How should I initial the length for dest byte[] when i don't know the decompressed length

[zhangjiajie023]

byte[] restored = new byte[decompressedLength]; // - method 2: when the compressed length is known (a little slower) // the destination buffer needs to be over-sized LZ4SafeDecompressor decompressor2 = factory.safeDecompressor(); int decompressedLength2 = decompressor2.decompress(compressed, 0, compressedLength, restored, 0);

this example has initial a correct length for restored to decompress.

But when i don't know the decompressed length, how should I initial the length fordest byte[]?

I tried to byte[] restored = new byte[1]; failed, definitely; I used the decompress(ByteBuffer src, ByteBuffer dest), initial the capacity of dest to be 1, failed too;

so the dest must be set a longer length than it should be, right? could u tell me how to use the safeDecompress(..)? tks for your answer

[zhangjiajie023]

Someone suggested that set the dest.length to be src.length * 3 or more, is it suitable, or any other better solution ?

[odaira]

There is no easy way to guess the decompressed length in lz4. The maximum possible compression ratio is 255, but it is too large for the decompressed buffer allocation.

[darouwan]

I meet the same problem. LZ4BlockInputStream may solve your problem as stream can be read in multi times.

[odaira]

You can also use LZ4FrameInputStream (1.4.0 or later) or LZ4DecompressorWithLength (1.5.0 or later). Please reopen this issue if you need further assistance.