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
  39 DATA_BLOB data_blob(const void *p, size_t length)
  40 {
  41         DATA_BLOB ret;
  42
  43         if (!length) {
  44                 ZERO_STRUCT(ret);
  45                 return ret;
  46         }
  47
  48         if (p) {
  49                 ret.data = smb_xmemdup(p, length);
  50         } else {
  51                 ret.data = SMB_XMALLOC_ARRAY(unsigned char, length);
  52         }
  53         ret.length = length;
  54         ret.free = free_data_blob;
  55         return ret;
  56 }
  57
  58 /*******************************************************************
  59  construct a data blob, using supplied TALLOC_CTX
  60 *******************************************************************/
  61 DATA_BLOB data_blob_talloc(TALLOC_CTX *mem_ctx, const void *p, size_t length)
  62 {
  63         DATA_BLOB ret;
  64
  65         if (!length) {
  66                 ZERO_STRUCT(ret);
  67                 return ret;
  68         }
  69
  70         if (p) {
  71                 ret.data = TALLOC_MEMDUP(mem_ctx, p, length);
  72                 if (ret.data == NULL)
  73                         smb_panic("data_blob_talloc: talloc_memdup failed.\n");
  74         } else {
  75                 ret.data = TALLOC(mem_ctx, length);
  76                 if (ret.data == NULL)
  77                         smb_panic("data_blob_talloc: talloc failed.\n");
  78         }
  79
  80         ret.length = length;
  81         ret.free = NULL;
  82         return ret;
  83 }
  84
  85 /*******************************************************************
  86 free a data blob
  87 *******************************************************************/
  88 void data_blob_free(DATA_BLOB *d)
  89 {
  90         if (d) {
  91                 if (d->free) {
  92                         (d->free)(d);
  93                 }
  94                 d->length = 0;
  95         }
  96 }
  97
  98 /*******************************************************************
  99 clear a DATA_BLOB's contents
 100 *******************************************************************/
 101 static void data_blob_clear(DATA_BLOB *d)
 102 {
 103         if (d->data) {
 104                 memset(d->data, 0, d->length);
 105         }
 106 }
 107
 108 /*******************************************************************
 109 free a data blob and clear its contents
 110 *******************************************************************/
 111 void data_blob_clear_free(DATA_BLOB *d)
 112 {
 113         data_blob_clear(d);
 114         data_blob_free(d);
 115 }
 116