1                 : /* -*- mode: C -*-
       2                 :  *
       3                 :  *       File:         pdf-stm-f-null.c
       4                 :  *       Date:         Mon Jul  9 22:01:41 2007
       5                 :  *
       6                 :  *       GNU PDF Library - NULL stream filter
       7                 :  *
       8                 :  */
       9                 : 
      10                 : /* Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc. */
      11                 : 
      12                 : /* This program is free software: you can redistribute it and/or modify
      13                 :  * it under the terms of the GNU General Public License as published by
      14                 :  * the Free Software Foundation, either version 3 of the License, or
      15                 :  * (at your option) any later version.
      16                 :  *
      17                 :  * This program is distributed in the hope that it will be useful,
      18                 :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      19                 :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      20                 :  * GNU General Public License for more details.
      21                 :  *
      22                 :  * You should have received a copy of the GNU General Public License
      23                 :  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
      24                 :  */
      25                 : 
      26                 : #include <config.h>
      27                 : 
      28                 : #include <string.h>
      29                 : 
      30                 : #include <pdf-types.h>
      31                 : #include <pdf-stm-f-null.h>
      32                 : 
      33                 : /*
      34                 :  * Public functions
      35                 :  */
      36                 : 
      37                 : pdf_status_t
      38                 : pdf_stm_f_null_init (pdf_hash_t params,
      39                 :                      void **state)
      40             806 : {
      41                 :   /* This filter does not use any parameters and does not hold any
      42                 :      internal state */
      43                 : 
      44             806 :   return PDF_OK;
      45                 : }
      46                 : 
      47                 : pdf_status_t
      48                 : pdf_stm_f_null_apply (pdf_hash_t params,
      49                 :                       void *state,
      50                 :                       pdf_buffer_t in,
      51                 :                       pdf_buffer_t out,
      52                 :                       pdf_bool_t finish_p)
      53            4973 : {
      54                 :   pdf_size_t in_size;
      55                 :   pdf_size_t out_size;
      56                 :   pdf_size_t bytes_to_copy;
      57                 :   pdf_status_t ret;
      58                 : 
      59                 :   /* Fill the output buffer with the contents of the input buffer, but
      60                 :      note that the second may be bigger than the former */
      61            4973 :   in_size = in->wp - in->rp;
      62            4973 :   out_size = out->size - out->wp;
      63                 : 
      64            4973 :   bytes_to_copy = PDF_MIN(out_size, in_size);
      65                 : 
      66            4973 :   if (bytes_to_copy != 0)
      67                 :     {
      68            2005 :       memcpy ((char *) out->data,
      69                 :               (char *) in->data,
      70                 :               bytes_to_copy);
      71                 : 
      72            2005 :       in->rp = in->rp + bytes_to_copy;
      73            2005 :       out->wp = out->wp + bytes_to_copy;
      74                 :     }
      75                 : 
      76            4973 :   if (in_size > out_size)
      77                 :     {
      78                 :       /* We need more room in the output buffer */
      79               0 :       ret = PDF_ENOUTPUT;
      80                 :     }
      81                 :   else
      82                 :     {
      83                 :       /* We can process more input */
      84            4973 :       ret = PDF_ENINPUT;
      85                 :     }
      86                 :       
      87            4973 :   return ret;
      88                 : }
      89                 : 
      90                 : pdf_status_t
      91                 : pdf_stm_f_null_dealloc_state (void *state)
      92             621 : {
      93             621 :   return PDF_OK;
      94                 : }
      95                 : 
      96                 : /* End of pdf_stm_f_null.c */