File leveldb-compressed-output-size.patch of Package leveldb

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File leveldb-compressed-output-size.patch of Package leveldb

diff --git a/table/table_test.cc b/table/table_test.cc
index c723bf84c..abf6e246f 100644
--- a/table/table_test.cc
+++ b/table/table_test.cc
@@ -853,12 +853,20 @@ TEST(TableTest, ApproximateOffsetOfCompressed) {
   options.compression = kSnappyCompression;
   c.Finish(options, &keys, &kvmap);
 
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"),       0,      0));
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"),       0,      0));
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"),       0,      0));
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"),    2000,   3000));
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"),    2000,   3000));
-  ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"),    4000,   6000));
+  // Expected upper and lower bounds of space used by compressible strings.
+  static const int kSlop = 1000;  // Compressor effectiveness varies.
+  const int expected = 2500;  // 10000 * compression ratio (0.25)
+  const int min_z = expected - kSlop;
+  const int max_z = expected + kSlop;
+
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, kSlop));
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, kSlop));
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, kSlop));
+  // Have now emitted a large compressible string, so adjust expected offset.
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), min_z, max_z));
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), min_z, max_z));
+  // Have now emitted two large compressible strings, so adjust expected offset.
+  ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 2 * min_z, 2 * max_z));
 }
 
 }  // namespace leveldb

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File leveldb-compressed-output-size.patch of Package leveldb

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