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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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/**
* @file
* @brief Manipulation of arbitrary data blobs
**/
/**
construct a data blob, must be freed with data_blob_free()
you can pass NULL for p and get a blank data blob
**/
_PUBLIC_ DATA_BLOB data_blob_named(const void *p, size_t length, const char *name)
{
DATA_BLOB ret;
if (p == NULL && length == 0) {
ZERO_STRUCT(ret);
return ret;
}
if (p) {
ret.data = (uint8_t *)talloc_memdup(NULL, p, length);
} else {
ret.data = talloc_array(NULL, uint8_t, length);
}
if (ret.data == NULL) {
ret.length = 0;
return ret;
}
talloc_set_name_const(ret.data, name);
ret.length = length;
return ret;
}
/**
construct a data blob, using supplied TALLOC_CTX
**/
_PUBLIC_ DATA_BLOB data_blob_talloc_named(TALLOC_CTX *mem_ctx, const void *p, size_t length, const char *name)
{
DATA_BLOB ret = data_blob_named(p, length, name);
if (ret.data) {
talloc_steal(mem_ctx, ret.data);
}
return ret;
}
/**
reference a data blob, to the supplied TALLOC_CTX.
Returns a NULL DATA_BLOB on failure
**/
_PUBLIC_ DATA_BLOB data_blob_talloc_reference(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
{
DATA_BLOB ret = *blob;
ret.data = talloc_reference(mem_ctx, blob->data);
if (!ret.data) {
return data_blob(NULL, 0);
}
return ret;
}
/**
construct a zero data blob, using supplied TALLOC_CTX.
use this sparingly as it initialises data - better to initialise
yourself if you want specific data in the blob
**/
_PUBLIC_ DATA_BLOB data_blob_talloc_zero(TALLOC_CTX *mem_ctx, size_t length)
{
DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, length);
data_blob_clear(&blob);
return blob;
}
/**
free a data blob
**/
_PUBLIC_ void data_blob_free(DATA_BLOB *d)
{
if (d) {
talloc_free(d->data);
d->data = NULL;
d->length = 0;
}
}
/**
clear a DATA_BLOB's contents
**/
_PUBLIC_ void data_blob_clear(DATA_BLOB *d)
{
if (d->data) {
memset(d->data, 0, d->length);
}
}
/**
free a data blob and clear its contents
**/
_PUBLIC_ void data_blob_clear_free(DATA_BLOB *d)
{
data_blob_clear(d);
data_blob_free(d);
}
/**
check if two data blobs are equal
**/
_PUBLIC_ int data_blob_cmp(const DATA_BLOB *d1, const DATA_BLOB *d2)
{
int ret;
if (d1->data == NULL && d2->data != NULL) {
return -1;
}
if (d1->data != NULL && d2->data == NULL) {
return 1;
}
if (d1->data == d2->data) {
return d1->length - d2->length;
}
ret = memcmp(d1->data, d2->data, MIN(d1->length, d2->length));
if (ret == 0) {
return d1->length - d2->length;
}
return ret;
}
/**
print the data_blob as hex string
**/
_PUBLIC_ char *data_blob_hex_string(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob)
{
int i;
char *hex_string;
hex_string = talloc_array(mem_ctx, char, (blob->length*2)+1);
if (!hex_string) {
return NULL;
}
for (i = 0; i < blob->length; i++)
slprintf(&hex_string[i*2], 3, "%02X", blob->data[i]);
hex_string[(blob->length*2)] = '\0';
return hex_string;
}
/**
useful for constructing data blobs in test suites, while
avoiding const warnings
**/
_PUBLIC_ DATA_BLOB data_blob_string_const(const char *str)
{
DATA_BLOB blob;
blob.data = discard_const_p(uint8_t, str);
blob.length = str ? strlen(str) : 0;
return blob;
}
/**
* Create a new data blob from const data
*/
_PUBLIC_ DATA_BLOB data_blob_const(const void *p, size_t length)
{
DATA_BLOB blob;
blob.data = discard_const_p(uint8_t, p);
blob.length = length;
return blob;
}
/**
realloc a data_blob
**/
_PUBLIC_ bool data_blob_realloc(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, size_t length)
{
blob->data = talloc_realloc(mem_ctx, blob->data, uint8_t, length);
if (blob->data == NULL)
return false;
blob->length = length;
return true;
}
/**
append some data to a data blob
**/
_PUBLIC_ bool data_blob_append(TALLOC_CTX *mem_ctx, DATA_BLOB *blob,
const void *p, size_t length)
{
size_t old_len = blob->length;
size_t new_len = old_len + length;
if (new_len < length || new_len < old_len) {
return false;
}
if ((const uint8_t *)p + length < (const uint8_t *)p) {
return false;
}
if (!data_blob_realloc(mem_ctx, blob, new_len)) {
return false;
}
memcpy(blob->data + old_len, p, length);
return true;
}
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