cbf_read_binary.c

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/**********************************************************************
 * read_binary -- read a binary header                                *
 *                                                                    *
 * Version 0.6 13 January 1999                                        *
 *                                                                    *
 *            Paul Ellis (ellis@ssrl.slac.stanford.edu) and           *
 *         Herbert J. Bernstein (yaya@bernstein-plus-sons.com)        *
 **********************************************************************/
  
/**********************************************************************
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/**********************************************************************
 *                          The IUCr Policy                           *
 *                                 on                                 *
 *     the Use of the Crystallographic Information File (CIF)         *
 *                                                                    *
 * The Crystallographic Information File (Hall, Allen & Brown,        *
 * 1991) is, as of January 1992, the recommended method for           *
 * submitting publications to Acta Crystallographica Section C. The   *
 * International Union of Crystallography holds the Copyright on      *
 * the CIF, and has applied for Patents on the STAR File syntax       *
 * which is the basis for the CIF format.                             *
 *                                                                    *
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 * CIF for the exchange and storage of scientific data. The IUCr's    *
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 * syntax.                                                            *
 *                                                                    *
 * The IUCr policy on the use of the CIF and STAR File processes is   *
 * as follows:                                                        *
 * _________________________________________________________________  *
 *                                                                    *
 *  * 1 CIFs and STAR Files may be generated, stored or transmitted,  *
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 * 5 Abbey Square, Chester CH1 2HU, England.                          *
 **********************************************************************/

#ifdef __cplusplus

extern "C" {

#endif

#include "cbf.h"
#include "cbf_file.h"
#include "cbf_context.h"
#include "cbf_binary.h"
#include "cbf_codes.h"

#include <ctype.h>


  /* Parse a binary header looking for the size and id */
     
int cbf_parse_binaryheader (cbf_file *file, size_t *size, 
                                              long *id,
                                      unsigned int *compression,
                                               int  mime)
{
  unsigned int file_size, file_compression;
  
  int file_id, c;
  

    /* Skip ASCII characters */
    
  do
  
    c = cbf_get_character (file);

  while (isspace (c) || isgraph (c));


    /* Skip the separators:
    
               Byte

               -1?    Ctrl-L     12 (FF) 
                0     Ctrl-Z     26 (SUB)
                1     Ctrl-D      4 (EOT)
                2               213
              3-6     id
             7-14     size                */


  while (c == 12 || c == 26 || c == 4)
  
    c = cbf_get_character (file);


    /* OK? */
          
  if (c != 213)
        
    return CBF_FORMAT;
          
          
    /* Discard any bits in the buffer */
          
  cbf_failnez (cbf_reset_bits (file))

    /* If there was a mime header, there is no id,  size or compression */

  if (mime) return 0;

    /* id */

  cbf_failnez (cbf_get_integer (file, &file_id, 1, 64))

  if (id)
          
    *id = file_id;


    /* Size */
          
  cbf_failnez (cbf_get_integer (file, (int *) &file_size, 0, 64))
     
  if (size)
     
    *size = file_size;

    /* Compression Type */
          
  cbf_failnez (cbf_get_integer (file, (int *) &file_compression, 0, 64))
     
  if (compression)
     
    *compression = file_compression;


    /* Success */
    
  return 0;      
}


#ifdef __cplusplus

}

#endif