From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/sql-common/pack.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 mysql/sql-common/pack.c

(limited to 'mysql/sql-common/pack.c')

diff --git a/mysql/sql-common/pack.c b/mysql/sql-common/pack.c
new file mode 100644
index 0000000..971fa66
--- /dev/null
+++ b/mysql/sql-common/pack.c
@@ -0,0 +1,140 @@
+/* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#include <my_global.h>
+#include <mysql_com.h>
+#include <mysql.h>
+
+/* Get the length of next field. Change parameter to point at fieldstart */
+ulong STDCALL net_field_length(uchar **packet)
+{
+  uchar *pos= (uchar *)*packet;
+  if (*pos < 251)
+  {
+    (*packet)++;
+    return (ulong) *pos;
+  }
+  if (*pos == 251)
+  {
+    (*packet)++;
+    return NULL_LENGTH;
+  }
+  if (*pos == 252)
+  {
+    (*packet)+=3;
+    return (ulong) uint2korr(pos+1);
+  }
+  if (*pos == 253)
+  {
+    (*packet)+=4;
+    return (ulong) uint3korr(pos+1);
+  }
+  (*packet)+=9;					/* Must be 254 when here */
+  return (ulong) uint4korr(pos+1);
+}
+
+/* The same as above but returns longlong */
+my_ulonglong net_field_length_ll(uchar **packet)
+{
+  uchar *pos= *packet;
+  if (*pos < 251)
+  {
+    (*packet)++;
+    return (my_ulonglong) *pos;
+  }
+  if (*pos == 251)
+  {
+    (*packet)++;
+    return (my_ulonglong) NULL_LENGTH;
+  }
+  if (*pos == 252)
+  {
+    (*packet)+=3;
+    return (my_ulonglong) uint2korr(pos+1);
+  }
+  if (*pos == 253)
+  {
+    (*packet)+=4;
+    return (my_ulonglong) uint3korr(pos+1);
+  }
+  (*packet)+=9;					/* Must be 254 when here */
+  return (my_ulonglong) uint8korr(pos+1);
+}
+
+/*
+  Store an integer with simple packing into a output package
+
+  SYNOPSIS
+    net_store_length()
+    pkg			Store the packed integer here
+    length		integers to store
+
+  NOTES
+    This is mostly used to store lengths of strings.
+    We have to cast the result of the LL because of a bug in Forte CC
+    compiler.
+
+  RETURN
+   Position in 'pkg' after the packed length
+*/
+
+uchar *net_store_length(uchar *packet, ulonglong length)
+{
+  if (length < (ulonglong) 251LL)
+  {
+    *packet=(uchar) length;
+    return packet+1;
+  }
+  /* 251 is reserved for NULL */
+  if (length < (ulonglong) 65536LL)
+  {
+    *packet++=252;
+    int2store(packet,(uint) length);
+    return packet+2;
+  }
+  if (length < (ulonglong) 16777216LL)
+  {
+    *packet++=253;
+    int3store(packet,(ulong) length);
+    return packet+3;
+  }
+  *packet++=254;
+  int8store(packet,length);
+  return packet+8;
+}
+
+
+/**
+  The length of space required to store the resulting length-encoded integer
+  for the given number. This function can be used at places where one needs to
+  dynamically allocate the buffer for a given number to be stored as length-
+  encoded integer.
+
+  @param num [IN]   the input number
+
+  @return length of buffer needed to store this number [1, 3, 4, 9].
+*/
+
+uint net_length_size(ulonglong num)
+{
+  if (num < (ulonglong) 252LL)
+    return 1;
+  if (num < (ulonglong) 65536LL)
+    return 3;
+  if (num < (ulonglong) 16777216LL)
+    return 4;
+  return 9;
+}
+
-- 
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