Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/compressor/zstd/ZstdCompressor.h b/src/compressor/zstd/ZstdCompressor.h
new file mode 100644
index 00000000..83508b93
--- /dev/null
+++ b/src/compressor/zstd/ZstdCompressor.h
@@ -0,0 +1,106 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 Haomai Wang <haomaiwang@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_ZSTDCOMPRESSOR_H
+#define CEPH_ZSTDCOMPRESSOR_H
+
+#define ZSTD_STATIC_LINKING_ONLY
+#include "zstd/lib/zstd.h"
+
+#include "include/buffer.h"
+#include "include/encoding.h"
+#include "compressor/Compressor.h"
+
+class ZstdCompressor : public Compressor {
+ public:
+  ZstdCompressor(CephContext *cct) : Compressor(COMP_ALG_ZSTD, "zstd"), cct(cct) {}
+
+  int compress(const bufferlist &src, bufferlist &dst) override {
+    ZSTD_CStream *s = ZSTD_createCStream();
+    ZSTD_initCStream_srcSize(s, cct->_conf->compressor_zstd_level, src.length());
+    auto p = src.begin();
+    size_t left = src.length();
+
+    size_t const out_max = ZSTD_compressBound(left);
+    bufferptr outptr = buffer::create_small_page_aligned(out_max);
+    ZSTD_outBuffer_s outbuf;
+    outbuf.dst = outptr.c_str();
+    outbuf.size = outptr.length();
+    outbuf.pos = 0;
+
+    while (left) {
+      ceph_assert(!p.end());
+      struct ZSTD_inBuffer_s inbuf;
+      inbuf.pos = 0;
+      inbuf.size = p.get_ptr_and_advance(left, (const char**)&inbuf.src);
+      left -= inbuf.size;
+      ZSTD_EndDirective const zed = (left==0) ? ZSTD_e_end : ZSTD_e_continue;
+      size_t r = ZSTD_compress_generic(s, &outbuf, &inbuf, zed);
+      if (ZSTD_isError(r)) {
+	return -EINVAL;
+      }
+    }
+    ceph_assert(p.end());
+
+    ZSTD_freeCStream(s);
+
+    // prefix with decompressed length
+    encode((uint32_t)src.length(), dst);
+    dst.append(outptr, 0, outbuf.pos);
+    return 0;
+  }
+
+  int decompress(const bufferlist &src, bufferlist &dst) override {
+    auto i = std::cbegin(src);
+    return decompress(i, src.length(), dst);
+  }
+
+  int decompress(bufferlist::const_iterator &p,
+		 size_t compressed_len,
+		 bufferlist &dst) override {
+    if (compressed_len < 4) {
+      return -1;
+    }
+    compressed_len -= 4;
+    uint32_t dst_len;
+    decode(dst_len, p);
+
+    bufferptr dstptr(dst_len);
+    ZSTD_outBuffer_s outbuf;
+    outbuf.dst = dstptr.c_str();
+    outbuf.size = dstptr.length();
+    outbuf.pos = 0;
+    ZSTD_DStream *s = ZSTD_createDStream();
+    ZSTD_initDStream(s);
+    while (compressed_len > 0) {
+      if (p.end()) {
+	return -1;
+      }
+      ZSTD_inBuffer_s inbuf;
+      inbuf.pos = 0;
+      inbuf.size = p.get_ptr_and_advance(compressed_len,
+					 (const char**)&inbuf.src);
+      ZSTD_decompressStream(s, &outbuf, &inbuf);
+      compressed_len -= inbuf.size;
+    }
+    ZSTD_freeDStream(s);
+
+    dst.append(dstptr, 0, outbuf.pos);
+    return 0;
+  }
+ private:
+  CephContext *const cct;
+};
+
+#endif