a->bytes_in_last_block);
 176 }
 177
 178
 179 /*
 180  * dev/ino of a file to be rejected.  Used to prevent adding
 181  * an archive to itself recursively.
 182  */
 183 int
 184 archive_write_set_skip_file(struct archive *_a, dev_t d, ino_t i)
 185 {
 186         struct archive_write *a = (struct archive_write *)_a;
 187         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 188             ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
 189         a->skip_file_dev = d;
 190         a->skip_file_ino = i;
 191         return (ARCHIVE_OK);
 192 }
 193
 194
 195 /*
 196  * Open the archive using the current settings.
 197  */
 198 int
 199 archive_write_open(struct archive *_a, void *client_data,
 200     archive_open_callback *opener, archive_write_callback *writer,
 201     archive_close_callback *closer)
 202 {
 203         struct archive_write *a = (struct archive_write *)_a;
 204         int ret;
 205
 206         ret = ARCHIVE_OK;
 207         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 208             ARCHIVE_STATE_NEW, "archive_write_open");
 209         archive_clear_error(&a->archive);
 210         a->archive.state = ARCHIVE_STATE_HEADER;
 211         a->client_data = client_data;
 212         a->client_writer = writer;
 213         a->client_opener = opener;
 214         a->client_closer = closer;
 215         ret = (a->compressor.init)(a);
 216         if (a->format_init && ret == ARCHIVE_OK)
 217                 ret = (a->format_init)(a);
 218         return (ret);
 219 }
 220
 221
 222 /*
 223  * Close out the archive.
 224  *
 225  * Be careful: user might just call write_new and then write_finish.
 226  * Don't assume we actually wrote anything or performed any non-trivial
 227  * initialization.
 228  */
 229 static int
 230 _archive_write_close(struct archive *_a)
 231 {
 232         struct archive_write *a = (struct archive_write *)_a;
 233         int r = ARCHIVE_OK, r1 = ARCHIVE_OK;
 234
 235         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 236             ARCHIVE_STATE_ANY, "archive_write_close");
 237
 238         /* Finish the last entry. */
 239         if (a->archive.state & ARCHIVE_STATE_DATA)
 240                 r = ((a->format_finish_entry)(a));
 241
 242         /* Finish off the archive. */
 243         if (a->format_finish != NULL) {
 244                 r1 = (a->format_finish)(a);
 245                 if (r1 < r)
 246                         r = r1;
 247         }
 248
 249         /* Release format resources. */
 250         if (a->format_destroy != NULL) {
 251                 r1 = (a->format_destroy)(a);
 252                 if (r1 < r)
 253                         r = r1;
 254         }
 255
 256         /* Finish the compression and close the stream. */
 257         if (a->compressor.finish != NULL) {
 258                 r1 = (a->compressor.finish)(a);
 259                 if (r1 < r)
 260                         r = r1;
 261         }
 262
 263         /* Close out the client stream. */
 264         if (a->client_closer != NULL) {
 265                 r1 = (a->client_closer)(&a->archive, a->client_data);
 266                 if (r1 < r)
 267                         r = r1;
 268         }
 269
 270         a->archive.state = ARCHIVE_STATE_CLOSED;
 271         return (r);
 272 }
 273
 274 /*
 275  * Destroy the archive structure.
 276  */
 277 static int
 278 _archive_write_finish(struct archive *_a)
 279 {
 280         struct archive_write *a = (struct archive_write *)_a;
 281         int r = ARCHIVE_OK;
 282
 283         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 284             ARCHIVE_STATE_ANY, "archive_write_finish");
 285         if (a->archive.state != ARCHIVE_STATE_CLOSED)
 286                 r = archive_write_close(&a->archive);
 287
 288         /* Release various dynamic buffers. */
 289         free((void *)(uintptr_t)(const void *)a->nulls);
 290         archive_string_free(&a->archive.error_string);
 291         a->archive.magic = 0;
 292         free(a);
 293         return (r);
 294 }
 295
 296 /*
 297  * Write the appropriate header.
 298  */
 299 static int
 300 _archive_write_header(struct archive *_a, struct archive_entry *entry)
 301 {
 302         struct archive_write *a = (struct archive_write *)_a;
 303         int ret, r2;
 304
 305         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 306             ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
 307         archive_clear_error(&a->archive);
 308
 309         /* In particular, "retry" and "fatal" get returned immediately. */
 310         ret = archive_write_finish_entry(&a->archive);
 311         if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
 312                 return (ret);
 313
 314         if (a->skip_file_dev != 0 &&
 315             archive_entry_dev(entry) == a->skip_file_dev &&
 316             a->skip_file_ino != 0 &&
 317             archive_entry_ino(entry) == a->skip_file_ino) {
 318                 archive_set_error(&a->archive, 0,
 319                     "Can't add archive to itself");
 320                 return (ARCHIVE_FAILED);
 321         }
 322
 323         /* Format and write header. */
 324         r2 = ((a->format_write_header)(a, entry));
 325         if (r2 < ret)
 326                 ret = r2;
 327
 328         a->archive.state = ARCHIVE_STATE_DATA;
 329         return (ret);
 330 }
 331
 332 static int
 333 _archive_write_finish_entry(struct archive *_a)
 334 {
 335         struct archive_write *a = (struct archive_write *)_a;
 336         int ret = ARCHIVE_OK;
 337
 338         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 339             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
 340             "archive_write_finish_entry");
 341         if (a->archive.state & ARCHIVE_STATE_DATA)
 342                 ret = (a->format_finish_entry)(a);
 343         a->archive.state = ARCHIVE_STATE_HEADER;
 344         return (ret);
 345 }
 346
 347 /*
 348  * Note that the compressor is responsible for blocking.
 349  */
 350 static ssize_t
 351 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 352 {
 353         struct archive_write *a = (struct archive_write *)_a;
 354         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 355             ARCHIVE_STATE_DATA, "archive_write_data");
 356         archive_clear_error(&a->archive);
 357         return ((a->format_write_data)(a, buff, s));
 358 }