d06fa606c7
Merge from widevine repo of http://go/wvgerrit/23280 This CL moves some of the oemcrypto mock classes into their own files. There are no real code changes. Change-Id: I4e4a6a01d8e75051bc0eb2a5d58361c438c7f41b
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Mock implementation of OEMCrypto APIs
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//
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#include "oemcrypto_nonce_table.h"
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namespace wvoec_mock {
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void NonceTable::AddNonce(uint32_t nonce) {
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int new_slot = -1;
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int oldest_slot = -1;
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// Flush any nonces that have been checked but not flushed.
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// After flush, nonces will be either valid or invalid.
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Flush();
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for (int i = 0; i < kTableSize; ++i) {
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// Increase age of all valid nonces.
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if (kNTStateValid == state_[i]) {
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++age_[i];
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if (-1 == oldest_slot) {
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oldest_slot = i;
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} else {
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if (age_[i] > age_[oldest_slot]) {
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oldest_slot = i;
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}
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}
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} else {
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if (-1 == new_slot) {
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age_[i] = 0;
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nonces_[i] = nonce;
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state_[i] = kNTStateValid;
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new_slot = i;
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}
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}
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}
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if (-1 == new_slot) {
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// reuse oldest
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// assert (oldest_slot != -1)
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int i = oldest_slot;
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age_[i] = 0;
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nonces_[i] = nonce;
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state_[i] = kNTStateValid;
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}
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}
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bool NonceTable::CheckNonce(uint32_t nonce) {
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for (int i = 0; i < kTableSize; ++i) {
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if (kNTStateInvalid != state_[i]) {
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if (nonce == nonces_[i]) {
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state_[i] = kNTStateFlushPending;
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return true;
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}
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}
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}
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return false;
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}
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void NonceTable::Flush() {
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for (int i = 0; i < kTableSize; ++i) {
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if (kNTStateFlushPending == state_[i]) {
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state_[i] = kNTStateInvalid;
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}
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}
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}
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} // namespace wvoec_mock
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