lib/util/data_blob.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    DATA BLOB
   4
   5    Copyright (C) Andrew Tridgell 2001
   6    Copyright (C) Andrew Bartlett 2001
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /* This is a public header file that is installed as part of Samba.
  23  * If you remove any functions or change their signature, update
  24  * the so version number. */
  25
  26 #ifndef _SAMBA_DATABLOB_H_
  27 #define _SAMBA_DATABLOB_H_
  28
  29 #ifndef _PUBLIC_
  30 #define _PUBLIC_
  31 #endif
  32
  33 #include <talloc.h>
  34 #include <stdint.h>
  35
  36 /* used to hold an arbitrary blob of data */
  37 typedef struct datablob {
  38         uint8_t *data;
  39         size_t length;
  40 } DATA_BLOB;
  41
  42 struct data_blob_list_item {
  43         struct data_blob_list_item *prev,*next;
  44         DATA_BLOB blob;
  45 };
  46
  47 /* by making struct ldb_val and DATA_BLOB the same, we can simplify
  48    a fair bit of code */
  49 #define ldb_val datablob
  50
  51 #define data_blob(ptr, size) data_blob_named(ptr, size, "DATA_BLOB: "__location__)
  52 #define data_blob_talloc(ctx, ptr, size) data_blob_talloc_named(ctx, ptr, size, "DATA_BLOB: "__location__)
  53 #define data_blob_dup_talloc(ctx, blob) data_blob_talloc_named(ctx, (blob).data, (blob).length, "DATA_BLOB: "__location__)
  54
  55 /**
  56  construct a data blob, must be freed with data_blob_free()
  57  you can pass NULL for p and get a blank data blob
  58 **/
  59 _PUBLIC_ DATA_BLOB data_blob_named(const void *p, size_t length, const char *name);
  60
  61 /**
  62  construct a data blob, using supplied TALLOC_CTX
  63 **/
  64 _PUBLIC_ DATA_BLOB data_blob_talloc_named(TALLOC_CTX *mem_ctx, const void *p, size_t length, const char *name);
  65
  66 /**
  67  construct a zero data blob, using supplied TALLOC_CTX.
  68  use this sparingly as it initialises data - better to initialise
  69  yourself if you want specific data in the blob
  70 **/
  71 _PUBLIC_ DATA_BLOB data_blob_talloc_zero(TALLOC_CTX *mem_ctx, size_t length);
  72
  73 /**
  74 free a data blob
  75 **/
  76 _PUBLIC_ void data_blob_free(DATA_BLOB *d);
  77
  78 /**
  79 clear a DATA_BLOB's contents
  80 **/
  81 _PUBLIC_ void data_blob_clear(DATA_BLOB *d);
  82
  83 /**
  84 free a data blob and clear its contents
  85 **/
  86 _PUBLIC_ void data_blob_clear_free(DATA_BLOB *d);
  87
  88 /**
  89 check if two data blobs are equal
  90 **/
  91 _PUBLIC_ int data_blob_cmp(const DATA_BLOB *d1, const DATA_BLOB *d2);
  92
  93 /**
  94 print the data_blob as hex string
  95 **/
  96 _PUBLIC_ char *data_blob_hex_string_upper(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob);
  97
  98 /**
  99 print the data_blob as hex string
 100 **/
 101 _PUBLIC_ char *data_blob_hex_string_lower(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob);
 102
 103 /**
 104   useful for constructing data blobs in test suites, while
 105   avoiding const warnings
 106 **/
 107 _PUBLIC_ DATA_BLOB data_blob_string_const(const char *str);
 108
 109 /**
 110   useful for constructing data blobs in test suites, while
 111   avoiding const warnings
 112
 113   includes the terminating null character (as opposed to data_blo_string_const)
 114 **/
 115 _PUBLIC_ DATA_BLOB data_blob_string_const_null(const char *str);
 116
 117 /**
 118  * Create a new data blob from const data
 119  */
 120 _PUBLIC_ DATA_BLOB data_blob_const(const void *p, size_t length);
 121
 122 /**
 123   realloc a data_blob
 124 **/
 125 _PUBLIC_ bool data_blob_realloc(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, size_t length);
 126
 127 /**
 128   append some data to a data blob
 129 **/
 130 _PUBLIC_ bool data_blob_append(TALLOC_CTX *mem_ctx, DATA_BLOB *blob,
 131                                    const void *p, size_t length);
 132
 133 extern const DATA_BLOB data_blob_null;
 134
 135 #endif /* _SAMBA_DATABLOB_H_ */