1 files changed, 77 insertions, 0 deletions
diff --git a/trace/record/record-filter-zlib.cc b/trace/record/record-filter-zlib.cc
new file mode 100644
index 0000000..87b2cfe
--- /dev/null
+++ b/trace/record/record-filter-zlib.cc
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/*
+ * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_ZLIB_H
+
+#include "client.h"
+
+ZlibFilter::ZlibFilter() : buffer_(65536)
+{
+  inflateInit(&stream_);
+}
+
+ZlibFilter::~ZlibFilter()
+{
+  inflateEnd(&stream_);
+}
+
+bool ZlibFilter::Run(void** buf, size_t* n) {
+  stream_.next_in = static_cast<unsigned char*>(*buf);
+  stream_.avail_in = *n;
+  stream_.next_out = &buffer_[0];
+  size_t avail_out = 0;
+  size_t buffer_size = buffer_.size();
+  size_t chunk_size = buffer_size;
+  stream_.avail_out = buffer_size;
+
+  while (true) {
+    int err = inflate(&stream_, Z_NO_FLUSH);
+    if (err != Z_OK && err != Z_STREAM_END) {
+      return false;
+    }
+
+    if (stream_.avail_in > 0) {
+      chunk_size = buffer_size;
+      buffer_size *= 2;
+      buffer_.resize(buffer_size);
+      stream_.next_out = reinterpret_cast<Bytef*>(&buffer_[chunk_size]);
+      stream_.avail_out = chunk_size;
+      avail_out += chunk_size;
+      continue;
+    }
+
+    *buf = &buffer_[0];
+    *n = avail_out + chunk_size - stream_.avail_out;
+    return true;
+  }
+}
+
+#endif  // HAVE_ZLIB_H