opengl/libs/EGL/BlobCache_test.cpp - android_frameworks_native - Gitiles

 /*
  ** Copyright 2011, 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 <fcntl.h>
 #include <stdio.h>

 #include <memory>

 #include <gtest/gtest.h>

 #include "BlobCache.h"

 namespace android {

 template<typename T> using sp = std::shared_ptr<T>;

 class BlobCacheTest : public ::testing::Test {
 protected:

     enum {
         OK = 0,
         BAD_VALUE = -EINVAL
     };

     enum {
         MAX_KEY_SIZE = 6,
         MAX_VALUE_SIZE = 8,
         MAX_TOTAL_SIZE = 13,
     };

     virtual void SetUp() {
         mBC.reset(new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE));
     }

     virtual void TearDown() {
         mBC.reset();
     }

     std::unique_ptr<BlobCache> mBC;
 };

 TEST_F(BlobCacheTest, CacheSingleValueSucceeds) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
     ASSERT_EQ('e', buf[0]);
     ASSERT_EQ('f', buf[1]);
     ASSERT_EQ('g', buf[2]);
     ASSERT_EQ('h', buf[3]);
 }

 TEST_F(BlobCacheTest, CacheTwoValuesSucceeds) {
     unsigned char buf[2] = { 0xee, 0xee };
     mBC->set("ab", 2, "cd", 2);
     mBC->set("ef", 2, "gh", 2);
     ASSERT_EQ(size_t(2), mBC->get("ab", 2, buf, 2));
     ASSERT_EQ('c', buf[0]);
     ASSERT_EQ('d', buf[1]);
     ASSERT_EQ(size_t(2), mBC->get("ef", 2, buf, 2));
     ASSERT_EQ('g', buf[0]);
     ASSERT_EQ('h', buf[1]);
 }

 TEST_F(BlobCacheTest, GetOnlyWritesInsideBounds) {
     unsigned char buf[6] = { 0xee, 0xee, 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf+1, 4));
     ASSERT_EQ(0xee, buf[0]);
     ASSERT_EQ('e', buf[1]);
     ASSERT_EQ('f', buf[2]);
     ASSERT_EQ('g', buf[3]);
     ASSERT_EQ('h', buf[4]);
     ASSERT_EQ(0xee, buf[5]);
 }

 TEST_F(BlobCacheTest, GetOnlyWritesIfBufferIsLargeEnough) {
     unsigned char buf[3] = { 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 3));
     ASSERT_EQ(0xee, buf[0]);
     ASSERT_EQ(0xee, buf[1]);
     ASSERT_EQ(0xee, buf[2]);
 }

 TEST_F(BlobCacheTest, GetDoesntAccessNullBuffer) {
     mBC->set("abcd", 4, "efgh", 4);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, nullptr, 0));
 }

 TEST_F(BlobCacheTest, MultipleSetsCacheLatestValue) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     mBC->set("abcd", 4, "ijkl", 4);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
     ASSERT_EQ('i', buf[0]);
     ASSERT_EQ('j', buf[1]);
     ASSERT_EQ('k', buf[2]);
     ASSERT_EQ('l', buf[3]);
 }

 TEST_F(BlobCacheTest, SecondSetKeepsFirstValueIfTooLarge) {
     unsigned char buf[MAX_VALUE_SIZE+1] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
     ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
     ASSERT_EQ('e', buf[0]);
     ASSERT_EQ('f', buf[1]);
     ASSERT_EQ('g', buf[2]);
     ASSERT_EQ('h', buf[3]);
 }

 TEST_F(BlobCacheTest, DoesntCacheIfKeyIsTooBig) {
     char key[MAX_KEY_SIZE+1];
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     for (int i = 0; i < MAX_KEY_SIZE+1; i++) {
         key[i] = 'a';
     }
     mBC->set(key, MAX_KEY_SIZE+1, "bbbb", 4);
     ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE+1, buf, 4));
     ASSERT_EQ(0xee, buf[0]);
     ASSERT_EQ(0xee, buf[1]);
     ASSERT_EQ(0xee, buf[2]);
     ASSERT_EQ(0xee, buf[3]);
 }

 TEST_F(BlobCacheTest, DoesntCacheIfValueIsTooBig) {
     char buf[MAX_VALUE_SIZE+1];
     for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
         buf[i] = 'b';
     }
     mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
     for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
         buf[i] = 0xee;
     }
     ASSERT_EQ(size_t(0), mBC->get("abcd", 4, buf, MAX_VALUE_SIZE+1));
     for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
         SCOPED_TRACE(i);
         ASSERT_EQ(0xee, buf[i]);
     }
 }

 TEST_F(BlobCacheTest, DoesntCacheIfKeyValuePairIsTooBig) {
     // Check a testing assumptions
     ASSERT_TRUE(MAX_TOTAL_SIZE < MAX_KEY_SIZE + MAX_VALUE_SIZE);
     ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);

     enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE + 1 };

     char key[MAX_KEY_SIZE];
     char buf[bufSize];
     for (int i = 0; i < MAX_KEY_SIZE; i++) {
         key[i] = 'a';
     }
     for (int i = 0; i < bufSize; i++) {
         buf[i] = 'b';
     }

     mBC->set(key, MAX_KEY_SIZE, buf, MAX_VALUE_SIZE);
     ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE, nullptr, 0));
 }

 TEST_F(BlobCacheTest, CacheMaxKeySizeSucceeds) {
     char key[MAX_KEY_SIZE];
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     for (int i = 0; i < MAX_KEY_SIZE; i++) {
         key[i] = 'a';
     }
     mBC->set(key, MAX_KEY_SIZE, "wxyz", 4);
     ASSERT_EQ(size_t(4), mBC->get(key, MAX_KEY_SIZE, buf, 4));
     ASSERT_EQ('w', buf[0]);
     ASSERT_EQ('x', buf[1]);
     ASSERT_EQ('y', buf[2]);
     ASSERT_EQ('z', buf[3]);
 }

 TEST_F(BlobCacheTest, CacheMaxValueSizeSucceeds) {
     char buf[MAX_VALUE_SIZE];
     for (int i = 0; i < MAX_VALUE_SIZE; i++) {
         buf[i] = 'b';
     }
     mBC->set("abcd", 4, buf, MAX_VALUE_SIZE);
     for (int i = 0; i < MAX_VALUE_SIZE; i++) {
         buf[i] = 0xee;
     }
     ASSERT_EQ(size_t(MAX_VALUE_SIZE), mBC->get("abcd", 4, buf,
             MAX_VALUE_SIZE));
     for (int i = 0; i < MAX_VALUE_SIZE; i++) {
         SCOPED_TRACE(i);
         ASSERT_EQ('b', buf[i]);
     }
 }

 TEST_F(BlobCacheTest, CacheMaxKeyValuePairSizeSucceeds) {
     // Check a testing assumption
     ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);

     enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE };

     char key[MAX_KEY_SIZE];
     char buf[bufSize];
     for (int i = 0; i < MAX_KEY_SIZE; i++) {
         key[i] = 'a';
     }
     for (int i = 0; i < bufSize; i++) {
         buf[i] = 'b';
     }

     mBC->set(key, MAX_KEY_SIZE, buf, bufSize);
     ASSERT_EQ(size_t(bufSize), mBC->get(key, MAX_KEY_SIZE, nullptr, 0));
 }

 TEST_F(BlobCacheTest, CacheMinKeyAndValueSizeSucceeds) {
     unsigned char buf[1] = { 0xee };
     mBC->set("x", 1, "y", 1);
     ASSERT_EQ(size_t(1), mBC->get("x", 1, buf, 1));
     ASSERT_EQ('y', buf[0]);
 }

 TEST_F(BlobCacheTest, CacheSizeDoesntExceedTotalLimit) {
     for (int i = 0; i < 256; i++) {
         uint8_t k = i;
         mBC->set(&k, 1, "x", 1);
     }
     int numCached = 0;
     for (int i = 0; i < 256; i++) {
         uint8_t k = i;
         if (mBC->get(&k, 1, nullptr, 0) == 1) {
             numCached++;
         }
     }
     ASSERT_GE(MAX_TOTAL_SIZE / 2, numCached);
 }

 TEST_F(BlobCacheTest, ExceedingTotalLimitHalvesCacheSize) {
     // Fill up the entire cache with 1 char key/value pairs.
     const int maxEntries = MAX_TOTAL_SIZE / 2;
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         mBC->set(&k, 1, "x", 1);
     }
     // Insert one more entry, causing a cache overflow.
     {
         uint8_t k = maxEntries;
         mBC->set(&k, 1, "x", 1);
     }
     // Count the number of entries in the cache.
     int numCached = 0;
     for (int i = 0; i < maxEntries+1; i++) {
         uint8_t k = i;
         if (mBC->get(&k, 1, nullptr, 0) == 1) {
             numCached++;
         }
     }
     ASSERT_EQ(maxEntries/2 + 1, numCached);
 }

 class BlobCacheFlattenTest : public BlobCacheTest {
 protected:
     virtual void SetUp() {
         BlobCacheTest::SetUp();
         mBC2.reset(new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE));
     }

     virtual void TearDown() {
         mBC2.reset();
         BlobCacheTest::TearDown();
     }

     void roundTrip() {
         size_t size = mBC->getFlattenedSize();
         uint8_t* flat = new uint8_t[size];
         ASSERT_EQ(OK, mBC->flatten(flat, size));
         ASSERT_EQ(OK, mBC2->unflatten(flat, size));
         delete[] flat;
     }

     sp<BlobCache> mBC2;
 };

 TEST_F(BlobCacheFlattenTest, FlattenOneValue) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);
     roundTrip();
     ASSERT_EQ(size_t(4), mBC2->get("abcd", 4, buf, 4));
     ASSERT_EQ('e', buf[0]);
     ASSERT_EQ('f', buf[1]);
     ASSERT_EQ('g', buf[2]);
     ASSERT_EQ('h', buf[3]);
 }

 TEST_F(BlobCacheFlattenTest, FlattenFullCache) {
     // Fill up the entire cache with 1 char key/value pairs.
     const int maxEntries = MAX_TOTAL_SIZE / 2;
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         mBC->set(&k, 1, &k, 1);
     }

     roundTrip();

     // Verify the deserialized cache
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         uint8_t v = 0xee;
         ASSERT_EQ(size_t(1), mBC2->get(&k, 1, &v, 1));
         ASSERT_EQ(k, v);
     }
 }

 TEST_F(BlobCacheFlattenTest, FlattenDoesntChangeCache) {
     // Fill up the entire cache with 1 char key/value pairs.
     const int maxEntries = MAX_TOTAL_SIZE / 2;
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         mBC->set(&k, 1, &k, 1);
     }

     size_t size = mBC->getFlattenedSize();
     uint8_t* flat = new uint8_t[size];
     ASSERT_EQ(OK, mBC->flatten(flat, size));
     delete[] flat;

     // Verify the cache that we just serialized
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         uint8_t v = 0xee;
         ASSERT_EQ(size_t(1), mBC->get(&k, 1, &v, 1));
         ASSERT_EQ(k, v);
     }
 }

 TEST_F(BlobCacheFlattenTest, FlattenCatchesBufferTooSmall) {
     // Fill up the entire cache with 1 char key/value pairs.
     const int maxEntries = MAX_TOTAL_SIZE / 2;
     for (int i = 0; i < maxEntries; i++) {
         uint8_t k = i;
         mBC->set(&k, 1, &k, 1);
     }

     size_t size = mBC->getFlattenedSize() - 1;
     uint8_t* flat = new uint8_t[size];
     // ASSERT_EQ(BAD_VALUE, mBC->flatten(flat, size));
     // TODO: The above fails. I expect this is so because getFlattenedSize()
     // overstimates the size by using PROPERTY_VALUE_MAX.
     delete[] flat;
 }

 TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadMagic) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);

     size_t size = mBC->getFlattenedSize();
     uint8_t* flat = new uint8_t[size];
     ASSERT_EQ(OK, mBC->flatten(flat, size));
     flat[1] = ~flat[1];

     // Bad magic should cause an error.
     ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size));
     delete[] flat;

     // The error should cause the unflatten to result in an empty cache
     ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
 }

 TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheVersion) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);

     size_t size = mBC->getFlattenedSize();
     uint8_t* flat = new uint8_t[size];
     ASSERT_EQ(OK, mBC->flatten(flat, size));
     flat[5] = ~flat[5];

     // Version mismatches shouldn't cause errors, but should not use the
     // serialized entries
     ASSERT_EQ(OK, mBC2->unflatten(flat, size));
     delete[] flat;

     // The version mismatch should cause the unflatten to result in an empty
     // cache
     ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
 }

 TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheDeviceVersion) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);

     size_t size = mBC->getFlattenedSize();
     uint8_t* flat = new uint8_t[size];
     ASSERT_EQ(OK, mBC->flatten(flat, size));
     flat[10] = ~flat[10];

     // Version mismatches shouldn't cause errors, but should not use the
     // serialized entries
     ASSERT_EQ(OK, mBC2->unflatten(flat, size));
     delete[] flat;

     // The version mismatch should cause the unflatten to result in an empty
     // cache
     ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
 }

 TEST_F(BlobCacheFlattenTest, UnflattenCatchesBufferTooSmall) {
     unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
     mBC->set("abcd", 4, "efgh", 4);

     size_t size = mBC->getFlattenedSize();
     uint8_t* flat = new uint8_t[size];
     ASSERT_EQ(OK, mBC->flatten(flat, size));

     // A buffer truncation shouldt cause an error
     // ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size-1));
     // TODO: The above appears to fail because getFlattenedSize() is
     // conservative.
     delete[] flat;

     // The error should cause the unflatten to result in an empty cache
     ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
 }

 } // namespace android
	/*
	** Copyright 2011, 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 <fcntl.h>
	#include <stdio.h>

	#include <memory>

	#include <gtest/gtest.h>

	#include "BlobCache.h"

	namespace android {

	template<typename T> using sp = std::shared_ptr<T>;

	class BlobCacheTest : public ::testing::Test {
	protected:

	enum {
	OK = 0,
	BAD_VALUE = -EINVAL
	};

	enum {
	MAX_KEY_SIZE = 6,
	MAX_VALUE_SIZE = 8,
	MAX_TOTAL_SIZE = 13,
	};

	virtual void SetUp() {
	mBC.reset(new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE));
	}

	virtual void TearDown() {
	mBC.reset();
	}

	std::unique_ptr<BlobCache> mBC;
	};

	TEST_F(BlobCacheTest, CacheSingleValueSucceeds) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
	ASSERT_EQ('e', buf[0]);
	ASSERT_EQ('f', buf[1]);
	ASSERT_EQ('g', buf[2]);
	ASSERT_EQ('h', buf[3]);
	}

	TEST_F(BlobCacheTest, CacheTwoValuesSucceeds) {
	unsigned char buf[2] = { 0xee, 0xee };
	mBC->set("ab", 2, "cd", 2);
	mBC->set("ef", 2, "gh", 2);
	ASSERT_EQ(size_t(2), mBC->get("ab", 2, buf, 2));
	ASSERT_EQ('c', buf[0]);
	ASSERT_EQ('d', buf[1]);
	ASSERT_EQ(size_t(2), mBC->get("ef", 2, buf, 2));
	ASSERT_EQ('g', buf[0]);
	ASSERT_EQ('h', buf[1]);
	}

	TEST_F(BlobCacheTest, GetOnlyWritesInsideBounds) {
	unsigned char buf[6] = { 0xee, 0xee, 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf+1, 4));
	ASSERT_EQ(0xee, buf[0]);
	ASSERT_EQ('e', buf[1]);
	ASSERT_EQ('f', buf[2]);
	ASSERT_EQ('g', buf[3]);
	ASSERT_EQ('h', buf[4]);
	ASSERT_EQ(0xee, buf[5]);
	}

	TEST_F(BlobCacheTest, GetOnlyWritesIfBufferIsLargeEnough) {
	unsigned char buf[3] = { 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 3));
	ASSERT_EQ(0xee, buf[0]);
	ASSERT_EQ(0xee, buf[1]);
	ASSERT_EQ(0xee, buf[2]);
	}

	TEST_F(BlobCacheTest, GetDoesntAccessNullBuffer) {
	mBC->set("abcd", 4, "efgh", 4);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, nullptr, 0));
	}

	TEST_F(BlobCacheTest, MultipleSetsCacheLatestValue) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	mBC->set("abcd", 4, "ijkl", 4);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
	ASSERT_EQ('i', buf[0]);
	ASSERT_EQ('j', buf[1]);
	ASSERT_EQ('k', buf[2]);
	ASSERT_EQ('l', buf[3]);
	}

	TEST_F(BlobCacheTest, SecondSetKeepsFirstValueIfTooLarge) {
	unsigned char buf[MAX_VALUE_SIZE+1] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
	ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
	ASSERT_EQ('e', buf[0]);
	ASSERT_EQ('f', buf[1]);
	ASSERT_EQ('g', buf[2]);
	ASSERT_EQ('h', buf[3]);
	}

	TEST_F(BlobCacheTest, DoesntCacheIfKeyIsTooBig) {
	char key[MAX_KEY_SIZE+1];
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	for (int i = 0; i < MAX_KEY_SIZE+1; i++) {
	key[i] = 'a';
	}
	mBC->set(key, MAX_KEY_SIZE+1, "bbbb", 4);
	ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE+1, buf, 4));
	ASSERT_EQ(0xee, buf[0]);
	ASSERT_EQ(0xee, buf[1]);
	ASSERT_EQ(0xee, buf[2]);
	ASSERT_EQ(0xee, buf[3]);
	}

	TEST_F(BlobCacheTest, DoesntCacheIfValueIsTooBig) {
	char buf[MAX_VALUE_SIZE+1];
	for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
	buf[i] = 'b';
	}
	mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
	for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
	buf[i] = 0xee;
	}
	ASSERT_EQ(size_t(0), mBC->get("abcd", 4, buf, MAX_VALUE_SIZE+1));
	for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
	SCOPED_TRACE(i);
	ASSERT_EQ(0xee, buf[i]);
	}
	}

	TEST_F(BlobCacheTest, DoesntCacheIfKeyValuePairIsTooBig) {
	// Check a testing assumptions
	ASSERT_TRUE(MAX_TOTAL_SIZE < MAX_KEY_SIZE + MAX_VALUE_SIZE);
	ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);

	enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE + 1 };

	char key[MAX_KEY_SIZE];
	char buf[bufSize];
	for (int i = 0; i < MAX_KEY_SIZE; i++) {
	key[i] = 'a';
	}
	for (int i = 0; i < bufSize; i++) {
	buf[i] = 'b';
	}

	mBC->set(key, MAX_KEY_SIZE, buf, MAX_VALUE_SIZE);
	ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE, nullptr, 0));
	}

	TEST_F(BlobCacheTest, CacheMaxKeySizeSucceeds) {
	char key[MAX_KEY_SIZE];
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	for (int i = 0; i < MAX_KEY_SIZE; i++) {
	key[i] = 'a';
	}
	mBC->set(key, MAX_KEY_SIZE, "wxyz", 4);
	ASSERT_EQ(size_t(4), mBC->get(key, MAX_KEY_SIZE, buf, 4));
	ASSERT_EQ('w', buf[0]);
	ASSERT_EQ('x', buf[1]);
	ASSERT_EQ('y', buf[2]);
	ASSERT_EQ('z', buf[3]);
	}

	TEST_F(BlobCacheTest, CacheMaxValueSizeSucceeds) {
	char buf[MAX_VALUE_SIZE];
	for (int i = 0; i < MAX_VALUE_SIZE; i++) {
	buf[i] = 'b';
	}
	mBC->set("abcd", 4, buf, MAX_VALUE_SIZE);
	for (int i = 0; i < MAX_VALUE_SIZE; i++) {
	buf[i] = 0xee;
	}
	ASSERT_EQ(size_t(MAX_VALUE_SIZE), mBC->get("abcd", 4, buf,
	MAX_VALUE_SIZE));
	for (int i = 0; i < MAX_VALUE_SIZE; i++) {
	SCOPED_TRACE(i);
	ASSERT_EQ('b', buf[i]);
	}
	}

	TEST_F(BlobCacheTest, CacheMaxKeyValuePairSizeSucceeds) {
	// Check a testing assumption
	ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);

	enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE };

	char key[MAX_KEY_SIZE];
	char buf[bufSize];
	for (int i = 0; i < MAX_KEY_SIZE; i++) {
	key[i] = 'a';
	}
	for (int i = 0; i < bufSize; i++) {
	buf[i] = 'b';
	}

	mBC->set(key, MAX_KEY_SIZE, buf, bufSize);
	ASSERT_EQ(size_t(bufSize), mBC->get(key, MAX_KEY_SIZE, nullptr, 0));
	}

	TEST_F(BlobCacheTest, CacheMinKeyAndValueSizeSucceeds) {
	unsigned char buf[1] = { 0xee };
	mBC->set("x", 1, "y", 1);
	ASSERT_EQ(size_t(1), mBC->get("x", 1, buf, 1));
	ASSERT_EQ('y', buf[0]);
	}

	TEST_F(BlobCacheTest, CacheSizeDoesntExceedTotalLimit) {
	for (int i = 0; i < 256; i++) {
	uint8_t k = i;
	mBC->set(&k, 1, "x", 1);
	}
	int numCached = 0;
	for (int i = 0; i < 256; i++) {
	uint8_t k = i;
	if (mBC->get(&k, 1, nullptr, 0) == 1) {
	numCached++;
	}
	}
	ASSERT_GE(MAX_TOTAL_SIZE / 2, numCached);
	}

	TEST_F(BlobCacheTest, ExceedingTotalLimitHalvesCacheSize) {
	// Fill up the entire cache with 1 char key/value pairs.
	const int maxEntries = MAX_TOTAL_SIZE / 2;
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	mBC->set(&k, 1, "x", 1);
	}
	// Insert one more entry, causing a cache overflow.
	{
	uint8_t k = maxEntries;
	mBC->set(&k, 1, "x", 1);
	}
	// Count the number of entries in the cache.
	int numCached = 0;
	for (int i = 0; i < maxEntries+1; i++) {
	uint8_t k = i;
	if (mBC->get(&k, 1, nullptr, 0) == 1) {
	numCached++;
	}
	}
	ASSERT_EQ(maxEntries/2 + 1, numCached);
	}

	class BlobCacheFlattenTest : public BlobCacheTest {
	protected:
	virtual void SetUp() {
	BlobCacheTest::SetUp();
	mBC2.reset(new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE));
	}

	virtual void TearDown() {
	mBC2.reset();
	BlobCacheTest::TearDown();
	}

	void roundTrip() {
	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));
	ASSERT_EQ(OK, mBC2->unflatten(flat, size));
	delete[] flat;
	}

	sp<BlobCache> mBC2;
	};

	TEST_F(BlobCacheFlattenTest, FlattenOneValue) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);
	roundTrip();
	ASSERT_EQ(size_t(4), mBC2->get("abcd", 4, buf, 4));
	ASSERT_EQ('e', buf[0]);
	ASSERT_EQ('f', buf[1]);
	ASSERT_EQ('g', buf[2]);
	ASSERT_EQ('h', buf[3]);
	}

	TEST_F(BlobCacheFlattenTest, FlattenFullCache) {
	// Fill up the entire cache with 1 char key/value pairs.
	const int maxEntries = MAX_TOTAL_SIZE / 2;
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	mBC->set(&k, 1, &k, 1);
	}

	roundTrip();

	// Verify the deserialized cache
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	uint8_t v = 0xee;
	ASSERT_EQ(size_t(1), mBC2->get(&k, 1, &v, 1));
	ASSERT_EQ(k, v);
	}
	}

	TEST_F(BlobCacheFlattenTest, FlattenDoesntChangeCache) {
	// Fill up the entire cache with 1 char key/value pairs.
	const int maxEntries = MAX_TOTAL_SIZE / 2;
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	mBC->set(&k, 1, &k, 1);
	}

	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));
	delete[] flat;

	// Verify the cache that we just serialized
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	uint8_t v = 0xee;
	ASSERT_EQ(size_t(1), mBC->get(&k, 1, &v, 1));
	ASSERT_EQ(k, v);
	}
	}

	TEST_F(BlobCacheFlattenTest, FlattenCatchesBufferTooSmall) {
	// Fill up the entire cache with 1 char key/value pairs.
	const int maxEntries = MAX_TOTAL_SIZE / 2;
	for (int i = 0; i < maxEntries; i++) {
	uint8_t k = i;
	mBC->set(&k, 1, &k, 1);
	}

	size_t size = mBC->getFlattenedSize() - 1;
	uint8_t* flat = new uint8_t[size];
	// ASSERT_EQ(BAD_VALUE, mBC->flatten(flat, size));
	// TODO: The above fails. I expect this is so because getFlattenedSize()
	// overstimates the size by using PROPERTY_VALUE_MAX.
	delete[] flat;
	}

	TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadMagic) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);

	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));
	flat[1] = ~flat[1];

	// Bad magic should cause an error.
	ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size));
	delete[] flat;

	// The error should cause the unflatten to result in an empty cache
	ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
	}

	TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheVersion) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);

	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));
	flat[5] = ~flat[5];

	// Version mismatches shouldn't cause errors, but should not use the
	// serialized entries
	ASSERT_EQ(OK, mBC2->unflatten(flat, size));
	delete[] flat;

	// The version mismatch should cause the unflatten to result in an empty
	// cache
	ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
	}

	TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheDeviceVersion) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);

	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));
	flat[10] = ~flat[10];

	// Version mismatches shouldn't cause errors, but should not use the
	// serialized entries
	ASSERT_EQ(OK, mBC2->unflatten(flat, size));
	delete[] flat;

	// The version mismatch should cause the unflatten to result in an empty
	// cache
	ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
	}

	TEST_F(BlobCacheFlattenTest, UnflattenCatchesBufferTooSmall) {
	unsigned char buf[4] = { 0xee, 0xee, 0xee, 0xee };
	mBC->set("abcd", 4, "efgh", 4);

	size_t size = mBC->getFlattenedSize();
	uint8_t* flat = new uint8_t[size];
	ASSERT_EQ(OK, mBC->flatten(flat, size));

	// A buffer truncation shouldt cause an error
	// ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size-1));
	// TODO: The above appears to fail because getFlattenedSize() is
	// conservative.
	delete[] flat;

	// The error should cause the unflatten to result in an empty cache
	ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
	}

	} // namespace android