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
28 #include <errno.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "archive.h"
33
34 struct write_memory_data {
35 size_t used;
36 size_t size;
37 size_t * client_size;
38 unsigned char * buff;
39 };
40
41 static int memory_write_free(struct archive *, void *);
42 static int memory_write_open(struct archive *, void *);
43 static ssize_t memory_write(struct archive *, void *, const void *buff, size_t);
44
45 /*
46 * Client provides a pointer to a block of memory to receive
47 * the data. The 'size' param both tells us the size of the
48 * client buffer and lets us tell the client the final size.
49 */
50 int
archive_write_open_memory(struct archive * a,void * buff,size_t buffSize,size_t * used)51 archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)
52 {
53 struct write_memory_data *mine;
54
55 mine = (struct write_memory_data *)calloc(1, sizeof(*mine));
56 if (mine == NULL) {
57 archive_set_error(a, ENOMEM, "No memory");
58 return (ARCHIVE_FATAL);
59 }
60 mine->buff = buff;
61 mine->size = buffSize;
62 mine->client_size = used;
63 return (archive_write_open2(a, mine,
64 memory_write_open, memory_write, NULL, memory_write_free));
65 }
66
67 static int
memory_write_open(struct archive * a,void * client_data)68 memory_write_open(struct archive *a, void *client_data)
69 {
70 struct write_memory_data *mine;
71 mine = client_data;
72 mine->used = 0;
73 if (mine->client_size != NULL)
74 *mine->client_size = mine->used;
75 /* Disable padding if it hasn't been set explicitly. */
76 if (-1 == archive_write_get_bytes_in_last_block(a))
77 archive_write_set_bytes_in_last_block(a, 1);
78 return (ARCHIVE_OK);
79 }
80
81 /*
82 * Copy the data into the client buffer.
83 * Note that we update mine->client_size on every write.
84 * In particular, this means the client can follow exactly
85 * how much has been written into their buffer at any time.
86 */
87 static ssize_t
memory_write(struct archive * a,void * client_data,const void * buff,size_t length)88 memory_write(struct archive *a, void *client_data, const void *buff, size_t length)
89 {
90 struct write_memory_data *mine;
91 mine = client_data;
92
93 if (mine->used + length > mine->size) {
94 archive_set_error(a, ENOMEM, "Buffer exhausted");
95 return (ARCHIVE_FATAL);
96 }
97 memcpy(mine->buff + mine->used, buff, length);
98 mine->used += length;
99 if (mine->client_size != NULL)
100 *mine->client_size = mine->used;
101 return (length);
102 }
103
104 static int
memory_write_free(struct archive * a,void * client_data)105 memory_write_free(struct archive *a, void *client_data)
106 {
107 struct write_memory_data *mine;
108 (void)a; /* UNUSED */
109 mine = client_data;
110 if (mine == NULL)
111 return (ARCHIVE_OK);
112 free(mine);
113 return (ARCHIVE_OK);
114 }
115