/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ /* camel-stream-mem.c : memory buffer based stream */ /* inspired by gnome-stream-mem.c in bonobo by Miguel de Icaza */ /* * * Author : * Bertrand Guiheneuf * * 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 #include "camel-stream-mem.h" #include #include #include #include #include "camel-log.h" static CamelStreamClass *parent_class=NULL; /* Returns the class for a CamelStreamMEM */ #define CSM_CLASS(so) CAMEL_STREAM_MEM_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 (CamelSeekableStream *stream, gint offset, CamelStreamSeekPolicy policy); static void _finalize (GtkObject *object); static void camel_stream_mem_class_init (CamelStreamMemClass *camel_stream_mem_class) { CamelSeekableStreamClass *camel_seekable_stream_class = CAMEL_SEEKABLE_STREAM_CLASS (camel_stream_mem_class); CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_mem_class); GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_stream_mem_class); parent_class = gtk_type_class (gtk_object_get_type ()); /* virtual method definition */ /* virtual method overload */ camel_stream_class->read = _read; camel_stream_class->write = _write; camel_stream_class->flush = _flush; camel_stream_class->available = _available; camel_stream_class->eos = _eos; camel_stream_class->close = _close; camel_seekable_stream_class->seek = _seek; gtk_object_class->finalize = _finalize; } static void camel_stream_mem_init (gpointer object, gpointer klass) { CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (object); camel_stream_mem->position = 0; } GtkType camel_stream_mem_get_type (void) { static GtkType camel_stream_mem_type = 0; if (!camel_stream_mem_type) { GtkTypeInfo camel_stream_mem_info = { "CamelStreamMem", sizeof (CamelStreamMem), sizeof (CamelStreamMemClass), (GtkClassInitFunc) camel_stream_mem_class_init, (GtkObjectInitFunc) camel_stream_mem_init, /* reserved_1 */ NULL, /* reserved_2 */ NULL, (GtkClassInitFunc) NULL, }; camel_stream_mem_type = gtk_type_unique (camel_seekable_stream_get_type (), &camel_stream_mem_info); } return camel_stream_mem_type; } CamelStream * camel_stream_mem_new (CamelStreamMemMode mode) { return camel_stream_mem_new_with_byte_array (g_byte_array_new (), mode); } CamelStream * camel_stream_mem_new_with_buffer (const char *buffer, unsigned int len, CamelStreamMemMode mode) { GByteArray *ba; ba = g_byte_array_new (); g_byte_array_append (ba, (const guint8 *)buffer, len); return camel_stream_mem_new_with_byte_array (ba, mode); } CamelStream * camel_stream_mem_new_with_byte_array (GByteArray *byte_array, CamelStreamMemMode mode) { CamelStreamMem *stream_mem; stream_mem = gtk_type_new (camel_stream_mem_get_type ()); stream_mem->mode = mode; stream_mem->buffer = byte_array; return CAMEL_STREAM (stream_mem); } static void _finalize (GtkObject *object) { CamelStreamMem *stream_mem = CAMEL_STREAM_MEM (object); if (stream_mem->buffer) g_byte_array_free (stream_mem->buffer, TRUE); GTK_OBJECT_CLASS (parent_class)->finalize (object); } /** * _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) { CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream); gint nb_bytes_to_read; g_assert (stream); nb_bytes_to_read = MIN (n, (camel_stream_mem->buffer)->len - camel_stream_mem->position); if (nb_bytes_to_read>0) { memcpy (buffer, (camel_stream_mem->buffer)->data + camel_stream_mem->position, nb_bytes_to_read); camel_stream_mem->position += nb_bytes_to_read; } else nb_bytes_to_read = -1; return nb_bytes_to_read; } /** * _write: read bytes to a stream * @stream: the stream * @buffer: byte buffer * @n: number of bytes to write * * * * Return value: the number of bytes actually written * in the stream. **/ static gint _write (CamelStream *stream, const gchar *buffer, gint n) { CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream); g_assert (stream); g_return_val_if_fail (camel_stream_mem->position>=0, -1); camel_stream_mem->buffer = g_byte_array_append (camel_stream_mem->buffer, (const guint8 *)buffer, n); camel_stream_mem->position += n; return n; } /** * _flush: flush pending changes * @stream: the stream * * **/ static void _flush (CamelStream *stream) { /* Nothing to do. */ return; } /** * _available: return the number of bytes available for reading * @stream: the stream * * Return the number of bytes available without blocking. * * Return value: the number of bytes available **/ static gint _available (CamelStream *stream) { CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream); return camel_stream_mem->buffer->len - camel_stream_mem->position; } /** * _eos: test if there are bytes left to read * @stream: the stream * * Return value: true if all stream has been read **/ static gboolean _eos (CamelStream *stream) { return _available (stream) == 0; } /** * _close: close a stream * @stream: the stream * * **/ static void _close (CamelStream *stream) { CamelStreamMem *stream_mem = CAMEL_STREAM_MEM (stream); if (stream_mem->buffer) g_byte_array_free (stream_mem->buffer, TRUE); stream_mem->buffer = NULL; } static gint _seek (CamelSeekableStream *stream, gint offset, CamelStreamSeekPolicy policy) { gint position; CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream); switch (policy) { case CAMEL_STREAM_SET: position = offset; break; case CAMEL_STREAM_CUR: position = camel_stream_mem->position + offset; break; case CAMEL_STREAM_END: position = (camel_stream_mem->buffer)->len + offset; break; default: return -1; } position = MIN (position, (camel_stream_mem->buffer)->len); position = MAX (position, 0); camel_stream_mem->position = position; return position; }