From 43d743e75b7b747341b9a5c36a933b490548bebb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Sat, 4 Nov 2017 01:17:16 +0300
Subject: Add implementation

---
 mysql/libmariadb/ma_compress.c | 90 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 mysql/libmariadb/ma_compress.c

(limited to 'mysql/libmariadb/ma_compress.c')

diff --git a/mysql/libmariadb/ma_compress.c b/mysql/libmariadb/ma_compress.c
new file mode 100644
index 0000000..55184a0
--- /dev/null
+++ b/mysql/libmariadb/ma_compress.c
@@ -0,0 +1,90 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+                 2016 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, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02111-1301, USA */
+
+/* Written by Sinisa Milivojevic <sinisa@coresinc.com> */
+
+#include <ma_global.h>
+#ifdef HAVE_COMPRESS
+#include <ma_sys.h>
+#include <ma_string.h>
+#include <zlib.h>
+
+/*
+** This replaces the packet with a compressed packet
+** Returns 1 on error
+** *complen is 0 if the packet wasn't compressed
+*/
+
+my_bool _mariadb_compress(unsigned char *packet, size_t *len, size_t *complen)
+{
+  if (*len < MIN_COMPRESS_LENGTH)
+    *complen=0;
+  else
+  {
+    unsigned char *compbuf=_mariadb_compress_alloc(packet,len,complen);
+    if (!compbuf)
+      return *complen ? 0 : 1;
+    memcpy(packet,compbuf,*len);
+    free(compbuf);
+  }
+  return 0;
+}
+
+
+unsigned char *_mariadb_compress_alloc(const unsigned char *packet, size_t *len, size_t *complen)
+{
+  unsigned char *compbuf;
+  *complen =  *len * 120 / 100 + 12;
+  if (!(compbuf = (unsigned char *) malloc(*complen)))
+    return 0;					/* Not enough memory */
+  if (compress((Bytef*) compbuf,(ulong *) complen, (Bytef*) packet,
+	       (uLong) *len ) != Z_OK)
+  {
+    free(compbuf);
+    return 0;
+  }
+  if (*complen >= *len)
+  {
+    *complen=0;
+    free(compbuf);
+    return 0;
+  }
+  swap(size_t,*len,*complen);			/* *len is now packet length */
+  return compbuf;
+}
+
+my_bool _mariadb_uncompress (unsigned char *packet, size_t *len, size_t *complen)
+{
+  if (*complen)					/* If compressed */
+  {
+    unsigned char *compbuf = (unsigned char *) malloc (*complen);
+    if (!compbuf)
+      return 1;					/* Not enough memory */
+    if (uncompress((Bytef*) compbuf, (uLongf *)complen, (Bytef*) packet, (uLongf)*len) != Z_OK)
+    {						/* Probably wrong packet */
+      free(compbuf);
+      return 1;
+    }
+    *len = *complen;
+    memcpy(packet,compbuf,*len);
+    free(compbuf);
+  }
+  else *complen= *len;
+  return 0;
+}
+#endif /* HAVE_COMPRESS */
-- 
cgit v1.1