bits_fget

SFL
Version 2.11

`bits_fget`

#include "sflbits.h"
BITS *
bits_fget (FILE *file)

Synopsis

Reads a bitstring from the specified file stream. You must have previously written the bitstring using bit_fput (). Returns a newly-created bitmap, or NULL if there was insufficient memory.

Source Code - (sflbits.c)

{
    int
        block_nbr;                      /*  Bitstring block number           */
    word
        comp_size;                      /*  Size of compressed block         */
    BITBLOCK
        *block_ptr;                     /*  Points to bitstring block        */
    BITS
        *bits;

    ASSERT (file);

    bits = bits create ();              /*  Create a new, empty bitmap       */

    /*  Read bitstring header from file                                      */
    fread (&bits-> block_count, sizeof (bits-> block_count), 1, file);
    fread (&bits-> free_list,   sizeof (bits-> free_list),   1, file);

    /*  Read bitstring blocks from file                                      */
    for (block_nbr = 0; block_nbr < bits-> block_count; block_nbr++)
      {
        block_nbr = alloc_block (bits);
        if (block_nbr == 0)
          {
            bits destroy (bits);
            return (NULL);
          }
        fread (&comp_size, sizeof (comp_size), 1, file);
        fread (compressed, comp_size,          1, file);
        block_ptr        = bits-> block [block_nbr];
        block_ptr-> size = expand block (compressed, (byte *) block_ptr,
                                         comp_size);
      }
    return (bits);
}

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