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-rw-r--r--source4/lib/data_blob.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/source4/lib/data_blob.c b/source4/lib/data_blob.c
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+/*
+ Unix SMB/CIFS implementation.
+ Easy management of byte-length data
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Andrew Bartlett 2001
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/*******************************************************************
+ free() a data blob
+*******************************************************************/
+static void free_data_blob(DATA_BLOB *d)
+{
+ if ((d) && (d->free)) {
+ SAFE_FREE(d->data);
+ }
+}
+
+/*******************************************************************
+ construct a data blob, must be freed with data_blob_free()
+ you can pass NULL for p and get a blank data blob
+*******************************************************************/
+DATA_BLOB data_blob(const void *p, size_t length)
+{
+ DATA_BLOB ret;
+
+ if (!length) {
+ ZERO_STRUCT(ret);
+ return ret;
+ }
+
+ if (p) {
+ ret.data = smb_xmemdup(p, length);
+ } else {
+ ret.data = smb_xmalloc(length);
+ }
+ ret.length = length;
+ ret.free = free_data_blob;
+ return ret;
+}
+
+/*******************************************************************
+ construct a data blob, using supplied TALLOC_CTX
+*******************************************************************/
+DATA_BLOB data_blob_talloc(TALLOC_CTX *mem_ctx, const void *p, size_t length)
+{
+ DATA_BLOB ret;
+
+ if (length == 0) {
+ ZERO_STRUCT(ret);
+ return ret;
+ }
+
+ if (p == NULL) {
+ ret.data = talloc(mem_ctx, length);
+ if (ret.data == NULL) {
+ smb_panic("data_blob_talloc: talloc_memdup failed.\n");
+ }
+ ret.length = length;
+ memset(ret.data, 0, ret.length);
+ return ret;
+ }
+
+ ret.data = talloc_memdup(mem_ctx, p, length);
+ if (ret.data == NULL) {
+ smb_panic("data_blob_talloc: talloc_memdup failed.\n");
+ }
+
+ ret.length = length;
+ ret.free = NULL;
+ return ret;
+}
+
+/*******************************************************************
+free a data blob
+*******************************************************************/
+void data_blob_free(DATA_BLOB *d)
+{
+ if (d) {
+ if (d->free) {
+ (d->free)(d);
+ }
+ d->length = 0;
+ }
+}
+
+/*******************************************************************
+clear a DATA_BLOB's contents
+*******************************************************************/
+void data_blob_clear(DATA_BLOB *d)
+{
+ if (d->data) {
+ memset(d->data, 0, d->length);
+ }
+}
+
+/*******************************************************************
+free a data blob and clear its contents
+*******************************************************************/
+void data_blob_clear_free(DATA_BLOB *d)
+{
+ data_blob_clear(d);
+ data_blob_free(d);
+}
+
+
+/*******************************************************************
+check if two data blobs are equal
+*******************************************************************/
+BOOL data_blob_equal(DATA_BLOB *d1, DATA_BLOB *d2)
+{
+ if (d1->length != d2->length) {
+ return False;
+ }
+ if (d1->data == d2->data) {
+ return True;
+ }
+ if (d1->data == NULL || d2->data == NULL) {
+ return False;
+ }
+ if (memcmp(d1->data, d2->data, d1->length) == 0) {
+ return True;
+ }
+ return False;
+}
+