| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Easy management of byte-length data
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| 4 | Copyright (C) Andrew Tridgell 2001
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| 5 | Copyright (C) Andrew Bartlett 2001
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software
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| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 | */
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| 21 |
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| 22 | #include "includes.h"
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| 23 |
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| 24 | /*******************************************************************
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| 25 | Free() a data blob.
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| 26 | *******************************************************************/
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| 27 |
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| 28 | static void free_data_blob(DATA_BLOB *d)
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| 29 | {
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| 30 | if ((d) && (d->free)) {
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| 31 | SAFE_FREE(d->data);
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| 32 | }
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| 33 | }
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| 34 |
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| 35 | /*******************************************************************
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| 36 | Construct a data blob, must be freed with data_blob_free().
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| 37 | You can pass NULL for p and get a blank data blob
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| 38 | *******************************************************************/
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| 39 |
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| 40 | DATA_BLOB data_blob(const void *p, size_t length)
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| 41 | {
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| 42 | DATA_BLOB ret;
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| 43 |
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| 44 | if (!length) {
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| 45 | ZERO_STRUCT(ret);
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| 46 | return ret;
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| 47 | }
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| 48 |
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| 49 | if (p) {
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| 50 | ret.data = (uint8 *)smb_xmemdup(p, length);
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| 51 | } else {
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| 52 | ret.data = SMB_XMALLOC_ARRAY(uint8, length);
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| 53 | }
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| 54 | ret.length = length;
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| 55 | ret.free = free_data_blob;
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| 56 | return ret;
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| 57 | }
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| 58 |
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| 59 | /*******************************************************************
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| 60 | Construct a data blob, using supplied TALLOC_CTX.
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| 61 | *******************************************************************/
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| 62 |
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| 63 | DATA_BLOB data_blob_talloc(TALLOC_CTX *mem_ctx, const void *p, size_t length)
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| 64 | {
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| 65 | DATA_BLOB ret;
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| 66 |
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| 67 | if (!length) {
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| 68 | ZERO_STRUCT(ret);
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | if (p) {
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| 73 | ret.data = (uint8 *)TALLOC_MEMDUP(mem_ctx, p, length);
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| 74 | if (ret.data == NULL)
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| 75 | smb_panic("data_blob_talloc: TALLOC_MEMDUP failed.\n");
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| 76 | } else {
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| 77 | ret.data = (uint8 *)TALLOC(mem_ctx, length);
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| 78 | if (ret.data == NULL)
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| 79 | smb_panic("data_blob_talloc: talloc failed.\n");
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| 80 | }
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| 81 |
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| 82 | ret.length = length;
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| 83 | ret.free = NULL;
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| 84 | return ret;
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| 85 | }
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| 86 |
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| 87 | /*******************************************************************
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| 88 | Free a data blob.
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| 89 | *******************************************************************/
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| 90 |
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| 91 | void data_blob_free(DATA_BLOB *d)
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| 92 | {
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| 93 | if (d) {
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| 94 | if (d->free) {
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| 95 | (d->free)(d);
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| 96 | }
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| 97 | d->length = 0;
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| 98 | }
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| 99 | }
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| 100 |
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| 101 | /*******************************************************************
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| 102 | Clear a DATA_BLOB's contents
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| 103 | *******************************************************************/
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| 104 |
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| 105 | void data_blob_clear(DATA_BLOB *d)
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| 106 | {
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| 107 | if (d->data) {
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| 108 | memset(d->data, 0, d->length);
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | /*******************************************************************
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| 113 | Free a data blob and clear its contents
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| 114 | *******************************************************************/
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| 115 |
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| 116 | void data_blob_clear_free(DATA_BLOB *d)
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| 117 | {
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| 118 | data_blob_clear(d);
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| 119 | data_blob_free(d);
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| 120 | }
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| 121 |
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| 122 | /**
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| 123 | useful for constructing data blobs in test suites, while
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| 124 | avoiding const warnings
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| 125 | **/
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| 126 | DATA_BLOB data_blob_string_const(const char *str)
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| 127 | {
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| 128 | DATA_BLOB blob;
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| 129 | blob.data = CONST_DISCARD(uint8 *, str);
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| 130 | blob.length = strlen(str);
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| 131 | blob.free = NULL;
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| 132 | return blob;
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| 133 | }
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| 134 |
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| 135 | /**
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| 136 | * Create a new data blob from const data
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| 137 | */
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| 138 | DATA_BLOB data_blob_const(const void *p, size_t length)
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| 139 | {
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| 140 | DATA_BLOB blob;
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| 141 | blob.data = CONST_DISCARD(uint8 *, p);
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| 142 | blob.length = length;
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| 143 | blob.free = NULL;
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| 144 | return blob;
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| 145 | }
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