86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
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/* BLOCKIO.C - Routines to read/write blocks of bits from/to a text file. */
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/* Copyright (c) 1995-2012 by Radford M. Neal.
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*
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* Permission is granted for anyone to copy, use, modify, and distribute
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* these programs and accompanying documents for any purpose, provided
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* this copyright notice is retained and prominently displayed, and note
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* is made of any changes made to these programs. These programs and
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* documents are distributed without any warranty, express or implied.
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* As the programs were written for research purposes only, they have not
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* been tested to the degree that would be advisable in any important
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* application. All use of these programs is entirely at the user's own
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* risk.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "blockio.h"
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int blockio_flush = 0; /* Should blocks written be immediately flushed? */
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/* READ A BLOCK OF BITS. The bits must be given as '0' or '1' characters,
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with whitespace allowed (but not required) between bits. Returns 0 if
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a block is read successfully, and EOF if eof or an error occurs. If
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EOF is returned, a warning will be printed if a partial block had already
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been read. */
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int blockio_read
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( FILE *f, /* File to read from */
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char *b, /* Place to store bits read */
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int l /* Length of block */
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)
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{
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int i, c;
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for (i = 0; i<l; i++)
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{
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do
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{ c = getc(f);
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if (c==EOF)
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{ if (i>0)
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{ fprintf(stderr,
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"Warning: Short block (%d long) at end of input file ignored\n",i);
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}
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return EOF;
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}
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} while (c==' ' || c=='\t' || c=='\n' || c=='\r');
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if (c!='0' && c!='1')
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{ fprintf(stderr,"Bad character in binary file (not '0' or '1')\n");
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exit(1);
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}
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b[i] = c=='1';
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}
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return 0;
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}
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/* WRITE A BLOCK OF BITS. Bits are written as '0' and '1' characters, with
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no spaces between them, followed by a newline. */
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void blockio_write
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( FILE *f, /* File to write to */
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char *b, /* Block of bits to write */
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int l /* Length of block */
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)
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{
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int i;
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for (i = 0; i<l; i++)
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{ if (b[i]!=0 && b[i]!=1) abort();
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putc("01"[b[i]],f);
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}
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putc('\n',f);
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if (blockio_flush)
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{ fflush(f);
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}
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}
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