/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; fill-column: 160 -*- */
/* camel-stream-buffer.c : Buffer any other other stream
*
* Authors: Michael Zucchi <notzed@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-buffer.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
static CamelStreamClass *parent_class = NULL;
enum {
BUF_USER = 1<<0, /* user-supplied buffer, do not free */
};
#define BUF_SIZE 1024
static ssize_t stream_read (CamelStream *stream, char *buffer, size_t n);
static ssize_t stream_write (CamelStream *stream, const char *buffer, size_t n);
static int stream_flush (CamelStream *stream);
static int stream_close (CamelStream *stream);
static gboolean stream_eos (CamelStream *stream);
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);
parent_class = CAMEL_STREAM_CLASS (camel_type_get_global_classfuncs (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 = stream_read;
camel_stream_class->write = stream_write;
camel_stream_class->flush = stream_flush;
camel_stream_class->close = stream_close;
camel_stream_class->eos = stream_eos;
}
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;
sbf->linesize = 80;
sbf->linebuf = g_malloc(sbf->linesize);
}
static void
camel_stream_buffer_finalize (CamelObject *object)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (object);
if (!(sbf->flags & BUF_USER)) {
g_free(sbf->buf);
}
if (sbf->stream)
camel_object_unref(CAMEL_OBJECT(sbf->stream));
g_free(sbf->linebuf);
}
CamelType
camel_stream_buffer_get_type (void)
{
static CamelType camel_stream_buffer_type = CAMEL_INVALID_TYPE;
if (camel_stream_buffer_type == CAMEL_INVALID_TYPE) {
camel_stream_buffer_type = camel_type_register (camel_stream_get_type (), "CamelStreamBuffer",
sizeof (CamelStreamBuffer),
sizeof (CamelStreamBufferClass),
(CamelObjectClassInitFunc) camel_stream_buffer_class_init,
NULL,
(CamelObjectInitFunc) camel_stream_buffer_init,
(CamelObjectFinalizeFunc) camel_stream_buffer_finalize);
}
return camel_stream_buffer_type;
}
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)
camel_object_unref(CAMEL_OBJECT(sbf->stream));
sbf->stream = s;
camel_object_ref(CAMEL_OBJECT(sbf->stream));
}
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 = CAMEL_STREAM_BUFFER (camel_object_new (camel_stream_buffer_get_type ()));
CAMEL_STREAM_BUFFER_CLASS (CAMEL_OBJECT_GET_CLASS(sbf))->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 = CAMEL_STREAM_BUFFER (camel_object_new (camel_stream_buffer_get_type ()));
CAMEL_STREAM_BUFFER_CLASS (CAMEL_OBJECT_GET_CLASS(sbf))->init_vbuf (sbf, stream, mode, buf, size);
return CAMEL_STREAM (sbf);
}
static ssize_t
stream_read (CamelStream *stream, char *buffer, size_t n)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
ssize_t bytes_read = 1;
ssize_t bytes_left;
char *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) {
size_t bytes_used = bytes_read > n ? n : bytes_read;
sbf->ptr = sbf->buf;
sbf->end = sbf->buf+bytes_read;
memcpy(bptr, sbf->ptr, bytes_used);
sbf->ptr += bytes_used;
bptr += bytes_used;
n -= bytes_used;
}
}
} else {
memcpy(bptr, sbf->ptr, n);
sbf->ptr += n;
bptr += n;
n = 0;
}
}
return (ssize_t)(bptr - buffer);
}
static ssize_t
stream_write (CamelStream *stream, const char *buffer, size_t n)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
const char *bptr = buffer;
ssize_t bytes_written = 1;
ssize_t bytes_left;
ssize_t total = n;
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);
if (bytes_written >0) {
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;
}
}
if (bytes_written == -1)
return -1;
return total;
}
static int
stream_flush (CamelStream *stream)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
if ((sbf->mode & CAMEL_STREAM_BUFFER_MODE) == CAMEL_STREAM_BUFFER_WRITE) {
int len = sbf->ptr-sbf->buf;
int written = camel_stream_write(sbf->stream, sbf->buf, len);
if (written > 0)
sbf->ptr += written;
if (written != len)
return -1;
} else {
/* nothing to do for read mode 'flush' */
}
return camel_stream_flush(sbf->stream);
}
static int
stream_close (CamelStream *stream)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
if (stream_flush(stream) == -1)
return -1;
return camel_stream_close(sbf->stream);
}
static gboolean
stream_eos (CamelStream *stream)
{
CamelStreamBuffer *sbf = CAMEL_STREAM_BUFFER (stream);
return camel_stream_eos(sbf->stream) && sbf->ptr == sbf->end;
}
/**
* 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,
* and -1 on error.
**/
int camel_stream_buffer_gets(CamelStreamBuffer *sbf, char *buf, unsigned 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 == -1)
return -1;
inptr = sbf->ptr = sbf->buf;
inend = sbf->end = sbf->buf + bytes_read;
} while (bytes_read>0);
sbf->ptr = inptr;
*outptr = 0;
return (int)(outptr - buf);
}
/**
* camel_stream_buffer_read_line: read a complete line from the stream
* @sbf: A CamelStreamBuffer
*
* This function reads a complete newline-terminated line from the stream
* and returns it in allocated memory. The trailing newline (and carriage
* return if any) are not included in the returned string.
*
* Return value: the line read, which the caller must free when done with,
* or NULL on eof. If an error occurs, @ex will be set.
**/
char *
camel_stream_buffer_read_line (CamelStreamBuffer *sbf)
{
unsigned char *p;
int nread;
p = sbf->linebuf;
while (1) {
nread = camel_stream_buffer_gets (sbf, p, sbf->linesize - (p - sbf->linebuf));
if (nread <=0) {
if (p > sbf->linebuf)
break;
return NULL;
}
p += nread;
if (p[-1] == '\n')
break;
nread = p - sbf->linebuf;
sbf->linesize *= 2;
sbf->linebuf = g_realloc (sbf->linebuf, sbf->linesize);
p = sbf->linebuf + nread;
}
p--;
if (p[-1] == '\r')
p--;
p[0] = 0;
return g_strdup(sbf->linebuf);
}
