libextractor

GNU libextractor
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iconv.c (2190B)

      1 /*
      2      This file is part of libextractor.
      3      Copyright (C) 2002, 2003, 2004 Vidyut Samanta and Christian Grothoff
      4 
      5      libextractor is free software; you can redistribute it and/or modify
      6      it under the terms of the GNU General Public License as published
      7      by the Free Software Foundation; either version 2, or (at your
      8      option) any later version.
      9 
     10      libextractor is distributed in the hope that it will be useful, but
     11      WITHOUT ANY WARRANTY; without even the implied warranty of
     12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13      General Public License for more details.
     14 
     15      You should have received a copy of the GNU General Public License
     16      along with libextractor; see the file COPYING.  If not, write to the
     17      Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18      Boston, MA 02110-1301, USA.
     19 */
     20 
     21 /**
     22  * @file main/iconv.c
     23  * @brief convenience functions for character conversion
     24  * @author Christian Grothoff
     25  */
     26 
     27 /**
     28  * Convert the given input using the given converter
     29  * and return as a 0-terminated string.
     30  *
     31  * @param cd converter to use
     32  * @param in input string
     33  * @param inSize number of bytes in 'in'
     34  * @return NULL on error, otherwise the converted string (to be free'd by caller)
     35  */
     36 static char *
     37 iconv_helper (iconv_t cd,
     38               const char *in,
     39               size_t inSize)
     40 {
     41 #if HAVE_ICONV
     42   char *buf;
     43   char *ibuf;
     44   const char *i;
     45   size_t outSize;
     46   size_t outLeft;
     47 
     48   if (inSize > 1024 * 1024)
     49     return NULL; /* too big to be meta data */
     50   i = in;
     51   /* reset iconv */
     52   iconv (cd, NULL, NULL, NULL, NULL);
     53   outSize = 4 * inSize + 2;
     54   outLeft = outSize - 2; /* make sure we have 2 0-terminations! */
     55   if (NULL == (buf = malloc (outSize)))
     56     return NULL;
     57   ibuf = buf;
     58   memset (buf, 0, outSize);
     59   if (iconv (cd,
     60              (char**) &in,
     61              &inSize,
     62              &ibuf,
     63              &outLeft) == SIZE_MAX)
     64   {
     65     /* conversion failed */
     66     free (buf);
     67     return strdup (i);
     68   }
     69   return buf;
     70 #else
     71   /* good luck, just copying string... */
     72   char *buf;
     73 
     74   buf = malloc (inSize + 1);
     75   memcpy (buf, in, inSize);
     76   buf[inSize] = '\0';
     77 #endif
     78 }
     79 
     80 
     81 /* end of iconv.c */