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gimp/libgimpbase/gimpwire.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* 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
* Library 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.
*/
#include "config.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef G_OS_WIN32
#include <process.h>
#include <io.h>
#endif
#include <glib.h>
#include "gimpwire.h"
typedef struct _WireHandler WireHandler;
struct _WireHandler
{
guint32 type;
WireReadFunc read_func;
WireWriteFunc write_func;
WireDestroyFunc destroy_func;
};
static void wire_init (void);
static guint wire_hash (guint32 *key);
static gboolean wire_compare (guint32 *a,
guint32 *b);
static GHashTable *wire_ht = NULL;
static WireIOFunc wire_read_func = NULL;
static WireIOFunc wire_write_func = NULL;
static WireFlushFunc wire_flush_func = NULL;
static gboolean wire_error_val = FALSE;
void
wire_register (guint32 type,
WireReadFunc read_func,
WireWriteFunc write_func,
WireDestroyFunc destroy_func)
{
WireHandler *handler;
if (!wire_ht)
wire_init ();
handler = g_hash_table_lookup (wire_ht, &type);
if (!handler)
handler = g_new (WireHandler, 1);
handler->type = type;
handler->read_func = read_func;
handler->write_func = write_func;
handler->destroy_func = destroy_func;
g_hash_table_insert (wire_ht, &handler->type, handler);
}
void
wire_set_reader (WireIOFunc read_func)
{
wire_read_func = read_func;
}
void
wire_set_writer (WireIOFunc write_func)
{
wire_write_func = write_func;
}
void
wire_set_flusher (WireFlushFunc flush_func)
{
wire_flush_func = flush_func;
}
gboolean
wire_read (GIOChannel *channel,
guint8 *buf,
gulong count)
{
if (wire_read_func)
{
if (!(* wire_read_func) (channel, buf, count))
{
g_warning ("%s: wire_read: error", g_get_prgname ());
wire_error_val = TRUE;
return FALSE;
}
}
else
{
GIOError error;
guint bytes;
while (count > 0)
{
do
{
bytes = 0;
error = g_io_channel_read (channel, (char*) buf, count, &bytes);
}
while ((error == G_IO_ERROR_AGAIN) ||
(error == G_IO_ERROR_UNKNOWN && errno == EINTR));
if (error != G_IO_ERROR_NONE)
{
g_warning ("%s: wire_read: error", g_get_prgname ());
wire_error_val = TRUE;
return FALSE;
}
if (bytes == 0)
{
g_warning ("%s: wire_read: unexpected EOF", g_get_prgname ());
wire_error_val = TRUE;
return FALSE;
}
count -= bytes;
buf += bytes;
}
}
return TRUE;
}
gboolean
wire_write (GIOChannel *channel,
guint8 *buf,
gulong count)
{
if (wire_write_func)
{
if (!(* wire_write_func) (channel, buf, count))
{
g_warning ("%s: wire_write: error", g_get_prgname ());
wire_error_val = TRUE;
return FALSE;
}
}
else
{
GIOError error;
guint bytes;
while (count > 0)
{
do
{
bytes = 0;
error = g_io_channel_write (channel, (char*) buf, count, &bytes);
}
while ((error == G_IO_ERROR_AGAIN) ||
(error == G_IO_ERROR_UNKNOWN && errno == EINTR));
if (error != G_IO_ERROR_NONE)
{
g_warning ("%s: wire_write: error", g_get_prgname ());
wire_error_val = TRUE;
return FALSE;
}
count -= bytes;
buf += bytes;
}
}
return TRUE;
}
gboolean
wire_flush (GIOChannel *channel)
{
if (wire_flush_func)
return (* wire_flush_func) (channel);
return FALSE;
}
gboolean
wire_error (void)
{
return wire_error_val;
}
void
wire_clear_error (void)
{
wire_error_val = FALSE;
}
gboolean
wire_read_msg (GIOChannel *channel,
WireMessage *msg)
{
WireHandler *handler;
if (wire_error_val)
return !wire_error_val;
if (!wire_read_int32 (channel, &msg->type, 1))
return FALSE;
handler = g_hash_table_lookup (wire_ht, &msg->type);
if (!handler)
g_error ("could not find handler for message: %d", msg->type);
(* handler->read_func) (channel, msg);
return !wire_error_val;
}
gboolean
wire_write_msg (GIOChannel *channel,
WireMessage *msg)
{
WireHandler *handler;
if (wire_error_val)
return !wire_error_val;
handler = g_hash_table_lookup (wire_ht, &msg->type);
if (!handler)
g_error ("could not find handler for message: %d", msg->type);
if (!wire_write_int32 (channel, &msg->type, 1))
return FALSE;
(* handler->write_func) (channel, msg);
return !wire_error_val;
}
void
wire_destroy (WireMessage *msg)
{
WireHandler *handler;
handler = g_hash_table_lookup (wire_ht, &msg->type);
if (!handler)
g_error ("could not find handler for message: %d\n", msg->type);
(* handler->destroy_func) (msg);
}
gboolean
wire_read_int32 (GIOChannel *channel,
guint32 *data,
gint count)
{
if (count > 0)
{
if (!wire_read_int8 (channel, (guint8*) data, count * 4))
return FALSE;
while (count--)
{
*data = g_ntohl (*data);
data++;
}
}
return TRUE;
}
gboolean
wire_read_int16 (GIOChannel *channel,
guint16 *data,
gint count)
{
if (count > 0)
{
if (!wire_read_int8 (channel, (guint8*) data, count * 2))
return FALSE;
while (count--)
{
*data = g_ntohs (*data);
data++;
}
}
return TRUE;
}
gboolean
wire_read_int8 (GIOChannel *channel,
guint8 *data,
gint count)
{
return wire_read (channel, data, count);
}
gboolean
wire_read_double (GIOChannel *channel,
gdouble *data,
gint count)
{
gchar *str;
gint i;
for (i = 0; i < count; i++)
{
if (!wire_read_string (channel, &str, 1))
return FALSE;
sscanf (str, "%le", &data[i]);
g_free (str);
}
return TRUE;
}
gboolean
wire_read_string (GIOChannel *channel,
gchar **data,
gint count)
{
guint32 tmp;
gint i;
for (i = 0; i < count; i++)
{
if (!wire_read_int32 (channel, &tmp, 1))
return FALSE;
if (tmp > 0)
{
data[i] = g_new (gchar, tmp);
if (!wire_read_int8 (channel, (guint8*) data[i], tmp))
{
g_free (data[i]);
return FALSE;
}
}
else
{
data[i] = NULL;
}
}
return TRUE;
}
gboolean
wire_write_int32 (GIOChannel *channel,
guint32 *data,
gint count)
{
guint32 tmp;
gint i;
if (count > 0)
{
for (i = 0; i < count; i++)
{
tmp = g_htonl (data[i]);
if (!wire_write_int8 (channel, (guint8*) &tmp, 4))
return FALSE;
}
}
return TRUE;
}
gboolean
wire_write_int16 (GIOChannel *channel,
guint16 *data,
gint count)
{
guint16 tmp;
gint i;
if (count > 0)
{
for (i = 0; i < count; i++)
{
tmp = g_htons (data[i]);
if (!wire_write_int8 (channel, (guint8*) &tmp, 2))
return FALSE;
}
}
return TRUE;
}
gboolean
wire_write_int8 (GIOChannel *channel,
guint8 *data,
gint count)
{
return wire_write (channel, data, count);
}
gboolean
wire_write_double (GIOChannel *channel,
gdouble *data,
gint count)
{
gchar *t;
gchar buf[128];
gint i;
t = buf;
for (i = 0; i < count; i++)
{
g_snprintf (buf, sizeof (buf), "%0.50e", data[i]);
if (!wire_write_string (channel, &t, 1))
return FALSE;
}
return TRUE;
}
gboolean
wire_write_string (GIOChannel *channel,
gchar **data,
gint count)
{
guint32 tmp;
gint i;
for (i = 0; i < count; i++)
{
if (data[i])
tmp = strlen (data[i]) + 1;
else
tmp = 0;
if (!wire_write_int32 (channel, &tmp, 1))
return FALSE;
if (tmp > 0)
if (!wire_write_int8 (channel, (guint8*) data[i], tmp))
return FALSE;
}
return TRUE;
}
static void
wire_init (void)
{
if (!wire_ht)
{
wire_ht = g_hash_table_new ((GHashFunc) wire_hash,
(GCompareFunc) wire_compare);
}
}
static guint
wire_hash (guint32 *key)
{
return *key;
}
static gboolean
wire_compare (guint32 *a,
guint32 *b)
{
return (*a == *b);
}
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