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gmime-stream-file.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.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 Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "gmime-stream-file.h"

static void g_mime_stream_file_class_init (GMimeStreamFileClass *klass);
static void g_mime_stream_file_init (GMimeStreamFile *stream, GMimeStreamFileClass *klass);
static void g_mime_stream_file_finalize (GObject *object);

static gssize stream_read (GMimeStream *stream, char *buf, size_t len);
static gssize stream_write (GMimeStream *stream, char *buf, size_t len);
static int stream_flush (GMimeStream *stream);
static int stream_close (GMimeStream *stream);
static gboolean stream_eos (GMimeStream *stream);
static int stream_reset (GMimeStream *stream);
static off_t stream_seek (GMimeStream *stream, off_t offset, GMimeSeekWhence whence);
static off_t stream_tell (GMimeStream *stream);
static gssize stream_length (GMimeStream *stream);
static GMimeStream *stream_substream (GMimeStream *stream, off_t start, off_t end);


static GMimeStreamClass *parent_class = NULL;


GType
g_mime_stream_file_get_type (void)
{
      static GType type = 0;
      
      if (!type) {
            static const GTypeInfo info = {
                  sizeof (GMimeStreamFileClass),
                  NULL, /* base_class_init */
                  NULL, /* base_class_finalize */
                  (GClassInitFunc) g_mime_stream_file_class_init,
                  NULL, /* class_finalize */
                  NULL, /* class_data */
                  sizeof (GMimeStreamFile),
                  16,   /* n_preallocs */
                  (GInstanceInitFunc) g_mime_stream_file_init,
            };
            
            type = g_type_register_static (GMIME_TYPE_STREAM, "GMimeStreamFile", &info, 0);
      }
      
      return type;
}


static void
g_mime_stream_file_class_init (GMimeStreamFileClass *klass)
{
      GMimeStreamClass *stream_class = GMIME_STREAM_CLASS (klass);
      GObjectClass *object_class = G_OBJECT_CLASS (klass);
      
      parent_class = g_type_class_ref (GMIME_TYPE_STREAM);
      
      object_class->finalize = g_mime_stream_file_finalize;
      
      stream_class->read = stream_read;
      stream_class->write = stream_write;
      stream_class->flush = stream_flush;
      stream_class->close = stream_close;
      stream_class->eos = stream_eos;
      stream_class->reset = stream_reset;
      stream_class->seek = stream_seek;
      stream_class->tell = stream_tell;
      stream_class->length = stream_length;
      stream_class->substream = stream_substream;
}

static void
g_mime_stream_file_init (GMimeStreamFile *stream, GMimeStreamFileClass *klass)
{
      stream->owner = TRUE;
      stream->fp = NULL;
}

static void
g_mime_stream_file_finalize (GObject *object)
{
      GMimeStreamFile *stream = (GMimeStreamFile *) object;
      
      if (stream->owner && stream->fp)
            fclose (stream->fp);
      
      G_OBJECT_CLASS (parent_class)->finalize (object);
}


static gssize
stream_read (GMimeStream *stream, char *buf, size_t len)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      gssize nread;
      
      if (stream->bound_end != -1 && stream->position >= stream->bound_end)
            return -1;
      
      if (stream->bound_end != -1)
            len = MIN (stream->bound_end - stream->position, len);
      
      /* make sure we are at the right position */
      fseek (fstream->fp, stream->position, SEEK_SET);
      
      nread = fread (buf, 1, len, fstream->fp);
      
      if (nread > 0)
            stream->position += nread;
      
      return nread;
}

static gssize
stream_write (GMimeStream *stream, char *buf, size_t len)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      gssize nwritten;
      
      if (stream->bound_end != -1 && stream->position >= stream->bound_end)
            return -1;
      
      if (stream->bound_end != -1)
            len = MIN (stream->bound_end - stream->position, len);
      
      /* make sure we are at the right position */
      fseek (fstream->fp, stream->position, SEEK_SET);
      
      nwritten = fwrite (buf, 1, len, fstream->fp);
      
      if (nwritten > 0)
            stream->position += nwritten;
      
      return nwritten;
}

static int
stream_flush (GMimeStream *stream)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      
      g_return_val_if_fail (fstream->fp != NULL, -1);
      
      return fflush (fstream->fp);
}

static int
stream_close (GMimeStream *stream)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      int ret;
      
      g_return_val_if_fail (fstream->fp != NULL, -1);
      
      ret = fclose (fstream->fp);
      if (ret != -1)
            fstream->fp = NULL;
      
      return ret;
}

static gboolean
stream_eos (GMimeStream *stream)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      
      g_return_val_if_fail (fstream->fp != NULL, TRUE);
      
      if (stream->bound_end == -1)
            return feof (fstream->fp) ? TRUE : FALSE;
      else
            return stream->position >= stream->bound_end;
}

static int
stream_reset (GMimeStream *stream)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      int ret;
      
      g_return_val_if_fail (fstream->fp != NULL, -1);
      
      if (stream->position == stream->bound_start)
            return 0;
      
      ret = fseek (fstream->fp, stream->bound_start, SEEK_SET);
      if (ret != -1)
            stream->position = stream->bound_start;
      
      return ret;
}

static off_t
stream_seek (GMimeStream *stream, off_t offset, GMimeSeekWhence whence)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      off_t real = stream->position;
      int ret;
      
      g_return_val_if_fail (fstream->fp != NULL, -1);
      
      switch (whence) {
      case GMIME_STREAM_SEEK_SET:
            real = offset;
            break;
      case GMIME_STREAM_SEEK_CUR:
            real = stream->position + offset;
            break;
      case GMIME_STREAM_SEEK_END:
            if (stream->bound_end == -1) {
                  fseek (fstream->fp, offset, SEEK_END);
                  real = ftell (fstream->fp);
                  if (real != -1) {
                        if (real < stream->bound_start)
                              real = stream->bound_start;
                        stream->position = real;
                  }
                  return real;
            }
            real = stream->bound_end + offset;
            break;
      }
      
      if (stream->bound_end != -1)
            real = MIN (real, stream->bound_end);
      real = MAX (real, stream->bound_start);
      
      ret = fseek (fstream->fp, real, SEEK_SET);
      if (ret == -1)
            return -1;
      
      stream->position = real;
      
      return real;
}

static off_t
stream_tell (GMimeStream *stream)
{
      return stream->position;
}

static gssize
stream_length (GMimeStream *stream)
{
      GMimeStreamFile *fstream = (GMimeStreamFile *) stream;
      off_t bound_end;
      
      if (stream->bound_start != -1 && stream->bound_end != -1)
            return stream->bound_end - stream->bound_start;
      
      fseek (fstream->fp, 0, SEEK_END);
      bound_end = ftell (fstream->fp);
      fseek (fstream->fp, stream->position, SEEK_SET);
      
      if (bound_end < stream->bound_start)
            return -1;
      
      return bound_end - stream->bound_start;
}

static GMimeStream *
stream_substream (GMimeStream *stream, off_t start, off_t end)
{
      GMimeStreamFile *fstream;
      
      fstream = g_object_new (GMIME_TYPE_STREAM_FILE, NULL, NULL);
      fstream->owner = FALSE;
      fstream->fp = GMIME_STREAM_FILE (stream)->fp;
      
      g_mime_stream_construct (GMIME_STREAM (fstream), start, end);
      
      return GMIME_STREAM (fstream);
}


/**
 * g_mime_stream_file_new:
 * @fp: file pointer
 *
 * Creates a new GMimeStreamFile object around @fp.
 *
 * Returns a stream using @fp.
 **/
GMimeStream *
g_mime_stream_file_new (FILE *fp)
{
      GMimeStreamFile *fstream;
      
      fstream = g_object_new (GMIME_TYPE_STREAM_FILE, NULL, NULL);
      fstream->owner = TRUE;
      fstream->fp = fp;
      
      g_mime_stream_construct (GMIME_STREAM (fstream), ftell (fp), -1);
      
      return GMIME_STREAM (fstream);
}


/**
 * g_mime_stream_file_new_with_bounds:
 * @fp: file pointer
 * @start: start boundary
 * @end: end boundary
 *
 * Creates a new GMimeStreamFile object around @fp with bounds @start
 * and @end.
 *
 * Returns a stream using @fp with bounds @start and @end.
 **/
GMimeStream *
g_mime_stream_file_new_with_bounds (FILE *fp, off_t start, off_t end)
{
      GMimeStreamFile *fstream;
      
      fstream = g_object_new (GMIME_TYPE_STREAM_FILE, NULL, NULL);
      fstream->owner = TRUE;
      fstream->fp = fp;
      
      g_mime_stream_construct (GMIME_STREAM (fstream), start, end);
      
      return GMIME_STREAM (fstream);
}

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