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-rw-r--r--camel/camel-stream-buffer.c453
1 files changed, 0 insertions, 453 deletions
diff --git a/camel/camel-stream-buffer.c b/camel/camel-stream-buffer.c
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--- a/camel/camel-stream-buffer.c
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-/* -*- 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-1 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);
-}
-
-
-
-
-
-