[GitHub] [iotdb] shuwenwei commented on a diff in pull request #9231: [IOTDB-2569]Support ZSTD Compression

Wed, 08 Mar 2023 00:26:57 -0800 


shuwenwei commented on code in PR #9231:
URL: https://github.com/apache/iotdb/pull/9231#discussion_r1129106015


##########
tsfile/src/main/java/org/apache/iotdb/tsfile/compress/IUnCompressor.java:
##########
@@ -312,4 +315,45 @@ public CompressionType getCodecName() {
       return CompressionType.GZIP;
     }
   }
+
+  class ZstdUnCompressor implements IUnCompressor {
+
+    @Override
+    public int getUncompressedLength(byte[] array, int offset, int length) 
throws IOException {
+      return (int) Zstd.decompressedSize(array, offset, length);

Review Comment:
   It looks like the size is saved in the header.
   
![image](https://user-images.githubusercontent.com/55970239/223661109-c1f64cc2-55d7-4563-8a95-7950c5231892.png)
   
![image](https://user-images.githubusercontent.com/55970239/223661110-247c64dd-4781-4600-a521-2512aedd12d5.png)
   



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