/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; fill-column: 160 -*- */
/* 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"
static CamelObjectClass *parent_class = NULL;
/* Returns the class for a CamelStream */
#define CS_CLASS(so) CAMEL_STREAM_CLASS(CAMEL_OBJECT_GET_CLASS(so))
/* default implementations, do very little */
static ssize_t stream_read (CamelStream *stream, char *buffer, size_t n) { return 0; }
static ssize_t stream_write (CamelStream *stream, const char *buffer, size_t n) { return n; }
static int stream_close (CamelStream *stream) { return 0; }
static int stream_flush (CamelStream *stream) { return 0; }
static gboolean stream_eos (CamelStream *stream) { return stream->eos; }
static int stream_reset (CamelStream *stream) { return 0; }
static void
camel_stream_class_init (CamelStreamClass *camel_stream_class)
{
parent_class = camel_type_get_global_classfuncs( CAMEL_OBJECT_TYPE );
/* virtual method definition */
camel_stream_class->read = stream_read;
camel_stream_class->write = stream_write;
camel_stream_class->close = stream_close;
camel_stream_class->flush = stream_flush;
camel_stream_class->eos = stream_eos;
camel_stream_class->reset = stream_reset;
}
CamelType
camel_stream_get_type (void)
{
static CamelType camel_stream_type = CAMEL_INVALID_TYPE;
if (camel_stream_type == CAMEL_INVALID_TYPE) {
camel_stream_type = camel_type_register( CAMEL_OBJECT_TYPE,
"CamelStream",
sizeof( CamelStream ),
sizeof( CamelStreamClass ),
(CamelObjectClassInitFunc) camel_stream_class_init,
NULL,
NULL,
NULL );
}
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, or -1 on error and
* set errno.
**/
ssize_t
camel_stream_read (CamelStream *stream, char *buffer, size_t n)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
g_return_val_if_fail (n == 0 || buffer, -1);
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 to the stream,
* or -1 on error.
**/
ssize_t
camel_stream_write (CamelStream *stream, const char *buffer, size_t n)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
g_return_val_if_fail (n == 0 || buffer, -1);
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. Only meaningful
* on writable streams.
*
* Return value: -1 on error.
**/
int
camel_stream_flush (CamelStream *stream)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
return CS_CLASS (stream)->flush (stream);
}
/**
* camel_stream_close:
* @stream:
*
* Close a stream.
*
* Return value: -1 on error.
**/
int
camel_stream_close (CamelStream *stream)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
return CS_CLASS (stream)->close (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)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), TRUE);
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 beginning again. Not all streams in Camel are seekable,
* but they must all be resettable.
*
* Return value: -1 on error.
**/
int
camel_stream_reset (CamelStream *stream)
{
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
return CS_CLASS (stream)->reset (stream);
}
/***************** Utility functions ********************/
/**
* camel_stream_write_string:
* @stream: a stream object
* @string: a string
*
* Writes the string to the stream.
*
* Return value: the number of characters output, -1 on error.
**/
ssize_t
camel_stream_write_string (CamelStream *stream, const char *string)
{
return camel_stream_write (stream, string, strlen (string));
}
/**
* camel_stream_printf:
* @stream: a stream object
* @fmt: a printf-style format string
*
* This printfs the given data to @stream.
*
* Return value: the number of characters output, -1 on error.
**/
ssize_t
camel_stream_printf (CamelStream *stream, const char *fmt, ... )
{
va_list args;
char *string;
ssize_t ret;
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
va_start (args, fmt);
string = g_strdup_vprintf (fmt, args);
va_end (args);
if (!string)
return -1;
ret = camel_stream_write (stream, string, strlen (string));
g_free (string);
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.
**/
ssize_t
camel_stream_write_to_stream (CamelStream *stream, CamelStream *output_stream)
{
char tmp_buf[4096];
ssize_t total = 0;
ssize_t nb_read;
ssize_t nb_written;
g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);
g_return_val_if_fail (CAMEL_IS_STREAM (output_stream), -1);
while (!camel_stream_eos (stream)) {
nb_read = camel_stream_read (stream, tmp_buf, sizeof (tmp_buf));
if (nb_read < 0)
return -1;
else if (nb_read > 0) {
nb_written = 0;
while (nb_written < nb_read) {
ssize_t 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;
}
