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Merge "Fix numerical overflow in result in computeStorageCacheBytes"

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This commit is contained in:
Neharika Jali
2022-01-06 11:23:19 +00:00
committed by Android (Google) Code Review
parent 144be64a1b 4bf22b5e9a
commit 1d55f7bf2d
2 changed files with 6 additions and 5 deletions
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9
core/java/android/os/storage/StorageManager.java
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@@ -1525,10 +1525,11 @@ public class StorageManager {
result = totalBytes * CACHE_RESERVE_PERCENT_LOW / 100;
} else {
// Else, linearly interpolate the amount of space to reserve
result = ((CACHE_RESERVE_PERCENT_HIGH - CACHE_RESERVE_PERCENT_LOW)
* (usableBytes - storageThresholdHighBytes) + CACHE_RESERVE_PERCENT_HIGH
* (storageThresholdHighBytes - storageThresholdLowBytes)) * totalBytes
/ (100 * (storageThresholdHighBytes - storageThresholdLowBytes));
double slope = (CACHE_RESERVE_PERCENT_HIGH - CACHE_RESERVE_PERCENT_LOW) * totalBytes
/ (100.0 * (storageThresholdHighBytes - storageThresholdLowBytes));
double intercept = totalBytes * CACHE_RESERVE_PERCENT_LOW / 100.0
- storageThresholdLowBytes * slope;
result = Math.round(slope * usableBytes + intercept);
}
return result;
}

2
core/tests/coretests/src/android/os/storage/StorageManagerBaseTest.java
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@@ -170,7 +170,7 @@ public class StorageManagerBaseTest extends InstrumentationTestCase {
when(mFile.getUsableSpace()).thenReturn(10000L);
when(mFile.getTotalSpace()).thenReturn(100000L);
long result = mSm.getStorageCacheBytes(mFile, 0);
assertThat(result).isEqualTo(4666L);
assertThat(result).isEqualTo(4667L);
}
/**