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/* 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 "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. */
}
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