source/lib/data_blob.c

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