1 files changed, 99 insertions, 0 deletions
diff --git a/libmariadb/plugins/compress/c_zlib.c b/libmariadb/plugins/compress/c_zlib.c
new file mode 100644
index 00000000..a031841d
--- /dev/null
+++ b/libmariadb/plugins/compress/c_zlib.c
@@ -0,0 +1,99 @@
+/************************************************************************************
+   Copyright (C) 2022 MariaDB Corporation AB
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not see <http://www.gnu.org/licenses>
+   or write to the Free Software Foundation, Inc.,
+   51 Franklin St., Fifth Floor, Boston, MA 02110, USA
+
+*************************************************************************************/
+
+#include <ma_global.h>
+#include <ma_sys.h>
+#include <mysql.h>
+#include <mysql/client_plugin.h>
+#include <string.h>
+#include <memory.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <zlib.h>
+
+static ma_compress_ctx *ma_zlib_ctx_init(int compression_level)
+{
+  ma_compress_ctx *ctx;
+
+  if (!(ctx = (ma_compress_ctx *)calloc(1, sizeof(ma_compress_ctx))))
+    return NULL;
+
+  ctx->compression_level= (compression_level == COMPRESSION_LEVEL_DEFAULT) ?
+                          Z_DEFAULT_COMPRESSION : compression_level;
+  return ctx;
+}
+
+static void ma_zlib_ctx_deinit(ma_compress_ctx *ctx)
+{
+    free(ctx);
+}
+
+my_bool ma_zlib_compress(ma_compress_ctx *ctx, void *dst,
+                         size_t *dst_len, void *source, size_t source_len)
+{
+  int rc;
+  if (!ctx)
+    return 1;
+
+  if ((rc= compress2((Bytef *)dst, (uLongf *)dst_len, (Bytef *)source, (uLong)source_len,
+                   ctx->compression_level)) != Z_OK)
+    return 1;
+  return 0;
+}
+
+my_bool ma_zlib_decompress(ma_compress_ctx *ctx, void *dst, size_t *dst_len, 
+                           void *source, size_t *source_len)
+{
+  int rc;
+  if (!ctx)
+    return 1;
+
+  rc= uncompress((Bytef*) dst, (uLongf *)dst_len, (Bytef*) source, (uLongf)*source_len);
+
+  if (rc != Z_OK)
+    return 1;
+
+  return 0;
+}
+
+#ifndef PLUGIN_DYNAMIC
+MARIADB_COMPRESSION_PLUGIN zlib_client_plugin=
+#else
+MARIADB_COMPRESSION_PLUGIN _mysql_client_plugin_declaration_ =
+#endif
+{
+  MARIADB_CLIENT_COMPRESSION_PLUGIN,
+  MARIADB_CLIENT_COMPRESSION_PLUGIN_INTERFACE_VERSION,
+  "zlib",
+  "Georg Richter",
+  "zlib compresson plugin",
+  {0,1,0},
+  "LGPL",
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  ma_zlib_ctx_init,
+  ma_zlib_ctx_deinit,
+  ma_zlib_compress,
+  ma_zlib_decompress,
+mysql_end_client_plugin;
+