add compress base UDF

1 files changed, 40 insertions, 0 deletions

diff --git a/library/cpp/streams/xz/decompress.h b/library/cpp/streams/xz/decompress.h
new file mode 100644
index 0000000000..8389cbdaf9
--- /dev/null
+++ b/library/cpp/streams/xz/decompress.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <util/stream/buffered.h>
+#include <util/stream/input.h>
+
+class IZeroCopyInput;
+
+/**
+ * Unbuffered decompressing stream for .XZ and .LZMA files.
+ *
+ * Do not use it for reading in small pieces.
+ */
+class TUnbufferedXzDecompress: public IInputStream {
+public:
+    TUnbufferedXzDecompress(IInputStream* slave);
+    TUnbufferedXzDecompress(IZeroCopyInput* slave);
+    ~TUnbufferedXzDecompress() override;
+
+private:
+    size_t DoRead(void* buf, size_t len) override;
+
+private:
+    class TImpl;
+    std::unique_ptr<TImpl> Impl_;
+};
+
+/**
+ * Buffered decompressing stream for .XZ and .LZMA files.
+ *
+ * Supports efficient `ReadLine` calls and similar "reading in small pieces"
+ * usage patterns.
+ */
+class TXzDecompress: public TBuffered<TUnbufferedXzDecompress> {
+public:
+    template <class T>
+    inline TXzDecompress(T&& t, size_t buf = 1 << 13)
+        : TBuffered<TUnbufferedXzDecompress>(buf, std::forward<T>(t))
+    {
+    }
+};