freebsd-dev/lib/libarchive/archive_write.c
2009-12-28 03:03:00 +00:00

467 lines
13 KiB
C

/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
/*
* This file contains the "essential" portions of the write API, that
* is, stuff that will essentially always be used by any client that
* actually needs to write a archive. Optional pieces have been, as
* far as possible, separated out into separate files to reduce
* needlessly bloating statically-linked clients.
*/
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_private.h"
static struct archive_vtable *archive_write_vtable(void);
static int _archive_write_close(struct archive *);
static int _archive_write_finish(struct archive *);
static int _archive_write_header(struct archive *, struct archive_entry *);
static int _archive_write_finish_entry(struct archive *);
static ssize_t _archive_write_data(struct archive *, const void *, size_t);
static struct archive_vtable *
archive_write_vtable(void)
{
static struct archive_vtable av;
static int inited = 0;
if (!inited) {
av.archive_close = _archive_write_close;
av.archive_finish = _archive_write_finish;
av.archive_write_header = _archive_write_header;
av.archive_write_finish_entry = _archive_write_finish_entry;
av.archive_write_data = _archive_write_data;
}
return (&av);
}
/*
* Allocate, initialize and return an archive object.
*/
struct archive *
archive_write_new(void)
{
struct archive_write *a;
unsigned char *nulls;
a = (struct archive_write *)malloc(sizeof(*a));
if (a == NULL)
return (NULL);
memset(a, 0, sizeof(*a));
a->archive.magic = ARCHIVE_WRITE_MAGIC;
a->archive.state = ARCHIVE_STATE_NEW;
a->archive.vtable = archive_write_vtable();
/*
* The value 10240 here matches the traditional tar default,
* but is otherwise arbitrary.
* TODO: Set the default block size from the format selected.
*/
a->bytes_per_block = 10240;
a->bytes_in_last_block = -1; /* Default */
/* Initialize a block of nulls for padding purposes. */
a->null_length = 1024;
nulls = (unsigned char *)malloc(a->null_length);
if (nulls == NULL) {
free(a);
return (NULL);
}
memset(nulls, 0, a->null_length);
a->nulls = nulls;
/*
* Set default compression, but don't set a default format.
* Were we to set a default format here, we would force every
* client to link in support for that format, even if they didn't
* ever use it.
*/
archive_write_set_compression_none(&a->archive);
return (&a->archive);
}
/*
* Set write options for the format. Returns 0 if successful.
*/
int
archive_write_set_format_options(struct archive *_a, const char *s)
{
struct archive_write *a = (struct archive_write *)_a;
char key[64], val[64];
int len, r, ret = ARCHIVE_OK;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_format_options");
archive_clear_error(&a->archive);
if (s == NULL || *s == '\0')
return (ARCHIVE_OK);
if (a->format_options == NULL)
/* This format does not support option. */
return (ARCHIVE_OK);
while ((len = __archive_parse_options(s, a->format_name,
sizeof(key), key, sizeof(val), val)) > 0) {
if (val[0] == '\0')
r = a->format_options(a, key, NULL);
else
r = a->format_options(a, key, val);
if (r == ARCHIVE_FATAL)
return (r);
if (r < ARCHIVE_OK) { /* This key was not handled. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Unsupported option ``%s''", key);
ret = ARCHIVE_WARN;
}
s += len;
}
if (len < 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Malformed options string.");
return (ARCHIVE_WARN);
}
return (ret);
}
/*
* Set write options for the compressor. Returns 0 if successful.
*/
int
archive_write_set_compressor_options(struct archive *_a, const char *s)
{
struct archive_write *a = (struct archive_write *)_a;
char key[64], val[64];
int len, r;
int ret = ARCHIVE_OK;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_compressor_options");
archive_clear_error(&a->archive);
if (s == NULL || *s == '\0')
return (ARCHIVE_OK);
if (a->compressor.options == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Unsupported option ``%s''", s);
/* This compressor does not support option. */
return (ARCHIVE_WARN);
}
while ((len = __archive_parse_options(s, a->archive.compression_name,
sizeof(key), key, sizeof(val), val)) > 0) {
if (val[0] == '\0')
r = a->compressor.options(a, key, NULL);
else
r = a->compressor.options(a, key, val);
if (r == ARCHIVE_FATAL)
return (r);
if (r < ARCHIVE_OK) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Unsupported option ``%s''", key);
ret = ARCHIVE_WARN;
}
s += len;
}
if (len < 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Illegal format options.");
return (ARCHIVE_WARN);
}
return (ret);
}
/*
* Set write options for the format and the compressor. Returns 0 if successful.
*/
int
archive_write_set_options(struct archive *_a, const char *s)
{
int r1, r2;
r1 = archive_write_set_format_options(_a, s);
if (r1 < ARCHIVE_WARN)
return (r1);
r2 = archive_write_set_compressor_options(_a, s);
if (r2 < ARCHIVE_WARN)
return (r2);
if (r1 == ARCHIVE_WARN && r2 == ARCHIVE_WARN)
return (ARCHIVE_WARN);
return (ARCHIVE_OK);
}
/*
* Set the block size. Returns 0 if successful.
*/
int
archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
a->bytes_per_block = bytes_per_block;
return (ARCHIVE_OK);
}
/*
* Get the current block size. -1 if it has never been set.
*/
int
archive_write_get_bytes_per_block(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
return (a->bytes_per_block);
}
/*
* Set the size for the last block.
* Returns 0 if successful.
*/
int
archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
a->bytes_in_last_block = bytes;
return (ARCHIVE_OK);
}
/*
* Return the value set above. -1 indicates it has not been set.
*/
int
archive_write_get_bytes_in_last_block(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
return (a->bytes_in_last_block);
}
/*
* dev/ino of a file to be rejected. Used to prevent adding
* an archive to itself recursively.
*/
int
archive_write_set_skip_file(struct archive *_a, dev_t d, ino_t i)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
a->skip_file_dev = d;
a->skip_file_ino = i;
return (ARCHIVE_OK);
}
/*
* Open the archive using the current settings.
*/
int
archive_write_open(struct archive *_a, void *client_data,
archive_open_callback *opener, archive_write_callback *writer,
archive_close_callback *closer)
{
struct archive_write *a = (struct archive_write *)_a;
int ret;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_open");
archive_clear_error(&a->archive);
a->archive.state = ARCHIVE_STATE_HEADER;
a->client_data = client_data;
a->client_writer = writer;
a->client_opener = opener;
a->client_closer = closer;
ret = (a->compressor.init)(a);
if (a->format_init && ret == ARCHIVE_OK)
ret = (a->format_init)(a);
return (ret);
}
/*
* Close out the archive.
*
* Be careful: user might just call write_new and then write_finish.
* Don't assume we actually wrote anything or performed any non-trivial
* initialization.
*/
static int
_archive_write_close(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int r = ARCHIVE_OK, r1 = ARCHIVE_OK;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_close");
/* Finish the last entry. */
if (a->archive.state & ARCHIVE_STATE_DATA)
r = ((a->format_finish_entry)(a));
/* Finish off the archive. */
if (a->format_finish != NULL) {
r1 = (a->format_finish)(a);
if (r1 < r)
r = r1;
}
/* Release format resources. */
if (a->format_destroy != NULL) {
r1 = (a->format_destroy)(a);
if (r1 < r)
r = r1;
}
/* Finish the compression and close the stream. */
if (a->compressor.finish != NULL) {
r1 = (a->compressor.finish)(a);
if (r1 < r)
r = r1;
}
/* Close out the client stream. */
if (a->client_closer != NULL) {
r1 = (a->client_closer)(&a->archive, a->client_data);
if (r1 < r)
r = r1;
}
a->archive.state = ARCHIVE_STATE_CLOSED;
return (r);
}
/*
* Destroy the archive structure.
*/
static int
_archive_write_finish(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int r = ARCHIVE_OK;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_finish");
if (a->archive.state != ARCHIVE_STATE_CLOSED)
r = archive_write_close(&a->archive);
/* Release various dynamic buffers. */
free((void *)(uintptr_t)(const void *)a->nulls);
archive_string_free(&a->archive.error_string);
a->archive.magic = 0;
free(a);
return (r);
}
/*
* Write the appropriate header.
*/
static int
_archive_write_header(struct archive *_a, struct archive_entry *entry)
{
struct archive_write *a = (struct archive_write *)_a;
int ret, r2;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
archive_clear_error(&a->archive);
/* In particular, "retry" and "fatal" get returned immediately. */
ret = archive_write_finish_entry(&a->archive);
if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
return (ret);
if (a->skip_file_dev != 0 &&
archive_entry_dev(entry) == a->skip_file_dev &&
a->skip_file_ino != 0 &&
archive_entry_ino64(entry) == a->skip_file_ino) {
archive_set_error(&a->archive, 0,
"Can't add archive to itself");
return (ARCHIVE_FAILED);
}
/* Format and write header. */
r2 = ((a->format_write_header)(a, entry));
if (r2 < ret)
ret = r2;
a->archive.state = ARCHIVE_STATE_DATA;
return (ret);
}
static int
_archive_write_finish_entry(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int ret = ARCHIVE_OK;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_finish_entry");
if (a->archive.state & ARCHIVE_STATE_DATA)
ret = (a->format_finish_entry)(a);
a->archive.state = ARCHIVE_STATE_HEADER;
return (ret);
}
/*
* Note that the compressor is responsible for blocking.
*/
static ssize_t
_archive_write_data(struct archive *_a, const void *buff, size_t s)
{
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_DATA, "archive_write_data");
archive_clear_error(&a->archive);
return ((a->format_write_data)(a, buff, s));
}