1 /*-
2 * Copyright (c) 2003-2007 Tim Kientzle
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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.
24 */
25
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 $");
28
29 #include <errno.h>
30 #include <stdlib.h>
31 #include <string.h>
32
33 #include "archive.h"
34
35 struct write_memory_data {
36 size_t used;
37 size_t size;
38 size_t * client_size;
39 unsigned char * buff;
40 };
41
42 static int memory_write_free(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);
45
46 /*
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.
50 */
51 int
archive_write_open_memory(struct archive * a,void * buff,size_t buffSize,size_t * used)52 archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)
53 {
54 struct write_memory_data *mine;
55
56 mine = (struct write_memory_data *)calloc(1, sizeof(*mine));
57 if (mine == NULL) {
58 archive_set_error(a, ENOMEM, "No memory");
59 return (ARCHIVE_FATAL);
60 }
61 mine->buff = buff;
62 mine->size = buffSize;
63 mine->client_size = used;
64 return (archive_write_open2(a, mine,
65 memory_write_open, memory_write, NULL, memory_write_free));
66 }
67
68 static int
memory_write_open(struct archive * a,void * client_data)69 memory_write_open(struct archive *a, void *client_data)
70 {
71 struct write_memory_data *mine;
72 mine = client_data;
73 mine->used = 0;
74 if (mine->client_size != NULL)
75 *mine->client_size = mine->used;
76 /* Disable padding if it hasn't been set explicitly. */
77 if (-1 == archive_write_get_bytes_in_last_block(a))
78 archive_write_set_bytes_in_last_block(a, 1);
79 return (ARCHIVE_OK);
80 }
81
82 /*
83 * Copy the data into the client buffer.
84 * Note that we update mine->client_size on every write.
85 * In particular, this means the client can follow exactly
86 * how much has been written into their buffer at any time.
87 */
88 static ssize_t
memory_write(struct archive * a,void * client_data,const void * buff,size_t length)89 memory_write(struct archive *a, void *client_data, const void *buff, size_t length)
90 {
91 struct write_memory_data *mine;
92 mine = client_data;
93
94 if (mine->used + length > mine->size) {
95 archive_set_error(a, ENOMEM, "Buffer exhausted");
96 return (ARCHIVE_FATAL);
97 }
98 memcpy(mine->buff + mine->used, buff, length);
99 mine->used += length;
100 if (mine->client_size != NULL)
101 *mine->client_size = mine->used;
102 return (length);
103 }
104
105 static int
memory_write_free(struct archive * a,void * client_data)106 memory_write_free(struct archive *a, void *client_data)
107 {
108 struct write_memory_data *mine;
109 (void)a; /* UNUSED */
110 mine = client_data;
111 if (mine == NULL)
112 return (ARCHIVE_OK);
113 free(mine);
114 return (ARCHIVE_OK);
115 }
116