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authorNotZed <NotZed@HelixCode.com>2000-03-01 08:06:05 +0800
committerMichael Zucci <zucchi@src.gnome.org>2000-03-01 08:06:05 +0800
commitb2a4e0b529a3139863ca39278e54056556f8c508 (patch)
tree55f286acc4e054a3a00be15dd3c0c5cb02be9cd3 /camel/camel-stream-buffer.c
parent2fa1ed250656c38c4ad72525dd13a030de4bf061 (diff)
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Added camel-stream-buffer to build.
2000-02-29 NotZed <NotZed@HelixCode.com> * Makefile.am (libcamelinclude_HEADERS): Added camel-stream-buffer to build. * camel-stream-buffer.[ch]: Generic buffer which can be applied to any stream. svn path=/trunk/; revision=1995
Diffstat (limited to 'camel/camel-stream-buffer.c')
-rw-r--r--camel/camel-stream-buffer.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/camel/camel-stream-buffer.c b/camel/camel-stream-buffer.c
new file mode 100644
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+++ b/camel/camel-stream-buffer.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/* camel-stream-buffer.c : Buffer any other other stream */
+
+/*
+ *
+ * Author :
+ * Michael Zucchi <notzed@helixcode.com>
+ *
+ * Copyright 1999, 2000 HelixCode (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-buffer.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "camel-log.h"
+
+static CamelStreamBufferClass *parent_class=NULL;
+
+enum {
+ BUF_USER = 1<<0, /* user-supplied buffer, do not free */
+};
+
+#define BUF_SIZE 1024
+
+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 void _finalize (GtkObject *object);
+static void _destroy (GtkObject *object);
+
+static void _init_vbuf(CamelStreamBuffer *sbf, CamelStream *s, CamelStreamBufferMode mode, char *buf, guint32 size);
+static void _init(CamelStreamBuffer *sbuf, CamelStream *s, CamelStreamBufferMode mode);
+
+static void
+camel_stream_buffer_class_init (CamelStreamBufferClass *camel_stream_buffer_class)
+{
+ CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_buffer_class);
+ GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_stream_buffer_class);
+
+ parent_class = gtk_type_class (camel_stream_get_type ());
+
+ /* virtual method definition */
+ camel_stream_buffer_class->init = _init;
+ camel_stream_buffer_class->init_vbuf = _init_vbuf;
+
+ /* 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;
+
+ gtk_object_class->finalize = _finalize;
+ gtk_object_class->destroy = _destroy;
+
+}
+
+static void
+camel_stream_buffer_init (gpointer object, gpointer klass)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (object);
+
+ sbf->flags = 0;
+ sbf->size = BUF_SIZE;
+ sbf->buf = g_malloc(BUF_SIZE);
+ sbf->ptr = sbf->buf;
+ sbf->end = sbf->buf;
+ sbf->mode = CAMEL_STREAM_BUFFER_READ | CAMEL_STREAM_BUFFER_BUFFER;
+ sbf->stream = 0;
+}
+
+GtkType
+camel_stream_buffer_get_type (void)
+{
+ static GtkType camel_stream_buffer_type = 0;
+
+ gdk_threads_enter ();
+ if (!camel_stream_buffer_type) {
+ GtkTypeInfo camel_stream_buffer_info =
+ {
+ "CamelStreamBuffer",
+ sizeof (CamelStreamBuffer),
+ sizeof (CamelStreamBufferClass),
+ (GtkClassInitFunc) camel_stream_buffer_class_init,
+ (GtkObjectInitFunc) camel_stream_buffer_init,
+ /* reserved_1 */ NULL,
+ /* reserved_2 */ NULL,
+ (GtkClassInitFunc) NULL,
+ };
+
+ camel_stream_buffer_type = gtk_type_unique (camel_stream_get_type (), &camel_stream_buffer_info);
+ }
+ gdk_threads_leave ();
+ return camel_stream_buffer_type;
+}
+
+
+static void
+_destroy (GtkObject *object)
+{
+ CamelStreamBuffer *stream_buffer = CAMEL_STREAM_BUFFER (object);
+
+ CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBuffer::destroy\n");
+
+ /* NOP to remove warnings */
+ stream_buffer->buf = stream_buffer->buf;
+
+
+ GTK_OBJECT_CLASS (parent_class)->destroy (object);
+
+ CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBuffer::destroy\n");
+}
+
+
+static void
+_finalize (GtkObject *object)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (object);
+
+
+ CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBuffer::finalize\n");
+
+ if (!(sbf->flags & BUF_USER)) {
+ g_free(sbf->buf);
+ }
+ if (sbf->stream)
+ gtk_object_unref(GTK_OBJECT(sbf->stream));
+
+ GTK_OBJECT_CLASS (parent_class)->finalize (object);
+ CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBuffer::finalize\n");
+}
+
+static void
+_set_vbuf(CamelStreamBuffer *sbf, char *buf, CamelStreamBufferMode mode, int size)
+{
+ if (sbf->buf && !(sbf->flags & BUF_USER)) {
+ g_free(sbf->buf);
+ }
+ if (buf) {
+ sbf->buf = buf;
+ sbf->flags |= BUF_USER;
+ } else {
+ sbf->buf = g_malloc(size);
+ sbf->flags &= ~BUF_USER;
+ }
+ sbf->size = size;
+ sbf->mode = mode;
+}
+
+static void
+_init_vbuf(CamelStreamBuffer *sbf, CamelStream *s, CamelStreamBufferMode mode, char *buf, guint32 size)
+{
+ _set_vbuf(sbf, buf, mode, size);
+ if (sbf->stream)
+ gtk_object_unref(GTK_OBJECT(sbf->stream));
+ sbf->stream = s;
+}
+
+static void
+_init(CamelStreamBuffer *sbuf, CamelStream *s, CamelStreamBufferMode mode)
+{
+ _init_vbuf(sbuf, s, mode, NULL, BUF_SIZE);
+}
+
+
+/**
+ * camel_stream_buffer_new:
+ * @stream: Existing stream to buffer.
+ * @mode: Operational mode of buffered stream.
+ *
+ * Create a new buffered stream of another stream. A default
+ * buffer size (1024 bytes), automatically managed will be used
+ * for buffering.
+ *
+ * See camel_stream_buffer_new_with_vbuf() for details on the
+ * @mode parameter.
+ *
+ * Return value: A newly created buffered stream.
+ **/
+CamelStream *
+camel_stream_buffer_new (CamelStream *stream, CamelStreamBufferMode mode)
+{
+ CamelStreamBuffer *sbf;
+ sbf = gtk_type_new (camel_stream_buffer_get_type ());
+ CAMEL_STREAM_BUFFER_CLASS (GTK_OBJECT(sbf)->klass)->init (sbf, stream, mode);
+
+ return CAMEL_STREAM (sbf);
+}
+
+/**
+ * camel_stream_buffer_new_with_vbuf:
+ * @stream: An existing stream to buffer.
+ * @mode: Mode to buffer in.
+ * @buf: Memory to use for buffering.
+ * @size: Size of buffer to use.
+ *
+ * Create a new stream which buffers another stream, @stream.
+ *
+ * The following values are available for @mode:
+ *
+ * CAMEL_STREAM_BUFFER_BUFFER, Buffer the input/output in blocks.
+ * CAMEL_STREAM_BUFFER_NEWLINE, Buffer on newlines (for output).
+ * CAMEL_STREAM_BUFFER_NONE, Perform no buffering.
+ *
+ * Note that currently this is ignored and CAMEL_STREAM_BUFFER_BUFFER
+ * is always used.
+ *
+ * In addition, one of the following mode options should be or'd
+ * together with the buffering mode:
+ *
+ * CAMEL_STREAM_BUFFER_WRITE, Buffer in write mode.
+ * CAMEL_STREAM_BUFFER_READ, Buffer in read mode.
+ *
+ * Buffering can only be done in one direction for any
+ * buffer instance.
+ *
+ * If @buf is non-NULL, then use the memory pointed to
+ * (for upto @size bytes) as the buffer for all buffering
+ * operations. It is upto the application to free this buffer.
+ * If @buf is NULL, then allocate and manage @size bytes
+ * for all buffering.
+ *
+ * Return value: A new stream with buffering applied.
+ **/
+CamelStream *camel_stream_buffer_new_with_vbuf (CamelStream *stream, CamelStreamBufferMode mode, char *buf, guint32 size)
+{
+ CamelStreamBuffer *sbf;
+ sbf = gtk_type_new (camel_stream_buffer_get_type ());
+ CAMEL_STREAM_BUFFER_CLASS (GTK_OBJECT(sbf)->klass)->init_vbuf (sbf, stream, mode, buf, size);
+
+ return CAMEL_STREAM (sbf);
+}
+
+/**
+ * _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)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
+ int bytes_read=1;
+ int bytes_left;
+ gchar *bptr = buffer;
+
+ g_return_val_if_fail( (sbf->mode & CAMEL_STREAM_BUFFER_MODE) == CAMEL_STREAM_BUFFER_READ, 0);
+
+ while (n && bytes_read>0) {
+ bytes_left = sbf->end - sbf->ptr;
+ if (bytes_left<n) {
+ if (bytes_left>0) {
+ memcpy(bptr, sbf->ptr, bytes_left);
+ n -= bytes_left;
+ bptr += bytes_left;
+ sbf->ptr += bytes_left;
+ }
+ /* if we are reading a lot, then read directly to the destination buffer */
+ if (n >= sbf->size/3) {
+ bytes_read = camel_stream_read(sbf->stream, bptr, n);
+ if (bytes_read>0) {
+ n -= bytes_read;
+ bptr += bytes_read;
+ }
+ } else {
+ bytes_read = camel_stream_read(sbf->stream, sbf->buf, sbf->size);
+ if (bytes_read>0) {
+ sbf->ptr = sbf->buf;
+ sbf->end = sbf->buf+bytes_read;
+ memcpy(bptr, sbf->ptr, n);
+ sbf->ptr += n;
+ bptr += n;
+ n -= bytes_read;
+ }
+ }
+ } else {
+ memcpy(bptr, sbf->ptr, bytes_left);
+ sbf->ptr += n;
+ bptr += n;
+ n = 0;
+ }
+ }
+
+ return bptr-buffer;
+}
+
+
+static gint
+_write (CamelStream *stream, const gchar *buffer, gint n)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
+ const gchar *bptr = buffer;
+ int bytes_written = 1;
+ int bytes_left;
+
+ g_return_val_if_fail( (sbf->mode & CAMEL_STREAM_BUFFER_MODE) == CAMEL_STREAM_BUFFER_WRITE, 0);
+
+ while (n && bytes_written > 0) {
+ bytes_left = sbf->size - (sbf->ptr-sbf->buf);
+ if (bytes_left<n) {
+ memcpy(sbf->ptr, bptr, bytes_left);
+ n -= bytes_left;
+ bptr += bytes_left;
+ bytes_written = camel_stream_write(sbf->stream, sbf->buf, sbf->size);
+ sbf->ptr = sbf->buf;
+ /* if we are writing a lot, write directly to the stream */
+ if (n >= sbf->size/3) {
+ bytes_written = camel_stream_write(sbf->stream, bptr, n);
+ bytes_written = n;
+ n -= bytes_written;
+ bptr += bytes_written;
+ } else {
+ memcpy(sbf->ptr, bptr, n);
+ sbf->ptr += n;
+ bptr += n;
+ n = 0;
+ }
+ } else {
+ memcpy(sbf->ptr, bptr, n);
+ sbf->ptr += n;
+ bptr += n;
+ n = 0;
+ }
+ }
+ return 0;
+}
+
+
+
+static void
+_flush (CamelStream *stream)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
+
+ if ((sbf->mode & CAMEL_STREAM_BUFFER_MODE) == CAMEL_STREAM_BUFFER_WRITE) {
+ int written = camel_stream_write(sbf->stream, sbf->buf, sbf->ptr-sbf->buf);
+ if (written > 0) {
+ sbf->ptr += written;
+ }
+ } else {
+ /* nothing to do for read mode 'flush' */
+ }
+
+ camel_stream_flush(sbf->stream);
+}
+
+
+
+static gint
+_available (CamelStream *stream)
+{
+ /* unimplemented */
+ return 0;
+}
+
+
+static gboolean
+_eos (CamelStream *stream)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
+
+ return camel_stream_eos(sbf->stream);
+}
+
+static void
+_close (CamelStream *stream)
+{
+ CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
+
+ _flush(stream);
+ camel_stream_close(sbf->stream);
+}
+
+/**
+ * camel_stream_buffer_gets:
+ * @sbf: A CamelStreamBuffer.
+ * @buf: Memory to write the string to.
+ * @max: Maxmimum number of characters to store.
+ *
+ * Read a line of characters up to the next newline character or
+ * @max characters.
+ *
+ * If the newline character is encountered, then it will be
+ * included in the buffer @buf. The buffer will be #NUL terminated.
+ *
+ * Return value: The number of characters read, or 0 for end of file or
+ * file error.
+ **/
+int camel_stream_buffer_gets(CamelStreamBuffer *sbf, char *buf, int max)
+{
+ register char *outptr, *inptr, *inend, c, *outend;
+ int bytes_read;
+
+ outptr = buf;
+ inptr = sbf->ptr;
+ inend = sbf->end;
+ outend = buf+max-1; /* room for NUL */
+
+ do {
+ while (inptr<inend && outptr<outend) {
+ c = *inptr++;
+ *outptr++ = c;
+ if (c=='\n') {
+ *outptr = 0;
+ sbf->ptr = inptr;
+ return outptr-buf;
+ }
+ }
+ if (outptr == outend)
+ break;
+
+ bytes_read = camel_stream_read(sbf->stream, sbf->buf, sbf->size);
+ if (bytes_read>0) {
+ inptr = sbf->ptr = sbf->buf;
+ inend = sbf->end = sbf->buf + bytes_read;
+ }
+ } while (bytes_read>0);
+
+ sbf->ptr = inptr;
+ if (outptr<=outend)
+ *outptr = 0;
+
+ return outptr-buf;
+}