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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* 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 <config.h>
#include <drizzled/error.h>
#include <drizzled/function/str/strfunc.h>
#include <drizzled/session.h>
#include <drizzled/system_variables.h>
#include <plugin/compression/uncompress.h>
#include <zlib.h>
#include <string>
using namespace std;
using namespace drizzled;
String *Item_func_uncompress::val_str(String *str)
{
assert(fixed == 1);
String *res= args[0]->val_str(str);
ulong new_size;
int err;
drizzled::error_t code;
if (!res)
goto err;
null_value= 0;
if (res->empty())
return res;
/* If length is less than 4 bytes, data is corrupt */
if (res->length() <= 4)
{
push_warning_printf(&getSession(), DRIZZLE_ERROR::WARN_LEVEL_ERROR,
ER_ZLIB_Z_DATA_ERROR,
ER(ER_ZLIB_Z_DATA_ERROR));
goto err;
}
/* Size of uncompressed data is stored as first 4 bytes of field */
new_size= uint4korr(res->ptr()) & 0x3FFFFFFF;
if (new_size > getSession().variables.max_allowed_packet)
{
push_warning_printf(&getSession(), DRIZZLE_ERROR::WARN_LEVEL_ERROR,
ER_TOO_BIG_FOR_UNCOMPRESS,
ER(ER_TOO_BIG_FOR_UNCOMPRESS),
getSession().variables.max_allowed_packet);
goto err;
}
buffer.realloc(new_size);
if ((err= uncompress((Byte*)buffer.ptr(), &new_size,
((const Bytef*)res->ptr())+4,res->length())) == Z_OK)
{
buffer.length((uint32_t) new_size);
return &buffer;
}
code= ((err == Z_BUF_ERROR) ? ER_ZLIB_Z_BUF_ERROR :
((err == Z_MEM_ERROR) ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_DATA_ERROR));
push_warning(&getSession(), DRIZZLE_ERROR::WARN_LEVEL_ERROR, code, ER(code));
err:
null_value= 1;
return 0;
}
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