1 files changed, 87 insertions, 0 deletions
diff --git a/mysys/my_compress.c b/mysys/my_compress.c
new file mode 100644
index 00000000000..d1e32234135
--- /dev/null
+++ b/mysys/my_compress.c
@@ -0,0 +1,87 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+/* Written by Sinisa Milivojevic <sinisa@coresinc.com> */
+
+#include <global.h>
+#ifdef HAVE_COMPRESS
+#include <my_sys.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 my_compress(byte *packet, ulong *len, ulong *complen)
+{
+  if (*len < MIN_COMPRESS_LENGTH)
+    *complen=0;
+  else
+  {
+    byte *compbuf=my_compress_alloc(packet,len,complen);
+    if (!compbuf)
+      return *complen ? 0 : 1;
+    memcpy(packet,compbuf,*len);
+    my_free(compbuf,MYF(MY_WME));						  }
+  return 0;
+}
+
+
+byte *my_compress_alloc(const byte *packet, ulong *len, ulong *complen)
+{
+  byte *compbuf;
+  *complen =  *len * 120 / 100 + 12;
+  if (!(compbuf = (byte *) my_malloc(*complen,MYF(MY_WME))))
+    return 0;					/* Not enough memory */
+  if (compress((Bytef*) compbuf,(ulong *) complen, (Bytef*) packet,
+	       (uLong) *len ) != Z_OK)
+  {
+    my_free(compbuf,MYF(MY_WME));
+    return 0;
+  }
+  if (*complen >= *len)
+  {
+    *complen=0;
+    my_free(compbuf,MYF(MY_WME));
+    return 0;
+  }
+  swap(ulong,*len,*complen);			/* *len is now packet length */
+  return compbuf;
+}
+
+
+my_bool my_uncompress (byte *packet, ulong *len, ulong *complen)
+{
+  if (*complen)					/* If compressed */
+  {
+    byte *compbuf = (byte *) my_malloc (*complen,MYF(MY_WME));
+    if (!compbuf)
+      return 1;					/* Not enough memory */
+    if (uncompress((Bytef*) compbuf, complen, (Bytef*) packet, *len) != Z_OK)
+    {						/* Probably wrong packet */
+      my_free (compbuf,MYF(MY_WME));
+      return 1;
+    }
+    *len = *complen;
+    memcpy(packet,compbuf,*len);
+    my_free(compbuf,MYF(MY_WME));
+  }
+  return 0;
+}
+#endif /* HAVE_COMPRESS */