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/* -*- mode: c; c-file-style: "gnu" -*- */
/* libhsync
Copyright (C) 2000 by Martin Pool <mbp@humbug.org.au>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
*/
#include "includes.h"
#include "hsync.h"
#include "hsyncproto.h"
#include "private.h"
int
_hs_fill_inbuf (inbuf_t * inbuf, rs_read_fn_t read_fn, void *readprivate)
{
int ret;
assert (inbuf->amount < inbuf->len && 0 <= inbuf->amount);
ret = read_fn (readprivate,
inbuf->buf + inbuf->amount, inbuf->len - inbuf->amount);
if (ret < 0)
{
_hs_error ( __FILE__ ": error reading into input buffer");
return ret;
}
else if (ret == 0)
{
_hs_trace ("reached end of input file");
}
else
{
_hs_trace ("read %d bytes into input buffer"
" at position %d", ret, inbuf->abspos);
}
inbuf->amount += ret;
return ret;
}
int
_hs_alloc_inbuf (inbuf_t * inbuf, int block_len)
{
bzero (inbuf, sizeof *inbuf);
/* must be at least two blocks; shouldn't be too small. */
inbuf->len = MAX (block_len * 2, 8192);
inbuf->buf = malloc (inbuf->len);
inbuf->amount = 0;
inbuf->abspos = 0;
return 0;
}
int
_hs_slide_inbuf (inbuf_t *inbuf)
{
/* Copy the remaining data into the front of
the buffer */
if (inbuf->cursor != 0)
{
if (inbuf->amount != inbuf->cursor)
{
memcpy (inbuf->buf,
inbuf->buf + inbuf->cursor, inbuf->amount - inbuf->cursor);
_hs_trace (": slide %d bytes down to the start of the buffer",
inbuf->amount - inbuf->cursor);
}
inbuf->amount -= inbuf->cursor;
inbuf->abspos += inbuf->cursor;
}
return 0;
}
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