2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include "archive_platform.h"
27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_open_memory.c,v 1.3 2007/01/09 08:05:56 kientzle Exp $");
35 struct write_memory_data {
42 static int memory_write_close(struct archive *, void *);
43 static int memory_write_open(struct archive *, void *);
44 static ssize_t memory_write(struct archive *, void *, const void *buff, size_t);
47 * Client provides a pointer to a block of memory to receive
48 * the data. The 'size' param both tells us the size of the
49 * client buffer and lets us tell the client the final size.
52 archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)
54 struct write_memory_data *mine;
56 mine = (struct write_memory_data *)malloc(sizeof(*mine));
58 archive_set_error(a, ENOMEM, "No memory");
59 return (ARCHIVE_FATAL);
61 memset(mine, 0, sizeof(*mine));
63 mine->size = buffSize;
64 mine->client_size = used;
65 return (archive_write_open(a, mine,
66 memory_write_open, memory_write, memory_write_close));
70 memory_write_open(struct archive *a, void *client_data)
72 struct write_memory_data *mine;
75 if (mine->client_size != NULL)
76 *mine->client_size = mine->used;
77 /* Disable padding if it hasn't been set explicitly. */
78 if (-1 == archive_write_get_bytes_in_last_block(a))
79 archive_write_set_bytes_in_last_block(a, 1);
84 * Copy the data into the client buffer.
85 * Note that we update mine->client_size on every write.
86 * In particular, this means the client can follow exactly
87 * how much has been written into their buffer at any time.
90 memory_write(struct archive *a, void *client_data, const void *buff, size_t length)
92 struct write_memory_data *mine;
95 if (mine->used + length > mine->size) {
96 archive_set_error(a, ENOMEM, "Buffer exhausted");
97 return (ARCHIVE_FATAL);
99 memcpy(mine->buff + mine->used, buff, length);
100 mine->used += length;
101 if (mine->client_size != NULL)
102 *mine->client_size = mine->used;
107 memory_write_close(struct archive *a, void *client_data)
109 struct write_memory_data *mine;
110 (void)a; /* UNUSED */