temporary add library/cpp/streams/factory/open_by_signature to export

e7cda406ffefb716562a9a7ba46607dff026f1c1

1 files changed, 35 insertions, 0 deletions

diff --git a/library/cpp/streams/lz/lz4/block.h b/library/cpp/streams/lz/lz4/block.h
new file mode 100644
index 0000000000..9a912c0be2
--- /dev/null
+++ b/library/cpp/streams/lz/lz4/block.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <library/cpp/streams/lz/common/compressor.h>
+
+#include <contrib/libs/lz4/lz4.h>
+
+/*
+ * LZ4
+ */
+class TLZ4 {
+public:
+    static constexpr char signature[]= "LZ.4";
+
+    static inline size_t Hint(size_t len) noexcept {
+        return Max<size_t>((size_t)(len * 1.06), 100);
+    }
+
+    inline size_t Compress(const char* data, size_t len, char* ptr, size_t dstMaxSize) {
+        return LZ4_compress_default(data, ptr, len, dstMaxSize);
+    }
+
+    inline size_t Decompress(const char* data, size_t len, char* ptr, size_t max) {
+        int res = LZ4_decompress_safe(data, ptr, len, max);
+        if (res < 0)
+            ythrow TDecompressorError();
+        return res;
+    }
+
+    inline void InitFromStream(IInputStream*) const noexcept {
+    }
+
+    static inline bool SaveIncompressibleChunks() noexcept {
+        return false;
+    }
+};