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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 "archive_platform.h"
__FBSDID("$FreeBSD: src/lib/libarchive/archive_write_open_memory.c,v 1.3 2007/01/09 08:05:56 kientzle Exp $");
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "archive.h"
struct write_memory_data {
size_t used;
size_t size;
size_t * client_size;
unsigned char * buff;
};
static int memory_write_close(struct archive *, void *);
static int memory_write_open(struct archive *, void *);
static ssize_t memory_write(struct archive *, void *, const void *buff, size_t);
/*
* Client provides a pointer to a block of memory to receive
* the data. The 'size' param both tells us the size of the
* client buffer and lets us tell the client the final size.
*/
int
archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)
{
struct write_memory_data *mine;
mine = (struct write_memory_data *)malloc(sizeof(*mine));
if (mine == NULL) {
archive_set_error(a, ENOMEM, "No memory");
return (ARCHIVE_FATAL);
}
memset(mine, 0, sizeof(*mine));
mine->buff = buff;
mine->size = buffSize;
mine->client_size = used;
return (archive_write_open(a, mine,
memory_write_open, memory_write, memory_write_close));
}
static int
memory_write_open(struct archive *a, void *client_data)
{
struct write_memory_data *mine;
mine = client_data;
mine->used = 0;
if (mine->client_size != NULL)
*mine->client_size = mine->used;
/* Disable padding if it hasn't been set explicitly. */
if (-1 == archive_write_get_bytes_in_last_block(a))
archive_write_set_bytes_in_last_block(a, 1);
return (ARCHIVE_OK);
}
/*
* Copy the data into the client buffer.
* Note that we update mine->client_size on every write.
* In particular, this means the client can follow exactly
* how much has been written into their buffer at any time.
*/
static ssize_t
memory_write(struct archive *a, void *client_data, const void *buff, size_t length)
{
struct write_memory_data *mine;
mine = client_data;
if (mine->used + length > mine->size) {
archive_set_error(a, ENOMEM, "Buffer exhausted");
return (ARCHIVE_FATAL);
}
memcpy(mine->buff + mine->used, buff, length);
mine->used += length;
if (mine->client_size != NULL)
*mine->client_size = mine->used;
return (length);
}
static int
memory_write_close(struct archive *a, void *client_data)
{
struct write_memory_data *mine;
(void)a; /* UNUSED */
mine = client_data;
free(mine);
return (ARCHIVE_OK);
}