1 files changed, 95 insertions, 0 deletions
diff --git a/src/compressor/brotli/BrotliCompressor.cc b/src/compressor/brotli/BrotliCompressor.cc
new file mode 100644
index 00000000..27685da3
--- /dev/null
+++ b/src/compressor/brotli/BrotliCompressor.cc
@@ -0,0 +1,95 @@
+#include "brotli/encode.h"
+#include "brotli/decode.h"
+#include "BrotliCompressor.h"
+#include "include/scope_guard.h"
+
+#define MAX_LEN (CEPH_PAGE_SIZE)
+
+int BrotliCompressor::compress(const bufferlist &in, bufferlist &out) 
+{
+  BrotliEncoderState* s = BrotliEncoderCreateInstance(nullptr,
+                                                      nullptr,
+                                                      nullptr);
+  if (!s) {
+    return -1;
+  }
+  auto sg = make_scope_guard([&s] { BrotliEncoderDestroyInstance(s); });
+  BrotliEncoderSetParameter(s, BROTLI_PARAM_QUALITY, (uint32_t)9);
+  BrotliEncoderSetParameter(s, BROTLI_PARAM_LGWIN, 22);
+  for (auto i = in.buffers().begin(); i != in.buffers().end();) {
+    size_t available_in = i->length();
+    size_t max_comp_size = BrotliEncoderMaxCompressedSize(available_in);
+    size_t available_out =  max_comp_size;
+    bufferptr ptr = buffer::create_small_page_aligned(max_comp_size);
+    uint8_t* next_out = (uint8_t*)ptr.c_str();
+    const uint8_t* next_in = (uint8_t*)i->c_str();
+    ++i;
+    BrotliEncoderOperation finish = i != in.buffers().end() ?
+                                         BROTLI_OPERATION_PROCESS :
+                                         BROTLI_OPERATION_FINISH;
+    do {
+      if (!BrotliEncoderCompressStream(s,
+                                       finish,
+                                       &available_in,
+                                       &next_in,
+                                       &available_out,
+                                       &next_out,
+                                       nullptr)) {
+        return -1;
+      }
+      unsigned have = max_comp_size - available_out;
+      out.append(ptr, 0, have);
+    } while (available_out == 0);
+    if (BrotliEncoderIsFinished(s)) {
+      break;
+    }
+  }
+  return 0;
+}
+
+int BrotliCompressor::decompress(bufferlist::const_iterator &p,
+                                 size_t compressed_size,
+                                 bufferlist &out) 
+{
+  BrotliDecoderState* s = BrotliDecoderCreateInstance(nullptr,
+                                                      nullptr,
+                                                      nullptr);
+  if (!s) {
+    return -1;
+  }
+  auto sg = make_scope_guard([&s] { BrotliDecoderDestroyInstance(s); });
+  size_t remaining = std::min<size_t>(p.get_remaining(), compressed_size);
+  while (remaining) {
+    const uint8_t* next_in;
+    size_t len = p.get_ptr_and_advance(remaining, (const char**)&next_in);
+    remaining -= len;
+    size_t available_in = len;
+    BrotliDecoderResult result = BROTLI_DECODER_RESULT_ERROR;
+    do {
+      size_t available_out = MAX_LEN;
+      bufferptr ptr = buffer::create_page_aligned(MAX_LEN);
+      uint8_t* next_out = (uint8_t*)ptr.c_str();
+      result = BrotliDecoderDecompressStream(s,
+                                             &available_in,
+                                             &next_in,
+                                             &available_out,
+                                             &next_out,
+                                             0);
+      if (!result) {
+        return -1;
+      }
+      unsigned have = MAX_LEN - available_out;
+      out.append(ptr, 0, have);
+    } while (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT);
+    if (BrotliDecoderIsFinished(s)) {
+      break;
+    }
+  }
+  return 0;
+}
+
+int BrotliCompressor::decompress(const bufferlist &in, bufferlist &out) 
+{  
+  auto i = std::cbegin(in);
+  return decompress(i, in.length(), out);
+}