8f8c5c9773
of libarchive being used. I've been taking advantage of this with a recent round of updates to libarchive_test so that it can test older and newer versions of the library. Approved by: re (Ken Smith)
157 lines
4.7 KiB
C
157 lines
4.7 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("$FreeBSD$");
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "archive.h"
|
|
|
|
/*
|
|
* Glue to read an archive from a block of memory.
|
|
*
|
|
* This is mostly a huge help in building test harnesses;
|
|
* test programs can build archives in memory and read them
|
|
* back again without having to mess with files on disk.
|
|
*/
|
|
|
|
struct read_memory_data {
|
|
unsigned char *buffer;
|
|
unsigned char *end;
|
|
ssize_t read_size;
|
|
};
|
|
|
|
static int memory_read_close(struct archive *, void *);
|
|
static int memory_read_open(struct archive *, void *);
|
|
#if ARCHIVE_API_VERSION < 2
|
|
static ssize_t memory_read_skip(struct archive *, void *, size_t request);
|
|
#else
|
|
static off_t memory_read_skip(struct archive *, void *, off_t request);
|
|
#endif
|
|
static ssize_t memory_read(struct archive *, void *, const void **buff);
|
|
|
|
int
|
|
archive_read_open_memory(struct archive *a, void *buff, size_t size)
|
|
{
|
|
return archive_read_open_memory2(a, buff, size, size);
|
|
}
|
|
|
|
/*
|
|
* Don't use _open_memory2() in production code; the archive_read_open_memory()
|
|
* version is the one you really want. This is just here so that
|
|
* test harnesses can exercise block operations inside the library.
|
|
*/
|
|
int
|
|
archive_read_open_memory2(struct archive *a, void *buff,
|
|
size_t size, size_t read_size)
|
|
{
|
|
struct read_memory_data *mine;
|
|
|
|
mine = (struct read_memory_data *)malloc(sizeof(*mine));
|
|
if (mine == NULL) {
|
|
archive_set_error(a, ENOMEM, "No memory");
|
|
return (ARCHIVE_FATAL);
|
|
}
|
|
memset(mine, 0, sizeof(*mine));
|
|
mine->buffer = (unsigned char *)buff;
|
|
mine->end = mine->buffer + size;
|
|
mine->read_size = read_size;
|
|
return (archive_read_open2(a, mine, memory_read_open,
|
|
memory_read, memory_read_skip, memory_read_close));
|
|
}
|
|
|
|
/*
|
|
* There's nothing to open.
|
|
*/
|
|
static int
|
|
memory_read_open(struct archive *a, void *client_data)
|
|
{
|
|
(void)a; /* UNUSED */
|
|
(void)client_data; /* UNUSED */
|
|
return (ARCHIVE_OK);
|
|
}
|
|
|
|
/*
|
|
* This is scary simple: Just advance a pointer. Limiting
|
|
* to read_size is not technically necessary, but it exercises
|
|
* more of the internal logic when used with a small block size
|
|
* in a test harness. Production use should not specify a block
|
|
* size; then this is much faster.
|
|
*/
|
|
static ssize_t
|
|
memory_read(struct archive *a, void *client_data, const void **buff)
|
|
{
|
|
struct read_memory_data *mine = (struct read_memory_data *)client_data;
|
|
ssize_t size;
|
|
|
|
(void)a; /* UNUSED */
|
|
*buff = mine->buffer;
|
|
size = mine->end - mine->buffer;
|
|
if (size > mine->read_size)
|
|
size = mine->read_size;
|
|
mine->buffer += size;
|
|
return (size);
|
|
}
|
|
|
|
/*
|
|
* Advancing is just as simple. Again, this is doing more than
|
|
* necessary in order to better exercise internal code when used
|
|
* as a test harness.
|
|
*/
|
|
#if ARCHIVE_API_VERSION < 2
|
|
static ssize_t
|
|
memory_read_skip(struct archive *a, void *client_data, size_t skip)
|
|
#else
|
|
static off_t
|
|
memory_read_skip(struct archive *a, void *client_data, off_t skip)
|
|
#endif
|
|
{
|
|
struct read_memory_data *mine = (struct read_memory_data *)client_data;
|
|
|
|
(void)a; /* UNUSED */
|
|
if ((off_t)skip > (off_t)(mine->end - mine->buffer))
|
|
skip = mine->end - mine->buffer;
|
|
/* Round down to block size. */
|
|
skip /= mine->read_size;
|
|
skip *= mine->read_size;
|
|
mine->buffer += skip;
|
|
return (skip);
|
|
}
|
|
|
|
/*
|
|
* Close is just cleaning up our one small bit of data.
|
|
*/
|
|
static int
|
|
memory_read_close(struct archive *a, void *client_data)
|
|
{
|
|
struct read_memory_data *mine = (struct read_memory_data *)client_data;
|
|
(void)a; /* UNUSED */
|
|
free(mine);
|
|
return (ARCHIVE_OK);
|
|
}
|