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Add GZlibCompressor

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This commit is contained in:
Alexander Larsson 2009-11-20 12:04:31 +01:00
parent 38c3eb14e4
commit 92b9218cbf
5 changed files with 371 additions and 0 deletions
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2
gio/Makefile.am
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@ -265,6 +265,7 @@ libgio_2_0_la_SOURCES = \
gvfs.c \
gvolume.c \
gvolumemonitor.c \
gzlibcompressor.c \
gzlibdecompressor.c \
gmountprivate.h \
gioenumtypes.h \
@ -391,6 +392,7 @@ gio_headers = \
gvfs.h \
gvolume.h \
gvolumemonitor.h \
gzlibcompressor.h \
gzlibdecompressor.h \
$(NULL)

1
gio/gio.h
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@ -93,6 +93,7 @@
#include <gio/gvfs.h>
#include <gio/gvolume.h>
#include <gio/gvolumemonitor.h>
#include <gio/gzlibcompressor.h>
#include <gio/gzlibdecompressor.h>
#undef __GIO_GIO_H_INSIDE__

1
gio/giotypes.h
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@ -43,6 +43,7 @@ typedef struct _GConverter GConverter;
typedef struct _GConverterInputStream GConverterInputStream;
typedef struct _GConverterOutputStream GConverterOutputStream;
typedef struct _GDataInputStream GDataInputStream;
typedef struct _GZlibCompressor GZlibCompressor;
typedef struct _GZlibDecompressor GZlibDecompressor;
/**

316
gio/gzlibcompressor.c Normal file
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@ -0,0 +1,316 @@
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2009 Red Hat, Inc.
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <errno.h>
#include <zlib.h>
#include <string.h>
#include "gzlibcompressor.h"
#include "glib.h"
#include "gioerror.h"
#include "glibintl.h"
#include "gioenums.h"
#include "gioenumtypes.h"
#include "gioalias.h"
enum {
PROP_0,
PROP_FORMAT,
PROP_LEVEL
};
/**
* SECTION:gzcompressor
* @short_description: Zlib compressor
* @include: gio/gio.h
*
* #GZlibCompressor is an implementation of #GCompressor that
* decompresses data compressed with zlib.
*/
static void g_zlib_compressor_iface_init (GConverterIface *iface);
/**
* GZlibCompressor:
*
* Zlib decompression
*/
struct _GZlibCompressor
{
GObject parent_instance;
GZlibCompressorFormat format;
int level;
z_stream zstream;
};
G_DEFINE_TYPE_WITH_CODE (GZlibCompressor, g_zlib_compressor, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
g_zlib_compressor_iface_init))
static void
g_zlib_compressor_finalize (GObject *object)
{
GZlibCompressor *compressor;
compressor = G_ZLIB_COMPRESSOR (object);
deflateEnd (&compressor->zstream);
G_OBJECT_CLASS (g_zlib_compressor_parent_class)->finalize (object);
}
static void
g_zlib_compressor_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GZlibCompressor *compressor;
compressor = G_ZLIB_COMPRESSOR (object);
switch (prop_id)
{
case PROP_FORMAT:
compressor->format = g_value_get_enum (value);
break;
case PROP_LEVEL:
compressor->level = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_zlib_compressor_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GZlibCompressor *compressor;
compressor = G_ZLIB_COMPRESSOR (object);
switch (prop_id)
{
case PROP_FORMAT:
g_value_set_enum (value, compressor->format);
break;
case PROP_LEVEL:
g_value_set_int (value, compressor->level);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_zlib_compressor_init (GZlibCompressor *compressor)
{
}
static void
g_zlib_compressor_constructed (GObject *object)
{
GZlibCompressor *compressor;
int res;
compressor = G_ZLIB_COMPRESSOR (object);
if (compressor->format == G_ZLIB_COMPRESSOR_FORMAT_GZIP)
{
/* + 16 for gzip */
res = deflateInit2 (&compressor->zstream,
compressor->level, Z_DEFLATED,
MAX_WBITS + 16, 8,
Z_DEFAULT_STRATEGY);
}
else
res = deflateInit (&compressor->zstream, compressor->level);
if (res == Z_MEM_ERROR )
g_error ("GZlibCompressor: Not enough memory for zlib use");
if (res != Z_OK)
g_warning ("unexpected zlib error: %s\n", compressor->zstream.msg);
}
static void
g_zlib_compressor_class_init (GZlibCompressorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_zlib_compressor_finalize;
gobject_class->constructed = g_zlib_compressor_constructed;
gobject_class->get_property = g_zlib_compressor_get_property;
gobject_class->set_property = g_zlib_compressor_set_property;
g_object_class_install_property (gobject_class,
PROP_FORMAT,
g_param_spec_enum ("format",
P_("compression format"),
P_("The format of the compressed data"),
G_TYPE_ZLIB_COMPRESSOR_FORMAT,
G_ZLIB_COMPRESSOR_FORMAT_RAW,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_LEVEL,
g_param_spec_int ("level",
P_("compression level"),
P_("The level of compression from 0 (no compression) to 9 (most compression), -1 for the default level"),
-1, 9,
-1,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
/**
* g_zlib_compressor_new:
* @format: The format to use for the compressed data
* @level: compression level (0-9), -1 for default
*
* Creates a new #GZlibCompressor.
*
* Returns: a new #GZlibCompressor
*
* Since: 2.24
**/
GZlibCompressor *
g_zlib_compressor_new (GZlibCompressorFormat format,
int level)
{
GZlibCompressor *compressor;
compressor = g_object_new (G_TYPE_ZLIB_COMPRESSOR,
"format", format,
"level", level,
NULL);
return compressor;
}
static void
g_zlib_compressor_reset (GConverter *converter)
{
GZlibCompressor *compressor = G_ZLIB_COMPRESSOR (converter);
int res;
res = deflateReset (&compressor->zstream);
if (res != Z_OK)
g_warning ("unexpected zlib error: %s\n", compressor->zstream.msg);
}
static GConverterResult
g_zlib_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)
{
GZlibCompressor *compressor;
int res;
int flush;
compressor = G_ZLIB_COMPRESSOR (converter);
compressor->zstream.next_in = (void *)inbuf;
compressor->zstream.avail_in = inbuf_size;
compressor->zstream.next_out = outbuf;
compressor->zstream.avail_out = outbuf_size;
flush = Z_NO_FLUSH;
if (flags & G_CONVERTER_INPUT_AT_END)
flush = Z_FINISH;
else if (flags & G_CONVERTER_FLUSH)
flush = Z_SYNC_FLUSH;
res = deflate (&compressor->zstream, flush);
if (res == Z_MEM_ERROR)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Not enough memory"));
return G_CONVERTER_ERROR;
}
if (res == Z_STREAM_ERROR)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Internal error: %s"), compressor->zstream.msg);
return G_CONVERTER_ERROR;
}
if (res == Z_BUF_ERROR)
{
if (flags & G_CONVERTER_FLUSH)
return G_CONVERTER_FLUSHED;
/* We do have output space, so this should only happen if we
have no input but need some */
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT,
_("Need more input"));
return G_CONVERTER_ERROR;
}
if (res == Z_OK || res == Z_STREAM_END)
{
*bytes_read = inbuf_size - compressor->zstream.avail_in;
*bytes_written = outbuf_size - compressor->zstream.avail_out;
if (res == Z_STREAM_END)
return G_CONVERTER_FINISHED;
return G_CONVERTER_CONVERTED;
}
g_assert_not_reached ();
}
static void
g_zlib_compressor_iface_init (GConverterIface *iface)
{
iface->convert = g_zlib_compressor_convert;
iface->reset = g_zlib_compressor_reset;
}
#define __G_ZLIB_COMPRESSOR_C__
#include "gioaliasdef.c"

51
gio/gzlibcompressor.h Normal file
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@ -0,0 +1,51 @@
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2009 Red Hat, Inc.
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#ifndef __G_ZLIB_COMPRESSOR_H__
#define __G_ZLIB_COMPRESSOR_H__
#include <gio/gconverter.h>
G_BEGIN_DECLS
#define G_TYPE_ZLIB_COMPRESSOR (g_zlib_compressor_get_type ())
#define G_ZLIB_COMPRESSOR(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_ZLIB_COMPRESSOR, GZlibCompressor))
#define G_ZLIB_COMPRESSOR_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_ZLIB_COMPRESSOR, GZlibCompressorClass))
#define G_IS_ZLIB_COMPRESSOR(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_ZLIB_COMPRESSOR))
#define G_IS_ZLIB_COMPRESSOR_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_ZLIB_COMPRESSOR))
#define G_ZLIB_COMPRESSOR_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_ZLIB_COMPRESSOR, GZlibCompressorClass))
typedef struct _GZlibCompressorClass GZlibCompressorClass;
struct _GZlibCompressorClass
{
GObjectClass parent_class;
};
GType g_zlib_compressor_get_type (void) G_GNUC_CONST;
GZlibCompressor *g_zlib_compressor_new (GZlibCompressorFormat format,
int level);
G_END_DECLS
#endif /* __G_ZLIB_COMPRESSOR_H__ */