emulator/opengl: Add UniqueIntegerMap class.

This helper class will be used by future patches to map arbitraty
opaque 'void*' values (e.g. EGLImage values) to 32-bit unique values
that can be sent through the wire protocol.

Change-Id: I5b17a1f230e5f9f8b905af66ba79b312f3f01e55

1 files changed, 103 insertions, 0 deletions

diff --git a/emulator/opengl/shared/emugl/common/unique_integer_map_unittest.cpp b/emulator/opengl/shared/emugl/common/unique_integer_map_unittest.cpp
new file mode 100644
index 0000000..8aee013
--- /dev/null
+++ b/emulator/opengl/shared/emugl/common/unique_integer_map_unittest.cpp
@@ -0,0 +1,103 @@
+// Copyright (C) 2014 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 "emugl/common/unique_integer_map.h"
+
+#include <gtest/gtest.h>
+
+#include <stdio.h>
+
+namespace emugl {
+
+typedef UniqueIntegerMap<uintptr_t,uint32_t> MyMap;
+
+TEST(UniqueIntegerMap, Empty) {
+    MyMap map;
+
+    EXPECT_TRUE(map.empty());
+    EXPECT_EQ(0U, map.size());
+    EXPECT_EQ(0U, map.find(0U));
+    EXPECT_EQ(0U, map.find(1U));
+    EXPECT_EQ(0U, map.find(2U));
+    EXPECT_EQ(0U, map.find(4U));
+}
+
+TEST(UniqueIntegerMap, AddOne) {
+    MyMap map;
+    uintptr_t key1 = 1U;
+    uint32_t val1 = map.add(key1);
+
+    EXPECT_NE(0U, val1);
+    EXPECT_EQ(val1, map.find(key1));
+    EXPECT_EQ(key1, map.findKeyFor(val1));
+
+    EXPECT_FALSE(map.empty());
+    EXPECT_EQ(1U, map.size());
+
+    EXPECT_EQ(0U, map.find(0));
+    EXPECT_EQ(0U, map.findKeyFor(0));
+
+    EXPECT_EQ(0U, map.find(key1 + 1));
+    EXPECT_EQ(0U, map.findKeyFor(val1 + 1));
+}
+
+TEST(UniqueIntegerMap, AddMultiple) {
+    MyMap map;
+    const size_t kCount = 100;
+    const size_t kKeyMultiplier = 3U;  // must be >= 2.
+    uint32_t values[kCount];
+
+    for (size_t n = 0; n < kCount; ++n) {
+        uintptr_t key = 1U + n * kKeyMultiplier;
+        values[n] = map.add(key);
+        EXPECT_NE(0U, values[n]) << "key #" << n;
+    }
+
+    EXPECT_EQ(kCount, map.size());
+
+    for (size_t n = 0; n < kCount; ++n) {
+        uintptr_t key = 1U + n * kKeyMultiplier;
+        EXPECT_EQ(values[n], map.find(key)) << "key #" << n;
+        EXPECT_EQ(0U, map.find(key + 1U)) << "key #" << n;
+    }
+
+    for (size_t n = 0; n < kCount; ++n) {
+        uintptr_t key = 1U + n * kKeyMultiplier;
+        EXPECT_EQ(key, map.findKeyFor(values[n]));
+    }
+}
+
+TEST(UniqueIntegerMap, Del) {
+    MyMap map;
+    const size_t kCount = 100;
+    const size_t kKeyMultiplier = 3U;  // must be >= 2.
+    uint32_t values[kCount];
+
+    for (size_t n = 0; n < kCount; ++n) {
+        uintptr_t key = 1U + n * kKeyMultiplier;
+        values[n] = map.add(key);
+    }
+
+    for (size_t n = 0; n < kCount; ++n) {
+        uintptr_t key = 1U + n * kKeyMultiplier;
+        map.del(key);
+        EXPECT_EQ(kCount - 1U - n, map.size());
+        EXPECT_EQ(0U, map.find(key));
+        EXPECT_EQ(0U, map.findKeyFor(values[n]));
+    }
+
+    EXPECT_TRUE(map.empty());
+}
+
+}  // namespace emugl