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bytestr.c
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bytestr.c
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/*****************************************************************************
* Licensed to Qualys, Inc. (QUALYS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* QUALYS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
****************************************************************************/
/**
* @file
* @brief IronBee --- Utility Byte String Functions
* @author Brian Rectanus <brectanus@qualys.com>
* @author Christopher Alfeld <calfeld@qualys.com>
*/
#include "ironbee_config_auto.h"
#include <ironbee/bytestr.h>
#include <ironbee/mm.h>
#include <ironbee/string.h>
#include <assert.h>
#include <stdbool.h>
struct ib_bytestr_t {
ib_mm_t mm;
ib_flags_t flags;
uint8_t *data;
size_t length;
size_t size;
};
size_t ib_bytestr_length(
const ib_bytestr_t *bs
) {
assert(bs != NULL);
return bs->length;
}
size_t ib_bytestr_size(
const ib_bytestr_t *bs
) {
assert(bs != NULL);
return bs->size;
}
ib_mm_t ib_bytestr_mm(const ib_bytestr_t *bs)
{
return bs->mm;
}
uint8_t *ib_bytestr_ptr(
ib_bytestr_t *bs
) {
if (bs == NULL || IB_BYTESTR_CHECK_FREADONLY(bs->flags)) {
return NULL;
}
return bs->data;
}
const uint8_t DLL_PUBLIC *ib_bytestr_const_ptr(
const ib_bytestr_t *bs
) {
if (bs == NULL) {
return NULL;
}
return bs->data;
}
ib_status_t ib_bytestr_create(
ib_bytestr_t **pdst,
ib_mm_t mm,
size_t size
) {
assert(pdst != NULL);
ib_status_t rc;
/* Create the structure. */
*pdst = (ib_bytestr_t *)ib_mm_alloc(mm, sizeof(**pdst));
if (*pdst == NULL) {
rc = IB_EALLOC;
goto failed;
}
(*pdst)->data = NULL;
(*pdst)->mm = mm;
(*pdst)->flags = 0;
(*pdst)->size = size;
(*pdst)->length = 0;
if (size != 0) {
(*pdst)->data = (uint8_t *)ib_mm_alloc(mm, size);
if ((*pdst)->data == NULL) {
rc = IB_EALLOC;
goto failed;
}
}
return IB_OK;
failed:
*pdst = NULL;
return rc;
}
ib_status_t ib_bytestr_dup(
ib_bytestr_t **pdst,
ib_mm_t mm,
const ib_bytestr_t *src
) {
assert(pdst != NULL);
ib_status_t rc;
rc = ib_bytestr_dup_mem(
pdst,
mm,
ib_bytestr_const_ptr(src),
ib_bytestr_length(src)
);
return rc;
}
ib_status_t ib_bytestr_dup_mem(
ib_bytestr_t **pdst,
ib_mm_t mm,
const uint8_t *data,
size_t data_length
) {
assert(pdst != NULL);
if (data == NULL && data_length != 0) {
return IB_EINVAL;
}
ib_status_t rc = ib_bytestr_create(pdst, mm, data_length);
if (rc != IB_OK) {
return rc;
}
if (data != NULL) {
assert((*pdst)->size >= data_length);
memcpy(ib_bytestr_ptr(*pdst), data, data_length);
(*pdst)->length = data_length;
}
return IB_OK;
}
ib_status_t ib_bytestr_dup_nulstr(
ib_bytestr_t **pdst,
ib_mm_t mm,
const char *data
) {
assert(pdst != NULL);
assert(data != NULL);
ib_status_t rc = ib_bytestr_dup_mem(
pdst,
mm,
(uint8_t *)data,
strlen(data)
);
return rc;
}
ib_status_t ib_bytestr_alias(
ib_bytestr_t **pdst,
ib_mm_t mm,
const ib_bytestr_t *src
)
{
assert(pdst != NULL);
ib_status_t rc;
if ((src == NULL) || (src->data == NULL)) {
return IB_EINVAL;
}
rc = ib_bytestr_alias_mem(
pdst,
mm,
ib_bytestr_const_ptr(src),
src->length
);
return rc;
}
ib_status_t ib_bytestr_alias_mem(
ib_bytestr_t **pdst,
ib_mm_t mm,
const uint8_t *data,
size_t data_length
)
{
if (data == NULL && data_length > 0) {
return IB_EINVAL;
}
ib_status_t rc = ib_bytestr_create(pdst, mm, 0);
if (rc != IB_OK) {
return rc;
}
/* We use flags to enforce that the user can not recover an non-const
* pointer.
*/
(*pdst)->data = (uint8_t*)data;
(*pdst)->length = data_length;
(*pdst)->size = data_length;
(*pdst)->flags |= IB_BYTESTR_FREADONLY;
return IB_OK;
}
ib_status_t ib_bytestr_alias_nulstr(
ib_bytestr_t **pdst,
ib_mm_t mm,
const char *data
)
{
assert(pdst != NULL);
ib_status_t rc;
rc = ib_bytestr_alias_mem(pdst, mm, (uint8_t *)data, strlen(data));
return rc;
}
ib_status_t ib_bytestr_setv(
ib_bytestr_t *dst,
uint8_t *data,
size_t data_length
) {
if (dst == NULL) {
return IB_EINVAL;
}
if (data == NULL && data_length != 0) {
return IB_EINVAL;
}
dst->data = data;
dst->length = data_length;
dst->size = data_length;
dst->flags = 0;
return IB_OK;
}
ib_status_t DLL_PUBLIC ib_bytestr_setv_const(
ib_bytestr_t *dst,
const uint8_t *data,
size_t data_length
)
{
ib_status_t rc;
/* Use flags to enforce const. */
rc = ib_bytestr_setv(dst, (uint8_t*)data, data_length);
if (rc != IB_OK) {
return rc;
}
dst->flags |= IB_BYTESTR_FREADONLY;
return IB_OK;
}
ib_status_t ib_bytestr_append(
ib_bytestr_t *dst,
const ib_bytestr_t *src
)
{
ib_status_t rc;
if ( src == NULL ) {
return IB_EINVAL;
}
rc = ib_bytestr_append_mem(
dst,
ib_bytestr_const_ptr(src),
ib_bytestr_length(src)
);
return rc;
}
ib_status_t ib_bytestr_append_mem(
ib_bytestr_t *dst,
const uint8_t *data,
size_t data_length
)
{
size_t dst_length = ib_bytestr_length(dst);
size_t new_length;
uint8_t *new_data = NULL;
if (dst == NULL || IB_BYTESTR_CHECK_FREADONLY(dst->flags)) {
return IB_EINVAL;
}
if (data == NULL && data_length != 0) {
return IB_EINVAL;
}
new_length = dst_length + data_length;
if (new_length > dst->size) {
new_data = (uint8_t *)ib_mm_alloc(dst->mm, new_length);
if (new_data == NULL) {
return IB_EALLOC;
}
if (dst_length > 0) {
memcpy(
new_data,
ib_bytestr_const_ptr(dst),
ib_bytestr_length(dst)
);
}
dst->data = new_data;
dst->size = new_length;
}
assert(new_length <= dst->size);
if (data_length > 0) {
memcpy(dst->data + dst_length, data, data_length);
dst->length = new_length;
}
return IB_OK;
}
ib_status_t ib_bytestr_append_nulstr(
ib_bytestr_t *dst,
const char *data
)
{
ib_status_t rc;
if (data == NULL) {
return IB_EINVAL;
}
rc = ib_bytestr_append_mem(dst, (const uint8_t*)data, strlen(data));
return rc;
}
int ib_bytestr_read_only( const ib_bytestr_t *bs )
{
assert(bs != NULL);
return IB_BYTESTR_CHECK_FREADONLY(bs->flags);
}
void ib_bytestr_make_read_only( ib_bytestr_t *bs )
{
bs->flags |= IB_BYTESTR_FREADONLY;
return;
}
int ib_bytestr_memcmp(
const ib_bytestr_t *bs,
const void *mem,
size_t len
)
{
assert(bs != NULL);
assert(mem != NULL);
/* Find the shorter length. */
size_t short_len = (bs->length < len)? bs->length : len;
/* See if we can find a difference in the shorter length. */
int cmp = memcmp(bs->data, mem, short_len);
/* If there is a difference in the first few bytes, that's our solution. */
if (cmp != 0) {
return cmp;
}
/* Otherwise, the longer is the larger. */
if (bs->length < len) {
return -1;
}
if (bs->length > len) {
return 1;
}
return 0;}
int ib_bytestr_strcmp(
const ib_bytestr_t *bs,
const char *str
)
{
assert(bs != NULL);
assert(str != NULL);
return ib_bytestr_memcmp(bs, str, strlen(str));
}
int ib_bytestr_bscmp(
const ib_bytestr_t *bs,
const ib_bytestr_t *that
)
{
assert(bs != NULL);
assert(that != NULL);
return ib_bytestr_memcmp(bs, that->data, that->length);
}