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/*-
* 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 "test.h"
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/*
* Read an archive from a block of memory.
*
* This is identical to archive_read_open_memory(), except
* that it goes out of its way to be a little bit unpleasant,
* in order to better test the libarchive internals.
*/
struct read_memory_data {
unsigned char *buffer;
unsigned char *end;
size_t read_size;
size_t copy_buff_size;
char *copy_buff;
};
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
read_open_memory(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;
mine->copy_buff_size = read_size + 64;
mine->copy_buff = malloc(mine->copy_buff_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);
}
/*
* In order to exercise libarchive's internal read-combining logic,
* we deliberately copy data for each read to a separate buffer.
* That way, code that runs off the end of the provided data
* will screw up.
*/
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 */
size = mine->end - mine->buffer;
if (size > mine->read_size)
size = mine->read_size;
memset(mine->copy_buff, 0xA5, mine->copy_buff_size);
memcpy(mine->copy_buff, mine->buffer, size);
*buff = mine->copy_buff;
mine->buffer += size;
return (size);
}
/*
* How mean can a skip() routine be? Let's try to find out.
*/
#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 */
/* We can't skip by more than is available. */
if ((off_t)skip > (off_t)(mine->end - mine->buffer))
skip = mine->end - mine->buffer;
/* Always do small skips by prime amounts. */
if (skip > 71)
skip = 71;
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->copy_buff);
free(mine);
return (ARCHIVE_OK);
}
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