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/*
* Copyright (C) 2014 Colin Walters <walters@verbum.org>
*
* SPDX-License-Identifier: LGPL-2.0+
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "ostree-lzma-decompressor.h"
#include "ostree-lzma-common.h"
#include <errno.h>
#include <lzma.h>
#include <string.h>
enum {
PROP_0,
};
/**
* SECTION:ostree-lzma-decompressor
* @title: LZMA decompressor
*
* An implementation of #GConverter that decompresses data using
* LZMA.
*/
static void _ostree_lzma_decompressor_iface_init (GConverterIface *iface);
struct _OstreeLzmaDecompressor
{
GObject parent_instance;
lzma_stream lstream;
gboolean initialized;
};
G_DEFINE_TYPE_WITH_CODE (OstreeLzmaDecompressor, _ostree_lzma_decompressor,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
_ostree_lzma_decompressor_iface_init))
static void
_ostree_lzma_decompressor_finalize (GObject *object)
{
OstreeLzmaDecompressor *self;
self = OSTREE_LZMA_DECOMPRESSOR (object);
lzma_end (&self->lstream);
G_OBJECT_CLASS (_ostree_lzma_decompressor_parent_class)->finalize (object);
}
static void
_ostree_lzma_decompressor_init (OstreeLzmaDecompressor *self)
{
lzma_stream tmp = LZMA_STREAM_INIT;
self->lstream = tmp;
}
static void
_ostree_lzma_decompressor_class_init (OstreeLzmaDecompressorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = _ostree_lzma_decompressor_finalize;
}
OstreeLzmaDecompressor *
_ostree_lzma_decompressor_new (void)
{
return g_object_new (OSTREE_TYPE_LZMA_DECOMPRESSOR, NULL);
}
static void
_ostree_lzma_decompressor_reset (GConverter *converter)
{
OstreeLzmaDecompressor *self = OSTREE_LZMA_DECOMPRESSOR (converter);
if (self->initialized)
{
lzma_stream tmp = LZMA_STREAM_INIT;
lzma_end (&self->lstream);
self->lstream = tmp;
self->initialized = FALSE;
}
}
static GConverterResult
_ostree_lzma_decompressor_convert (GConverter *converter,
const void *inbuf,
gsize inbuf_size,
void *outbuf,
gsize outbuf_size,
GConverterFlags flags,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
OstreeLzmaDecompressor *self = OSTREE_LZMA_DECOMPRESSOR (converter);
int res;
if (inbuf_size != 0 && outbuf_size == 0)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE,
"Output buffer too small");
return G_CONVERTER_ERROR;
}
if (!self->initialized)
{
res = lzma_stream_decoder (&self->lstream, G_MAXUINT64, 0);
if (res != LZMA_OK)
goto out;
self->initialized = TRUE;
}
self->lstream.next_in = (void *)inbuf;
self->lstream.avail_in = inbuf_size;
self->lstream.next_out = outbuf;
self->lstream.avail_out = outbuf_size;
res = lzma_code (&self->lstream, LZMA_RUN);
if (res != LZMA_OK && res != LZMA_STREAM_END)
goto out;
*bytes_read = inbuf_size - self->lstream.avail_in;
*bytes_written = outbuf_size - self->lstream.avail_out;
out:
return _ostree_lzma_return (res, error);
}
static void
_ostree_lzma_decompressor_iface_init (GConverterIface *iface)
{
iface->convert = _ostree_lzma_decompressor_convert;
iface->reset = _ostree_lzma_decompressor_reset;
}
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