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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 Shaun McCance <shaunm@gnome.org>
*
* 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/>.
*
* Author: Shaun McCance <shaunm@gnome.org>
*/
#include "config.h"
#include <glib/gi18n.h>
#include <string.h>
#include "yelp-magic-decompressor.h"
#ifdef ENABLE_BZ2
#include "yelp-bz2-decompressor.h"
#endif
#ifdef ENABLE_LZMA
#include "yelp-lzma-decompressor.h"
#endif
static void yelp_magic_decompressor_iface_init (GConverterIface *iface);
struct _YelpMagicDecompressor
{
GObject parent_instance;
GConverter *magic_decoder_ring;
gboolean first;
};
G_DEFINE_TYPE_WITH_CODE (YelpMagicDecompressor, yelp_magic_decompressor, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
yelp_magic_decompressor_iface_init))
static void
yelp_magic_decompressor_dispose (GObject *object)
{
YelpMagicDecompressor *decompressor = YELP_MAGIC_DECOMPRESSOR (object);
if (decompressor->magic_decoder_ring) {
g_object_unref (decompressor->magic_decoder_ring);
decompressor->magic_decoder_ring = NULL;
}
G_OBJECT_CLASS (yelp_magic_decompressor_parent_class)->dispose (object);
}
static void
yelp_magic_decompressor_init (YelpMagicDecompressor *decompressor)
{
decompressor->magic_decoder_ring = NULL;
decompressor->first = TRUE;
}
static void
yelp_magic_decompressor_class_init (YelpMagicDecompressorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = yelp_magic_decompressor_dispose;
}
YelpMagicDecompressor *
yelp_magic_decompressor_new (void)
{
YelpMagicDecompressor *decompressor;
decompressor = g_object_new (YELP_TYPE_MAGIC_DECOMPRESSOR, NULL);
return decompressor;
}
static void
yelp_magic_decompressor_reset (GConverter *converter)
{
YelpMagicDecompressor *decompressor = YELP_MAGIC_DECOMPRESSOR (converter);
if (decompressor->magic_decoder_ring)
g_converter_reset (decompressor->magic_decoder_ring);
}
static GConverter*
yelp_magic_decompressor_choose (const void *inbuf, gsize inbuf_size)
{
/* If input_size is less than two the first time, we end up
* not getting detection. Might be worth addressing. Not
* sure I care.
*
* The two-byte magic we're doing here is not sufficient in
* the general case. It is sufficient for the specific data
* Yelp deals with.
*/
if (inbuf_size <= 2)
return NULL;
#ifdef ENABLE_BZ2
if (((gchar *) inbuf)[0] == 'B' && ((gchar *) inbuf)[1] == 'Z') {
return (GConverter *) yelp_bz2_decompressor_new ();
}
#endif
#ifdef ENABLE_LZMA
if (((gchar *) inbuf)[0] == ']' && ((gchar *) inbuf)[1] == '\0') {
return (GConverter *) yelp_lzma_decompressor_new ();
}
#endif
if (((guint8*) inbuf)[0] == 0x1F && ((guint8*) inbuf)[1] == 0x8B) {
return (GConverter *) g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
}
return NULL;
}
static GConverterResult
yelp_magic_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)
{
YelpMagicDecompressor *decompressor;
gsize txfer_size;
decompressor = YELP_MAGIC_DECOMPRESSOR (converter);
if (decompressor->first) {
decompressor->magic_decoder_ring =
yelp_magic_decompressor_choose (inbuf, inbuf_size);
decompressor->first = FALSE;
}
if (decompressor->magic_decoder_ring) {
return g_converter_convert (decompressor->magic_decoder_ring,
inbuf, inbuf_size,
outbuf, outbuf_size,
flags,
bytes_read, bytes_written,
error);
}
/* If there's no magic_decoder_ring, we just copy the data
* straight through. */
txfer_size = MIN (inbuf_size, outbuf_size);
memcpy (outbuf, inbuf, txfer_size);
*bytes_read = txfer_size;
*bytes_written = txfer_size;
if (flags & G_CONVERTER_INPUT_AT_END)
return G_CONVERTER_FINISHED;
return G_CONVERTER_CONVERTED;
}
static void
yelp_magic_decompressor_iface_init (GConverterIface *iface)
{
iface->convert = yelp_magic_decompressor_convert;
iface->reset = yelp_magic_decompressor_reset;
}
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