upload android base code part6

android/system/keymaster/operation_table.cpp

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed 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.
+ */
+
+#include "operation_table.h"
+
+#include <keymaster/new>
+
+#include <openssl/rand.h>
+
+#include "openssl_err.h"
+#include "operation.h"
+
+namespace keymaster {
+
+OperationTable::Entry::~Entry() {
+    delete operation;
+    operation = NULL;
+    handle = 0;
+}
+
+keymaster_error_t OperationTable::Add(Operation* operation, const KeymasterContext& context,
+                                      keymaster_operation_handle_t* op_handle) {
+    if (!table_.get()) {
+        table_.reset(new (std::nothrow) Entry[table_size_]);
+        if (!table_.get())
+            return KM_ERROR_MEMORY_ALLOCATION_FAILED;
+    }
+
+    UniquePtr<Operation> op(operation);
+    keymaster_error_t error = operation->CreateOperationHandle(context, op_handle);
+    if (error != KM_ERROR_OK)
+        return error;
+    if (*op_handle == 0) {
+        // Statistically this is vanishingly unlikely, which means if it ever happens in practice,
+        // it indicates a broken RNG.
+        return KM_ERROR_UNKNOWN_ERROR;
+    }
+
+    for (size_t i = 0; i < table_size_; ++i) {
+        if (table_[i].operation == NULL) {
+            table_[i].operation = op.release();
+            table_[i].handle = *op_handle;
+            return KM_ERROR_OK;
+        }
+    }
+    return KM_ERROR_TOO_MANY_OPERATIONS;
+}
+
+Operation* OperationTable::Find(keymaster_operation_handle_t op_handle) {
+    if (op_handle == 0)
+        return NULL;
+
+    if (!table_.get())
+        return NULL;
+
+    for (size_t i = 0; i < table_size_; ++i) {
+        if (table_[i].handle == op_handle)
+            return table_[i].operation;
+    }
+    return NULL;
+}
+
+bool OperationTable::Delete(keymaster_operation_handle_t op_handle) {
+    if (!table_.get())
+        return false;
+
+    for (size_t i = 0; i < table_size_; ++i) {
+        if (table_[i].handle == op_handle) {
+            delete table_[i].operation;
+            table_[i].operation = NULL;
+            table_[i].handle = 0;
+            return true;
+        }
+    }
+    return false;
+}
+
+}  // namespace keymaster