2 Unix SMB/CIFS implementation.
3 Easy management of byte-length data
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Andrew Bartlett 2001
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.
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.
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.
26 * @brief Manipulation of arbitrary data blobs
30 construct a data blob, must be freed with data_blob_free()
31 you can pass NULL for p and get a blank data blob
33 _PUBLIC_ DATA_BLOB data_blob_named(const void *p, size_t length, const char *name)
37 if (p == NULL && length == 0) {
43 ret.data = talloc_memdup(NULL, p, length);
45 ret.data = talloc_size(NULL, length);
47 if (ret.data == NULL) {
51 talloc_set_name_const(ret.data, name);
57 construct a data blob, using supplied TALLOC_CTX
59 _PUBLIC_ DATA_BLOB data_blob_talloc_named(TALLOC_CTX *mem_ctx, const void *p, size_t length, const char *name)
61 DATA_BLOB ret = data_blob_named(p, length, name);
64 talloc_steal(mem_ctx, ret.data);
71 reference a data blob, to the supplied TALLOC_CTX.
72 Returns a NULL DATA_BLOB on failure
74 _PUBLIC_ DATA_BLOB data_blob_talloc_reference(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
76 DATA_BLOB ret = *blob;
78 ret.data = talloc_reference(mem_ctx, blob->data);
81 return data_blob(NULL, 0);
87 construct a zero data blob, using supplied TALLOC_CTX.
88 use this sparingly as it initialises data - better to initialise
89 yourself if you want specific data in the blob
91 _PUBLIC_ DATA_BLOB data_blob_talloc_zero(TALLOC_CTX *mem_ctx, size_t length)
93 DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, length);
94 data_blob_clear(&blob);
101 _PUBLIC_ void data_blob_free(DATA_BLOB *d)
104 talloc_free(d->data);
111 clear a DATA_BLOB's contents
113 _PUBLIC_ void data_blob_clear(DATA_BLOB *d)
116 memset(d->data, 0, d->length);
121 free a data blob and clear its contents
123 _PUBLIC_ void data_blob_clear_free(DATA_BLOB *d)
131 check if two data blobs are equal
133 _PUBLIC_ int data_blob_cmp(const DATA_BLOB *d1, const DATA_BLOB *d2)
136 if (d1->data == NULL && d2->data != NULL) {
139 if (d1->data != NULL && d2->data == NULL) {
142 if (d1->data == d2->data) {
143 return d1->length - d2->length;
145 ret = memcmp(d1->data, d2->data, MIN(d1->length, d2->length));
147 return d1->length - d2->length;
153 print the data_blob as hex string
155 _PUBLIC_ char *data_blob_hex_string(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob)
160 hex_string = talloc_array(mem_ctx, char, (blob->length*2)+1);
165 for (i = 0; i < blob->length; i++)
166 slprintf(&hex_string[i*2], 3, "%02X", blob->data[i]);
168 hex_string[(blob->length*2)] = '\0';
173 useful for constructing data blobs in test suites, while
174 avoiding const warnings
176 _PUBLIC_ DATA_BLOB data_blob_string_const(const char *str)
179 blob.data = discard_const(str);
180 blob.length = strlen(str);
185 * Create a new data blob from const data
188 _PUBLIC_ DATA_BLOB data_blob_const(const void *p, size_t length)
191 blob.data = discard_const(p);
192 blob.length = length;
200 _PUBLIC_ NTSTATUS data_blob_realloc(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, size_t length)
202 blob->data = talloc_realloc_size(mem_ctx, blob->data, length);
203 NT_STATUS_HAVE_NO_MEMORY(blob->data);
204 blob->length = length;
210 append some data to a data blob
212 _PUBLIC_ NTSTATUS data_blob_append(TALLOC_CTX *mem_ctx, DATA_BLOB *blob,
213 const void *p, size_t length)
216 size_t old_len = blob->length;
217 size_t new_len = old_len + length;
218 if (new_len < length || new_len < old_len) {
219 return NT_STATUS_NO_MEMORY;
222 if ((const uint8_t *)p + length < (const uint8_t *)p) {
223 return NT_STATUS_NO_MEMORY;
226 status = data_blob_realloc(mem_ctx, blob, new_len);
227 if (!NT_STATUS_IS_OK(status)) {
231 memcpy(blob->data + old_len, p, length);