/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-stream.c : abstract class for a stream */
/*
*
* Author :
* Bertrand Guiheneuf <bertrand@helixcode.com>
*
* Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <config.h>
#include "camel-stream.h"
enum {
DATA_AVAILABLE,
LAST_SIGNAL
};
static guint camel_stream_signals[LAST_SIGNAL] = { 0 };
static CamelObjectClass *parent_class = NULL;
/* Returns the class for a CamelStream */
#define CS_CLASS(so) CAMEL_STREAM_CLASS (GTK_OBJECT(so)->klass)
static void
default_camel_flush (CamelStream *stream)
{
/* nothing */
}
static gboolean
eos (CamelStream *stream)
{
return stream->eos;
}
static void
camel_stream_class_init (CamelStreamClass *camel_stream_class)
{
GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_stream_class);
parent_class = gtk_type_class (camel_object_get_type ());
/* virtual method definition */
camel_stream_class->read = NULL;
camel_stream_class->write = NULL;
camel_stream_class->flush = default_camel_flush;
camel_stream_class->eos = eos;
/* virtual method overload */
/* signal definition */
camel_stream_signals[DATA_AVAILABLE] =
gtk_signal_new ("data_available",
GTK_RUN_LAST,
gtk_object_class->type,
GTK_SIGNAL_OFFSET (CamelStreamClass, data_available),
gtk_marshal_NONE__NONE,
GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (gtk_object_class, camel_stream_signals, LAST_SIGNAL);
}
GtkType
camel_stream_get_type (void)
{
static GtkType camel_stream_type = 0;
if (!camel_stream_type) {
GtkTypeInfo camel_stream_info =
{
"CamelStream",
sizeof (CamelStream),
sizeof (CamelStreamClass),
(GtkClassInitFunc) camel_stream_class_init,
(GtkObjectInitFunc) NULL,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
camel_stream_type = gtk_type_unique (camel_object_get_type (), &camel_stream_info);
}
return camel_stream_type;
}
/**
* camel_stream_read:
* @stream: a CamelStream.
* @buffer: buffer where bytes pulled from the stream are stored.
* @n: max number of bytes to read.
*
* Read at most @n bytes from the @stream object and stores them
* in the buffer pointed at by @buffer.
*
* Return value: number of bytes actually read.
**/
gint
camel_stream_read (CamelStream *stream, gchar *buffer, gint n)
{
return CS_CLASS (stream)->read (stream, buffer, n);
}
/**
* camel_stream_write:
* @stream: a CamelStream object.
* @buffer: buffer to write.
* @n: number of bytes to write
*
* Write @n bytes from the buffer pointed at by @buffer into @stream.
*
* Return value: the number of bytes actually written
* in the stream.
**/
gint
camel_stream_write (CamelStream *stream, const gchar *buffer, gint n)
{
return CS_CLASS (stream)->write (stream, buffer, n);
}
/**
* camel_stream_flush:
* @stream: a CamelStream object
*
* Flushes the contents of the stream to its backing store.
**/
void
camel_stream_flush (CamelStream *stream)
{
CS_CLASS (stream)->flush (stream);
}
/**
* camel_stream_eos:
* @stream: a CamelStream object
*
* Test if there are bytes left to read on the @stream object.
*
* Return value: %TRUE if all the contents on the stream has been read, or
* %FALSE if information is still available.
**/
gboolean
camel_stream_eos (CamelStream *stream)
{
return CS_CLASS (stream)->eos (stream);
}
/**
* camel_stream_reset: reset a stream
* @stream: the stream object
*
* Reset a stream, that is put it in a state
* where it can be read from the begining.
* All streams in camel are not seekable,
* but they must all be resettable.
*
**/
void
camel_stream_reset (CamelStream *stream)
{
CS_CLASS (stream)->reset (stream);
}
/***************** Utility functions ********************/
/**
* came_stream_write_strings:
* @stream: a CamelStream object.
* @...: A %NULL terminated list of strings.
*
* This is a utility function that writes the list of
* strings into the @stream object.
*
* Returns number of successfully written bytes.
*/
int
camel_stream_write_strings (CamelStream *stream, ... )
{
va_list args;
const char *string;
int total = 0;
va_start(args, stream);
string = va_arg (args, const char *);
while (string) {
int ret = camel_stream_write_string (stream, string);
if (ret == -1)
return -1;
total += ret;
string = va_arg (args, char *);
}
va_end (args);
return total;
}
int camel_stream_printf (CamelStream *stream, const char *fmt, ... )
{
va_list args;
char *string;
int ret = 0;
va_start(args, fmt);
/* sigh, this allocates ... */
string = g_strdup_vprintf(fmt, args);
if (string) {
ret = camel_stream_write_string(stream, string);
g_free(string);
}
va_end(args);
return ret;
}
/**
* camel_stream_write_to_stream:
* @stream: Source CamelStream.
* @output_stream: Destination CamelStream.
*
* Write all of a stream (until eos) into another stream, in a blocking
* fashion.
*
* Return Value: Returns -1 on error, or the number of bytes succesfully
* copied across streams.
**/
int
camel_stream_write_to_stream (CamelStream *stream,
CamelStream *output_stream)
{
gchar tmp_buf[4096];
int total = 0;
gint nb_read;
gint nb_written;
/*
* default implementation that uses the input
* stream and stream it in a blocking way
* to an output stream.
*/
g_assert (output_stream);
g_assert (stream);
while (!camel_stream_eos (CAMEL_STREAM (stream))) {
nb_read = camel_stream_read (CAMEL_STREAM (stream), tmp_buf, 4096);
if (nb_read < 0)
return -1;
else if (nb_read>0) {
nb_written = 0;
while (nb_written < nb_read) {
int len = camel_stream_write (output_stream, tmp_buf + nb_written, nb_read - nb_written);
if (len<0)
return -1;
nb_written += len;
}
total += nb_written;
}
}
return total;
}
