~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2003 MySQL AB

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include <my_global.h>

#include <drizzle.h>

/* Get the length of next field. Change parameter to point at fieldstart */

ulong STDCALL net_field_length(uchar **packet)

{

  register 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 int64_t */

uint64_t net_field_length_ll(uchar **packet)

{

  register uchar *pos= *packet;

  if (*pos < 251)

  {

    (*packet)++;

    return (uint64_t) *pos;

  }

  if (*pos == 251)

  {

    (*packet)++;

    return (uint64_t) NULL_LENGTH;

  }

  if (*pos == 252)

  {

    (*packet)+=3;

    return (uint64_t) uint2korr(pos+1);

  }

  if (*pos == 253)

  {

    (*packet)+=4;

    return (uint64_t) uint3korr(pos+1);

  }

  (*packet)+=9;					/* Must be 254 when here */

#ifdef NO_CLIENT_LONGLONG

  return (uint64_t) uint4korr(pos+1);

#else

  return (uint64_t) uint8korr(pos+1);

#endif

}

/*

  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 for the LL() becasue of a bug in Forte CC

    compiler.

  RETURN

   Position in 'pkg' after the packed length

*/

uchar *net_store_length(uchar *packet, uint64_t length)

{

  if (length < (uint64_t) 251LL)

  {

    *packet=(uchar) length;

    return packet+1;

  }

  /* 251 is reserved for NULL */

  if (length < (uint64_t) 65536LL)

  {

    *packet++=252;

    int2store(packet,(uint) length);

    return packet+2;

  }

  if (length < (uint64_t) 16777216LL)

  {

    *packet++=253;

    int3store(packet,(ulong) length);

    return packet+3;

  }

  *packet++=254;

  int8store(packet,length);

  return packet+8;

}