/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ /* camel-stream-buffered-fs.c : file system based stream with buffer*/ /* * * Author : * Bertrand Guiheneuf * * Copyright 1999 International GNOME Support (http://www.gnome-support.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 #include "camel-stream-buffered-fs.h" #include #include #include #include #include "camel-log.h" static CamelStreamFsClass *parent_class=NULL; /* Returns the class for a CamelStreamBufferedFs */ #define CSBFS_CLASS(so) CAMEL_STREAM_BUFFERED_FS_CLASS (GTK_OBJECT(so)->klass) #define CSFS_CLASS(so) CAMEL_STREAM_FS_CLASS (GTK_OBJECT(so)->klass) #define CS_CLASS(so) CAMEL_STREAM_CLASS (GTK_OBJECT(so)->klass) static gint _read (CamelStream *stream, gchar *buffer, gint n); static gint _write (CamelStream *stream, const gchar *buffer, gint n); static void _flush (CamelStream *stream); static gint _available (CamelStream *stream); static gboolean _eos (CamelStream *stream); static void _close (CamelStream *stream); static gint _seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy); static void _finalize (GtkObject *object); static void _destroy (GtkObject *object); static void camel_stream_buffered_fs_class_init (CamelStreamBufferedFsClass *camel_stream_buffered_fs_class) { CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_buffered_fs_class); GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_stream_buffered_fs_class); parent_class = gtk_type_class (camel_stream_fs_get_type ()); /* virtual method definition */ /* virtual method overload */ camel_stream_class->read = _read; gtk_object_class->finalize = _finalize; gtk_object_class->destroy = _destroy; } static void camel_stream_buffered_fs_init (gpointer object, gpointer klass) { CamelStreamBufferedFs *stream = CAMEL_STREAM_BUFFERED_FS (object); stream->buffer_size = 200; stream->read_buffer = g_new (gchar, stream->buffer_size); stream->write_buffer = g_new (gchar, stream->buffer_size); stream->read_pos = 0; stream->read_pos_max = 0; stream->write_pos = 0; stream->write_pos_max = stream->buffer_size; } GtkType camel_stream_buffered_fs_get_type (void) { static GtkType camel_stream_buffered_fs_type = 0; gdk_threads_enter (); if (!camel_stream_buffered_fs_type) { GtkTypeInfo camel_stream_buffered_fs_info = { "CamelStreamBufferedFs", sizeof (CamelStreamBufferedFs), sizeof (CamelStreamBufferedFsClass), (GtkClassInitFunc) camel_stream_buffered_fs_class_init, (GtkObjectInitFunc) camel_stream_buffered_fs_init, /* reserved_1 */ NULL, /* reserved_2 */ NULL, (GtkClassInitFunc) NULL, }; camel_stream_buffered_fs_type = gtk_type_unique (camel_stream_fs_get_type (), &camel_stream_buffered_fs_info); } gdk_threads_leave (); return camel_stream_buffered_fs_type; } static void _destroy (GtkObject *object) { CamelStreamBufferedFs *stream_buffered_fs = CAMEL_STREAM_BUFFERED_FS (object); CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBufferedFs::destroy\n"); GTK_OBJECT_CLASS (parent_class)->destroy (object); CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBufferedFs::destroy\n"); } static void _finalize (GtkObject *object) { CamelStreamBufferedFs *stream_buffered_fs = CAMEL_STREAM_BUFFERED_FS (object); CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBufferedFs::finalize\n"); g_free (stream_buffered_fs->read_buffer); g_free (stream_buffered_fs->write_buffer); GTK_OBJECT_CLASS (parent_class)->finalize (object); CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBufferedFs::finalize\n"); } CamelStream * camel_stream_buffered_fs_new_with_name (const gchar *name, CamelStreamFsMode mode) { CamelStreamFs *stream_buffered_fs; stream_buffered_fs = gtk_type_new (camel_stream_buffered_fs_get_type ()); CSFS_CLASS (stream_buffered_fs)->init_with_name (stream_buffered_fs, name, mode); return CAMEL_STREAM (stream_buffered_fs); } CamelStream * camel_stream_buffered_fs_new_with_fd (int fd) { CamelStreamFs *stream_buffered_fs; CAMEL_LOG_FULL_DEBUG ( "Entering CamelStream::new_with_fd fd=%d\n",fd); stream_buffered_fs = gtk_type_new (camel_stream_buffered_fs_get_type ()); CSFS_CLASS (stream_buffered_fs)->init_with_fd (stream_buffered_fs, fd); return CAMEL_STREAM (stream_buffered_fs); } /** * _read: read bytes from a stream * @stream: stream * @buffer: buffer where bytes are stored * @n: max number of bytes to read * * * * Return value: number of bytes actually read. **/ static gint _read (CamelStream *stream, gchar *buffer, gint n) { CamelStreamBufferedFs *sbf = CAMEL_STREAM_BUFFERED_FS (stream); gint v; gint nb_bytes_buffered; gint nb_bytes_to_read = n; gint nb_bytes_read = 0; gint bytes_chunk; gboolean eof = FALSE; g_return_val_if_fail (n>0, n); nb_bytes_buffered = sbf->read_pos_max - sbf->read_pos; while ( (!eof) && (nb_bytes_to_read>0)) { if (nb_bytes_buffered <= 0) { /* have to read some data on disk */ v = CAMEL_STREAM_CLASS (parent_class)->read (stream, sbf->read_buffer, sbf->buffer_size); nb_bytes_buffered = v; sbf->read_pos_max = v; sbf->read_pos = 0; } /* nb of bytes to put inside buffer */ bytes_chunk = MIN (nb_bytes_buffered, nb_bytes_to_read); if (bytes_chunk > 0) { /* copy some bytes from the cache */ memcpy (buffer, sbf->read_buffer + sbf->read_pos, bytes_chunk); nb_bytes_buffered -= bytes_chunk; nb_bytes_to_read -= bytes_chunk; nb_bytes_read += bytes_chunk; sbf->read_pos += bytes_chunk; } else /* nb_bytes_to_read is >0 so if bytes_chunk is <0 * there was no data available */ eof = TRUE; } return nb_bytes_read; } static gint _write (CamelStream *stream, const gchar *buffer, gint n) { return 0; } static void _flush (CamelStream *stream) { } static gint _available (CamelStream *stream) { return 0; } static gboolean _eos (CamelStream *stream) { return FALSE; } static void _close (CamelStream *stream) { } static gint _seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy) { return 0; }