1 files changed, 73 insertions, 0 deletions
diff --git a/ext/mysql/libmysql/my_compress.c b/ext/mysql/libmysql/my_compress.c
new file mode 100644
index 0000000000..79d4d2963d
--- /dev/null
+++ b/ext/mysql/libmysql/my_compress.c
@@ -0,0 +1,73 @@
+/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
+   This file is public domain and comes with NO WARRANTY of any kind */
+
+/* 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 */