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1f5d53f7bd
BUG=chromium-os:17564 TEST=make && make runtests Change-Id: I5d55be2dfead0c5d7af72841cbd6c65485685cd6 Reviewed-on: http://gerrit.chromium.org/gerrit/6596 Reviewed-by: Stefan Reinauer <reinauer@chromium.org> Tested-by: Randall Spangler <rspangler@chromium.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Implementations of stateful memory operations.
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*/
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#include "stateful_util.h"
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#include "utility.h"
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void StatefulInit(MemcpyState* state, void* buf, uint64_t len) {
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state->remaining_buf = buf;
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state->remaining_len = len;
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state->overrun = 0;
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}
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void* StatefulSkip(MemcpyState* state, uint64_t len) {
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if (state->overrun)
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return NULL;
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if (len > state->remaining_len) {
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state->overrun = 1;
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return NULL;
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}
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state->remaining_buf += len;
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state->remaining_len -= len;
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return state; // have to return something non-NULL
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}
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void* StatefulMemcpy(MemcpyState* state, void* dst,
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uint64_t len) {
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if (state->overrun)
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return NULL;
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if (len > state->remaining_len) {
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state->overrun = 1;
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return NULL;
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}
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Memcpy(dst, state->remaining_buf, len);
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state->remaining_buf += len;
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state->remaining_len -= len;
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return dst;
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}
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const void* StatefulMemcpy_r(MemcpyState* state, const void* src,
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uint64_t len) {
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if (state->overrun)
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return NULL;
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if (len > state->remaining_len) {
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state->overrun = 1;
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return NULL;
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}
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Memcpy(state->remaining_buf, src, len);
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state->remaining_buf += len;
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state->remaining_len -= len;
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return src;
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}
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const void* StatefulMemset_r(MemcpyState* state, const uint8_t val,
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uint64_t len) {
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if (state->overrun)
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return NULL;
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if (len > state->remaining_len) {
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state->overrun = 1;
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return NULL;
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}
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Memset(state->remaining_buf, val, len);
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state->remaining_buf += len;
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state->remaining_len -= len;
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return state; // have to return something non-NULL
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}
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