You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.7 KiB
75 lines
1.7 KiB
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*
|
|
* Implementations of stateful memory operations.
|
|
*/
|
|
|
|
#include "sysincludes.h"
|
|
|
|
#include "stateful_util.h"
|
|
#include "utility.h"
|
|
|
|
void StatefulInit(MemcpyState *state, void *buf, uint64_t len)
|
|
{
|
|
state->remaining_buf = buf;
|
|
state->remaining_len = len;
|
|
state->overrun = 0;
|
|
}
|
|
|
|
void *StatefulSkip(MemcpyState *state, uint64_t len)
|
|
{
|
|
if (state->overrun)
|
|
return NULL;
|
|
if (len > state->remaining_len) {
|
|
state->overrun = 1;
|
|
return NULL;
|
|
}
|
|
state->remaining_buf += len;
|
|
state->remaining_len -= len;
|
|
return state; /* Must return something non-NULL. */
|
|
}
|
|
|
|
void *StatefulMemcpy(MemcpyState *state, void *dst, uint64_t len)
|
|
{
|
|
if (state->overrun)
|
|
return NULL;
|
|
if (len > state->remaining_len) {
|
|
state->overrun = 1;
|
|
return NULL;
|
|
}
|
|
Memcpy(dst, state->remaining_buf, len);
|
|
state->remaining_buf += len;
|
|
state->remaining_len -= len;
|
|
return dst;
|
|
}
|
|
|
|
const void *StatefulMemcpy_r(MemcpyState *state, const void *src, uint64_t len)
|
|
{
|
|
if (state->overrun)
|
|
return NULL;
|
|
if (len > state->remaining_len) {
|
|
state->overrun = 1;
|
|
return NULL;
|
|
}
|
|
Memcpy(state->remaining_buf, src, len);
|
|
state->remaining_buf += len;
|
|
state->remaining_len -= len;
|
|
return src;
|
|
}
|
|
|
|
const void *StatefulMemset_r(MemcpyState *state, const uint8_t val,
|
|
uint64_t len)
|
|
{
|
|
if (state->overrun)
|
|
return NULL;
|
|
if (len > state->remaining_len) {
|
|
state->overrun = 1;
|
|
return NULL;
|
|
}
|
|
Memset(state->remaining_buf, val, len);
|
|
state->remaining_buf += len;
|
|
state->remaining_len -= len;
|
|
return state; /* Must return something non-NULL. */
|
|
}
|