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/* xdelta 3 - delta compression tools and library
* Copyright (C) 2007. Joshua P. MacDonald
*
* 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
*/
#ifndef _XDELTA3_MERGE_H_
#define _XDELTA3_MERGE_H_
static int
xd3_whole_state_init (xd3_stream *stream)
{
XD3_ASSERT (stream->whole_target.adds == NULL);
XD3_ASSERT (stream->whole_target.inst == NULL);
stream->whole_target.adds_alloc = XD3_ALLOCSIZE;
stream->whole_target.inst_alloc = XD3_ALLOCSIZE / sizeof (xd3_winst);
if ((stream->whole_target.adds = (uint8_t*)
xd3_alloc (stream, XD3_ALLOCSIZE, 1)) == NULL ||
(stream->whole_target.inst = (xd3_winst*)
xd3_alloc (stream, XD3_ALLOCSIZE, sizeof(xd3_winst))) == NULL)
{
return ENOMEM;
}
return 0;
}
static void
xd3_swap_whole_state (xd3_whole_state *a,
xd3_whole_state *b)
{
xd3_whole_state tmp;
XD3_ASSERT (a->inst != NULL && a->adds != NULL);
XD3_ASSERT (b->inst != NULL && b->adds != NULL);
memcpy (&tmp, a, sizeof (xd3_whole_state));
memcpy (a, b, sizeof (xd3_whole_state));
memcpy (b, &tmp, sizeof (xd3_whole_state));
}
static int
xd3_realloc_buffer (xd3_stream *stream,
usize_t current_units,
usize_t unit_size,
usize_t new_units,
usize_t *alloc_size,
void **alloc_ptr)
{
usize_t needed;
usize_t new_alloc;
usize_t cur_size;
uint8_t *new_buf;
needed = (current_units + new_units) * unit_size;
if (needed <= *alloc_size)
{
return 0;
}
cur_size = current_units * unit_size;
new_alloc = xd3_round_blksize (needed * 2, XD3_ALLOCSIZE);
if ((new_buf = xd3_alloc (stream, new_alloc, 1)) == NULL)
{
return ENOMEM;
}
if (cur_size != 0)
{
memcpy (new_buf, *alloc_ptr, cur_size);
}
if (*alloc_ptr != NULL)
{
xd3_free (stream, *alloc_ptr);
}
*alloc_size = new_alloc;
*alloc_ptr = new_buf;
return 0;
}
static int
xd3_whole_append_inst (xd3_stream *stream,
xd3_hinst *inst)
{
int ret;
xd3_winst *winst;
if ((ret = xd3_realloc_buffer (stream,
stream->whole_target.instlen,
sizeof (xd3_winst),
1,
& stream->whole_target.inst_alloc,
(void**) & stream->whole_target.inst)))
{
return ret;
}
if ((inst->type <= XD3_ADD) &&
(ret = xd3_realloc_buffer (stream,
stream->whole_target.addslen,
1,
(inst->type == XD3_RUN ? 1 : inst->size),
& stream->whole_target.adds_alloc,
(void**) & stream->whole_target.adds)))
{
return ret;
}
winst = &stream->whole_target.inst[stream->whole_target.instlen++];
winst->type = inst->type;
winst->mode = 0;
winst->size = inst->size;
switch (inst->type)
{
case XD3_RUN:
winst->addr = stream->whole_target.addslen;
stream->whole_target.adds[stream->whole_target.addslen++] =
*stream->data_sect.buf++;
break;
case XD3_ADD:
winst->addr = stream->whole_target.addslen;
memcpy (stream->whole_target.adds + stream->whole_target.addslen,
stream->data_sect.buf,
inst->size);
stream->data_sect.buf += inst->size;
stream->whole_target.addslen += inst->size;
break;
default:
if (inst->addr < stream->dec_cpylen)
{
winst->mode = SRCORTGT (stream->dec_win_ind);
winst->addr = stream->dec_cpyoff + inst->addr;
}
else
{
winst->addr = stream->total_out + inst->addr - stream->dec_cpylen;
}
break;
}
return 0;
}
int
xd3_whole_append_window (xd3_stream *stream)
{
int ret;
while (stream->inst_sect.buf < stream->inst_sect.buf_max)
{
if ((ret = xd3_decode_instruction (stream)))
{
return ret;
}
if ((stream->dec_current1.type != XD3_NOOP) &&
(ret = xd3_whole_append_inst (stream,
& stream->dec_current1)))
{
return ret;
}
if ((stream->dec_current2.type != XD3_NOOP) &&
(ret = xd3_whole_append_inst (stream,
& stream->dec_current2)))
{
return ret;
}
}
return 0;
}
/* xd3_merge_inputs() applies *input to *source, returns its result in
* stream. */
int xd3_merge_inputs (xd3_stream *stream,
xd3_whole_state *source,
xd3_whole_state *input)
{
DP(RINT "Merge inputs!\n");
return 0;
}
#endif
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