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/*
* Copyright (C) 2014 Colin Walters <walters@verbum.org>
* Copyright (C) 2022 Igalia S.L.
*
* 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-common.h"
#include "ostree-lzma-compressor.h"
#include <errno.h>
#include <lzma.h>
#include <string.h>
enum
{
PROP_0,
PROP_PARAMS
};
/**
* SECTION:ostree-lzma-compressor
* @title: LZMA compressor
*
* An implementation of #GConverter that compresses data using
* LZMA.
*/
static void _ostree_lzma_compressor_iface_init (GConverterIface *iface);
/**
* OstreeLzmaCompressor:
*
* Zlib decompression
*/
struct _OstreeLzmaCompressor
{
GObject parent_instance;
GVariant *params;
lzma_stream lstream;
gboolean initialized;
};
G_DEFINE_TYPE_WITH_CODE (OstreeLzmaCompressor, _ostree_lzma_compressor, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
_ostree_lzma_compressor_iface_init))
static void
_ostree_lzma_compressor_finalize (GObject *object)
{
OstreeLzmaCompressor *self = OSTREE_LZMA_COMPRESSOR (object);
lzma_end (&self->lstream);
g_clear_pointer (&self->params, g_variant_unref);
G_OBJECT_CLASS (_ostree_lzma_compressor_parent_class)->finalize (object);
}
static void
_ostree_lzma_compressor_set_property (GObject *object, guint prop_id, const GValue *value,
GParamSpec *pspec)
{
OstreeLzmaCompressor *self = OSTREE_LZMA_COMPRESSOR (object);
switch (prop_id)
{
case PROP_PARAMS:
self->params = g_value_get_variant (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_ostree_lzma_compressor_get_property (GObject *object, guint prop_id, GValue *value,
GParamSpec *pspec)
{
OstreeLzmaCompressor *self = OSTREE_LZMA_COMPRESSOR (object);
switch (prop_id)
{
case PROP_PARAMS:
g_value_set_variant (value, self->params);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_ostree_lzma_compressor_init (OstreeLzmaCompressor *self)
{
lzma_stream tmp = LZMA_STREAM_INIT;
self->lstream = tmp;
}
static void
_ostree_lzma_compressor_class_init (OstreeLzmaCompressorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = _ostree_lzma_compressor_finalize;
gobject_class->get_property = _ostree_lzma_compressor_get_property;
gobject_class->set_property = _ostree_lzma_compressor_set_property;
g_object_class_install_property (
gobject_class, PROP_PARAMS,
g_param_spec_variant ("params", "", "", G_VARIANT_TYPE ("a{sv}"), NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
}
OstreeLzmaCompressor *
_ostree_lzma_compressor_new (GVariant *params)
{
return g_object_new (OSTREE_TYPE_LZMA_COMPRESSOR, "params", params, NULL);
}
static void
_ostree_lzma_compressor_reset (GConverter *converter)
{
OstreeLzmaCompressor *self = OSTREE_LZMA_COMPRESSOR (converter);
if (self->initialized)
{
lzma_stream tmp = LZMA_STREAM_INIT;
lzma_end (&self->lstream);
self->lstream = tmp;
self->initialized = FALSE;
}
}
static GConverterResult
_ostree_lzma_compressor_convert (GConverter *converter, const void *inbuf, gsize inbuf_size,
void *outbuf, gsize outbuf_size, GConverterFlags flags,
gsize *bytes_read, gsize *bytes_written, GError **error)
{
OstreeLzmaCompressor *self = OSTREE_LZMA_COMPRESSOR (converter);
int res;
lzma_action action;
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_easy_encoder (&self->lstream, 8, LZMA_CHECK_CRC64);
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;
action = LZMA_RUN;
if (flags & G_CONVERTER_INPUT_AT_END)
action = LZMA_FINISH;
else if (flags & G_CONVERTER_FLUSH)
action = LZMA_SYNC_FLUSH;
res = lzma_code (&self->lstream, action);
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_compressor_iface_init (GConverterIface *iface)
{
iface->convert = _ostree_lzma_compressor_convert;
iface->reset = _ostree_lzma_compressor_reset;
}
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