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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2023 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 2.1 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/>.
*
* Based on gzlibcompressor.h:
* Author: Alexander Larsson <alexl@redhat.com>
* Author: Owen Taylor <otaylor@redhat.com>
*/
#include "config.h"
#include "flatpak-zstd-compressor-private.h"
#include <errno.h>
#include <string.h>
#ifdef HAVE_ZSTD
#include <zstd.h>
#endif
struct _FlatpakZstdCompressor
{
GObject parent_instance;
int level;
#ifdef HAVE_ZSTD
ZSTD_CStream *cstream;
#endif
};
static void flatpak_zstd_compressor_iface_init (GConverterIface *iface);
G_DEFINE_TYPE_WITH_CODE (FlatpakZstdCompressor,
flatpak_zstd_compressor,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
flatpak_zstd_compressor_iface_init))
static GConverterResult
flatpak_zstd_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)
{
#ifdef HAVE_ZSTD
FlatpakZstdCompressor *compressor = FLATPAK_ZSTD_COMPRESSOR (converter);
ZSTD_inBuffer input = { inbuf, inbuf_size, 0 };
ZSTD_outBuffer output = {outbuf, outbuf_size, 0 };
ZSTD_EndDirective end_op;
size_t res;
end_op = ZSTD_e_continue;
if (flags & G_CONVERTER_INPUT_AT_END)
end_op = ZSTD_e_end;
else if (flags & G_CONVERTER_FLUSH)
end_op = ZSTD_e_flush;
res = ZSTD_compressStream2 (compressor->cstream, &output, &input, end_op);
if (ZSTD_isError (res))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA,
"Zstd compression error: %s", ZSTD_getErrorName (res));
return G_CONVERTER_ERROR;
}
*bytes_read = input.pos;
*bytes_written = output.pos;
if (flags & G_CONVERTER_INPUT_AT_END && res == 0)
return G_CONVERTER_FINISHED;
/* We should make some progress */
g_assert (input.pos != 0 || output.pos != 0);
return G_CONVERTER_CONVERTED;
#else
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"libzstd not available");
return G_CONVERTER_ERROR;
#endif
}
static void
flatpak_zstd_compressor_reset (GConverter *converter)
{
#ifdef HAVE_ZSTD
FlatpakZstdCompressor *compressor = FLATPAK_ZSTD_COMPRESSOR (converter);
ZSTD_initCStream(compressor->cstream, compressor->level);
#endif
}
static void
flatpak_zstd_compressor_iface_init (GConverterIface *iface)
{
iface->convert = flatpak_zstd_compressor_convert;
iface->reset = flatpak_zstd_compressor_reset;
}
static void
flatpak_zstd_compressor_finalize (GObject *object)
{
#ifdef HAVE_ZSTD
FlatpakZstdCompressor *compressor = FLATPAK_ZSTD_COMPRESSOR (object);
ZSTD_freeCStream (compressor->cstream);
#endif
G_OBJECT_CLASS (flatpak_zstd_compressor_parent_class)->finalize (object);
}
static void
flatpak_zstd_compressor_class_init (FlatpakZstdCompressorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = flatpak_zstd_compressor_finalize;
}
static void
flatpak_zstd_compressor_init (FlatpakZstdCompressor *compressor)
{
}
FlatpakZstdCompressor *
flatpak_zstd_compressor_new (int level)
{
FlatpakZstdCompressor *compressor;
compressor = g_object_new (FLATPAK_TYPE_ZSTD_COMPRESSOR, NULL);
#ifdef HAVE_ZSTD
compressor->level = level < 0 ? ZSTD_CLEVEL_DEFAULT : level;
compressor->cstream = ZSTD_createCStream ();
if (!compressor->cstream)
g_error ("FlatpakZstdCompressor: Not enough memory for zstd use");
flatpak_zstd_compressor_reset (G_CONVERTER (compressor));
#endif
return compressor;
}
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