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/* xdelta 3 - delta compression tools and library
* Copyright (C) 2012, 2013, 2014, 2015. 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
*/
/* Note: The use of the _easy_ decoder means we're not calling the
* xd3_stream malloc hooks. TODO(jmacd) Fix if anyone cares. */
#ifndef _XDELTA3_LZMA_H_
#define _XDELTA3_LZMA_H_
#include <lzma.h>
typedef struct _xd3_lzma_stream xd3_lzma_stream;
struct _xd3_lzma_stream {
lzma_stream lzma;
lzma_options_lzma options;
lzma_filter filters[2];
};
static xd3_sec_stream*
xd3_lzma_alloc (xd3_stream *stream)
{
return (xd3_sec_stream*) xd3_alloc (stream, sizeof (xd3_lzma_stream), 1);
}
static void
xd3_lzma_destroy (xd3_stream *stream, xd3_sec_stream *sec_stream)
{
xd3_lzma_stream *ls = (xd3_lzma_stream*) sec_stream;
lzma_end (&ls->lzma);
xd3_free (stream, ls);
}
static int
xd3_lzma_init (xd3_stream *stream, xd3_lzma_stream *sec, int is_encode)
{
int ret;
memset (&sec->lzma, 0, sizeof(sec->lzma));
if (is_encode)
{
uint32_t preset =
(stream->flags & XD3_COMPLEVEL_MASK) >> XD3_COMPLEVEL_SHIFT;
if (lzma_lzma_preset(&sec->options, preset))
{
stream->msg = "invalid lzma preset";
return XD3_INVALID;
}
sec->filters[0].id = LZMA_FILTER_LZMA2;
sec->filters[0].options = &sec->options;
sec->filters[1].id = LZMA_VLI_UNKNOWN;
ret = lzma_stream_encoder (&sec->lzma, &sec->filters[0], LZMA_CHECK_NONE);
}
else
{
ret = lzma_stream_decoder (&sec->lzma, UINT64_MAX, LZMA_TELL_NO_CHECK);
}
if (ret != LZMA_OK)
{
stream->msg = "lzma stream init failed";
return XD3_INTERNAL;
}
return 0;
}
static int xd3_decode_lzma (xd3_stream *stream, xd3_lzma_stream *sec,
const uint8_t **input_pos,
const uint8_t *const input_end,
uint8_t **output_pos,
const uint8_t *const output_end)
{
uint8_t *output = *output_pos;
const uint8_t *input = *input_pos;
size_t avail_in = input_end - input;
size_t avail_out = output_end - output;
sec->lzma.avail_in = avail_in;
sec->lzma.next_in = input;
sec->lzma.avail_out = avail_out;
sec->lzma.next_out = output;
while (1)
{
int lret = lzma_code (&sec->lzma, LZMA_RUN);
switch (lret)
{
case LZMA_NO_CHECK:
case LZMA_OK:
if (sec->lzma.avail_out == 0)
{
(*output_pos) = sec->lzma.next_out;
(*input_pos) = sec->lzma.next_in;
return 0;
}
break;
default:
stream->msg = "lzma decoding error";
return XD3_INTERNAL;
}
}
}
#if XD3_ENCODER
static int xd3_encode_lzma (xd3_stream *stream,
xd3_lzma_stream *sec,
xd3_output *input,
xd3_output *output,
xd3_sec_cfg *cfg)
{
lzma_action action = LZMA_RUN;
cfg->inefficient = 1; /* Can't skip windows */
sec->lzma.next_in = NULL;
sec->lzma.avail_in = 0;
sec->lzma.next_out = (output->base + output->next);
sec->lzma.avail_out = (output->avail - output->next);
while (1)
{
int lret;
size_t nwrite;
if (sec->lzma.avail_in == 0 && input != NULL)
{
sec->lzma.avail_in = input->next;
sec->lzma.next_in = input->base;
if ((input = input->next_page) == NULL)
{
action = LZMA_SYNC_FLUSH;
}
}
lret = lzma_code (&sec->lzma, action);
nwrite = (output->avail - output->next) - sec->lzma.avail_out;
if (nwrite != 0)
{
output->next += nwrite;
if (output->next == output->avail)
{
if ((output = xd3_alloc_output (stream, output)) == NULL)
{
return ENOMEM;
}
sec->lzma.next_out = output->base;
sec->lzma.avail_out = output->avail;
}
}
switch (lret)
{
case LZMA_OK:
break;
case LZMA_STREAM_END:
return 0;
default:
stream->msg = "lzma encoding error";
return XD3_INTERNAL;
}
}
return 0;
}
#endif /* XD3_ENCODER */
#endif /* _XDELTA3_LZMA_H_ */
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